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The Unusual Weak-Line Quasar PG1407+265 and its Foreground z~0.7 X-ray Cluster
Jonathan C. McDowell, Aneta Siemiginowska, Matthew Ashby +2
We present new observations of the odd weak-line quasar PG1407+265, and report the discovery of CXOU J140927.9+261813, a X-ray cluster. Archival X-ray photometry…
Disentangling the AGN and Star-Formation Contributions to the Radio-X-ray Emission of Radio-Loud Quasars at 1<z<2
Mojegan Azadi, Belinda Wilkes, Joanna Kuraszkiewicz +12
We constrain the emission mechanisms responsible for the prodigious electromagnetic output generated by active galactic nuclei (AGN) and their host galaxies with a novel state-of-t…
Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares
G. G. Fazio, J. L. Hora, G. Witzel +13
Sgr A*, the supermassive black hole (SMBH) at the center of our Milky Way Galaxy, is known to be a variable source of X-ray, near-infrared (NIR), and submillimeter (submm) radiatio…
Variability Timescale and Spectral Index of Sgr A* in the Near Infrared: Approximate Bayesian Computation Analysis of the Variability of the Closest Supermassive Black Hole
G. Witzel, G. Martinez, J. Hora +16
Sagittarius A* (Sgr A*) is the variable radio, near-infrared (NIR), and X-ray source associated with accretion onto the Galactic center black hole. We present an analysis of the mo…
Spitzer/IRAC Observations of the Variability of Sgr A* and the Object G2 at 4.5 microns
J. L. Hora, G. Witzel, M. L. N. Ashby +9
We present the first detection from the Spitzer Space Telescope of 4.5 micron variability from Sgr A*, the emitting source associated with the Milky Way's central black hole. The >…