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Discovery of an Extreme MeV Blazar with the Swift Burst Alert Telescope
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sambruna, Rita M. Markwardt, Craig B. Mushotzky, Richard F. Tueller, Jack Greenbelt Brandt, William N. Schneider, Donald P. Falcone, Abe D. Cucchiara, Antonio |
| Copyright Year | 2006 |
| Abstract | The Burst Alert Telescope (BAT) onboard Swift detected bright emission from 15–195 keV from the source SWIFT J0746.3+2548 (J0746 in the following), identified with the optically-faint (R ∼ 19), z=2.979 quasar SDSS J074625.87+244901.2. Here we present Swift and multiwavelength observations of this source. The X-ray emission from J0746 is variable on timescales of hours to weeks in 0.5–8 keV and of a few months in 15–195 keV, but there is no accompanying spectral variability in the 0.5–8 keV band. There is a suggestion that the BAT spectrum, initially very hard (photon index Γ ∼ 0.7), steepened to Γ ∼ 1.3 in a few months, together with a decrease of the 15–195 keV flux by a factor ∼ 2. The 0.5–8 keV continuum is well described by a power law with Γ ∼ 1.3, and spectral flattening below 1 keV. The latter can be described with a column density in excess of the Galactic value with intrinsic column density N z H ∼ 10 22 cm −2 , or with a flatter power law, implying a sharp (∆Γ > ∼ 1) break across 16 keV in the quasar's rest-frame. The Spectral Energy Distribution of J0746 is double-humped, with the first component peaking at IR wavelengths and the second component at MeV energies. These properties suggest that J0746 is a a blazar with high gamma-ray luminosity and low peak energy (MeV) stretching the blazar sequence to an extreme. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0603829v1.pdf |
| Alternate Webpage(s) | http://cds.cern.ch/record/939378/files/0603829.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Alert:Type:Point in time:^Patient:Nominal Batch file Burst error Energy, Physics Kiloelectronvolt Offset binary Photons Respiratory Burst Spatial decision support system Spatial variability Swift (programming language) Triune continuum paradigm wavelength |
| Content Type | Text |
| Resource Type | Article |
