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题名: Four hot DOGs in the microwave
作者: Frey, Sandor1; Paragi, Zsolt2; Gabanyi, Krisztina Eva1, 3; An, Tao4, 5
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016-01-11
卷号: 455, 期号:2, 页码:2058-2065
关键词: techniques: interferometric ; galaxies: active ; galaxies: high-redshift ; galaxies: starburst ; radio continuum: galaxies
DOI: 10.1093/mnras/stv2399
文章类型: Article
英文摘要: Hot dust-obscured galaxies (hot DOGs) are a rare class of hyperluminous infrared galaxies identified with the Wide-field Infrared Survey Explorer (WISE) satellite. The majority of them are at high redshifts (z similar to 2-3), at the peak epoch of star formation in the Universe. Infrared, optical, radio, and X-ray data suggest that hot DOGs contain heavily obscured, extremely luminous active galactic nuclei (AGN). This class may represent a short phase in the life of the galaxies, signifying the transition from starburst- to AGN-dominated phases. Hot DOGs are typically radio-quiet, but some of them show mJy-level emission in the radio (microwave) band. We observed four hot DOGs using the technique of very long baseline interferometry (VLBI). The 1.7 GHz observations with the European VLBI Network (EVN) revealed weak radio features in all sources. The radio is free from dust obscuration and, at such high redshifts, VLBI is sensitive only to compact structures that are characteristic of AGN activity. In two cases (WISE J0757+5113, WISE J1603+2745), the flux density of the VLBI-detected components is much smaller than the total flux density, suggesting that similar to 70-90 per cent of the radio emission, while still dominated by AGN, originates from angular scales larger than that probed by the EVN. The source WISE J1146+4129 appears a candidate compact symmetric object, and WISE J1814+3412 shows a 5.1 kpc double structure, reminiscent of hotspots in a medium-sized symmetric object. Our observations support that AGN residing in hot DOGs may be genuine young radio sources where starburst and AGN activities coexist.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DUST-OBSCURED GALAXIES ; EXTRAGALACTIC RADIO-SOURCES ; ACTIVE GALACTIC NUCLEI ; SIMILAR-TO 2 ; COMPACT SYMMETRIC OBJECTS ; STAR-FORMATION ; SUBMILLIMETER GALAXIES ; FOLLOW-UP ; WISE ; EVOLUTION
收录类别: SCI
项目资助者: Hungarian Scientific Research Fund (OTKA)(NN110333) ; China Ministry of Science and Technology(2013CB837900) ; China-Hungary Collaboration and Exchange Programme by the International Cooperation Bureau of the Chinese Academy of Sciences ; European Commission(283393) ; MAGNA project from International Space Science Institute (ISSI) in Bern, Switzerland ; EVN project(EF025)
语种: 英语
WOS记录号: WOS:000368007100068
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16104
Appears in Collections:近地天体探测和太阳系天体研究团组_期刊论文

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作者单位: 1.FOMI, Satellite Geodet Observ, H-1592 Budapest, Hungary
2.VLBI ERIC, Joint Inst, NL-7990 AA Dwingeloo, Netherlands
3.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, H-1525 Budapest, Hungary
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
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