The QUEST RR Lyrae Survey: Confirmation of the Clump at 50 kpc and Other Over-Densities in the Outer Halo

Simple item page
dc.creatorVivas, A. K.
dc.creatorZinn, R.
dc.creatorAndrews, P.
dc.creatorBailyn, C.
dc.creatorBaltay, C.
dc.creatorCoppi, P.
dc.creatorEllman, N.
dc.creatorGirard, T.
dc.creatorRabinowitz, D.
dc.creatorSchaefer, B.
dc.creatorShin, J.
dc.creatorSnyder, J.
dc.creatorSofia, S.
dc.creatorvan Altena, W.
dc.creatorAbad, C.
dc.creatorBongiovanni, A.
dc.creatorBriceno, C.
dc.creatorBruzual, G.
dc.creatorDella Prugna, F.
dc.creatorHerrera, D.
dc.creatorMagris, G.
dc.creatorMateu, J.
dc.creatorPacheco, R.
dc.creatorSanchez, Ge.
dc.creatorSanchez, Gu.
dc.creatorSchenner, H.
dc.creatorStock, J.
dc.creatorVicente, B.
dc.creatorVieira, K.
dc.creatorFerrin, I.
dc.creatorHernandez, J.
dc.creatorGebhard, M.
dc.creatorHoneycutt, R.
dc.creatorMuffson, s.
dc.creatorMusser, J.
dc.creatorRengstorf, A.
dc.date2001-05-08
dc.date.accessioned2026-07-07T13:13:08Z
dc.date.available2026-07-07T13:13:08Z
dc.descriptionWe have measured the periods and light curves of 148 RR Lyrae variables from V=13.5 to 19.7 from the first 100 sq. degrees of the QUEST RR Lyrae survey. Approximately 55% of these stars belong to the clump of stars detected earlier by the Sloan Digital Sky Survey. According to our measurements, this feature has ~10 times the background density of halo stars, spans at least 37.5 deg by 3.5 deg in right ascension and declination (>=30 by >=3 kpc), lies ~50 kpc from the Sun, and has a depth along the line of sight of ~5 kpc (1 sigma). These properties are consistent with the recent models that suggest it is a tidal stream from the Sgr dSph galaxy. The mean period of the type ab variables, 0.58 d, is also consistent. In addition, we have found two smaller over-densities in the halo, one of which may be related to the globular cluster Pal 5.
dc.description12 pages (including 4 figures). Accepted for publication in the ApJ Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/0105135
dc.identifierhttp://arxiv.org/abs/astro-ph/0105135
dc.identifierAstrophys.J.554:L33-L36,2001
dc.identifierdoi:10.1086/320915
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229792
dc.subjectAstrophysics
dc.titleThe QUEST RR Lyrae Survey: Confirmation of the Clump at 50 kpc and Other Over-Densities in the Outer Halo
dc.typetext

Files

Collections

arXiv