NAOC Open IR
Searching for obscured AGN in z similar to 2 submillimetre galaxies
Chen, H.1,2,3; Garrett, M. A.2,4; Chi, S.5,6,7; Thomson, A. P.2; Barthel, P. D.5; Alexander, D. M.8; Muxlow, T. W. B.2; Beswick, R. J.2; Radcliffe, J. F.2,9,10; Wrigley, N. H.2; Guidetti, D.11; Bondi, M.11; Prandoni, I.11; Smail, I.8; McHardy, I.12; Argo, M. K.2,13
2020-06-23
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume638Pages:10
AbstractAims. Submillimetre-selected galaxies (SMGs) at high redshift (z similar to 2) are potential host galaxies of active galactic nuclei (AGN). If the local Universe is a good guide, similar to 50% of the obscured AGN amongst the SMG population could be missed even in the deepest X-ray surveys. Radio observations are insensitive to obscuration; therefore, very long baseline interferometry (VLBI) can be used as a tool to identify AGN in obscured systems. A well-established upper limit to the brightness temperature of 10(5) K exists in star-forming systems, thus VLBI observations can distinguish AGN from star-forming systems via brightness temperature measurements.Methods. We present 1.6 GHz European VLBI Network (EVN) observations of four SMGs (with measured redshifts) to search for evidence of compact radio components associated with AGN cores. For two of the sources, e-MERLIN images are also presented.Results. Out of the four SMGs observed, we detect one source, J123555.14, that has an integrated EVN flux density of 201 +/- 15.2 mu Jy, corresponding to a brightness temperature of 5.2 +/- 0.7 x 10(5) K. We therefore identify that the radio emission from J123555.14 is associated with an AGN. We do not detect compact radio emission from a possible AGN in the remaining sources (J123600.10, J131225.73, and J163650.43). In the case of J131225.73, this is particularly surprising, and the data suggest that this may be an extended, jet-dominated AGN that is resolved by VLBI. Since the morphology of the faint radio source population is still largely unknown at these scales, it is possible that with a similar to 10 mas resolution, VLBI misses (or resolves) many radio AGN extended on kiloparsec scales.
Keywordinstrumentation: high angular resolution techniques: interferometric galaxies: active galaxies: nuclei galaxies: starburst
Funding OrganizationScience and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils
DOI10.1051/0004-6361/201937162
WOS KeywordDEEP FIELD-SOUTH ; ACTIVE GALACTIC NUCLEI ; STAR-FORMATION RATES ; RADIO-SOURCES ; HIGH-RESOLUTION ; ALMA SURVEY ; HIGH-REDSHIFT ; HUBBLE-DEEP ; FAINT AGN ; SHARC-II
Language英语
Funding ProjectScience and Technology Facilities Council (STFC)[201704910999] ; China Scholarship Council (CSC)[201704910999] ; STFC[ST/P000541/1] ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; national research councils
Funding OrganizationScience and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; STFC ; STFC ; INAF under the PRIN SKA/CTA "FORECaST" project ; INAF under the PRIN SKA/CTA "FORECaST" project ; South Africa Radio Astronomy Observatory ; South Africa Radio Astronomy Observatory ; national research councils ; national research councils
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000545014600002
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82776
Collection中国科学院国家天文台
Corresponding AuthorChen, H.
Affiliation1.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Manchester, Dept Phys & Astron, Jodrell Bank Ctr Astrophys JBCA, Alan Turing Bldg, Manchester M13 9PL, Lancs, England
3.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
4.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
5.Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands
6.Joint Inst VLBI Europe JIVE, POB 2, NL-7990 AA Dwingeloo, Netherlands
7.Netherlands Fdn Res Astron ASTRON, POB 2, NL-7990 AA Dwingeloo, Netherlands
8.Univ Durham, Dept Phys, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England
9.Univ Pretoria, Dept Phys, Lynnwood Rd, ZA-0083 Pretoria, South Africa
10.South African Radio Astron Observ, 3rd Floor,Pk Rd, ZA-7405 Cape Town, South Africa
11.INAF Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy
12.Univ Southampton, Phys & Astron, Southampton SO17 1BJ, Hants, England
13.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
Recommended Citation
GB/T 7714
Chen, H.,Garrett, M. A.,Chi, S.,et al. Searching for obscured AGN in z similar to 2 submillimetre galaxies[J]. ASTRONOMY & ASTROPHYSICS,2020,638:10.
APA Chen, H..,Garrett, M. A..,Chi, S..,Thomson, A. P..,Barthel, P. D..,...&Argo, M. K..(2020).Searching for obscured AGN in z similar to 2 submillimetre galaxies.ASTRONOMY & ASTROPHYSICS,638,10.
MLA Chen, H.,et al."Searching for obscured AGN in z similar to 2 submillimetre galaxies".ASTRONOMY & ASTROPHYSICS 638(2020):10.
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