X-ray emission of z > 2.5 active galactic nuclei can be obscured by their host galaxies
文献类型：期刊论文
| 作者 | Circosta, C.2; Vignali, C.3,4; Gilli, R.4; Feltre, A.5; Vito, F.6,7,8; Calura, F.4; Mainieri, V2; Massardi, M.9; Norman, C.1,10 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2019-03-28 |
| 卷号 | 623页码:14 |
| 关键词 | galaxies: active galaxies: evolution galaxies: star formation quasars: general surveys X-rays: galaxies |
| ISSN号 | 1432-0746 |
| DOI | 10.1051/0004-6361/201834426 |
| 英文摘要 | We present a multiwavelength study of seven active galactic nuclei (AGN) at spectroscopic redshift >2.5 in the 7 Ms Chandra Deep Field South that were selected for their good far-infrared (FIR) and submillimeter (submm) detections. Our aim is to investigate the possibility that the obscuration observed in the X-rays can be produced by the interstellar medium (ISM) of the host galaxy. Based on the 7 Ms Chandra spectra, we measured obscuring column densities N-H,N- X in excess of 7 x 10(22) cm(-2) and intrinsic X-ray luminosities L-X > 10(44) erg s(-1) for our targets, as well as equivalent widths for the Fe K alpha emission line EWrest greater than or similar to 0.5-1 keV. We built the UV-to-FIR spectral energy distributions (SEDs) by using broadband photometry from the CANDELS and Herschel catalogs. By means of an SED decomposition technique, we derived stellar masses (M-* similar to 10(11) M-circle dot), IR luminosities (L-IR > 10(12) L-circle dot), star formation rates (SFR similar to 190-1680 M-circle dot yr(-1)) and AGN bolometric luminosities (L-bol similar to 10(46) erg s(-1)) for our sample. We used an empirically calibrated relation between gas masses and FIR/submm luminosities and derived M-gas similar to 0.8-5.4 x 10(10) M-circle dot. High-resolution (0.3-0.7 '') ALMA data (when available, CANDELS data otherwise) were used to estimate the galaxy size and hence the volume enclosing most of the ISM under simple geometrical assumptions. These measurements were then combined to derive the column density associated with the ISM of the host, which is on the order of N-H,N- ISM similar to 10(23-24) cm(-2). The comparison between the ISM column densities and those measured from the X-ray spectral analysis shows that they are similar. This suggests that at least at high redshift, significant absorption on kiloparsec scales by the dense ISM in the host likely adds to or substitutes that produced by circumnuclear gas on parsec scales (i.e., the torus of unified models). The lack of unobscured AGN among our ISM-rich targets supports this scenario. |
| WOS关键词 | SUPERMASSIVE BLACK-HOLES ; SPECTRAL ENERGY-DISTRIBUTIONS ; HUBBLE-SPACE-TELESCOPE ; DEEP FIELD-SOUTH ; AGN DUSTY TORI ; STAR-FORMATION ; MOLECULAR GAS ; PARAMETER-ESTIMATION ; LUMINOSITY FUNCTION ; INFRARED-EMISSION |
| 资助项目 | IMPRS on Astrophysics at the LMU (Munich) ; ASI-INAF[2017-14-H.O] ; ASI-INAF[I/037/12/0] ; ERC[321323-NEOGAL] ; ERC[339659-MUSICOS] ; INAF PRIN-SKA 2017 program[1.05.01.88.04] ; CONICYT ; CASSACA |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000462556100001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | IMPRS on Astrophysics at the LMU (Munich) ; IMPRS on Astrophysics at the LMU (Munich) ; ASI-INAF ; ASI-INAF ; ERC ; ERC ; INAF PRIN-SKA 2017 program ; INAF PRIN-SKA 2017 program ; CONICYT ; CONICYT ; CASSACA ; CASSACA ; IMPRS on Astrophysics at the LMU (Munich) ; IMPRS on Astrophysics at the LMU (Munich) ; ASI-INAF ; ASI-INAF ; ERC ; ERC ; INAF PRIN-SKA 2017 program ; INAF PRIN-SKA 2017 program ; CONICYT ; CONICYT ; CASSACA ; CASSACA ; IMPRS on Astrophysics at the LMU (Munich) ; IMPRS on Astrophysics at the LMU (Munich) ; ASI-INAF ; ASI-INAF ; ERC ; ERC ; INAF PRIN-SKA 2017 program ; INAF PRIN-SKA 2017 program ; CONICYT ; CONICYT ; CASSACA ; CASSACA ; IMPRS on Astrophysics at the LMU (Munich) ; IMPRS on Astrophysics at the LMU (Munich) ; ASI-INAF ; ASI-INAF ; ERC ; ERC ; INAF PRIN-SKA 2017 program ; INAF PRIN-SKA 2017 program ; CONICYT ; CONICYT ; CASSACA ; CASSACA |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/25693]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Circosta, C. |
| 作者单位 | 1.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA 2.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 3.Univ Bologna, Dipartimento Fis & Astron, Via P Gobetti 93-2, I-40129 Bologna, Italy 4.INAF OAS, Osservatorio Astrofis & Sci Spazio Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy 5.Univ Lyonl, Univ Lyon, Ctr Rech Astrophys Lyon UMR5574, Ens Lyon,CNRS, F-69230 St Genis Laval, France 6.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago, Chile 7.Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago, Chile 8.Chinese Acad Sci, Natl Astron Observ, South Amer Ctr Astron, Beijing 100012, Peoples R China 9.INAF, Ist Radioastron Italian ARC, Via Piero Gobetti 101, I-40129 Bologna, Italy 10.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA |
| 推荐引用方式 GB/T 7714 | Circosta, C.,Vignali, C.,Gilli, R.,et al. X-ray emission of z > 2.5 active galactic nuclei can be obscured by their host galaxies[J]. ASTRONOMY & ASTROPHYSICS,2019,623:14. |
| APA | Circosta, C..,Vignali, C..,Gilli, R..,Feltre, A..,Vito, F..,...&Norman, C..(2019).X-ray emission of z > 2.5 active galactic nuclei can be obscured by their host galaxies.ASTRONOMY & ASTROPHYSICS,623,14. |
| MLA | Circosta, C.,et al."X-ray emission of z > 2.5 active galactic nuclei can be obscured by their host galaxies".ASTRONOMY & ASTROPHYSICS 623(2019):14. |
入库方式： OAI收割
来源：国家天文台
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