Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair

doi:10.1051/0004-6361/201935924

CORC > 国家天文台 > 中国科学院国家天文台

	Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair
	Vito, F.2,3,4; Brandt, W. N.5,6,7; Bauer, F. E.2,3,8,9; Gilli, R.10; Luo, B.11,12,13; Zamorani, G.10; Calura, F.10; Comastri, A.10; Mazzucchelli, C.14; Mignoli, M.10
刊名	ASTRONOMY & ASTROPHYSICS
	2019-08-07
卷号	628 页码:5
关键词	early Universe galaxies: high-redshift methods: observational galaxies: individual: J167.6415-13.4960 galaxies: active X-rays: individuals: J167.6415-13.4960
ISSN号	1432-0746
DOI	10.1051/0004-6361/201935924
英文摘要	While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting z > 6 quasars (QSOs) are strongly biased against obscured QSOs, thus considerably limiting our understanding of accreting SMBHs during the first gigayear of the Universe from an observational point of view. We report the Chandra discovery of the first heavily obscured QSO candidate in the early universe, hosted by a close (approximate to 5 kpc) galaxy pair at z = 6.515. One of the members is an optically classified type-1 QSO, PSO167-13. The companion galaxy was first detected as a [C II] emitter by Atacama large millimeter array (ALMA). An X-ray source is significantly (P = 0.9996) detected by Chandra in the 2-5 keV band, with < 1.14 net counts in the 0.5-2 keV band, although the current positional uncertainty does not allow a conclusive association with either PSO167-13 or its companion galaxy. From X-ray photometry and hardness-ratio arguments, we estimated an obscuring column density of N-H > 2 x 10(24) cm(-2) and N-H > 6 x 10(23) cm(-2) at 68% and 90% confidence levels, respectively. Thus, regardless of which of the two galaxies is associated with the X-ray emission, this source is the first heavily obscured QSO candidate at z > 6.
资助项目	CONICYT[Basal-CATA AFB-170002] ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; Chandra X-ray Center[G08-19076X] ; National Key R&D Program of China[2016YFA0400702] ; National Natural Science Foundation of China[11673010] ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative[IC120009] ; ASI-INAF[2017-14-H.O]
WOS关键词	STAR-FORMING GALAXIES ; BLACK-HOLES ; QUASARS ; REDSHIFT ; EVOLUTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000480311200001
资助机构	CONICYT ; CONICYT ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; Chandra X-ray Center ; Chandra X-ray Center ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; ASI-INAF ; ASI-INAF ; CONICYT ; CONICYT ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; Chandra X-ray Center ; Chandra X-ray Center ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; ASI-INAF ; ASI-INAF ; CONICYT ; CONICYT ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; Chandra X-ray Center ; Chandra X-ray Center ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; ASI-INAF ; ASI-INAF ; CONICYT ; CONICYT ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund ; Chandra X-ray Center ; Chandra X-ray Center ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; ASI-INAF ; ASI-INAF
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27399]
专题	中国科学院国家天文台
通讯作者	Vito, F.
作者单位	1.Sorbonne Univ, UPMC Univ Paris 06, F-75014 Paris, France 2.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile 3.Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 22, Chile 4.Chinese Acad Sci, Natl Astron Observ, South Amer Ctr Astron, Beijing 100012, Peoples R China 5.Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA 6.Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA 7.Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA 8.Millennium Inst Astrophys MAS, Nuncio Monsenor Sotero Sanz 100, Santiago, Chile 9.Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA 10.INAF Osservatorio Astrofis & Sci Spazio Bologna, I-40129 Bologna, Italy
推荐引用方式 GB/T 7714	Vito, F.,Brandt, W. N.,Bauer, F. E.,et al. Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair[J]. ASTRONOMY & ASTROPHYSICS,2019,628:5.
APA	Vito, F..,Brandt, W. N..,Bauer, F. E..,Gilli, R..,Luo, B..,...&Volonteri, M..(2019).Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair.ASTRONOMY & ASTROPHYSICS,628,5.
MLA	Vito, F.,et al."Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair".ASTRONOMY & ASTROPHYSICS 628(2019):5.