J/ApJ/842/133ivo://CDS.VizieR/J/ApJ/842/133doi:10.26093/cds/vizier.18420133CDSLeisman L.Haynes M.P.Janowiecki S.Hallenbeck G.Jozsa G.,Giovanelli R.Adams E.A.K.Neira D.B.Cannon J.M.Janesh W.F.,Rhode K.L.Salzer J.J.2018-05-16T06:59:36Z2018-03-07T07:29:00ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyh-i-line-emissionabsolute-magnitudeextinctionphotometrygalaxy-classification-systemsWe present a sample of 115 very low optical surface brightness, highly extended, HI-rich galaxies carefully selected from the ALFALFA survey that have similar optical absolute magnitudes, surface brightnesses, and radii to recently discovered "ultra-diffuse" galaxies (UDGs). However, these systems are bluer and have more irregular morphologies than other UDGs, are isolated, and contain significant reservoirs of HI. We find that while these sources have normal star formation rates for HI-selected galaxies of similar stellar mass, they have very low star formation efficiencies. We further present deep optical and HI-synthesis follow-up imaging of three of these HI-bearing ultra-diffuse sources. We measure HI diameters extending to ~40kpc, but note that while all three sources have large HI diameters for their stellar mass, they are consistent with the HI mass-HI radius relation. We further analyze the HI velocity widths and rotation velocities for the unresolved and resolved sources, respectively, and find that the sources appear to inhabit halos of dwarf galaxies. We estimate spin parameters, and suggest that these sources may exist in high spin parameter halos, and as such may be potential HI-rich progenitors to the ultra-diffuse galaxies observed in cluster environments.2017ApJ...842..133Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/842/133CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/ApJS/105/209 : Low surface brightness galaxies. I. (Impey+ 1996)J/A+A/324/877 : HI properties of spiral & irregular gal. (Broeils+, 1997)J/ApJS/162/49 : UBV imaging of irregular galaxies (Hunter+, 2006)J/AJ/133/2569 : Arecibo legacy fast ALFA survey III. (Giovanelli+, 2007)J/AJ/135/588 : Arecibo legacy fast ALFA survey V. (Saintonge+, 2008)J/AJ/136/713 : Arecibo legacy fast ALFA survey. VI. (Kent+, 2008)J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)J/ApJS/183/214 : Arecibo Legacy Fast ALFA Survey. VIII. (Martin+, 2009)J/AJ/138/338 : Arecibo Legacy Fast ALFA Survey. IX. (Stierwalt+, 2009)J/AJ/142/170 : ALFALFA survey: {alpha}.40 HI source catalog (Haynes+, 2011)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/MNRAS/460/2143 : HI size-mass relation of galaxies (Wang+, 2016)J/ApJS/225/11 : Subaru-UDGs in the Coma cluster (Yagi+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/842/133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/842/133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/842/133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/842/133https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/842/133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/842/133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/842/133/table1 (Properties of HI-bearing ultra-diffuse ALFALFA sources (HUDS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/842/133/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/842/133/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/842/133/table1?GETtext/xml+votable180.050000true344.61211.84970.0055555555555555566/8 722 751 2126 2151 2183 2312 2568 4168 4183 4199 4245 4381 4401 4630 4821 4843 4929 4936 4961 5001 5012 5120 5122 6196 8256 8375 8418 8447 8452 8495 8692 8720 8740 8840 8871 8899 8953 8990 8999 9261 9265 10295 12791 13363 13397 13404 13427 17759 17819 18093 18141 18233 18251 18308 18405 18868 19275 19436 19521 19529 19784 19993 20003 20167 20282 20302 20352 20388 20394 20402 20416 21849 22380 25959 25970 26029 26044 26222 26418 26421 26439 26443 26458 26462 26536 26546 26547 27325 27567 27577 27706 27715 27718 27740 27749 27829 27890 27938 28157 28171 28172 28230 28250 28280 28345 28390 28406 28420 28556 28566 31337 31442 31531https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/842/133?format=asciiRadioOpticaldefaultJ/ApJ/842/133/table1Properties of HI-bearing ultra-diffuse ALFALFA sources (HUDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAGC[102791/749488] Arecibo General Catalog IDmeta.id;meta.mainintRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maincz[1796/8416] Recessional velocitykm/sphys.velocintW50[19/215] Width of the HI line measured at the 50% flux level, corrected for channel broadeningkm/sspect.line.width;em.line.HIinte_W50[2/59] W50 errorkm/sstat.errorintSdV[0.3/3.5] HI line flux densityJy.km/sphot.fluxfloate_SdV[0.02/0.1] Flux density errorJy.km/sstat.errorfloatDist[28/120] Distance from ALFALFA flow model (1)Mpcpos.distance;pos.heliocentricintlogMHI[7.9/9.5] HI masslog(solMass)phys.massfloate_logMHI[0.05/0.2] HI mass error (1)log(solMass)stat.errorfloatmug0[23/25.4] g-band central surface brightness (2)mag.arcsec**-2phot.mag.sbfloate_mug0[0.1/0.4] g-band central SB errormag.arcsec**-2stat.errorfloatrh[1.6/8] Half light radiuskpcphysfloate_rh[0.2/3.3] Half light radius error (1)kpcstat.errorfloatgMAG[-17.1/-13.9] g-band absolute magnitude (3)magphys.magAbsfloate_gMAG[0.3/1.1] gMAG error (1)magstat.errorfloatg-r[-0.2/0.9] g minus r color index (2)magphot.color;em.opt.B;em.opt.Rfloate_g-r[0.1/2] g-r color errormagstat.error;phot.color;em.opt.BfloatAg[0.05/0.8] g band galactic extinction (4)magphys.absorption.galfloatAr[0.03/0.6] r band galactic extinction (4)magphys.absorption.galfloatSetBroad (B) or Restrictive (R) Samplemeta.codecharH11Display ALFALFA data from Haynes+, 2011, J/AJ/142/170 within 30"meta.ref.urlintnullableSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar