Issue |
A&A
Volume 429, Number 2, January II 2005
|
|
---|---|---|
Page(s) | 427 - 431 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20041871 | |
Published online | 17 December 2004 |
INTEGRAL observations of the field of the BL Lacertae object S5 0716+714*
1
INAF - Osservatorio Astronomico di Trieste, via GB Tiepolo 11, 34131 Trieste, Italy e-mail: pian@ts.astro.it
2
IASF-CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
3
NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771, USA
4
Joint Center for Astrophysics, Department of Physics, University of Maryland, Baltimore County, MD 21250, USA
5
Tuorla Observatory, University of Turku, 21500 Piikkiö, Finland
6
Science Data Center, Chemin d'Écogia 16, 1290 Versoix, Switzerland
7
INAF - Osservatorio Astronomico di Brera, via E Bianchi, 46, 23807 Merate (LC), Italy
8
ESA-ESTEC, RSSD, Keplerlaan 1, Postbus 299, 2200 AG Noordwijk, The Netherlands
9
INAF - Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
10
Department of Astronomy, University of Bologna, via Ranzani 1, 40127 Bologna, Italy
11
Dipartimento di Fisica e Matematica, University of Insubria, via Valleggio 11, 22100 Como, Italy
12
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
13
ASI Science Data Center, via Galileo Galilei, 00044 Frascati, Italy
14
Astronomical Institute, 251 65 Ondrejov, Czech Republic
15
Centre d'Étude Spatiale de Rayonnements, 31028 Toulouse, France
16
Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Spain
17
INAF - Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), Italy
18
Nikolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
19
Metsähovi Radio Observatory, Metsähovintie 114, 02540 Kylmälä, Finland
20
Department of Physics, University of Perugia, via A Pascoli, 06123 Perugia, Italy
Received:
20
August
2004
Accepted:
26
August
2004
We have performed observations of the blazar S5 0716+714
with INTEGRAL on 2-6 April 2004. In the first months of 2004, the
source had increased steadily in optical brightness and had undergone
two outbursts. During the latter outburst, that
occurred in March, it reached the
extreme level of mag, which triggered our INTEGRAL
program. The target has been detected with IBIS/ISGRI up to 60 keV,
with a flux of ∼
erg s-1 cm-2 in the
30–60 keV interval, a factor of ~2 higher than observed by the
BeppoSAX PDS in October 2000. In the field of S5 0716+714 we
have also detected the Flat Spectrum Radio Quasar S5 0836+710 and the
two Seyfert galaxies Mkn 3 and Mkn 6. Their IBIS/ISGRI spectra are
rather flat, albeit consistent with those measured by BeppoSAX.
In the spectrum of Mkn 3 we find some evidence of a
break between ~60 and ~100 keV, reminiscent of the high
energy cut-offs observed in other Seyfert galaxies.
This is the first report of INTEGRAL spectra of weak Active
Galactic Nuclei.
Key words: galaxies: active / gamma-rays: observations
© ESO, 2005
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