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A CO-rich merger shaping a powerful and hyperluminous infrared radio galaxy at z=2: the Dragonfly Galaxy

B. H. C. Emonts ; M. Y. Mao ; A. Stroe ; L. Pentericci ; M. Villar-Martin ; R. P. Norris ; G. Miley ; C. De Breuck ; G. A. van Moorsel ; M. D. Lehnert ; C. L. Carilli ; H. J. A. Rottgering ; N. Seymour ; E. M. Sadler ; R. D. Ekers ; Guillaume Drouart (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; I. Feain ; L. Colina ; J. Stevens ; J. Holt
Monthly Notices of the Royal Astronomical Society (0035-8711). Vol. 451 (2015), 1, p. 1025-1035.
[Artikel, refereegranskad vetenskaplig]

In the low-redshift Universe, the most powerful radio sources are often associated with gasrich 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 similar to 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 highresolution CO(1-0) data of cold molecular gas, which we complement with Hubble Space Telescope (HS7)IWide Field Planetaiy Camera 2 (WFPC2) imaging and William Herschel Telescope long-slit spectroscopy. We find that, while roughly M-H2 x 10(10) Me of molecular gas coincides with the central host galaxy, another M-H2 similar to 3 x 10(10) Me 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 HSTIWFPC2 imaging. Lya emission shows an excess over He II, but a deficiency over LIR, 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'.

Nyckelord: ISM: jets and outflows, galaxies: active, galaxies: high-redshift, galaxies: individual: MRC 0152-209, STAR-FORMING GALAXIES, ACTIVE GALACTIC NUCLEI, LUMINOUS SUBMILLIMETER, GALAXIES, MOLECULAR GAS-RESERVOIRS, HIGH-REDSHIFT GALAXIES, MASSIVE DISK, GALAXIES, QUASAR HOST GALAXIES, BAND BACK-END, SCALING RELATIONS, FORMATION HISTORY



Denna post skapades 2015-10-26. Senast ändrad 2016-01-25.
CPL Pubid: 224801

 

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