Velocities of blue stars near (l,b)=(198,-27) Virtual Observatory Resource

Authors
  1. Yanny B.
  2. Newberg H.J.
  3. Grebel E.K.
  4. Kent S.
  5. Odenkirchen M.
  6. Rockosi C.M.,Schlegel D.
  7. Subbarao M.
  8. Brinkmann J.
  9. Fukugita M.
  10. Ivezic Z.
  11. Lamb D.Q.,Schneider D.P.
  12. York D.G.
  13. Published by
    CDS
Abstract

We present evidence for a ring of stars in the plane of the Milky Way, extending at least from l=180{deg} to 227{deg} with turnoff magnitude g~19.5; the ring could encircle the Galaxy. We infer that the low Galactic latitude structure is at a fairly constant distance of R=18+/-2kpc from the Galactic center above the Galactic plane and has R=20+/-2kpc in the region sampled below the Galactic plane. The evidence includes 500 Sloan Digital Sky Survey spectroscopic radial velocities of stars within 30{deg} of the plane. The velocity dispersion of the stars associated with this structure is found to be 27km/s at (l, b)=(198, -27), 22km/s at (l, b)=(225, 28), 30km/s at (l, b)=(188, 24), and 30km/s at (l, b)=(182, 27). The structure rotates in the same prograde direction as the Galactic disk stars but with a circular velocity of 110+/-25km/s. The narrow measured velocity dispersion is inconsistent with power-law spheroid or thick-disk populations.

Keywords
  1. halo-stars
  2. radial-velocity
  3. visible-astronomy
  4. sloan-photometry
Bibliographic source Bibcode
2003ApJ...588..824Y
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/588/824
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/588/824
Document Object Identifer DOI
doi:10.26093/cds/vizier.15880824

Access

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/588/824
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http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/588/824/table1?

History

2009-02-16T22:39:06Z
Resource record created
2009-02-16T21:43:39Z
Updated
2009-02-16T22:39:06Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr