PI: Youichi Ohyama, Academia Sinica, email@example.com
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.
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