seyfert nucleus
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2018 ◽  
Vol 2 (2) ◽  
pp. 3 ◽  
Author(s):  
Marlon R. Diniz ◽  
Rogemar A. Riffel ◽  
O. L. Dors


2018 ◽  
Vol 611 ◽  
pp. A71 ◽  
Author(s):  
K. Iwasawa ◽  
V. U ◽  
J. M. Mazzarella ◽  
A. M. Medling ◽  
D. B. Sanders ◽  
...  

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 ~ 4 × 1023 cm−2 but also hinted at the possible presence of a Compton-thick AGN in the N nucleus, where a black hole of ~109 M⊙ 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 10 keV, 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+0.7−0.4 × 1024 cm−2. The estimated 2−10 keV luminosity of the N source is 1.3 × 1043 erg s−1, about a factor of 2 larger than that of SW during the NuSTAR observation. Uncorrelated variability above and below 10 keV 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.



2013 ◽  
Vol 780 (2) ◽  
pp. L24 ◽  
Author(s):  
Rogemar A. Riffel ◽  
Thaisa Storchi-Bergmann ◽  
Rogério Riffel
Keyword(s):  


2012 ◽  
Vol 541 ◽  
pp. L9 ◽  
Author(s):  
G. Weigelt ◽  
K.-H. Hofmann ◽  
M. Kishimoto ◽  
S. Hönig ◽  
D. Schertl ◽  
...  
Keyword(s):  


2009 ◽  
Vol 137 (4) ◽  
pp. 4002-4010 ◽  
Author(s):  
T. G. Wang ◽  
H. Y. Zhou ◽  
D. Grupe ◽  
W. Yuan ◽  
X. B. Dong ◽  
...  


2008 ◽  
Vol 385 (3) ◽  
pp. 1129-1142 ◽  
Author(s):  
Rogemar A. Riffel ◽  
Thaisa Storchi-Bergmann ◽  
Cláudia Winge ◽  
Peter J. McGregor ◽  
Tracy Beck ◽  
...  


2005 ◽  
Vol 358 (3) ◽  
pp. 781-794 ◽  
Author(s):  
J. E. Skelton ◽  
A. Lawrence ◽  
A. Pappa ◽  
P. Lira ◽  
O. Almaini


2005 ◽  
Vol 356 (2) ◽  
pp. 524-530 ◽  
Author(s):  
S. Vaughan ◽  
K. Iwasawa ◽  
A. C. Fabian ◽  
K. Hayashida
Keyword(s):  
X Ray ◽  
Ngc 4395 ◽  


2004 ◽  
Vol 414 (2) ◽  
pp. 453-461 ◽  
Author(s):  
E. L. Agüero ◽  
R. J. Díaz ◽  
E. Bajaja


2002 ◽  
Vol 336 (1) ◽  
pp. 319-327 ◽  
Author(s):  
S. Antón ◽  
A. H. C. Thean ◽  
A. Pedlar ◽  
I. W. A. Browne
Keyword(s):  


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