J/ApJ/704/898ivo://CDS.VizieR/J/ApJ/704/898doi:10.26093/cds/vizier.17040898CDSSand D.J.Olszewski E.W.Willman B.Zaritsky D.Seth A.Harris J.,Piatek S.Saha A.2023-07-21T15:06:08Z2011-12-08T15:02:32ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryWe present imaging of the recently discovered Hercules Milky Way satellite and its surrounding regions to study its structure, star formation history and to thoroughly search for signs of disruption. We robustly determine the distance, luminosity, size, and morphology of Hercules utilizing a bootstrap approach to characterize our uncertainties. We derive a distance to Hercules via a comparison to empirical and theoretical isochrones, finding a best match with the isochrone of M92, which yields a distance of 133+/-6kpc. As previous studies have found, Hercules is very elongated, with {epsilon}=0.67+/-0.03 and a half-light radius of r_h_~230pc. Using the color-magnitude-fitting package StarFISH, we determine that Hercules is old (>12Gyr) and metal-poor ([Fe/H]~-2.0), with a spread in metallicity, in agreement with previous spectroscopic work. This result is robust with respect to slight variations in the distance to Hercules and mismatches between the observed Hercules color-magnitude diagram and theoretical isochrones. We infer a total absolute magnitude of M_V_=-6.2+/-0.4. Our innovative search for external Hercules structure both in the plane of the sky and along the line of sight yields some evidence that Hercules is embedded in a larger stream of stars. A clear stellar extension is seen to the northwest with several additional candidate stellar overdensities along the position angle of Hercules out to ~35' (~1.3kpc).2009ApJ...704..898Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/704/898CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/704/898https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/704/898http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/704/898https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/704/898https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/704/898http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/704/898GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/704/898/catalog (Combined table from original tables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/704/898/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/704/898/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/704/898/catalog?GETtext/xml+votable180.050000true247.7471812.790460.0055555555555555566/31686-31687 31692-31694https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/704/898?format=asciidefaultJ/ApJ/704/898/catalogCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[LBT/SDSS] Observed by SDSS or LBTmeta.id;instr.obstycharSeqStar identification numbermeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedBmagB band magnitudemagphot.mag;em.opt.Bfloate_BmagError in Bmagmagstat.error;phot.magfloatABB band extinction (1)magphys.absorptionfloatVmagV band magnitudemagphot.mag;em.opt.Vfloatnullablee_VmagError in Vmagmagstat.error;phot.magfloatnullableAVV band extinction (1)magphys.absorptionfloatnullablermagr band magnitudemagphot.mag;em.opt.Rfloate_rmagError in rmagmagstat.error;phot.magfloatArr band extinction (1)magphys.absorptionfloatSloanDisplay the SDSS data for this quasarmeta.ref.urlcharFField number for adjacent fields (no number for central field, values 1--4 for the adjacent fields)obs.fieldcharDR6+7Display the SDSS-DR6 and DR7 data (Adelman-McCarthy et al., Cat. II/282 and II/294)meta.ref.urlchar