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Large Scale Outflow from a Radio Loud AGN in Merging Galaxies at Redshift 2.48

Published online by Cambridge University Press:  17 August 2016

Hsin-Yi Shih  and
Alan Stockton
Hsin-Yi Shih
Affiliation:
Gemini Observatory, 670 N. Aohoku Pl, Hilo, HI, 96720, United States email: [email protected]
Alan Stockton
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr. Honolulu, HI, 96822, United States email: [email protected]
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Abstract

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We present observations of a remarkable compact group of galaxies at z = 2.48. Four galaxies, all within 40 kpc of each other, surround a powerful high redshift radio source. This group comprises two compact red passive galaxies and a pair of merging galaxies. One of the red galaxies, with an apparent stellar mass of 3.6×1011 M⊙ and an effective radius of 470 pc, is one of the most extreme examples of a massive quiescent compact galaxy found so far. One of the pair of merging galaxies hosts the AGN producing the large powerful radio structure. The merger is massive and enriched, consistent with the mass-metallicity relation expected at this redshift. Close to the merging nuclei, the emission lines exhibit broad and asymmetric profiles that suggest outflows powered either by a very young expanding radio jet or by AGN radiation. At ≳ 50 kpc from the system, we found a fainter extended-emission region that may be a part of a radio jet-driven outflow.

Keywords

galaxies: evolutiongalaxies: high-redshiftgalaxies: interactionsgalaxies: jetsgalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S319: Galaxies at High Redshift and Their Evolution Over Cosmic Time , August 2015 , pp. 67 - 70
Copyright
Copyright © International Astronomical Union 2016 

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