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

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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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2006-04, Vol.450 (1), p.77-81
Hauptverfasser: Foschini, L., Pian, E., Maraschi, L., Raiteri, C. M., Tavecchio, F., Ghisellini, G., Tosti, G., Malaguti, G., Di Cocco, G.
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galaxies: quasars: general
galaxies: quasars: individual: NRAO 530
X-rays: galaxies
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container_end_page 81
container_issue 1
container_start_page 77
container_title Astronomy and astrophysics (Berlin)
container_volume 450
creator Foschini, L.
Pian, E.
Maraschi, L.
Raiteri, C. M.
Tavecchio, F.
Ghisellini, G.
Tosti, G.
Malaguti, G.
Di Cocco, G.
description 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.
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source Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; EZB-FREE-00999 freely available EZB journals
subjects galaxies: quasars: general
galaxies: quasars: individual: NRAO 530
X-rays: galaxies
title A short hard X-ray flare from the blazar NRAO 530 observed by INTEGRAL
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