2000A&A...355..113G


Query : 2000A&A...355..113G

2000A&A...355..113G - Astronomy and Astrophysics, volume 355, 113-120 (2000/3-1)

A direct view of the AGN powering IRAS 12393+3520.

GUAINAZZI M., DENNEFELD M., PIRO L., BOLLER T., RAFANELLI P. and YAMAUCHI M.

Abstract (from CDS):

We report the first direct X-ray evidence that an AGN is hidden in the center of IRAS 12393+3520. An ASCA observation of this target unveiled a bright (0.5-10keV luminosity 3.9x1042erg/s) and variable source, with minimum observed doubling/halving time scale comprised in the range 30-75ks. A model composed by a simple power-law, with photon index ≃1.8 and an absorption edge, whose threshold energy is consistent with K-shell photoionization of OVII, provides an adequate fit of the spectrum. This suggests that we are observing the emission from the nuclear region through a warm absorber of NH≃ a few 1021cm–2. If it has internal dust with Galactic gas-to-dust ratio, it could explain the lack of broad Hβ emission, even in the episodic presence of a broad Hα emission line. Optical spectra obtained over several years show indeed variations in the strength of this broad Hα component. A distribution of dusty, optically thick matter on spatial scales a few hundreds parsec, which does not intercept the line of sight towards the nucleus, is probably required to account simultaneously for the relative [OIII] luminosity deficit in comparison to the X-rays. The high IR to X-ray luminosity ratio is most likely due to intense star formation in the circumnuclear region. IRAS 12393+3520 might thus exhibit simultaneously nuclear activity and remarkable star formation.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies - galaxies: active - galaxies: Seyfert - galaxies: individual: IRAS 12393+3520 - galaxies: ISM - galaxies: nuclei

Nomenclature: Table 1, Fig.2: [GDP2000] N (Nos 1-2).

Simbad objects: 7

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Mrk 993 Sy2 01 25 31.4551524072 +32 08 10.473856512   15.01 13.96     ~ 210 0
2 Mrk 1018 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 292 0
3 IC 450 Sy1 06 52 12.3346265592 +74 25 37.121227716   15.16 14.19     ~ 531 1
4 2MASX J12411722+3503505 G 12 41 17.2237223328 +35 03 50.484686076           ~ 2 0
5 NGC 4619 Sy1 12 41 44.5514475312 +35 03 45.964567044   13.5       ~ 96 0
6 [GDP2000] 1 X 12 41 58.2 +35 06 24           ~ 1 0
7 [GDP2000] 2 X 12 41 58.8 +35 03 21           ~ 1 0

To bookmark this query, right click on this link: simbad:objects in 2000A&A...355..113G and select 'bookmark this link' or equivalent in the popup menu


2022.05.20-19:26:35

© Université de Strasbourg/CNRS

    • Contact