Other
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60088l&link_type=abstract
Spitzer Proposal ID #60088
Other
Scientific paper
Minor mergers and satellite accretion events have the ability to dramatically change the appearance of the parent galaxy and even cause substantial evolution from bulgeless galaxies toward early-type disk galaxies and ellipticals. They also presumably take place at a much higher frequency than the more spectacular major mergers. We propose to characterize the stellar populations of extragalactic tidal stellar streams with ultra-deep IRAC channel 1 observations . These observations take advantage of IRAC's unique capability to detect extended, faint surface brightness emission, and will push IRAC to new frontiers. We seek to observe two edge-on disk galaxies which have known visible light stellar streams, and determine the visible light - infrared colors of the streams. This will help us to determine the structural types and stellar masses of the disrupted companion galaxies, which has immediate significance on the understanding of bulge formation, halo build-up and numerous other important topics that have been proposed to occur with the help of minor mergers. We ask for a total of 23.1 hours of observing time with IRAC.
Arendt Richard
Ashby Matthew
Gabany Jay R.
Grillmair Carl C.
Laine Seppo
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