J/ApJ/756/23ivo://CDS.VizieR/J/ApJ/756/23doi:10.26093/cds/vizier.17560023CDSAkhter S.Da Costa G.S.Keller S.C.Schmidt B.P.2017-12-05T05:10:48Z2014-04-28T07:50:47ZCDS support team

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

cds-question@unistra.frvisible-astronomyWide-band photometryvariable-starsmilky-way-galaxyhalo-starsWe investigate the steepening of the power-law slope beyond the Galactocentric radius of R~45kpc in the RR Lyrae (RRL) space density distribution found by Keller et al. (2008, Cat. J/ApJ/678/851). They identified 2016 RRL candidates derived from the analysis of archival observations of the Southern Edgeworth-Kuiper Belt Object (SEKBO) survey. Our aim is to verify the completeness of RRLs and ultimately the space density distribution function given by Keller et al. We followed up on a subset of 137 candidates with a range of magnitudes (V~14-20) using the Faulkes Telescope (FT) database and confirmed 57 candidates as real RRLs. A cross-match between SEKBO RRL survey and Sloan Digital Sky Survey Data Release-7 (SDSS DR-7) revealed 272 RRL candidates in common. Applying the color selection criteria proposed by Ivezi\'c et al. (2005AJ....129.1096I) resulted in 193 likely RRLs. The completeness as a function of magnitude was calculated empirically from the combined set of SEKBO RRL candidates from current FT data, SDSS cross-matched data, and the Prior et al. catalog (2009, Cat. J/ApJ/691/306). This resulted in a spatial density distribution characterized by two power laws with a break radius R within a range between 45kpc and 50kpc, similar to the results of Keller et al. We find the power-law slopes for the inner halo as n_inner_=-2.78+/-0.02 and for the outer halo as n_outer_=-5.0+/-0.2.2012ApJ...756...23Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/756/23CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/427/3374 : QUEST RR Lyrae Survey III. Low Galactic lat. (Mateu+, 2012)J/ApJ/731/4 : Galactic halo as seen by the CFHTLS (Sesar+, 2011)J/ApJ/714/663 : Stellar density map of the Milky Way (de Jong+, 2010)J/ApJ/708/717 : Light curve templates of RR Lyrae stars (Sesar+, 2010)J/ApJ/691/306 : Phot. of RR Lyrae candidates in Virgo stream (Prior+, 2009)J/ApJ/678/865 : LONEOS-I RR Lyrae stars (Miceli+, 2008)J/ApJ/678/851 : RR Lyrae survey in the Galactic Halo (Keller+, 2008)J/AJ/136/1645 : Spectroscopy of bright QUEST RR Lyrae stars (Vivas+, 2008)J/MNRAS/375/1381 : Kinematics of RR Lyr and HB stars in NGP (Kinman+, 2007)J/AJ/127/1158 : QUEST RR Lyrae Survey first catalog (Vivas+, 2004)J/AJ/115/193 : RR Lyrae V light curves (Layden, 1998)J/AcA/48/113 : OGLE RR Lyrae VI photometry (Udalski, 1998)J/A+AS/113/483 : Phot. and radial velocity of RRLyr stars (Carrillo+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/756/23https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/756/23http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/756/23https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/756/23https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/756/23http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/756/23GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/756/23/table2 (Positions and derived parameters for confirmed RR Lyrae variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/756/23/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/756/23/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/756/23/table2?GETtext/xml+votable180.050000true6.3024583-3.52493060.0055555555555555566/101 127 184 317 341 384 388 515 523 4736 17134 17870 17968 18049 18275 18290 18741 22383 22468 25697 25825 48317 48360 48378 48446 48447 48486 48494 48501 48531 48545 48546 48550 48565 48567 48571 48576 48579 48582 48584 48591 48600 48608 48726 48764 48910 48911 48918 48923 48935 48946 48965 48968https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/756/23?format=asciiOpticaldefaultJ/ApJ/756/23/table2Positions and derived parameters for confirmed RR Lyrae variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[KMP2008]Object identificationmeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainClassRR Lyrae classification ("RRLab" or "RRLc")meta.code;src.varcharNobs[5/27] Number of observationsmeta.numberintVmag2[15/19.8] V band magnitude from Keller et al. (SEKBO survey; 2008, Cat. J/ApJ/678/851)magphot.mag;em.opt.VfloatVmag[15.1/19.8]? V band magnitude from the current study (FT data)magphot.mag;em.opt.VfloatnullableVdiff[-0.5/0.3]? V band magnitude difference (V_SEKBO_-V_FT_)magphot.mag;arith.difffloatnullablePer[0.2/0.8] Period from the current studydtime.periodfloatVamp[0.3/1.4] V band amplitude from the current studymagsrc.var.amplitudefloatPer2[0.2/0.7]? Period from Prior et al. (P09; 2009, Cat. J/ApJ/691/306)dtime.periodfloatnullableVamp2[0.3/1.2]? V band amplitude from P09magsrc.var.amplitudefloatnullableP09Display the data from Priors et al. 2009, Cat. J/ApJ/691/306meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar