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43 papers · 2 filters
A New Microquasar Candidate in M83
Roberto Soria, William P. Blair, Knox S. Long +2
Microquasars are neutron star or black hole X-ray binaries with jets. These jets can create shock-ionized bubbles of hot plasma that can masquerade as peculiar supernova remnants (…
GRB 190114C in the nuclear region of an interacting galaxy -- A detailed host analysis using ALMA, HST and VLT
A. de Ugarte Postigo, C. C. Thöne, S. Martın +28
GRB 190114C is the first GRB for which the detection of very-high energy emission up to the TeV range has been reported. It is still unclear whether environmental properties might…
NuSTAR Uncovers an Extremely Local Compton-thick AGN in NGC 4968
Stephanie M. LaMassa, Tahir Yaqoob, Peter G. Boorman +5
We present the analysis of Chandra and NuSTAR spectra of NGC 4968, a local (D44 Mpc) 12m-selected Seyfert 2 galaxy, enshrouded within Compton-thick layers of obscuring gas…
Incoherent fast variability of X-ray obscurers. The case of NGC 3783
B. De Marco, T. P. Adhikari, G. Ponti +22
Context. Obscuration events caused by outflowing clumps or streams of high column density, low ionisation gas, heavily absorbing the X-ray continuum, have been witnessed in a numbe…
The late-time radio behavior of GRB afterglows: testing the standard model
Tuomas Kangas, Andrew Fruchter
We examine a sample of 21 gamma-ray burst (GRB) afterglow light curves at radio frequencies, and compare them to the X-ray and/or optical properties of the afterglows and to the pr…
GRB 180620A: Evidence for late-time energy injection
Rosa L. Becerra, Fabio De Colle, Alan M. Watson +11
The early optical emission of gamma-ray bursts gives an opportunity to understand the central engine and first stages of these events. About 30\% of GRBs present flares whose origi…