NOAO >   Observing Info >   Approved Programs >   2009B-0141

Small NOAO Logo

Proposal Information for 2009B-0141


PI: Youichi Ohyama, Academia Sinica, ohyama@asiaa.sinica.edu.tw
Address: Inst. of Astron. and Astrophys. (ASIAA), No.1, Roosevelt Rd, Sec. 4, Taipei 10617, Taiwan

CoI: Jeremy Lim, ASIAA
CoI: I-Ting Ho, ASIAA

Title: Deep [FeII] 1.644(micron) Imaging and Excitation Mechanism of Huge Nebula around NGC 1275=Per A

Abstract: NGC 1275 is a cD galaxy in the Perseus cluster of galaxies, and it shows various kinds of activity, including AGN jet-IGM interaction and cooling-flow of IGM. Its huge H(alpha) and H_2 nebulae (extended over ~eq 5 arcmin or ~ 100 kpc in diameter) are considered to be a signature of such activity, and the most likely explanation is X- ray irradiation from hot IGM on the cold cooling-flow matter as traced in CO J=2-1. In addition to these lines, [FeII] 1.644(micron) is also known to be extended and unusually enhanced comparing with Br(gamma), and some kind of dust extraction mechanism is necessary to increase gas- phase Fe abundance. We here propose deep and much wider [FeII] imaging of the galaxy to reveal the site of dust destruction by means of morphological comparison of [FeII]/H_2 and [FeII]/H(alpha) flux-ratio maps with maps of radio continuum and cold CO gas. The results will reveal either jet-IGM interaction or X-ray irradiation from hot IGM is most responsible to create the nebulae and, hence, detailed mechanism of (re-heating) the cooling-flow.


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 >   2009B-0141

noaoprop-help@noao.edu

Small NOAO Logo