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Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013
M. Baloković, 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…
Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +246
The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5 σ using the MAGIC telescopes. Together with the…
Multiwavelength study of RX J2015.6+3711: a magnetic cataclysmic variable with a 2-hr spin period
Francesco Coti Zelati, Nanda Rea, Sergio Campana +4
The X-ray source RX J2015.6+3711 was discovered by ROSAT in 1996 and recently proposed to be a cataclysmic variable (CV). Here we report on an XMM-Newton observation of RX J2015.6+…
VHE gamma-ray observations of transient and variable stellar objects with the MAGIC Telescopes
A. Fernández-Barral, O. Blanch, E. de Oña Wilhelmi +6
Galactic transients, X-ray and gamma-ray binaries provide a proper environment for particle acceleration. This leads to the production of gamma rays with energies reaching the GeV-…
Teraelectronvolt pulsed emission from the Crab pulsar detected by MAGIC
MAGIC Collaboration, S. Ansoldi, L. A. Antonelli +139
Aims: To investigate the extension of the very-high-energy spectral tail of the Crab pulsar at energies above 400 GeV. Methods: We analyzed 320 hours of good quality data of…
First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
A. Furniss, K. Noda, S. Boggs +273
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including the first detailed characterization of the s…
Gamma-ray flare activity from PSR B1259-63 during 2014 periastron passage and comparison to its 2010 passage
G. A. Caliandro, C. C. Cheung, J. Li +4
PSR B1259-63/LS 2883 is a gamma-ray binary system containing a radio pulsar in a highly elliptical ~3.4-year orbit around a Be star. In its 2010 periastron passage, multiwavelength…
Multi-wavelength observations of the transitional millisecond pulsar binary XSSJ12270-4859
Domitilla de Martino, Alessandro Papitto, Tomaso Belloni +7
We present an analysis of X-ray, Ultraviolet and optical/near-IR photometric data of the transitional millisecond pulsar binary XSSJ12270-4859, obtained at different epochs after t…
Deep view of the Large Magellanic Cloud with 6 years of Fermi-LAT observations
LAT Collaboration
The nearby Large Magellanic Cloud (LMC) provides a rare opportunity of a spatially resolved view of an external star-forming galaxy in gamma-rays. The LMC was detected at 0.1-100Ge…
Very-high-energy γ-ray observations of novae and dwarf novae with the MAGIC telescopes
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +148
Context. In the last five years the Fermi Large Area Telescope (LAT) instrument detected GeV γ-ray emission from five novae. The GeV emission can be interpreted in terms of an inve…
Multi-wavelength Observations of the Binary System PSR B1259-63/LS~2883 around the 2014 Periastron Passage
M. Chernyakova, A. Neronov, B. van Soelen +16
We report on the results of the extensive multi-wavelength campaign from optical to GeV gamma-rays of the 2014 periastron passage of PSR B1259-63, which is a unique high-mass gamma…
A systematic synchro-curvature modelling of pulsar -ray spectra unveils hidden trends
Daniele Viganò, Diego F. Torres, Jonatan Martín
-ray radiation from pulsars is usually thought to be mostly produced by the synchro-curvature losses of accelerated particles. Here we present a systematic study of all currentl…
Updated Search for Spectral Lines from Galactic Dark Matter Interactions with Pass 8 Data from the Fermi Large Area Telescope
LAT Collaboration
Dark matter in the Milky Way may annihilate directly into gamma rays, producing a monoenergetic spectral line. Therefore, detecting such a signature would be strong evidence for da…
Diagnosing the burst influence upon accretion in the clocked burster GS 1826--238
Long Ji, Shu Zhang, YuPeng Chen +6
Type-I X-ray bursts on the surface of a neutron star are a unique probe to the accretion in X-ray binary systems. However, we know little about the feedback of the burst emission u…
MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524
MAGIC Collaboration, J. Aleksić, S. Ansoldi +152
The high-frequency-peaked BL Lac (HBL) 1ES 0806+524 (z = 0.138) was discovered in VHE rays in 2008. Until now, the broad-band spectrum of 1ES 0806+524 has been only poorly char…
A propeller model for the sub-luminous disk state of the transitional millisecond pulsar PSR J1023+0038
A. Papitto, D. F. Torres
The discovery of millisecond pulsars switching between states powered either by the rotation of their magnetic field or by the accretion of matter, has recently proved the tight li…
High energy -ray emission from PSR B125963 during 2014 and 2010 periastron passages
G. Andrea Caliandro, C. C. Teddy Cheung, Jian Li +2
PSR B125963/SS 2883 is a -ray binary system composed of a radio pulsar in a long (1236.7 days) and elliptical () orbit around a Be star. In its 2010 periastron pas…
Modeling of the gamma-ray pulsed spectra of Geminga, Crab, and Vela with synchro-curvature radiation
Daniele Viganò, Diego F. Torres
-ray spectra of pulsars have been mostly studied in a phenomenological way, by fitting them to a cut-off power-law function. Here, we analyze a model where pulsed emission comes…
MAGIC observations of MWC 656, the only known Be/BH system
J. Aleksić, S. Ansoldi, L. A. Antonelli +149
Context: MWC 656 has recently been established as the first observationally detected high-mass X-ray binary system containing a Be star and a black hole (BH). The system has been a…