2018A&A...611A..71I


Query : 2018A&A...611A..71I

2018A&A...611A..71I - Astronomy and Astrophysics, volume 611A, 71-71 (2018/3-1)

Testing a double AGN hypothesis for Mrk 273.

IWASAWA K., U V., MAZZARELLA J.M., MEDLING A.M., SANDERS D.B. and EVANS A.S.

Abstract (from CDS):

The ultra-luminous infrared galaxy (ULIRG) Mrk 273 contains two infrared nuclei, N and SW, separated by 1-arcsecond. A Chandra observation has identified the SW nucleus as an absorbed X-ray source with NH∼4x1023cm–2 but also hinted at the possible presence of a Compton-thick AGN in the N nucleus, where a black hole of ∼109M is inferred from the ionized gas kinematics. The intrinsic X-ray spectral slope recently measured by NuSTAR is unusually hard (Γ∼1.3) for a Seyfert nucleus, for which we seek an alternative explanation. We hypothesize a strongly absorbed X-ray source in N, of which X-ray emission rises steeply above 10keV, in addition to the known X-ray source in SW, and test it against the NuSTAR data, assuming the standard spectral slope (Γ=1.9). This double X-ray source model gives a good explanation of the hard continuum spectrum, deep Fe K absorption edge, and strong Fe K line observed in this ULIRG, without invoking the unusual spectral slope required for a single source interpretation. The putative X-ray source in N is found to be absorbed by NH=1.4+0.7–0.4x1024cm–2. The estimated 2-10keV luminosity of the N source is 1.3x1043erg/s, about a factor of 2 larger than that of SW during the NuSTAR observation. Uncorrelated variability above and below 10keV between the Suzaku and NuSTAR observations appears to support the double source interpretation. Variability in spectral hardness and Fe K line flux between the previous X-ray observations is also consistent with this picture.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: nuclei - 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 - 2022
#notes
1 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 625 4
2 NGC 5256 PaG 13 38 17.5 +48 16 37   14.1 13.42     ~ 418 1
3 Mrk 273 Sy2 13 44 42.1883001096 +55 53 13.596220932   15.68 14.91     ~ 870 3
4 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2848 4
5 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1573 2
6 LEDA 64593 Sy2 20 23 25.35647 +11 31 35.2200   15.83       ~ 50 1

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2022.10.06-20:03:53

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