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, Y. K.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
Corresponding AuthorShu, X. W.(
AbstractAims. 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.
Keywordgalaxies: starburst galaxies: high-redshift galaxies: active submillimeter: galaxies X-rays: galaxies
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000450199400001
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Document Type期刊论文
Corresponding AuthorShu, X. W.
Affiliation1.Anhui Normal Univ, Dept Phys, Wuhu 241000, Anhui, Peoples R China
2.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
3.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
4.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
5.Univ Paris Diderot, CEA Saclay, CNRS, Lab AIM Paris Saclay,CEA DSM Irfu, F-91191 Gif Sur Yvette, France
6.Univ Tokyo, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan
7.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China
8.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan
9.Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany
10.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
11.Australian Natl Univ, Mt Stromlo Observ, Cotter Rd, Weston, ACT 2611, Australia
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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, Y. K..,...&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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