J/ApJ/879/22ivo://CDS.VizieR/J/ApJ/879/22doi:10.26093/cds/vizier.18790022CDSDefelippis D.Putman M.Tollerud E.2021-09-30T09:09:25Z2021-01-11T12:38:29ZCDS support team

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

cds-question@unistra.frradio-sourcesh-i-line-emissionsurveysIn recent years, ultrafaint dwarf (UFD) galaxies have been found through systematic searches of large optical surveys. However, the existence of Leo T, a nearby gas-rich dwarf, suggests that there could be other nearby UFDs that are optically obscured but have gas detectable at nonoptical wavelengths. With this in mind, we perform a search of the full Galactic Arecibo L-band Feed Array HI (GALFA-HI) survey, a radio survey that covers one-third of the sky at velocities -650<V_LSR_<+650km/s, for neutral hydrogen sources. We are able to probe regions of the sky at lower Galactic latitudes and smaller |V_LSR_| compared to previous explorations. We use the Source Finding Application on GALFA-HI and select all sources with similar properties to Leo T and other local dwarf galaxies. We find 690 dwarf galaxy candidates, one of which is particularly promising and likely a new galaxy near the Galactic plane (b=-8{deg}) that is comparable in velocity width and HI-flux to other recently discovered local volume galaxies. We find we are sensitive to Leo T-like objects out to 1Mpc at velocities clear from background HI emission. We check each candidate's corresponding optical fields from Pan-STARRS and fit stars drawn from isochrones, but find no evidence of stellar populations. We thus find no other Leo T-like dwarfs within 500 kpc of the Milky Way in the one-third of the sky covered by the GALFA-HI footprint, and discuss our nondetection in a cosmological context.2019ApJ...879...22Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/879/22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/136/713 : Arecibo legacy fast ALFA survey. VI. (Kent+, 2008)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/ApJ/758/44 : The GALFA-HI compact cloud catalog (Saul+, 2012)J/ApJ/768/77 : Ultra-compact high velocity clouds from ALFALFA (Adams+, 2013)J/ApJ/808/136 : UV xids in HI clouds using ALFA surveys (Donovan+, 2015)J/ApJ/812/158 : Leo P RR Lyrae candidates & cumulative SFH (McQuinn+, 2015)J/ApJ/827/89 : HST imaging of Pisces A and B (Tollerud+, 2016)J/ApJS/234/2 : The GALFA-HI survey data release 2 (Peek+, 2018)J/A+A/612/A26 : Deep HI observations of Leo T with WSRT (Adams+, 2018)J/AJ/156/18 : APOGEE DR14: companions of evolved stars (Price-Whelan+, 2018)J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/879/22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/879/22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/879/22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/879/22https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/879/22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/879/22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/879/22/table2 (HI dwarf galaxy candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/879/22/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/879/22/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/879/22/table2?GETtext/xml+votable180.050000true206.07518.426110.0055555555555555566/47 62 145 169 174 214 223 259 265 281 294 307 386-387 391 551 588 620 624 642 670-671 694 699 706 717 766 774 780 782 784 851 971 999 1070 1096 1174 1182 1298 1310 1345 1416 2056 2146 2185 2190-2191 2204 2211 2218 2347 2689 4120 4165 4169 4232 4251 4260 4301 4310-4311 4313 4315 4331 4394 4429 4453 4567 4593 4602 4719 4727 4778 4782 4790 4799 4821 4830 4856 4914 4922 4930-4931 4950 4960 4966 4985 4988-4989 5011 5040 5068-5069 5083-5084 5251 5327 5672 5674 6152 6162 6169 6175 6181 6196 6212 6214 6224 6228 6230 6241 6251 6403 6665 6675 8248 8256 8279 8283 8335 8338 8344 8349-8350 8391 8396 8403 8419 8433 8450-8451 8456-8457 8472 8513 8582 8592 8611 8638 8682 8685 8687-8688 8694 8733 8735 8743 8758 8761 8768 8776 8809 8816 8820 8822 8825 8836 8838 8840 8860 8863 8865 8897 8902 8928 8949 8951 8957 9030 9038 9054 9077 9122 9124 9138 9151 9255 9303 9332 9338 9340 9345 9353 9368 9371-9372 9383 9404 9474 9492 9505 9538-9539 9739 9762 9776 10245 10446 10516 10522 10560 12291 12322 12372 12375 12381 12415 12421 12424 12449 12463 12472 12474 12478 12505 12539 12586 12653 12674 12699 12711 12733 12740 12744 12758 12770 12813 12873 12878 12889 12906 12911 12913 12942 12990 13012 13088 13114 13117 13122 13129 13146 13157 13165 13170 13186 13217 13232 13249 13254 13267 13331 13340 13436 13458 13500 13504 13509 13524 13545 13552 13578 13604 13954 14337 14347 14426 14497 14549 17812 17886 18142 18149 18163 18166 18173 18308 18317 18343 18779 18797 18844 18892 18913 19042 19051 19062 19117 19131 19136 19141 19168 19180 19233 19272 19289 19310 19312 19325 19396 19401 19412 19436 19440 19452 19481 19496 19537 19631 19643 19688 19915 19947 19966 19979 19998 20000 20019 20021 20025 20038 20077 20083 20201 20204 20257 20347 20419 21911 21940 21946 21978 21995 22219-22220 22312 22339 22364 22372 22383 22396 22411 22522 22783 22847 22956 22963 22996 23011 23129 23134 23270 23313 23316 23331 23348 23351 23360 23363-23364 23390 23392 23395 23403 23406 23413 23416-23417 23422 23461 23465 23478 23489-23492 23496 23533 23556 23594 23626 23631 23639-23641 23654-23655 23681 23734 23746 23766 23787 23791 23794 23798 23811 23824 23850 23852 23870 23884 23895 23900 23928 23936 23968 23983 24064 24075 24081 24098 24108 24113 24128 24262 24271 24273 24308 24314 24316 24346 24360 24362 24369 24376 24390 24410 24425 24466 24516 24524 25983 26100 26253 26261 26264 26294 26312 26314 26336 26352 26412 26479-26481 26496 26514 26529 26531 26562 26566 26596 26617 26620 26986 26990 27243 27293 27329 27424 27502 27519 27529 27533 27556-27557 27623 27685-27686 27898 27930 27969 28034 28073 28130 28233 28240 28266 28317 28350 30015 30054 30063 30066-30067 30102 30110-30111 30133 30151 30160 30168 30200 30319 30366 30379 30438 30455 30457 30478 30495 30537 30577 30590 30600-30601 30615 30619 30676 31067 31076-31077 31079 31090-31092 31094 31145 31169 31182 31187 31189-31190 31204 31219 31223-31224 31226 31319 31379 31429 31470 31483-31484 31552 31561 31568 31580 31591 31600 31605 31662 31688 31698 31702 31706-31708 31736 31745 31759 31778 31782 31785 31791 31795 31798 31806 31809 31817 31823 31891 31901 31932 31934 31936 31939-31940 31951 31969 31977 31986 31989 32014 32032 32142 32186 32188 32233 32235 32261 32267 32270 32277 32282 32289 32294 32301 32324-32325 32329 32354 32356 32368 32382-32383 32404 32422 32457 32465 32467-32468 32470 32472 32476 32487 32499 32501 32516 32518 32530-32531 32536 32546-32548 32550 32560 32563 32568 32570 32619 32627 32632 32636 32644 32650 32667 32669 32673 32675-32676 32679-32680 32682-32685 32687 32693 32697 32699-32700 32706 32714 32717 32726 32732 32753https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/879/22?format=asciiRadiodefaultJ/ApJ/879/22/table2HI dwarf galaxy candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDGalaxy identifier (LLL.ll+BB.bb+NNN; with +NNN=Vlsr)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainSize[4/8] Major axis of fitted ellipse (2)arcminphys.angSize;meta.modelledfloatSNR[30/226] Signal to noise ratio (3)stat.snrintFint[0.5/15.7] Integrated source HI flux (3)Jy.km/sphot.flux.density;em.line.HIfloatTB[0.4/3.1] Peak brightness temperature (identical to f_peak in the Source Finding Application (SoFiA))Kphys.temperature;stat.maxfloatw50[10/49] Line width at 50% peak flux densitykm/sspect.line.widthintVlsr[-415/358] Local Standard of Rest velocity at the source's flux-weighted centerkm/sphys.veloc;pos.lsrint