تقرير
PKS 2123-463: a confirmed gamma-ray blazar at high redshift
| العنوان: | PKS 2123-463: a confirmed gamma-ray blazar at high redshift |
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| المؤلفون: | D'Ammando, F., Rau, A., Schady, P., Finke, J., Orienti, M., Greiner, J., Kann, D. A., Ojha, R., Foley, A. R., Stevens, J., Blanchard, J. M., Edwards, P. G., Kadler, M., Lovell, J. E. J. |
| سنة النشر: | 2012 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | The flat spectrum radio quasar (FSRQ) PKS 2123-463 was associated in the First Fermi-LAT source catalog with the gamma-ray source 1FGL J2126.1-4603, 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 2123-463 was not reported in the Second Fermi-LAT source catalog. On 2011 December 14 a gamma-ray source positionally consistent with PKS 2123-463 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 2123-463. 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 emission detected by Swift/UVOT. This disk has a luminosity of about 1.8x10^46 erg/s, and a fit to the disk emission assuming a Schwarzschild (i.e., nonrotating) black hole gives a mass of about 2x10^9 solar masses. This is the first black hole mass estimate for this source. Comment: 9 pages, 5 figures, 5 tables. Accepted for publication in MNRAS. arXiv admin note: text overlap with arXiv:1207.3092 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2012.22041.x |
| الوصول الحر: | http://arxiv.org/abs/1209.0479Test |
| رقم الانضمام: | edsarx.1209.0479 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1111/j.1365-2966.2012.22041.x |
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