NuSTAR AND XMM-NEWTON OBSERVATIONS OF THE HARD X- RAY SPECTRUM OF CENTAURUS A

被引：40

作者：

Fuerst, F. ^{[1
]}

Mueller, C. ^{[2
,3
,4
,5
]}

Madsen, K. K. ^{[1
]}

Lanz, L. ^{[6
]}

Rivers, E. ^{[1
]}

Brightman, M. ^{[1
]}

Arevalo, P. ^{[7
]}

Balokovic, M. ^{[1
]}

Beuchert, T. ^{[3
,4
,5
]}

Boggs, S. E. ^{[8
]}

Christensen, F. E. ^{[9
]}

Craig, W. W. ^{[8
,10
]}

Dauser, T. ^{[4
,5
]}

Farrah, D. ^{[11
]}

Graefe, C. ^{[3
,4
,5
]}

Hailey, C. J. ^{[12
]}

Harrison, F. A. ^{[1
]}

Kadler, M. ^{[3
]}

King, A. ^{[13
]}

Krauss, F. ^{[3
,4
,5
]}

Madejski, G. ^{[13
]}

Matt, G. ^{[14
]}

Marinucci, A. ^{[14
]}

Markowitz, A. ^{[15
]}

Ogle, P. ^{[6
]}

Ojha, R. ^{[16
,17
,18
]}

Rothschild, R. ^{[15
]}

Stern, D. ^{[19
]}

Walton, D. J. ^{[1
,19
]}

Wilms, J. ^{[4
,5
]}

Zhang, W. ^{[16
]}

机构：

[1] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[2] Radboud Univ Nijmegen, Dept Astrophys, IMAPP, NL-6500 GL Nijmegen, Netherlands

[3] Univ Wurzburg, Lehrstuhl Astron, D-97074 Wurzburg, Germany

[4] Dr Karl Remeis Sternwarte, D-96049 Bamberg, Germany

[5] ECAP, D-96049 Bamberg, Germany

[6] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA

[7] Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Valparaiso, Chile

[8] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[9] Tech Univ Denmark, Natl Space Inst, DTU Space, DK-2800 Lyngby, Denmark

[10] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[11] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA

[12] Columbia Univ, Columbia Astrophys Lab, 538 W 120th St, New York, NY 10027 USA

[13] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

[14] Univ Rome Tre, Dipartimento Matemat & Fis, I-00146 Rome, Italy

[15] Univ Calif San Diego, CASS, La Jolla, CA 92093 USA

[16] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[17] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA

[18] Catholic Univ Amer, Washington, DC 20064 USA

[19] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 819卷 / 02期

基金：

美国国家航空航天局;

关键词：

galaxies: active; galaxies: individual (Centaurus A); X-rays: galaxies; ACTIVE GALACTIC NUCLEI; RADIO GALAXY CENTAURUS; PHOTON IMAGING CAMERA; CLUMPY-TORUS MODELS; COMPTON-THICK; 3C; 273; BEPPOSAX OBSERVATIONS; INTERSTELLAR-MEDIUM; CORONAL PROPERTIES; SEYFERT-GALAXIES;

D O I：

10.3847/0004-637X/819/2/150

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present simultaneous XMM-Newton and Nuclear Spectroscopic Telescope Array (NuSTAR) observations spanning 3-78 keV of the nearest radio galaxy, Centaurus. A (Cen A). The accretion geometry around the central engine in Cen. A is still debated, and we investigate possible configurations using detailed X-ray spectral modeling. NuSTAR imaged the central region of Cen. A with subarcminute resolution at X-ray energies above 10 keV for the first time, but found no evidence for an extended source or other off-nuclear point sources. The XMM-Newton and NuSTAR spectra agree well and can be described with an absorbed power law with a photon index Gamma = 1.815 +/- 0.005 and a fluorescent Fe K alpha line in good agreement with literature values. The spectrum does not require a high-energy exponential rollover, with a constraint of E-fold > 1 MeV. A thermal Comptonization continuum describes the data well, with parameters that agree with values measured by INTEGRAL, in particular an electron temperature kT(e) between approximate to 100-300 keV and seed photon input temperatures between 5 and 50 eV. We do not find evidence for reflection or a broad iron line and put stringent upper limits of R < 0.01 on the reflection fraction and accretion disk illumination. We use archival Chandra data to estimate the contribution from diffuse emission, extra-nuclear point sources, and the outer X-ray jet to the observed NuSTAR and XMM-Newton X-ray spectra and find the contribution to be negligible. We discuss different scenarios for the physical origin of the observed hard X-ray spectrum and conclude that the inner disk is replaced by an advection-dominated accretion flow or that the X-rays are dominated by synchrotron self-Compton emission from the inner regions of the radio jet or a combination thereof.

引用

页数：13

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