Halo Streams In The Seventh Sloan Digital Sky Survey Data Release

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dc.contributor.utaustinauthorPrieto, Carlos Allendeen_US
dc.creatorKlement, R.en_US
dc.creatorRix, Hans-Walteren_US
dc.creatorFlynn, C.en_US
dc.creatorFuchs, B.en_US
dc.creatorBeers, Timothy C.en_US
dc.creatorPrieto, Carlos Allendeen_US
dc.creatorBizyaev, Dmitryen_US
dc.creatorBrewington, Howarden_US
dc.creatorLee, Y. S.en_US
dc.creatorMalanushenko, Elenaen_US
dc.creatorMalanushenko, Viktoren_US
dc.creatorOravetz, Danen_US
dc.creatorPan, K.en_US
dc.creatorFiorentin, P. R.en_US
dc.creatorSimmons, Audreyen_US
dc.creatorSnedden, Stephanieen_US
dc.date.accessioned2016-04-28T19:37:57Z
dc.date.available2016-04-28T19:37:57Z
dc.date.issued2009-06en
dc.description.abstractWe have detected stellar halo streams in the solar neighborhood using data from the seventh public data release of the Sloan Digital Sky Survey (SDSS), which includes the directed stellar program Sloan Extension For Galactic Understanding and Exploration (SEGUE). In order to derive distances to each star, we used the metallicity-dependent photometric parallax relation from Ivezic et al. We examine and quantify the accuracy of this relation by applying it to a set of globular and open clusters observed by the SDSS/SEGUE and comparing the resulting sequence to the fiducial cluster sequences obtained by An et al. Our final sample consists of 22,321 nearby (d <= 2 kpc), metal-poor ([Fe/H] <= -0.5) main-sequence stars with six-dimensional estimates of position and space velocity ((r) over bar, (v) over bar). We characterize the orbits of these stars through suitable kinematic proxies for their "effective" integrals of motion, angular momentum, eccentricity, and orbital polar angle and compare the observed distribution to expectations from a smooth distribution in four [Fe/H] bins. The metallicities provide an additional dimension in parameter space that is well suited to distinguish tidal streams from those of dynamical origin. On this basis, we identify at least five significant "phase-space overdensities" of stars on very similar orbits in the solar neighborhood to which we can assign unambiguously peaked [Fe/H] distributions. Three of them have been identified previously, including the halo stream discovered by Helmi et al. at a significance level of sigma = 12.0. In addition, we find at least two new genuine halo streams, judged by their kinematics and [Fe/H], at sigma = 2.9 and 4.8, respectively. For one stream the stars even show coherence in the configuration space, matching a spatial overdensity of stars found by Juric et al. at (R, z) approximate to (9.5, 0.8) kpc. Our results demonstrate the practical power of our search method to detect substructure in the phase-space distribution of nearby stars without making a priori assumptions about the detailed form of the gravitational potential.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipJINA PHY 02-16783, PHY 08-22648en_US
dc.description.sponsorshipELSA MRTN-CT-2006-033481en_US
dc.identifierdoi:10.15781/T2V81Z
dc.identifier.Filename2009_06_halostreams.pdfen_US
dc.identifier.citationKlement, R., H-W. Rix, C. Flynn, B. Fuchs, T. C. Beers, C. Allende Prieto, D. Bizyaev et al. "Halo streams in the seventh sloan digital sky survey data release." The Astrophysical Journal, Vol. 698, No. 1 (Jun., 2009): 865.en_US
dc.identifier.doi10.1088/0004-637x/698/1/865en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34967
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxy: kinematics and dynamicsen_US
dc.subjectsolar neighborhooden_US
dc.subjectstellar velocity distributionen_US
dc.subjectsurvey commissioning dataen_US
dc.subjectphase-spaceen_US
dc.subjectdistributionen_US
dc.subjectmilky-way tomographyen_US
dc.subjectsolar neighborhooden_US
dc.subjectstar streamsen_US
dc.subjectgalactic disksen_US
dc.subjectfine-structureen_US
dc.subjectopen clustersen_US
dc.subjecttidal tailsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHalo Streams In The Seventh Sloan Digital Sky Survey Data Releaseen_US
dc.typeArticleen_US

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