Spitzer Study of the Hidden Galaxy HIZOAJ0836-43

Details Spitzer Study of the Hidden Galaxy HIZOAJ0836-43 Spitzer Study of the Hidden Galaxy HIZOAJ0836-43

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30914k&link_type=abstract

Spitzer Proposal ID #30914

Physics

Scientific paper

We aim to study the extremely massive spiral galaxy HIZOAJ0836-43 (Vh = 10689 km/s) with the Spitzer Space Telescope. This optically obscured galaxy was detected in a systematic HI survey of the southern Zone of Avoidance. Its intriguing properties -- enormous HI and dynamical mass, despite a NIR morphology suggestive of S0 or Sa type, and an active central starforming bulge indicative of starburst activity or even an AGN -- have led to many questions about its nature and origin (Kraan-Korteweg et al. 2005; Staveley-Smith et al. 2005; Donley et al. 2006). High-resolution Spitzer IRAC & MIPS images of HIZOAJ0836-43 are essential to reveal the stellar and dust content of its disk, the extent of the disk and its morphology, while IRS spectroscopy is needed to investigate the nature of the nucleus and test for the presence of an AGN. We also wish to study the environment of HIZOAJ0836-43 which appears to lie in a high-density filament associated with the Shapley cluster and understand how such a supermassive galaxy could have formed by today within the current hierarchical galaxy formation models.

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