Model-free Mapping Of Disk And Halo Substructure In SDSS III

Details Model-free Mapping Of Disk And Halo Substructure In SDSS III Model-free Mapping Of Disk And Halo Substructure In SDSS III

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21821706j&link_type=abstract

American Astronomical Society, AAS Meeting #218, #217.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The 8th release of the Sloan Digital Sky Survey featured 2000 deg^2 of new imaging, largely in the southern Galactic hemisphere. This new imaging allows us to perform model-free examination of North-South and East-West symmetry of the Milky Way and detect and characterize structures in the Galactic disk and halo.
Using these data, we show that the Virgo overdensity is significantly more extended ( 3000deg2) than previously estimated. However, we demonstrate it is unlikely to be a global feature of the halo, such as triaxiallity or halo ellipsoid tilt. Combined with previously published measurement of kinematics, the Virgo overdensity is consistent with a strongly disrupted tidal stream observed near perigalacticon.
Secondly, we map the extent of the "thick disk asymmetry", a major ring-like feature in the thick disk at 3-5 kpc (heliocentric) towards the Galactic anticenter. While clearly detected in the nearly-synoptic SDSS III maps, its nature remains unclear; a merger remnant, a warp in the disk, or an effect of spiral structure may all serve as explanations of its origin. Follow-up observations are ongoing to better understand its nature.

Affiliated with

Also associated with

No associations

Rating

Model-free Mapping Of Disk And Halo Substructure In SDSS III does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Model-free Mapping Of Disk And Halo Substructure In SDSS III, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Model-free Mapping Of Disk And Halo Substructure In SDSS III will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1739164