Publications (106)
Calibrating the absolute amplitude scale for air showers measured at LOFAR
A. Nelles, J. R. Hörandel, T. Karskens +74
Air showers induced by cosmic rays create nanosecond pulses detectable at radio frequencies. These pulses have been measured successfully in the past few years at the LOw Frequency…
HESS J1943+213: An Extreme Blazar Shining Through The Galactic Plane
The VERITAS Collaboration, A. Archer, W. Benbow +60
HESS J1943+213 is a very-high-energy (VHE; 100 GeV) -ray source in the direction of the Galactic Plane. Studies exploring the classification of the source are converging tow…
CHANG-ES XIII: Transport processes and the magnetic fields of NGC 4666 - indication of a reversing disk magnetic field
Y. Stein, R. -J. Dettmar, J. Irwin +10
We analyze the magnetic field geometry and the transport processes of the cosmic rays of the edge-on spiral starburst galaxy NGC 4666 from CHANG-ES radio continuum data in two freq…
Science with the Cherenkov Telescope Array
The Cherenkov Telescope Array Consortium, :, B. S. Acharya +580
The Cherenkov Telescope Array, CTA, will be the major global observatory for very high energy gamma-ray astronomy over the next decade and beyond. The scientific potential of CTA i…
Very Light Magnetized Jets on Large Scales - I. Evolution and Magnetic Fields
V. Gaibler, M. Krause, M. Camenzind
Magnetic fields, which are undoubtedly present in extragalactic jets and responsible for the observed synchrotron radiation, can affect the morphology and dynamics of the jets and…
A strong limit on the very-high-energy emission from GRB 150323A
A. U. Abeysekara, A. Archer, W. Benbow +63
On 2015 March 23, VERITAS responded to a -BAT detection of a gamma-ray burst, with observations beginning 270 seconds after the onset of BAT emission, and only 135 seconds a…
Gamma-ray observations of Tycho's SNR with VERITAS and Fermi
VERITAS Collaboration, S. Archambault, A. Archer +64
High-energy gamma-ray emission from supernova remnants (SNRs) has provided a unique perspective for studies of Galactic cosmic-ray acceleration. Tycho's SNR is a particularly good…
Cold dust in a selected sample of nearby galaxies. I. The interacting galaxy NGC4631
M. Dumke, M. Krause, R. Wielebinski
We have observed the continuum emission of the interacting galaxy NGC4631 at 0.87 and 1.23mm using the Heinrich-Hertz-Telescope on Mt. Graham and the IRAM 30-m telescope on Pico Ve…
How did globular clusters lose their gas?
C. Charbonnel, M. Krause, T. Decressin +3
We summarize the results presented in Krause et al. (2012) on the impact of supernova-driven shells and dark-remnant accretion on gas expulsion in globular cluster infancy.
Very-High-Energy -Ray Observations of the Blazar 1ES 2344+514 with VERITAS
C. Allen, S. Archambault, A. Archer +79
We present very-high-energy -ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2007 and…
Magnetic fields in the disk and halo of M51
E. M. Berkhuijsen, C. Horellou, M. Krause +4
We discuss the regular magnetic field in the galaxy M51 on the basis of a new interpretation of polarization angles observed at the wavelengths 2.8, 6.2, 18.0 and 20.5 cm. We found…
Exceptionally bright TeV flares from the binary LS I +61 303
VERITAS Collaboration, S. Archambault, A. Archer +86
The TeV binary system LS I +61 303 is known for its regular, non-thermal emission pattern which traces the orbital period of the compact object in its 26.5 day orbit around…
Two-Loop Corrections to the Neutral Higgs Boson Masses in the CP-Violating NMSSM
T. N. Dao, R. Gröber, M. Krause +2
We present our calculation of the two-loop corrections of to the neutral Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric extension of the S…
Very High Energy outburst of Markarian 501 in May 2009
E. Aliu, S. Archambault, A. Archer +108
The very high energy (VHE; E 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54938--54956), 2009, as part of an extensive multi-wavelength campaign f…
Gamma-ray Emission of 60Fe and 26Al Radioactivities in our Galaxy
W. Wang, T. Siegert, Z. G. Dai +7
The isotopes Fe and Al originate from massive stars and their supernovae, reflecting ongoing nucleosynthesis in the Galaxy. We studied the gamma-ray emission from the…
VERITAS contributions to the 36th International Cosmic Ray Conference
A. U. Abeysekara, A. Archer, W. Benbow +65
Compilation of papers presented by the VERITAS Collaboration at the 36th International Cosmic Ray Conference (ICRC), held July 24 through August 1, 2019 in Madison, Wisconsin.
VERITAS contributions to the 35th International Cosmic Ray Conference
A. U. Abeysekara, S. Archambault, A. Archer +63
Compilation of papers presented by the VERITAS Collaboration at the 35th International Cosmic Ray Conference (ICRC), held July 12 through July 20, 2017 in Busan, South Korea.
Gamma-ray Observations Under Bright Moonlight with VERITAS
S. Archambault, A. Archer, W. Benbow +62
Imaging atmospheric Cherenkov telescopes (IACTs) are equipped with sensitive photomultiplier tube (PMT) cameras. Exposure to high levels of background illumination degrades the eff…
TeV Gamma-ray Observations of The Galactic Center Ridge By VERITAS
A. Archer, W. Benbow, R. Bird +73
The Galactic Center Ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component as well…
Detecting cosmic rays with the LOFAR radio telescope
P. Schellart, A. Nelles, S. Buitink +102
The low frequency array (LOFAR), is the first radio telescope designed with the capability to measure radio emission from cosmic-ray induced air showers in parallel with interferom…
Cosmic rays and the magnetic field of the nearby starburst galaxy NGC 253
V. Heesen, R. -J. Dettmar, M. Krause +1
Using radio polarimetry we study the connection between the transport of cosmic rays (CR's), the three-dimensional magnetic field structure, and features of other ISM phases in the…
Pathway to the Square Kilometre Array - The German White Paper -
F. Aharonian, T. G. Arshakian, B. Allen +69
The Square Kilometre Array (SKA) is the most ambitious radio telescope ever planned. With a collecting area of about a square kilometre, the SKA will be far superior in sensitivity…
A Search for Brief Optical Flashes Associated with the SETI Target KIC 8462852
A. U. Abeysekara, S. Archambault, A. Archer +78
The F-type star KIC 8462852 has recently been identified as an exceptional target for SETI (search for extraterrestrial intelligence) observations. We describe an analysis methodol…
Gas dynamics of the central few parsec region of NGC 1068 fuelled by the evolving nuclear star cluster
M. Schartmann, A. Burkert, M. Krause +3
High resolution observations with the NIR adaptive optics integral field spectrograph SINFONI at the VLT proved the existence of massive and young nuclear star clusters in the cent…
Very High-Energy Gamma-Ray Follow-Up Program Using Neutrino Triggers from IceCube
IceCube Collaboration, M. G. Aartsen, K. Abraham +537
We describe and report the status of a neutrino-triggered program in IceCube that generates real-time alerts for gamma-ray follow-up observations by atmospheric-Cherenkov telescope…
VERITAS and Multiwavelength Observations of the BL Lacertae Object 1ES 1741+196
VERITAS Collaboration, A. U. Abeysekara, S. Archambault +85
We present results from multiwavelength observations of the BL Lacertae object 1ES 1741+196, including results in the very-high-energy -ray regime using the Very Energetic Radi…
CHANG-ES XIX: Galaxy NGC 4013 -- a diffusion-dominated radio halo with plane-parallel disk and vertical halo magnetic fields
Y. Stein, R. -J. Dettmar, M. Wezgowiec +9
Using the Continuum HAloes in Nearby Galaxies - an EVLA Survey (CHANG-ES) radio continuum data from the Karl G. Jansky Very Large Array (VLA) in two frequency bands (C-band, L-band…
Cherenkov Telescope Array Contributions to the 35th International Cosmic Ray Conference (ICRC2017)
F. Acero, B. S. Acharya, V. AcÃn Portella +1137
List of contributions from the Cherenkov Telescope Array Consortium presented at the 35th International Cosmic Ray Conference, July 12-20 2017, Busan, Korea.
A Search for Very High-Energy Gamma Rays from the Missing Link Binary Pulsar J1023+0038 with VERITAS
E. Aliu, S. Archambault, A. Archer +82
The binary millisecond radio pulsar PSR J1023+0038 exhibits many characteristics similar to the gamma-ray binary system PSR B1259--63/LS 2883, making it an ideal candidate for the…
Science Highlights from VERITAS
D. Staszak, A. U. Abeysekara, S. Archambault +88
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is a ground-based array located at the Fred Lawrence Whipple Observatory in southern Arizona and is one of the…
Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253 I. The distribution and transport of cosmic rays
V. Heesen, R. Beck, M. Krause +1
The diffusive and convective CR transport in NGC 253 from the disk into the halo is investigated using the local CR bulk speed. The connection between the CR transport and the gala…
Magnetic fields and ionized gas in nearby late type galaxies
K. T. Chyzy, D. J. Bomans, M. Krause +3
In order to analyze the importance of the star formation rate in generating and amplifying magnetic fields in the interstellar medium we obtained deep total power and polarization…
Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013
M. BalokoviÄ, D. Paneque, G. Madejski +305
We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, V…
A luminous and isolated gamma-ray flare from the blazar B2 1215+30
VERITAS Collaboration, A. U. Abeysekara, S. Archambault +84
B2 1215+30 is a BL Lac-type blazar that was first detected at TeV energies by the MAGIC atmospheric Cherenkov telescopes, and subsequently confirmed by the VERITAS observatory with…
Polarisation of mJy radio sources
J. M. Stil, A. R. Taylor, M. Krause +1
Predictions of the number of faint polarised radio sources that can be detected by SKA pathfinder telescopes and the SKA depend on the polarisation properties of radio sources with…
Impact of Electroweak Corrections on Neutral Higgs Boson Decays in Extended Higgs Sectors
M. Krause, M. Muhlleitner
Precision predictions play an important role in the search for indirect New Physics effects in the Higgs sector itself. For the electroweak (EW) corrections of the Higgs bosons in…
Search for Magnetically Broadened Cascade Emission From Blazars with VERITAS
VERITAS Collaboration, S. Archambault, A. Archer +53
We present a search for magnetically broadened gamma-ray emission around active galactic nuclei (AGN), using VERITAS observations of seven hard-spectrum blazars. A cascade process…
The Radio Spectral Energy Distribution and Star Formation Rate Calibration in Galaxies
F. S. Tabatabaei, E. Schinnerer, M. Krause +17
We study the spectral energy distribution (SED) of the radio continuum emission from the KINGFISH sample of nearby galaxies to understand the energetics and origin of this emission…
Reliability of astrophysical jet simulations in 2D: On inter-code reliability and numerical convergence
M. Krause, M. Camenzind
In the present paper, we examine the convergence behavior and inter-code reliability of astrophysical jet simulations in axial symmetry. We consider both, pure hydrodynamic jets an…
Measurement of the Iron Spectrum in Cosmic Rays by VERITAS
The VERITAS collaboration, A. Archer, W. Benbow +55
We present a new measurement of the energy spectrum of iron nuclei in cosmic rays from 20 to 500 TeV. The measurement makes use of a template-based analysis method, which, for the…
High-resolution radio continuum survey of M33 II. Thermal and nonthermal emission
F. S. Tabatabaei, R. Beck, E. Krügel +4
We determine the variation in the nonthermal radio spectral index in the nearby spiral galaxy M33 at a linear resolution of 360 pc. We separate the thermal and nonthermal component…
Modeling the total and polarized emission in evolving galaxies: "spotty" magnetic structures
T. G. Arshakian, R. Stepanov, R. Beck +2
Future radio observations with the SKA and its precursors will be sensitive to trace spiral galaxies and their magnetic field configurations up to redshift . We suggest…
The magnetic field along the jets of NGC 4258 as deduced from high frequency radio observations
M. Krause, A. L"ohr
We present 2.4" resolution, high sensitivity radio continuum observations of the nearby spiral galaxy NGC 4258 in total intensity and linear polarization obtained with the Very Lar…
Very-high-energy observations of the binaries V 404 Cyg and 4U 0115+634 during giant X-ray outbursts
A. Archer, W. Benbow, R. Bird +62
Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as . The low-mass X-ray binary V 404 Cyg an…
A Multi-Scale Study of IR and Radio Emission from M33
F. S. Tabatabaei, R. Beck, M. Krause +5
The origin of the tight radio--IR correlation in galaxies has not been fully understood. One reason is the uncertainty about which heating sources (stars or diffuse interstellar ra…
Evidence for proton acceleration up to TeV energies based on VERITAS and Fermi-LAT observations of the Cas A SNR
A. U. Abeysekara, A. Archer, W. Benbow +60
We present a study of -ray emission from the core-collapse supernova remnant Cas~A in the energy range from 0.1GeV to 10TeV. We used 65 hours of VERITAS data to cover 200 GeV -…
A Very High Energy -Ray Survey towards the Cygnus Region of the Galaxy
The VERITAS Collaboration, A. U. Abeysekara, A. Archer +68
We present results from deep observations towards the Cygnus region using 300 hours of very-high-energy (VHE) -ray data taken with the VERITAS Cherenkov telescope array and ove…
A multi-scale study of infrared and radio emission from Scd galaxy M33
F. S. Tabatabaei, R. Beck, M. Krause +9
We investigate the energy sources of the infrared (IR) emission and their relation to the radio continuum emission at various spatial scales within the Scd galaxy M33. We use the w…
Timing calibration and spectral cleaning of LOFAR time series data
A. Corstanje, S. Buitink, J. E. Enriquez +10
We describe a method for spectral cleaning and timing calibration of short voltage time series data from individual radio interferometer receivers. It makes use of the phase differ…
The shape of the radio wavefront of extensive air showers as measured with LOFAR
A. Corstanje, P. Schellart, A. Nelles +78
Extensive air showers, induced by high energy cosmic rays impinging on the Earth's atmosphere, produce radio emission that is measured with the LOFAR radio telescope. As the emissi…
Large-scale Propagation of Very Light Jets in Galaxy Clusters
V. Gaibler, M. Camenzind, M. Krause
We performed MHD simulations of very light bipolar jets with density contrasts down to 10^-4 in axisymmetry, which were injected into a medium of constant density and evolved up to…
Measurement of Cosmic-ray Electrons at TeV Energies by VERITAS
VERITAS Collaboration, A. Archer, W. Benbow +58
Cosmic-ray electrons and positrons (CREs) at GeV-TeV energies are a unique probe of our local Galactic neighborhood. CREs lose energy rapidly via synchrotron radiation and inverse-…
Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +290
We present an extensive study of the BL Lac object Mrk 501 based on a data set collected during the multi-instrument campaign spanning from 2009 March 15 to 2009 August 1 which inc…
Testing the magnetic field models of galaxies with the SKA
T. G. Arshakian, R. Stepanov, R. Beck +2
The future new-generation radio telescope SKA (Square Kilometre Array) and its precursors will provide a rapidly growing number of polarized radio sources. Hundred and thousands po…
Warped diffusive radio halo around the quiescent spiral edge-on galaxy NGC 4565
V. Heesen, L. Whitler, P. Schmidt +12
Cosmic rays play a pivotal role in launching galactic winds, particularly in quiescently star-forming galaxies where the hot gas alone is not sufficient to drive a wind. Except for…
Strong First Order Electroweak Phase Transition in the CP-Conserving 2HDM Revisited
P. Basler, M. Krause, M. Muhlleitner +2
The discovery of the Higgs boson by the LHC experiments ATLAS and CMS has marked a milestone for particle physics. Yet, there are still many open questions that cannot be answered…
CTA Contributions to the 34th International Cosmic Ray Conference (ICRC2015)
The CTA Consortium, :, A. Abchiche +1305
List of contributions from the CTA Consortium presented at the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands.
Exploring the magnetic fields in local and distant galaxies
T. G. Arshakian, R. Stepanov, R. Beck +3
(abridged) We investigate the possibility to recognize the magnetic field structures in nearby galaxies and to test the cosmological evolution of their large- and small-scale magne…
Origin of magnetic moments in defective TiO2 single crystals
Shengqiang Zhou, E. Cizmar, K. Potzger +7
In this paper we show that ferromagnetism can be induced in pure TiO2 single crystals by oxygen ion irradiation. By combining x-ray diffraction, Raman-scattering, and electron spin…
VERITAS observations of the BL Lac object TXS 0506+056
A. U. Abeysekara, A. Archer, W. Benbow +57
On 2017 September 22, the IceCube Neutrino Observatory reported the detection of the high-energy neutrino event \icnu, of potential astrophysical origin. It was soon determined tha…
High-resolution radio continuum survey of M33: III. Magnetic fields
F. S. Tabatabaei, M. Krause, A. Fletcher +1
Using the linearly polarized intensity and polarization angle data at 3.6, 6.2 and 20 cm, we determine variations of Faraday rotation and depolarization across the nearby galaxy M3…
LORA: A scintillator array for LOFAR to measure extensive air showers
S. Thoudam, S. Buitink, A. Corstanje +11
The measurement of the radio emission from extensive air showers, induced by high-energy cosmic rays is one of the key science projects of the LOFAR radio telescope. The LOfar Radb…
Contributions of the Cherenkov Telescope Array (CTA) to the 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2016)
The CTA Consortium, :, A. Abchiche +1387
List of contributions from the Cherenkov Telescope Array (CTA) Consortium presented at the 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2016), July 11-15,…
Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 50-year Period
The VERITAS Collaboration, A. U. Abeysekara, W. Benbow +212
We report on observations of the pulsar / Be star binary system PSR J2032+4127 / MT91 213 in the energy range between 100 GeV and 20 TeV with the VERITAS and MAGIC imaging atmosphe…
The extreme HBL behaviour of Markarian 501 during 2012
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +276
A multiwavelength campaign was organized to take place between March and July of 2012. Excellent temporal coverage was obtained with more than 25 instruments, including the MAGIC,…
M82 - A radio continuum and polarisation study II. Polarisation and rotation measures
B. Adebahr, M. Krause, U. Klein +2
The composition and morphology of the interstellar medium in starburst galaxies has been well investigated, but the magnetic field properties are still uncertain. The nearby starbu…
Gamma rays from the quasar PKS 1441+25: story of an escape
A. U. Abeysekara, S. Archambault, A. Archer +103
Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the Universe. The det…
VERITAS and Fermi-LAT observations of new HAWC sources
VERITAS Collaboration, A. U. Abeysekara, A. Archer +280
The HAWC (High Altitude Water Cherenkov) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100~GeV) gamma-ray sources based on 507 days of obs…
Multiwavelength follow-up of a rare IceCube neutrino multiplet
M. G. Aartsen, M. Ackermann, J. Adams +501
On February 17 2016, the IceCube real-time neutrino search identified, for the first time, three muon neutrino candidates arriving within 100 s of one another, consistent with comi…
Radio Observations of the Magnetic Fields in Galaxies
M. Krause
After a short introduction on how we get information of the magnetic fields from radio observations I discuss the results concerning the magnetic field structure in galaxies: Large…
Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout
A. Acharyya, I. Agudo, E. O. Angüner +467
The Cherenkov Telescope Array (CTA) is the major next-generation observatory for ground-based very-high-energy gamma-ray astronomy. It will improve the sensitivity of current groun…
The magnetic field structure in NGC 253 in presence of a galactic wind
V. Heesen, M. Krause, R. Beck +1
We present radio continuum polarimetry observations of the nearby edge-on galaxy NGC 253 which possesses a very bright radio halo. Using the vertical synchrotron emission profiles…
The role of massive stars in the turbulent infancy of Galactic globular clusters: Feedback on the intracluster medium, and detailed timeline
C. Charbonnel, M. Krause, T. Decressin +2
A major paradigm shift has recently revolutionized our picture of globular clusters (GC) that were long thought to be simple systems of coeval stars born out of homogeneous materia…
The Great Markarian 421 Flare of February 2010: Multiwavelength variability and correlation studies
A. U. Abeysekara, W. Benbow, R. Bird +256
We report on variability and correlation studies using multiwavelength observations of the blazar Mrk 421 during the month of February, 2010 when an extraordinary flare reaching a…
VERITAS detection of -ray flaring activity from the BL Lac object 1ES 1727+502 during bright moonlight observations
S. Archambault, A. Archer, M. Beilicke +80
During moonlit nights, observations with ground-based Cherenkov telescopes at very high energies (VHE, GeV) are constrained since the photomultiplier tubes (PMTs) in the te…
Discovery of very-high-energy emission from RGB J2243+203 and derivation of its redshift upper limit
A. U. Abeysekara, S. Archambault, A. Archer +67
Very-high-energy (VHE; 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 21 and 24…
Upper limits from five years of blazar observations with the VERITAS Cherenkov telescopes
S. Archambault, A. Archer, W. Benbow +78
Between the beginning of its full-scale scientific operations in 2007 and 2012, the VERITAS Cherenkov telescope array observed more than 130 blazars; of these, 26 were detected as…
A Detailed Study of the Radio--FIR Correlation in NGC6946 with Herschel-PACS/SPIRE from KINGFISH
F. S. Tabatabaei, E. Schinnerer, E. J. Murphy +22
We derive the distribution of the synchrotron spectral index across NGC6946 and investigate the correlation between the radio continuum (synchrotron) and far-infrared (FIR) emissio…
The sub-mm morphology of the interacting galaxy NGC 3627
M. Dumke, M. Krause, R. Beck +3
We present sub-mm continuum and heterodyne data of the interacting galaxy NGC 3627, obtained with the HHT and APEX. We find significant changes in the molecular line ratios over sm…
Measurement of the extragalactic background light spectral energy distribution with VERITAS
VERITAS collaboration, A. U. Abeysekara, A. Archer +59
The extragalactic background light (EBL), a diffuse photon field in the optical and infrared range, is a record of radiative processes over the Universe's history. Spectral measure…
M82 - A radio continuum and polarisation study I. Data reduction and cosmic ray propagation
B. Adebahr, M. Krause, U. Klein +3
The potential role of magnetic fields and cosmic ray propagation for feedback processes in the early Universe can be probed by studies of local starburst counterparts with an equiv…
Probing the Properties of the Pulsar Wind in the Gamma-Ray Binary HESS J0632+057 with NuSTAR and VERITAS Observations
A. Archer, W. Benbow, R. Bird +60
HESS J0632+057 is a gamma-ray binary composed of a compact object orbiting a Be star with a period of about days. Extensive X-ray and TeV gamma-ray observations have revealed…
Direct measurement of stellar angular diameters by the VERITAS Cherenkov Telescopes
W. Benbow, R. Bird, A. Brill +54
The angular size of a star is a critical factor in determining its basic properties. Direct measurement of stellar angular diameters is difficult: at interstellar distances stars a…
Investigation of the cosmic ray population and magnetic field strength in the halo of NGC 891
D. D. Mulcahy, A. Horneffer, R. Beck +24
Low-frequency radio continuum observations of edge-on galaxies are ideal to study cosmic-ray electrons (CREs) in halos via radio synchrotron emission and to measure magnetic field…
Gauge Dependences of Higher-Order Corrections to NMSSM Higgs Boson Masses and the Charged Higgs Decay
T. N. Dao, L. Fritz, M. Krause +2
In this paper we compute the electroweak corrections to the charged Higgs boson decay into a boson and a neutral Higgs boson in the CP-conserving NMSSM. We calculate the proces…
VVV-WIT-01: highly obscured classical nova or protostellar collision?
P. W. Lucas, D. Minniti, A. Kamble +18
A search of the first Data Release of the VISTA Variables in the Via Lactea (VVV) Survey discovered the exceptionally red transient VVV-WIT-01 (). It peaked before March…
Commissioning of the vacuum system of the KATRIN Main Spectrometer
M. Arenz, M. Babutzka, M. Bahr +147
The KATRIN experiment will probe the neutrino mass by measuring the beta-electron energy spectrum near the endpoint of tritium beta-decay. An integral energy analysis will be perfo…
VERITAS Collaboration Contributions to the 34th International Cosmic Ray Conference
The VERITAS Collaboration, A. U. Abeysekara, S. Archambault +90
Compilation of papers presented by the VERITAS Collaboration at the 34th International Cosmic Ray Conference (ICRC), held July 30 through August 6, 2015 in The Hague, The Netherlan…
Variations of the Radio Synchrotron Spectral Index in M33
F. S. Tabatabaei, R. Beck, E. Krügel +4
We determine the variation in the nonthermal radio spectral index in the nearby spiral galaxy M33. We separate the thermal and nonthermal components of the radio continuum emission…
Dark Matter Constraints from a Joint Analysis of Dwarf Spheroidal Galaxy Observations with VERITAS
VERITAS Collaboration, S. Archambault, A. Archer +69
We present constraints on the annihilation cross section of WIMP dark matter based on the joint statistical analysis of four dwarf galaxies with VERITAS. These results are derived…
The relation between magnetic and material arms in models for spiral galaxies
D. Moss, R. Beck, D. Sokoloff +3
Context. Observations of polarized radio emission show that large-scale (regular) magnetic fields in spiral galaxies are not axisymmetric, but generally stronger in interarm region…
[The Impact of Nuclear Star Formation on Gas Inflow to AGN
R. I. Davies, E. Hicks, M. Schartmann +8
Our adaptive optics observations of nearby AGN at spatial resolutions as small as 0.085arcsec show strong evidence for recent, but no longer active, nuclear star formation. We begi…
High resolution radio continuum survey of M33: I. The radio maps
F. S. Tabatabaei, M. Krause, R. Beck
We study the exponential scale length of total radio emission, the spectral index distribution, and the linear radio polarization in the Scd galaxy M33. Observations were carried o…
Radio haloes in nearby galaxies modelled with 1D cosmic-ray transport using SPINNAKER
V. Heesen, M. Krause, R. Beck +10
We present radio continuum maps of 12 nearby (), edge-on (), late-type spiral galaxies mostly at and 5 GHz, observed with the Australia Te…
Polarized radio emission from extensive air showers measured with LOFAR
P. Schellart, S. Buitink, A. Corstanje +10
We present LOFAR measurements of radio emission from extensive air showers. We find that this emission is strongly polarized, with a median degree of polarization of nearly ,…
Superposition of Quantum and Classical Rotational Motions in Sc2C2@C84 Fullerite
K. H. Michel, B. Verberck, M. Hulman +2
The superposition of the quantum rotational motion (tunneling) of the encapsulated Sc2C2 complex with the classical rotational motion of the surrounding C84 molecule in a powder cr…
Magnetism in the nearby galaxy M33
F. S. Tabatabaei, M. Krause, R. Beck +1
Using high-resolution data of the linearly polarized intensity and polarization angle at 3.6, 6.2, and 20 cm together with a 3-D model of the regular magnetic field, we study varia…
ewN2HDECAY - A program for the Calculation of Electroweak One-Loop Corrections to Higgs Decays in the Next-to-Minimal Two-Higgs-Doublet Model Including State-of-the-Art QCD Corrections
M. Krause, M. Mühlleitner
We present in this paper our new program package ewN2HDECAY for the calculation of the partial decay widths and branching ratios of the Higgs bosons of the Next-to-Minimal 2-Higgs…
CHANG-ES XXIII: Influence of a galactic wind in NGC 5775
G. H. Heald, V. Heesen, S. S. Sridhar +22
We present new radio continuum images of the edge-on starburst galaxy NGC 5775, from LOFAR (140 MHz) and the Karl G. Jansky Very Large Array CHANG-ES survey (1500 MHz). We trace th…
A decade of multi-wavelength observations of the TeV blazar 1ES 1215+303: Extreme shift of the synchrotron peak frequency and long-term optical-gamma-ray flux increase
Janeth Valverde, Deirdre Horan, Denis Bernard +86
Blazars are known for their variability on a wide range of timescales at all wavelengths. Most studies of TeV gamma-ray blazars focus on short timescales, especially during flares.…