J/AJ/143/133ivo://CDS.VizieR/J/AJ/143/133doi:10.26093/cds/vizier.51430133CDSHuang S.Haynes M.P.Giovanelli R.Brinchmann J.Stierwalt S.,Neff S.G.2013-08-20T15:52:44Z2013-07-12T16:08:37ZCDS support team

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

cds-question@unistra.frradio-galaxiesultraviolet-photometryvisible-astronomysloan-photometryh-i-line-emissionWe examine the global properties of the stellar and HI components of 229 low HI mass dwarf galaxies extracted from the ALFALFA survey ({alpha}.40; Haynes et al., 2011, Cat. J/AJ/142/170), including a complete sample of 176 galaxies with HI masses<10^7.7^M_{sun}_and HI line widths<80km/s. Sloan Digital Sky Survey (SDSS; Cat . II/294 superseded by Cat. V/139) data are combined with photometric properties derived from Galaxy Evolution Explorer (GALEX; GR5, Cat. II/312) to derive stellar masses (M_*_) and star formation rates (SFRs) by fitting their UV-optical spectral energy distributions (SEDs). In optical images, many of the ALFALFA dwarfs are faint and of low surface brightness; only 56% of those within the SDSS footprint have a counterpart in the SDSS spectroscopic survey. A large fraction of the dwarfs have high specific star formation rates (SSFRs), and estimates of their SFRs and M_*_ obtained by SED fitting are systematically smaller than ones derived via standard formulae assuming a constant SFR. The increased dispersion of the SSFR distribution at M_*_<~10^8^M_{sun}_ is driven by a set of dwarf galaxies that have low gas fractions and SSFRs; some of these are dE/dSphs in the Virgo Cluster. The imposition of an upper HI mass limit yields the selection of a sample with lower gas fractions for their M_*_ than found for the overall ALFALFA population. Many of the ALFALFA dwarfs, particularly the Virgo members, have HI depletion timescales shorter than a Hubble time. An examination of the dwarf galaxies within the full ALFALFA population in the context of global star formation (SF) laws is consistent with the general assumptions that gas-rich galaxies have lower SF efficiencies than do optically selected populations and that HI disks are more extended than stellar ones.2012AJ....143..133Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/133CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)J/A+A/544/A65 : GALEX Arecibo SDSS survey. VI. (Catinella+, 2012)J/A+A/527/A109 : Dust and PAH emission SEDs of disk galaxies (Popescu+, 2011)J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)J/AJ/142/170 : ALFALFA survey: the a.40 HI source catalog (Haynes+, 2011)J/AJ/139/315 : HI-selected galaxies in SDSS. Optical data (West+, 2010)J/ApJ/706/599 : H{alpha} and UV SFR in the local volume (Lee+, 2009)J/AJ/138/338 : Arecibo legacy fast ALFA survey IX. (Stierwalt+, 2009)J/ApJS/173/293 : UV-Optical galaxy color-magnitude diagram I. (Wyder+, 2007)J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/133https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/143/133/table1 (Properties of ALFALFA dwarf sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/143/133/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/143/133/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/143/133/table1?GETtext/xml+votable180.050000true0.08916731.0219440.0055555555555555565/6965 6/727 733 806 814 900 901 904 907 920 932 944 2079 2093 2119 2120 2122 2130 2144 4196 4197 4271 4313 4324 4353 4373 4381 4401 4424 4638 4650 4652 4887 4928 5008 5168 5171 5176 5180 5280 8309 8320 8362 8458 8744 8936 9243 10265 10266 10278 10314 13377 13398 13403 13415 13447 18393 18394 18398 19667 19678 19945 19990 20217 20268 20271 20277 20282 20416 21976 22348 22356 22364 22379 22387 26047 26322 26323 26326 26331 26332 26349 26354 26356 26360 26362 26365 26407 26446 26456 26461 26494 26500 26541 26558 26562 26595 27098 27100 27130 27132 27135 27351 27382 27407 27410 27417 27423 27429 27441 27475 27479 27482 27487 27505 27510 27513 27514 27515 27518 27588 27593 27594 27596 27597 27600 27603 27604 27611 27613 27677 27686 27713 27714 27715 27716 27718 27720 27722 27723 27724 27725 27728 27729 27730 27735 27736 27739 27743 27745 27761 27769 27771 27772 27773 27775 27818 27826 27828 27838 27841 27851 27856 27884 27885 27904 27913 27920 27926 27946 27951 28032 28035 28125 28126 28142 28147 28152 28153 28160 28163 28165 28166 28168 28170 28172 28173 28178 28180 28181 28186 28188 28200 28207 28208 28225 28389 28411 28437 28439 28444 28460 28486 28487 284917.447298006782415e-19 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/143/133?format=asciiUVOpticalRadiodefaultJ/AJ/143/133/table1Properties of ALFALFA dwarf samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUGC/AGCALFALFA catalog identifier (AGC number) (1)meta.id;meta.mainintf_UGC/AGC[*] poor SED fitting (2)meta.codecharRAJ2000Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (3)pos.eq.dec;meta.mainf_FUV[d] Flag in FUV (d=non-detection)phot.mag;em.UVcharFUV[13.66/22.09]? GALEX FUV band magnitude (4)magphot.mag;em.UVfloatnullablee_FUV? Uncertainty in FUV (4)magphot.mag;em.UVfloatnullableNUV[13.44/22.04]? GALEX NUV band magnitude (4)magphot.mag;em.UVfloatnullablee_NUV? Uncertainty in NUV (4)magphot.mag;em.UVfloatnullablermag? SDSS-DR7 pipeline r band modelmag magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? Uncertainty in rmagmagstat.error;phot.mag;em.opt.Rfloatnullableu-r[0.3/3.78]? SDSS-DR7 pipeline (u-r) color indexmagphot.color;em.opt.U;em.opt.Rfloatnullablee_u-r? Uncertainty in u-rmagstat.errorfloatnullablesFlagFlag in SDSS-DR7 photometry quality (5)meta.code.qual;photcharDist[0.9/47.4] Adopted distanceMpcpos.distance;pos.heliocentricfloate_DistUncertainty in DistMpcstat.errorfloatlogMHI[6.11/9.04] Log of HI mass (6)log(solMass)phys.massfloate_logMHIUncertainty in logMHI (6)log(solMass)stat.errorfloatlogM*[5.31/9.52]? Log of stellar mass, derived from SED fitting (see Section 4.2)log(solMass)phys.massfloatnullablee_logM*? Uncertainty in logM*log(solMass)stat.errorfloatnullablelogSFR[-4.17/-0.92]? Log of the star formation rate (see Section 4.5)log(solMass.yr**-1)meta.idfloatnullablee_logSFR? Uncertainty in logSFRlog(solMass.yr**-1)stat.error;phys.SFRfloatnullableSDSSCross-match with SDSS-DR7 and -DR9 within 5"meta.ref.urlintnullable