Halo Structure Traced by SDSS RR Lyrae (CROSBI ID 492129)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Ivezić, Željko ; Lupton, Robert, Schlegel, David ; Smolčić, Vernesa ; Johnston, David ; Gunn, Jim ; Knapp, Gill ; Strauss, Michael, Rockosi, Constance
engleski
Halo Structure Traced by SDSS RR Lyrae
We discuss the density and radial velocity distribution of over 3000 candidate RR Lyrae stars selected by various methods using Sloan Digital Sky Survey data for about 1000 deg^2 of sky. This is more than 20 times larger sample than previously reported by SDSS (Ivezic et al. 2000), and includes candidate RR Lyrae stars out to the sample limit of 100 kpc. A cutoff in the radial distribution of halo RR Lyrae at ~50-60 kpc that was suggested by the early SDSS data eppears to be a statistical anomaly confined to a small region (~100 deg^2). Despite the large increase in observed area, the most prominent features remain to be those associated with the Sgr dwarf tidal stream. We find multiple number density peaks along three lines of sight in the Sgr dwarf tidal stream plane, that may indicate several perigalactic passages of the Sgr dwarf galaxy.
RR Lyrae; galactic structure; Sgr dwarf galaxy; SDSS
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Podaci o prilogu
2003.
objavljeno
Podaci o matičnoj publikaciji
Satellites and Tidal Streams
Podaci o skupu
ING-IAC Conference on Satellites and Tidal Streams
predavanje
26.05.2003-30.05.2003
La Palma del Condado, Španjolska