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15 papers · 2 filters
VHE gamma-ray detection of FSRQ QSO B1420+326 and modeling of its enhanced broadband state in 2020
V. A. Acciari, S. Ansoldi, L. A. Antonelli +230
Context. QSO B1420+326 is a blazar classified as a Flat Spectrum Radio Quasar (FSRQ). In the beginning of 2020 it underwent an enhanced flux state. An extensive multiwavelength cam…
MAGIC observations of the nearby short gamma-ray burst GRB 160821B
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +188
The coincident detection of GW170817 in gravitational waves and electromagnetic radiation spanning the radio to MeV gamma-ray bands provided the first direct evidence that short ga…
Swift-XRT follow-up of gravitational wave triggers during the third aLIGO/Virgo observing run
K. L. Page, P. A. Evans, A. Tohuvavohu +41
The Neil Gehrels Swift Observatory followed up 18 gravitational wave (GW) triggers from the LIGO/Virgo collaboration during the O3 observing run in 2019/2020, performing approximat…
The X-ray Background Emission of the Galactic Center and Bulge with NuSTAR
Ekaterina Kuznetsova, Roman Krivonos, Kerstin Perez +1
The Galactic diffuse X-ray emission (GDXE) is believed to arise from unresolved populations of numerous low-luminosity X-ray binary systems that trace stellar mass distribution of…
PTF11rka: an interacting supernova at the crossroads of stripped-envelope and H-poor super-luminous stellar core collapses
Elena Pian, Paolo A. Mazzali, Takashi J. Moriya +17
The hydrogen-poor supernova PTF11rka (z = 0.0744), reported by the Palomar Transient Factory, was observed with various telescopes starting a few days after the estimated explosion…
Asymmetric mass ratios for bright double neutron-star mergers
R. D. Ferdman, P. C. C. Freire, B. B. P. Perera +11
The discovery of a radioactively powered kilonova associated with the binary neutron star merger GW170817 was the first - and still only - confirmed electromagnetic counterpart to…
Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-High Energy Cosmic Rays
Telescope Array Collaboration, R. U. Abbasi, M. Abe +140
Evidence for a large-scale supergalactic cosmic ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high energy cosmic ray (UHECR) energies ab…
Enhanced optical activity 12 days before X-ray activity, and a 4 day X-ray delay during outburst rise, in a low-mass X-ray binary
A. J. Goodwin, D. M. Russell, D. K. Galloway +12
X-ray transients, such as accreting neutron stars, periodically undergo outbursts, thought to be caused by a thermal-viscous instability in the accretion disk. Usually outbursts of…
The binary evolution of SAX J1808.4-3658: Implications of an evolved donor star
A. J. Goodwin, T. E. Woods
Observations of the accretion powered millisecond pulsar SAX J1808.4-3658 have revealed an interesting binary evolution, with the orbit of the system expanding at an accelerated ra…
PSR J1012+5307: a millisecond pulsar with an extremely low-mass white dwarf companion
D. Mata Sánchez, A. G. Istrate, M. H. van Kerkwijk +2
Binaries harbouring millisecond pulsars enable a unique path to determine neutron star masses: radio pulsations reveal the motion of the neutron star, while that of the companion c…
High-energy characteristics of the accretion-powered millisecond pulsar IGR J17591-2342 during its 2018 outburst
L. Kuiper, S. S. Tsygankov, M. Falanga +4
IGR J17591-2342 is a recently INTEGRAL discovered accreting millisecond X-ray pulsar that went into outburst around July 21, 2018. To better understand the physics acting in these…
Unravelling the complex behavior of Mrk 421 with simultaneous X-ray and VHE observations during an extreme flaring activity in April 2013
MAGIC collaboration, V. A. Acciari, S. Ansoldi +237
We report on a multi-band variability and correlation study of the TeV blazar Mrk 421 during an exceptional flaring activity observed from 2013 April 11 to 2013 April 19. The study…
VERITAS Detection of LS 5039 and HESS J1825-137
VERITAS Collaboration, A. U. Abeysekara, W. Benbow +42
With 8 hours of observations, VERITAS confirms the detection of two very high energy gamma-ray sources. The gamma-ray binary LS 5039 is detected with a statistical significance of…
Striped Blandford/Znajek jets from advection of small scale magnetic field
J. F. Mahlmann, A. Levinson, M. A. Aloy
Black hole - accretion disc systems are the central engines of relativistic jets from stellar to galactic scales. We numerically quantify the unsteady outgoing Poynting flux throug…
Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +188
M87 is one of the closest (z=0.00436) extragalactic sources emitting at very-high-energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emi…