A Short Hard X-ray Flare from the Blazar NRAO 530 Observed by INTEGRAL

Details A Short Hard X-ray Flare from the Blazar NRAO 530 Observed by INTEGRAL A Short Hard X-ray Flare from the Blazar NRAO 530 Observed by INTEGRAL

2006-01-05

arxiv.org/abs/astro-ph/0601101v2

A&A, 450, (2006), 77

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures. Accepted for publication on A&A Main Journal. Note added in proof

Scientific paper

10.1051/0004-6361:20064804

We report about a short flare from the blazar NRAO 530 occurred on 17 February 2004 and detected serendipitously by the IBIS/ISGRI detector on board INTEGRAL. In the 20-40 keV energy range, the source, that is otherwise below the detection limit, is detected at a level of ~2 x 10^-10 erg cm^-2 s^-1 during a time interval of less than 2000 s, which is about a factor 2 above the detection threshold. At other wavelengths, only nearly-simultaneous radio data are available (1 observation at 2 cm on 11 February 2004), indicating a moderate increase of the polarization. This appears to be the shortest time variability episode ever detected in a high luminosity blazar at hard X-rays, unless the blazar is contaminated by the presence of an unknown unresolved rapidly varying source.

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