Further Evidence for a Merger Origin for the Thick Disk: Galactic Stars Along Lines-of-sight to Dwarf Spheroidal Galaxies

Details Further Evidence for a Merger Origin for the Thick Disk: Galactic Stars Along Lines-of-sight to Dwarf Spheroidal Galaxies Further Evidence for a Merger Origin for the Thick Disk: Galactic Stars Along Lines-of-sight to Dwarf Spheroidal Galaxies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20712309w&link_type=abstract

American Astronomical Society Meeting 207, #123.09; Bulletin of the American Astronomical Society, Vol. 37, p.1368

Astronomy and Astrophysics

Astronomy

Scientific paper

The history of the Milky Way Galaxy is written in the properties of its stellar populations. Here we analyse stars observed as part of surveys of local dwarf spheroidal galaxies, but which from their kinematics are highly probable to be non-members. The selection function -- designed to target metal-poor giants in the dwarf galaxies, at distances of around 100 kpc -- includes F-M dwarfs in the Milky Way, at distances of up to several kpc. The stars whose motions are analysed here lie close to the cardinal directions of Galactic longitude ℓ=270circ and ℓ=90circ, where the radial velocity is sensitive to the orbital rotational velocity, Vφ . We demonstrate that the faint F/G stars contain a significant population with Vφ ˜ 100 km/s, which does not match either the canonical thick disk or the stellar halo. We argue that this apparently pervasive population has the expected properties of `satellite debris' in the thick-disk/halo interface, which we interpret as remnants of the merger that heated a pre-existing thin disk to form the thick disk.

Affiliated with

Also associated with

No associations

Rating

Further Evidence for a Merger Origin for the Thick Disk: Galactic Stars Along Lines-of-sight to Dwarf Spheroidal Galaxies 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 Further Evidence for a Merger Origin for the Thick Disk: Galactic Stars Along Lines-of-sight to Dwarf Spheroidal Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Further Evidence for a Merger Origin for the Thick Disk: Galactic Stars Along Lines-of-sight to Dwarf Spheroidal Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1285153