J/ApJ/765/26ivo://CDS.VizieR/J/ApJ/765/26doi:10.26093/cds/vizier.17650026CDSShim H.Chary R.-R.2017-10-09T13:33:34Z2014-11-21T13:07:17ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyline-intensitiesredshiftedultraviolet-astronomyStrong H{alpha} emitters (HAEs) dominate the z~4 Lyman-break galaxy (LBG) population. We have identified local analogs of these HAEs using the Sloan Digital Sky Survey. At z<0.4, only 0.04% of the galaxies are classified as HAEs with H{alpha} equivalent widths (>~500{AA}) comparable to that of z~4 HAEs. Local HAEs have lower stellar mass and lower ultraviolet (UV) luminosity than z~4 HAEs, yet the H{alpha}-to-UV luminosity ratio, as well as their specific star formation rate, is consistent with that of z~4 HAEs, indicating that they are scaled-down versions of high-z star-forming galaxies. Compared to the previously studied local analogs of LBGs selected using rest-frame UV properties, local HAEs show similar UV luminosity surface density, weaker D_n_(4000) break, lower metallicity, and lower stellar mass. This implies that the local HAEs are less evolved galaxies than the traditional Lyman break analogs. In the stacked spectrum, local HAEs show a significant He II{lambda}4686 emission line suggesting a population of hot, massive stars similar to that seen in some Wolf-Rayet galaxies. Low [N II]/[O III] line flux ratios imply that local HAEs are inconsistent with being systems that host bright active galactic nuclei. Instead, it is highly likely that local HAEs are galaxies with an elevated ionization parameter, either due to a high electron density or large escape fraction of hydrogen ionizing photons as in the case of Wolf-Rayet galaxies.2013ApJ...765...26Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/765/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)J/MNRAS/421/1043 : Emission-line galaxies from SDSS DR7 (Shirazi+, 2012)J/ApJS/173/441 : UV-Luminous galaxies discovered by GALEX (Hoopes+, 2007)J/ApJ/655/851 : Wolf-Rayet galaxies in the SDSS (Zhang+, 2007)J/ApJ/647/128 : H{alpha} observations of UV-selected galaxies (Erb, 2006)J/ApJS/161/240 : High-ionization emission in metal-deficient BCD (Thuan+, 2005)J/ApJS/132/37 : Spectroscopy of Southern warm IR galaxies (Kewley+, 2001)http://www.mpa-garching.mpg.de/SDSS/DR7 : MPA-JHU catalog for SDSS-DR7https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/765/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/765/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/765/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/765/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/765/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/765/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/765/26/table1 (Local strong H{alpha} emitters (HAEs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/765/26/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/765/26/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/765/26/table1?GETtext/xml+votable180.050000true5.91509194-9.813521940.0055555555555555566/29 3965 4096 4109 4179 4251 4253 4285 4298 4394 4417 4441 4464 4470 4487 4516 4602 4685 4694 4707 4730 4773 4806 4843 4871 4947 5026 5084 5174 5203 5246 5278 5343 5359 5578 5592 5624 5646 5690 5715 5738 5742 5764 5814 5927 6005 6010 6027 6105 6128 6164 6169 6256 6258 6385 6419 6433 6470 6559 7172 7173 7185 7210 7252 7281 7304 7315 7371 7381 8232 8321 8328 8466 8489 8492 8539 8552 8558 8565 8591 8657 8766 8780 8791 8872 8886 8897 8914 8969 8979 9037 9039 9054 9152 9182 9208 9407 9408 9481 9825 9863 9931 9973 10086 10104 10106 10200 10251 10274 10312 10343 10348 10431 10441 10459 10494 10495 10497 10524 10527 10601 10666 10690 10773 10809 10815 10818 10881 10937 10951 10980 11009 11033 11051 11098 11101 11108 11115 11126 11177 11196 11211 11246 11269 11275 11281 11283 11302 11364 11389 11433 11434 11436 11460 11466 11480 11841 12383 17242 17559 17661 17755 17758 17773 17816 17818 17832 18027 18034 18061 18066 18067 18388 18392 18767 18780 18844 18881 19028 19033 19035 19057 19118 19417 19762 19943 21877 21970 22719 23138 23195 23196 23204 23206 23207 23214 23234 25839 25851 25927 25938 25960 25971 25976 26014 26087 26162 26165 26200 26223 26260 26313 26344 26346 26362 26370 26423 26588 26611 26617 26964 26974 27038 27053 27079 27199 27243 27260 27291 27333 27409 27431 27446 27494 27516 27525 27575 27581 27604 27654 27661 27691 27719 27735 27765 27855 27856 27884 27904 27911 27953 28028 28034 28089 28221 28240 28290 28335 28341 28363 28396 28432 28460 28476 28520 28524 28585 28597 28598 28607 28635 28643 28647 31316 31387 31436 31437 31473 31487 31630 31641 31679 31694 31725 31728 31738 36727 36762 36779 36785 36801 36808 36861 49016 49101https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/765/26?format=asciiUVOpticaldefaultJ/ApJ/765/26/table1Local strong H{alpha} emitters (HAEs)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobjIDSDSS identifiermeta.id;meta.mainRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[0.0009/0.4] Redshift (1)src.redshiftdoubleW(Ha)[500/2271] H{alpha} equivalent width; in Angstroms (1)0.1nmspect.line.eqWidth;em.line.Halphafloatf(Ha)H{alpha} line flux (10^-17^erg/s/cm^2^) (1)1e-20W.m**-2phot.flux;em.line.Halpha;spect.linefloatlogIFUV? FUV luminosity surface density (2)log(solLum.kpc**-2)phys.luminosityfloatnullablelogSFRStar formation rate (1)log(solMass.yr**-1)phys.SFRfloatlogM*[6/9.8]? Log of stellar mass (1)log(solMass)phys.massfloatnullable[O/H][7.6/9.3]? Oxygen abundance 12+log[O/H] (1)phys.abundfloatnullableDn4000Strength of the 4000{AA} break (1)spect.indexfloatWR[WR ] if matched with Wolf-Rayet galaxies (Brinchmann et al. 2008MNRAS.385..769B)meta.notecharSloanDisplay the online SDSS data for this galaxymeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar