Was the Progenitor of the Sagittarius Stream a Disc Galaxy? Recent Results & Observations.

Details Was the Progenitor of the Sagittarius Stream a Disc Galaxy? Recent Results & Observations. Was the Progenitor of the Sagittarius Stream a Disc Galaxy? Recent Results & Observations.

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715228h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.28; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Wrapping around the Milky Way, the Sagittarius (Sgr) stream is one of the most dramatic examples of a stellar tidal stream currently known. Its progenitor, the Sgr dwarf galaxy, has been assumed to be a non-rotating, pressure-supported dwarf spheroidal galaxy. However, to date, no such model for the interaction of Sgr with the Milky Way has been able to reproduce all of the observational features of the stream. Recent theoretical models proposing that the progenitor was a rotating disc galaxy may provide a solution; in particular, the bifurcation of the leading tail of the Sgr stream detected in the SDSS survey naturally arises in models where the Sgr disc is misaligned with respect to the orbital plane. If Sgr was in fact a disc galaxy, these models predict that the core should still show residual internal rotation with a measurable amplitude ( 20 km/s). We have obtained spectra of over 2000 stars near the core of Sgr with AAOmega on the AAT in order to test the disc-galaxy hypothesis, and we present here our preliminary results, along with a comparison to model predictions.

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