2002A&A...381..834V


Query : 2002A&A...381..834V

2002A&A...381..834V - Astronomy and Astrophysics, volume 381834-840 (2002/1-3)

Disclosing the true nature of the Sy 2 galaxy NGC 3281: One more Compton-thick source.

VIGNALI C. and COMASTRI A.

Abstract (from CDS):

We present the BeppoSAX broad-band X-ray spectrum of the Seyfert 2 galaxy NGC 3281. The source high-energy spectrum is characterized by the nuclear transmitted component, with an absorbing column density of ≃2x1024cm–2, while the MECS spectrum is reflection-dominated, with a prominent (EW≃0.5-1.2keV) iron Kα emission line. The source is detected at only the 5σ significance level in the LECS band, because of the strong obscuration which hampers at low energies the direct view of the active nucleus harbored in NGC 3281. BeppoSAX results are consistent with the scenario where NGC 3281 is inclined more than 60° with respect to the line-of-sight. Combining the NH value obtained from the present X-ray analysis with the AV measurement, a NH/AV about 50 times the Galactic value is derived.

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Journal keyword(s): galaxies: Seyferts: individual: NGC 3281 - galaxies: nuclei - galaxies: active - X-rays: galaxies

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
2 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
3 QSO B1030-357 Bla 10 33 07.6609493088 -36 01 56.813207664   20.6 20.6 18.4   ~ 50 1
4 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
5 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2
6 NGC 7674 Sy1 23 27 56.6973043968 +08 46 44.253707772 13.84 13.92 13.23 12.64   ~ 738 2

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