NOAO >   Observing Info >   Approved Programs >   2016B-0248

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Program Information for 2016B-0248


PI: Hsin-Yi Shih, Gemini Observatory, jshih@gemini.edu
Address: Gemini Observatory, 670 N AOHOKU PLACE, HILO, HI 96720 USA

Title: Host Galaxy Morphologies of Low-Excitation Radio Galaxies with Strong Emission Lines

Abstract: We propose to investigate a population of radio galaxies that appear to be in an intermediate state between the high-excitation radio galaxies (HERGs), which are at the peak of their AGN activities, and the low-excitation radio galaxies (LERGs), which are powered by much lower accretion rates. The vast majority of radio galaxies comprises the low-power LERGs that usually show only weak to no detectable emission lines in the optical. However, there is a population of LERGs that do show very strong emission lines and appear to have many similar properties as their high-excitation counterparts. In the z < 0.3 universe, these LERGs with strong lines appear to be as numerous as the HERGs. Therefore, understanding the nature of these strong-line LERGs may have significant impact on our understanding of the radio-loud AGN and host galaxy coevolution. HERGs are most likely powered by accretion of cold gas through mergers. This proposal seeks to determine whether these strong-line LERGs have also experienced recent merging activities, and how/if they are related to the HERGs on the merger timeline.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016B):  GEM-NQ/GMOSN -- 16hrs band 3 (GN-2016B-Q-78)


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016B-0248

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