2013A&A...557A..71R


Query : 2013A&A...557A..71R

2013A&A...557A..71R - Astronomy and Astrophysics, volume 557A, 71-71 (2013/9-1)

Constraining the location of rapid gamma-ray flares in the flat spectrum radio quasar 3C 273.

RANI B., LOTT B., KRICHBAUM T.P., FUHRMANN L. and ZENSUS J.A.

Abstract (from CDS):

We present a γ-ray photon flux and spectral variability study of the flat-spectrum radio quasar 3C 273 over a rapid flaring activity period between September 2009 to April 2010. Five major flares were observed in the source during this period. The most rapid flare observed in the source has a flux doubling time of 1.1 hr. The rapid γ-ray flares allow us to constrain the location and size of the γ-ray emission region in the source. The γγ-opacity constrains the Doppler factor δγ≥10 for the highest energy (15GeV) photon observed by the Fermi-Large Area Telescope (LAT). Causality arguments constrain the size of the emission region to 1.6x1015cm. The γ-ray spectra measured over this period show clear deviations from a simple power law with a break in the 1-2GeV energy range. We discuss possible explanations for the origin of the γ-ray spectral breaks. Our study suggests that the γ-ray emission region in 3C 273 is located within the broad line region (<1.6pc). The spectral behavior and temporal characteristics of the individual flares indicate the presence of multiple shock scenarios at the base of the jet.

Abstract Copyright:

Journal keyword(s): gamma rays: galaxies - galaxies: active - quasars: individual: 3C 273

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5555 1
2 [VV2006] J123932.7+044305 QSO 12 39 32.7561699576 +04 43 05.233934352   20.81 20.56 18.1   ~ 141 2
3 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2863 2
4 QSO J1512-0906 Bla 15 12 50.5330369584 -09 05 59.830296360   16.74 16.54     ~ 1223 1
5 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2661 2

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2022.05.22-20:14:19

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