YNAO OpenIR  > 大样本恒星演化研究组
A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus
Shu, X. W.1; Xue, Y. Q.2,3; Liu, D. Z.4; Wang, T.5,6; Han YK(韩云坤)7; Chang, Y. Y.8; Liu, T.9; Huang, X. X.2; Wang, J. X.2,3; Zheng, X. Z.10; da Cunha, E.11; Daddi, E.5; Elbaz, D.5
Source PublicationASTRONOMY & ASTROPHYSICS
2018-11-13
Volume619Pages:13
DOI10.1051/0004-6361/201833434
Contribution Rank第7完成单位
Indexed BySCI ; EI
KeywordGalaxies: Starburst Galaxies: High-redshift Galaxies: Active Submillimeter: Galaxies X-rays: Galaxies
Abstract

Aims. We present a multiwavelength study of an atypical submillimeter galaxy, GH500.30, in the GOODS-North field, with the aim to understand its physical properties of stellar and dust emission, as well as the central active galactic nucleus (AGN) activity. Although it is shown that the source is likely an extremely dusty galaxy at high redshift, its exact position of submillimeter emission is unknown. 

Methods. We use NOEMA observation at 1.2mm with subarcsecond resolution to resolve the dust emission, and precisely localize the counterparts at other wavelengths, which allows us to better constrain its stellar and dust spectral energy distribution (SED) as well as redshift. We carry out the new near-infrared (NIR) photometry of GH500.30 observed with HST, and perform panchromatic SED modelling from ultraviolet (UV)/optical to submillimeter. We derive the photometric redshift using both NIR and far-infrared (FIR) SED modeling, and place constraints on the stellar and dust properties such as stellar mass, age, dust attenuation, IR luminosity, and star-formation rate (SFR). The AGN properties are inferred from the X-ray spectral analysis and radio observations, and its contribution to the total IR luminosity is estimated from the broadband SED fittings using MAGPHYS. 

Results. With the new NOEMA interferometric imaging, we confirm that the source is a unique dusty galaxy. It has no obvious counterpart in the optical and even NIR images observed with HST at lambda less than or similar to 1.4 mu m. Photometric-redshift analyses from both stellar and dust SED suggest it to likely be at z greater than or similar to 4, though a lower redshift at z greater than or similar to 3.1 cannot be fully ruled out (at 90% confidence interval). Explaining its unusual optical-to-NIR properties requires an old stellar population (similar to 0.67 Gyr), coexisting with a very dusty ongoing starburst component. The latter is contributing to the FIR emission, with its rest-frame UV and optical light being largely obscured along our line of sight. If the observed fluxes at the rest-frame optical /NIR wavelengths were mainly contributed by old stars, a total stellar mass of similar to 3.5 x 10(11) M-circle dot would be obtained. An X-ray spectral analysis suggests that this galaxy harbors a heavily obscured AGN with N-H = 3.3(-1.7)(+2.0) x 10(23) cm(-2) and an intrinsic 2-10 keV luminosity of L-X similar to 2.6 x 10(44) erg s(-1), which places this object among distant type 2 quasars. The radio emission of the source is extremely bright, which is an order of magnitude higher than the star-formation- powered emission, making it one of the most distant radio-luminous dusty galaxies. 

Conclusions. The combined characteristics of the galaxy suggest that the source appears to have been caught in a rare but critical transition stage in the evolution of submillimeter galaxies, where we are witnessing the birth of a young AGN and possibly the earliest stage of its jet formation and feedback.

Funding ProjectChinese NSF[11573001] ; Chinese NSF[11822301] ; National Basic Research Program[2015CB857005] ; Sino-French LIA-Origin joint exchange program ; Anhui Provincial NSF[1608085QA06] ; 973 Program[2015CB857004] ; CAS Frontier Science Key Research Program[QYZDJ-SSW-SLH006] ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme[694343] ; [NSFC-11773063] ; [NSFC-11473026] ; [NSFC-11421303]
Funding OrganizationChinese NSF[11573001, 11822301] ; National Basic Research Program[2015CB857005] ; Sino-French LIA-Origin joint exchange program ; Anhui Provincial NSF[1608085QA06] ; 973 Program[2015CB857004] ; CAS Frontier Science Key Research Program[QYZDJ-SSW-SLH006] ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme[694343] ; [NSFC-11773063] ; [NSFC-11473026] ; [NSFC-11421303]
Language英语
Subject Area天文学 ; 天体物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN1432-0746
URL查看原文
WOS IDWOS:000450199400001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordDeep-field-south ; Spectral Energy-distributions ; Supermassive Black-holes ; Goods-north Field ; Similar-to 2 ; High-redshift ; Midinfrared Spectroscopy ; Photometric Redshift ; Starburst Galaxies ; Emitting Galaxies
EI Accession Number20184706118015
EI KeywordsGalaxies
EI Classification Number451.1air Pollution Sources - 657.2extraterrestrial Physics And Stellar Phenomena - 703.2electric Filters - 932.1high Energy Physics - 941.4optical Variables Measurements
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18403
Collection大样本恒星演化研究组
Corresponding AuthorShu, X. W.
Affiliation1.Department of Physics, Anhui Normal University, Wuhu, Anhui 241000, PR China
2.CAS Key Laboratory for Researches in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, PR China
3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, PR China
4.Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
5.Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu – CNRS – Université Paris Diderot, CEA-Saclay, 91191 Gif-sur-Yvette, France
6.Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
7.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, PR China
8.Academia Sinica Institute of Astronomy and Astrophysics, PO Box 23-141, Taipei 10617, Taiwan
9.Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, bei München, Germany
10.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, PR China
11.The Australian National University, Mt Stromlo Observatory, Cotter Rd, Weston Creek, ACT 2611, Australia
Recommended Citation
GB/T 7714
Shu, X. W.,Xue, Y. Q.,Liu, D. Z.,et al. A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus[J]. ASTRONOMY & ASTROPHYSICS,2018,619:13.
APA Shu, X. W..,Xue, Y. Q..,Liu, D. Z..,Wang, T..,Han YK.,...&Elbaz, D..(2018).A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus.ASTRONOMY & ASTROPHYSICS,619,13.
MLA Shu, X. W.,et al."A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus".ASTRONOMY & ASTROPHYSICS 619(2018):13.
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