Search for Low-Surface Brightness Tidal Features and Luminous Halos around Isolated, Warped Spirals

Details Search for Low-Surface Brightness Tidal Features and Luminous Halos around Isolated, Warped Spirals Search for Low-Surface Brightness Tidal Features and Luminous Halos around Isolated, Warped Spirals

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..365p&link_type=abstract

NOAO Proposal ID #2000A-0365

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Scientific paper

Several lines of investigation appear to show that at least some of the Milky Way's halo was accreted following minor mergers with its satellite dwarf galaxies. This process was proposed by Searle & Zinn to account for some of the spatial, kinematical, and chemical differences among the Milky Way globular cluster population. Recently, the first extragalactic optical analogue to the Searle & Zinn, Milky Way/Sagittarius type interaction was discovered in the NGC 5907 halo. A low surface brightness, elliptical ring is found encircling the disk of NGC 5907 and is likely the remains of a disrupted dwarf. We propose here to search for similar low surface brightness rings around other spirals similar to NGC 5907 and the Milky Way, i.e., spirals with no nearby, massive companions and pronounced HI and/or optical warps. Regardless of the outcome of this search, the observations proposed here will be useful for measuring the integrated light from thick disk and luminous halo stellar populations, which has only been done for a small number of similar galaxies. Finding systems with evidence for both minor mergers and a luminous halo would be beneficial for estimating how much mass is in each component and therefore what fraction of galaxy halos may have originated in tidal disruption events.

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