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http://hdl.handle.net/20.500.12386/26524
Titolo: | A CO-rich merger shaping a powerful and hyperluminous infrared radio galaxy at z = 2: the Dragonfly Galaxy | Autori: | Emonts, B. H. C. Mao, M. Y. Stroe, A. PENTERICCI, Laura Villar-Martín, M. Norris, R. P. Miley, G. De Breuck, C. van Moorsel, G. A. Lehnert, M. D. Carilli, C. L. Röttgering, H. J. A. Seymour, N. Sadler, E. M. Ekers, R. D. Drouart, G. Feain, I. Colina, L. Stevens, J. Holt, J. |
Data pubblicazione: | 2015 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 451 | Fascicolo: | 1 | Da pagina:: | 1025 | Abstract: | In the low-redshift Universe, the most powerful radio sources are often associated with gas-rich galaxy mergers or interactions. We here present evidence for an advanced, gas-rich (`wet') merger associated with a powerful radio galaxy at a redshift of z ̃ 2. This radio galaxy, MRC 0152-209, is the most infrared-luminous high-redshift radio galaxy known in the Southern hemisphere. Using the Australia Telescope Compact Array, we obtained high-resolution CO(1-0) data of cold molecular gas, which we complement with Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 (WFPC2) imaging and William Herschel Telescope long-slit spectroscopy. We find that, while roughly M<SUB>H2</SUB> ̃ 2 × 10<SUP>10</SUP> M<SUB>☉</SUB> of molecular gas coincides with the central host galaxy, another M<SUB>H2</SUB> ̃ 3 × 10<SUP>10</SUP> M<SUB>☉</SUB> is spread across a total extent of ̃60 kpc. Most of this widespread CO(1-0) appears to follow prominent tidal features visible in the rest-frame near-UV HST/WFPC2 imaging. Lyα emission shows an excess over He II, but a deficiency over L<SUB>IR</SUB>, which is likely the result of photoionization by enhanced but very obscured star formation that was triggered by the merger. In terms of feedback, the radio source is aligned with widespread CO(1-0) emission, which suggests that there is a physical link between the propagating radio jets and the presence of cold molecular gas on scales of the galaxy's halo. Its optical appearance, combined with the transformational stage at which we witness the evolution of MRC 0152-209, leads us to adopt the name `Dragonfly Galaxy'. | Acknowledgments: | We thank Santiago Arribas for useful discussions. We also thank the anonymous referee for valuable suggestions that significantly improved this paper. BE gratefully acknowledges that the research leading to these results was funded by the European Union Seventh Framework Programme (FP7-PEOPLE-2013-IEF) under grant agreement no. 624351, and by Australia's Commonwealth Scientific and Industrial Research Organization (CSIRO). MVM's work has been funded with support from the Spanish Ministerio de Economía y Competitividad through the grant AYA2012-32295. NS is the recipient of an ARC Future Fellowship. We thank the staff at the ATCA for their dedicated help in making our project successful. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. Based on observations made with the NASA/ESA Hubble Space Telescope , obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555 – these observations are associated with programme 8183. The William Herschel Telescope is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. | URI: | http://hdl.handle.net/20.500.12386/26524 | URL: | https://academic.oup.com/mnras/article/451/1/1025/1360319 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv930 | Bibcode ADS: | 2015MNRAS.451.1025E | Fulltext: | open |
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