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Pks 2123-463: a confirmed gamma-ray blazar at high redshift (Document No: 20140008330)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Finke, J. Blanchard, J. M. Kann, D. A. Rau, A. Edwards, P. G. DAmmando, F. Schady, P. Lovell, J. E. J. Ojha, R. Orienti, M. Foley, A. R. Greiner, J. Stevens, J. Kadler, M. |
| Copyright Year | 2012 |
| Description | The flat spectrum radio quasar (FSRQ) PKS 2123â463 was associated in the First Fermi-LAT source catalog with the gamma-ray source 1FGL J2126.1â4603, but when considering the full first two years of Fermi observations, no gamma-ray source at a position consistent with this FSRQ was detected, and thus PKS 2123â463 was not reported in the Second Fermi-LAT source catalog. On 2011 December 14 a gamma-ray source positionally consistent with PKS 2123â463 was detected in flaring activity by Fermi-LAT. This activity triggered radio-to-X-ray observations by the Swift, GROND, ATCA, Ceduna, and KAT-7 observatories. Results of the localization of the gamma-ray source over 41 months of Fermi-LAT operation are reported here in conjunction with the results of the analysis of radio, optical, UV and X-ray data collected soon after the gamma-ray flare. The strict spatial association with the lower energy counterpart together with a simultaneous increase of the activity in optical, UV, X-ray and gamma-ray bands led to a firm identification of the gamma-ray source with PKS 2123â463. A new photometric redshift has been estimated as z = 1.46 +/- 0.05 using GROND and Swift/UVOT observations, in rough agreement with the disputed spectroscopic redshift of z = 1.67. We fit the broadband spectral energy distribution with a synchrotron/external Compton model. We find that a thermal disk component is necessary to explain the optical/UV emis- sion detected by Swift/UVOT. This disk has a luminosity of 1.8x1046 erg sâ1, and a fit to the disk emission assuming a Schwarzschild (i.e., nonrotating) black hole gives a mass of 2 x 109 M(solar mass). This is the first black hole mass estimate for this source. |
| File Size | 281109 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140008330 |
| Archival Resource Key | ark:/13960/t43r5vk84 |
| Language | English |
| Publisher Date | 2012-01-01 |
| Access Restriction | Open |
| Subject Keyword | Gamma-ray Blazar Active Galactic Nuclei Pks 2123-463 Quasars Red Shift X Ray Spectroscopy Ultraviolet Spectroscopy Astronomical Spectroscopy Blazars Spectra Radio Observation X Ray Telescopes Gamma Rays Swift Observatory Optical Measurement X Rays Gamma Ray Telescopes Radio Spectroscopy Radio Telescopes Ultraviolet Telescopes Compton Effect Black Holes Astronomy Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
