J/ApJ/776/80ivo://CDS.VizieR/J/ApJ/776/80doi:10.26093/cds/vizier.17760080CDSMartin N.F.Ibata R.A.McConnachie A.W.Mackey A.D.Ferguson A.M.N.,Irwin M.J.Lewis G.F.Fardal M.A.2015-05-18T11:23:37Z2015-04-22T14:59:19ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyWe present a generic algorithm to search for dwarf galaxies in photometric catalogs and apply it to the Pan-Andromeda Archaeological Survey (PAndAS). The algorithm is developed in a Bayesian framework and, contrary to most dwarf galaxy search codes, makes use of both the spatial and color-magnitude information of sources in a probabilistic approach. Accounting for the significant contamination from the Milky Way foreground and from the structured stellar halo of the Andromeda galaxy, we recover all known dwarf galaxies in the PAndAS footprint with high significance, even for the least luminous ones. Some Andromeda globular clusters are also recovered and, in one case, discovered. We publish a list of the 143 most significant detections yielded by the algorithm. The combined properties of the 39 most significant isolated detections show hints that at least some of these trace genuine dwarf galaxies, too faint to be individually detected. Follow-up observations by the community are mandatory to establish which are real members of the Andromeda satellite system. The search technique presented here will be used in an upcoming contribution to determine the PAndAS completeness limits for dwarf galaxies. Although here tuned to the search of dwarf galaxies in the PAndAS data, the algorithm can easily be adapted to the search for any localized overdensity whose properties can be modeled reliably in the parameter space of any catalog.2013ApJ...776...80Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/776/80CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/143 : Revised Bologna Catalog of M31 clusters, V.5 (Galleti+ 2012)J/ApJ/768/172 : Kinematic analysis of red giant in M31 dSphs (Collins+, 2013)J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012)J/ApJ/756/79 : Opt. photometry in 3 Local Group dwarf galaxies (Sand+, 2012)J/ApJ/752/45 : SPLASH: Stellar spectro. of M31 satellites (Tollerud+, 2012)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/AJ/133/715 : Dwarf galaxies of the Local Group (Whiting+, 2007)J/A+A/416/917 : Revised Bologna Catalog of M31 GCs (Galleti+, 2004)J/A+AS/127/409 : New nearby dwarf galaxy candidates list (Karachentseva+ 1998)J/AJ/106/986 : CMD for And III (Armandroff+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/776/80https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/776/80http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/776/80https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/776/80https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/776/80http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/776/80GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/776/80/table1 (List of significant detections returned by the algorithm)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/776/80/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/776/80/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/776/80/table1?GETtext/xml+votable180.050000true4.937535.093330.0055555555555555565/641 688 6/2110 2111 2214 2216 2227 2228 2230 2234 2236 2238 2244 2251 2272 2273 2297 2303 2570 2572 2573 2575 2576 2579 2582 2583 2584 2591 2595 2598 2599 2600 2601 2602 2604 2607 2611 2621 2624 2627 2628 2629 2637 2640 2645 2646 2656 2662 2664 2668 2671 2676 2687 2690 2693 2694 2696 2698 2700 2706 2710 2712 2713 2716 2719 2722 2736 2737 2742 2746 2756 2758 2762 2764 2767 2776 2777 2781 2782 2789 2816 2830 2852 2854 13653 13655 20350 20435 20437 20439 20440 20444 20445 20447 20467 20469 20478https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/776/80?format=asciiOpticaldefaultJ/ApJ/776/80/table1List of significant detections returned by the algorithmSeq[1/143] Detection numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainX0[-9/11] Dwarf galaxy center along X (X_0_)degsrc.class.starGalaxy;pos.cartesian.xfloatY0[-13/8.4] Dwarf galaxy center along Y (Y_0_)degpos.cartesian.y;instr.detfloatl_SLimit flag on Smeta.code.errorcharS[3/8.5] Signal valueinstr.sensitivityfloatSth[3/4.6] Detection threshold S_th_stat.likelihood;obsfloatNotesRemarks (nature; location when overlap with known structures)meta.notechar