A short hard X-ray flare from the blazar NRAO 530 observed by INTEGRAL

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 $\times$ 10-10 erg c...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2006-04, Vol.450 (1), p.77-81
Main Authors: Foschini, L., Pian, E., Maraschi, L., Raiteri, C. M., Tavecchio, F., Ghisellini, G., Tosti, G., Malaguti, G., Di Cocco, G.
Format: Article
Language:English
Subjects:
galaxies: quasars: general
galaxies: quasars: individual: NRAO 530
X-rays: galaxies
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Summary: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 $\times$ 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.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20064804