A New Compton-thick AGN in Our Cosmic Backyard: Unveiling the Buried Nucleus in NGC 1448 with NuSTAR

被引：15

作者：

Annuar, A. ^{[1
]}

Alexander, D. M. ^{[1
]}

Gandhi, P. ^{[2
]}

Lansbury, G. B. ^{[1
]}

Asmus, D. ^{[3
]}

Ballantyne, D. R. ^{[4
]}

Bauer, F. E. ^{[5
,6
,7
,8
]}

Boggs, S. E. ^{[9
]}

Boorman, P. G. ^{[2
]}

Brandt, W. N. ^{[10
,11
,12
]}

Brightman, M. ^{[13
]}

Christensen, F. E. ^{[14
]}

Craig, W. W. ^{[9
,15
]}

Farrah, D. ^{[16
]}

Goulding, A. D. ^{[17
]}

Hailey, C. J. ^{[18
]}

Harrison, F. A. ^{[13
]}

Koss, M. J. ^{[19
]}

LaMassa, S. M. ^{[20
]}

Murray, S. S. ^{[21
,22
]}

Ricci, C. ^{[5
,6
,23
]}

Rosario, D. J. ^{[1
]}

Stanley, F. ^{[1
,24
]}

Stern, D. ^{[20
]}

Zhang, W.

机构：

[1] Univ Durham, Ctr Extragalact Astron, Dept Phys, South Rd, Durham DH1 3LE, England

[2] Univ Southampton, Dept Phys & Astron, Fac Phys Sci & Engn, Southampton SO17 1BJ, Hants, England

[3] European Southern Observ, Casilla 19001, Santiago, Chile

[4] Georgia Inst Technol, Ctr Relativist Astrophys, Sch Phys, Atlanta, GA 30332 USA

[5] Pontificia Univ Catolica Chile, Inst Astrofis, Casilla 306, Santiago 22, Chile

[6] Pontificia Univ Catolica Chile, Centro Astroingn, Fac Fis, Casilla 306, Santiago 22, Chile

[7] Millennium Inst Astrophys MAS, Nuncio Monsenor Sotero Sanz 100, Santiago, Chile

[8] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA

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

[10] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

[11] Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA

[12] Penn State Univ, Dept Phys, 525 Davey Lab, University Pk, PA 16802 USA

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

[14] Tech Univ Denmark, DTU Space, Natl Space Inst3, Elektrovej 327, DK-2800 Lyngby, Denmark

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

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

[17] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[18] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[19] Swiss Fed Inst Technol, Inst Astron, Dept Phys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

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

[21] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[22] Johns Hopkins Univ, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA

[23] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[24] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 836卷 / 02期

基金：

瑞士国家科学基金会; 英国科学技术设施理事会; 美国国家航空航天局;

关键词：

galaxies: active; galaxies: nuclei; techniques: spectroscopic; X-rays: galaxies; X-rays: individual (NGC 1448); ACTIVE GALACTIC NUCLEI; STAR-FORMING GALAXIES; X-RAY-EMISSION; SUBARCSECOND MIDINFRARED VIEW; SUPERMASSIVE BLACK-HOLES; SWIFT-BAT SURVEY; POPULATION SYNTHESIS; NEARBY GALAXIES; COMPLETE CENSUS; HOST GALAXIES;

D O I：

10.3847/1538-4357/836/2/165

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

NGC 1448 is one of the nearest luminous galaxies (L-8-1000(mu m) > 10(9) L-circle dot) to ours (z = 0.00390), and yet the active galactic nucleus (AGN) it hosts was only recently discovered, in 2009. In this paper, we present an analysis of the nuclear source across three wavebands: mid-infrared (MIR) continuum, optical, and X-rays. We observed the source with the Nuclear Spectroscopic Telescope Array (N(u)STAR), and combined these data with archival Chandra data to perform broadband X-ray spectral fitting (approximate to 0.5-40 keV) of the AGN for the first time. Our X-ray spectral analysis reveals that the AGN is buried under a Compton-thick (CT) column of obscuring gas along our line of sight, with a column density of N-H(los)greater than or similar to 2.5 x 10(24) cm(-2). The best-fitting torus models measured an intrinsic 2-10 keV luminosity of L-2-10, int = (3.5-7.6). x. 10(40)erg s(-1), making NGC 1448 one of the lowest luminosity CTAGNs known. In addition to the NuSTAR observation, we also performed optical spectroscopy for the nucleus in this edge-on galaxy using the European Southern Observatory New Technology Telescope. We reclassify the optical nuclear spectrum as a Seyfert on the basis of the Baldwin-Philips-Terlevich diagnostic diagrams, thus identifying the AGN at optical wavelengths for the first time. We also present high spatial resolution MIR observations of NGC 1448 with Gemini/T-ReCS, in which a compact nucleus is clearly detected. The absorption-corrected 2-10 keV luminosity measured from our X-ray spectral analysis agrees with that predicted from the optical [O III]lambda 5007 angstrom emission line and the MIR 12 mu m. continuum, further supporting the CT nature of the AGN.

引用

页数：13

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