J/ApJ/731/4ivo://CDS.VizieR/J/ApJ/731/4doi:10.26093/cds/vizier.17310004CDSSesar B.Juric M.Ivezic Z.2012-12-08T21:57:46Z2012-11-20T12:43:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvisible-astronomysloan-photometryhalo-starssurveysWe use Canada-France-Hawaii Telescope Legacy Survey data for 170deg^2^, recalibrated and transformed to the Sloan Digital Sky Survey ugri photometric system, to study the distribution of near-turnoff main-sequence stars in the Galactic halo along four lines of sight to heliocentric distances of ~35kpc. We find that the halo stellar number density profile becomes steeper at Galactocentric distances greater than R_gal_~28kpc, with the power-law index changing from n_inner_=-2.62+/-0.04 to n_outer_=-3.8+/-0.1. In particular, we test a series of single power-law models and find them to be strongly disfavored by the data. The parameters for the best-fit Einasto profile are n=2.2+/-0.2 and R_e_=22.2+/-0.4kpc. We measure the oblateness of the halo to be q=c/a=0.70+/-0.01 and detect no evidence of it changing across the range of probed distances. The Sagittarius stream is detected in the l=173{deg} and b=-62{deg} direction as an overdensity of [Fe/H]~-1.5dex stars at R_gal_~32kpc, providing a new constraint for the Sagittarius stream and dark matter halo models. We also detect the Monoceros stream as an overdensity of [Fe/H]>-1.5dex stars in the l=232{deg} and b=26{deg} direction at R_gal_<~25kpc. In the two sight lines where we do not detect significant substructure, the median metallicity is found to be independent of distance within systematic uncertainties ([Fe/H]~-1.5+/-0.1dex).2011ApJ...731....4Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/731/4CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)J/A+A/509/A81 : Candidate clusters detected in six CFHTLS fields (Adami+,J/A+A/494/845 : Galaxy clusters in the CFHTLS (Grove+, 2009)J/ApJ/633/630 : Low-mass stars found in CFHTLS (Willott+, 2005)http://www1.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/community/CFHTLS-SG/docs/cfhtlswide.html : CFHTLS Wide Field stacked images and catalogueshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/731/4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/731/4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/731/4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/731/4https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/731/4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/731/4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/731/4/table3{Delta}^total^_j,f_ values for the CFHTLS fieldsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPointPointing identification (1)meta.id;obscharu*The u* band {Delta}^total^_j,f_ value (3)magphot.mag;arith.difffloatg'The g' band {Delta}^total^_j,f_ value (3)magphot.mag;arith.difffloatr'The r' band {Delta}^total^_j,f_ value (3)magphot.mag;arith.difffloati'The i' band {Delta}^total^_j,f_ value (3)magphot.mag;arith.difffloatf_i'[*] i'_2_ band used (2)meta.codechar