Naslov
Halo Structure Traced by SDSS RR Lyrae

Autori
Ivezić, Željko ; Lupton, Robert, Schlegel, David ; Smolčić, Vernesa ; Johnston, David ; Gunn, Jim ; Knapp, Gill ; Strauss, Michael, Rockosi, Constance

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Satellites and Tidal Streams / - , 2003

Skup
ING-IAC Conference on Satellites and Tidal Streams

Mjesto i datum
La Palma del Condado, Španjolska, 26.05.2003. - 30.05.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
RR Lyrae; galactic structure; Sgr dwarf galaxy; SDSS

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA