J/ApJ/722/395ivo://CDS.VizieR/J/ApJ/722/395doi:10.26093/cds/vizier.17220395CDSBegum A.Stanimirovic S.Z.Peek J.E.Ballering N.P.Heiles C.,Douglas K.A.Putman M.Gibson S.J.Grcevich J.Korpela E.J.Lee M.-Y.,Saul D.Gallagher III J.S.2017-09-11T08:52:29Z2017-08-22T12:44:12ZCDS support team

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

cds-question@unistra.frmilky-way-galaxymolecular-cloudsinterstellar-mediumh-i-line-emissionThe Galactic Arecibo L-band Feed Array H I (GALFA-H I) survey is mapping the entire Arecibo sky at 21 cm, over a velocity range of -700 to +700 km/s (LSR), at a velocity resolution of 0.18 km/s, and a spatial resolution of 3.5 arcmin. The unprecedented resolution and sensitivity of the GALFA-H I survey have resulted in the detection of numerous isolated, very compact H I clouds at low Galactic velocities, which are distinctly separated from the H I disk emission. In the limited area of ~4600 deg^2^ surveyed so far, we have detected 96 such compact clouds. The detected clouds are cold with a median T_k,max_ (the kinetic temperature in the case in which there is no non-thermal broadening) of 300 K. Moreover, these clouds are quite compact and faint, with median values of 5 arcmin in angular size, 0.75 K in peak brightness temperature, and 5x10^18^/cm2 in H I column density. Most of the clouds deviate from Galactic rotation at the 20-30 km/s level, and a significant fraction show evidence for a multiphase medium and velocity gradients. No counterparts for these clouds were found in other wave bands. From the modeling of spatial and velocity distributions of the whole compact cloud population, we find that the bulk of the compact clouds are related to the Galactic disk, and their distances are likely to be in the range of 0.1 to a few kpc. We discuss various possible scenarios for the formation and maintenance of this cloud population and its significance for Galactic interstellar medium studies.2010ApJ...722..395Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/722/395CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HIJ/ApJ/688/290 : GASS HI survey of the lower halo (Ford+, 2008)J/AJ/142/170 : ALFALFA survey: {alpha}.40 HI source (Haynes+, 2011)J/ApJ/758/44 : The GALFA-HI compact cloud catalog (Saul+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/722/395https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/722/395http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/722/395https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/722/395https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/722/395http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/722/395GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/722/395/table1 (The Compact Cloud with Derived Gaussian Parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/722/395/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/722/395/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/722/395/table1?GETtext/xml+votable180.050000true2.1916729.1250.0055555555555555566/217 241 545 763 879 911 914 923 961 963 2092 2097 2107 2108 2131 2564 2576 4375 4933 4949 6195 6223 8223 8229 8245 8247 8301 9030 9040 9280 10381 10383 10386 10387 12565 12604 12612 12617 12619 12639 12658 12661 12666 12695 12699 12736 12756 12762 12768 12773 12779 12780 13355 13398 13399 13428 13429 13438 13593 13826 13844 13846 17886 19157 19277 19410 19636 19647 19747 19986 20084 20089 20090 20092 20210 20219 20322 20323 20390 20395 21980 22362 22363 26418 27746 31511 31527 31584 31632https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/722/395?format=asciiRadiodefaultJ/ApJ/722/395/table1The Compact Cloud with Derived Gaussian ParametersGLONGalactic longitudedegpos.galactic.lonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloud[1/96] Cloud catalog numbermeta.idintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainGLATGalactic latitudedegpos.galactic.latfloatthetaSize estimated as the geometrical mean of the measured angular extent along the major and minor axes (1)arcminphys.angSize;stat.meanfloatVLSR1Central LSR velocity of the fitted Gaussian components (2)km/sphys.veloc;pos.lsrfloatVLSR2? Central LSR velocity of the fitted Gaussian components (2)km/sphys.veloc;pos.lsrfloatnullableDeltaV1Velocity FWHM line width of the fitted Gaussian components (2)km/sspect.line.widthfloatDeltaV2? Velocity FWHM line width of the fitted Gaussian components (2)km/sspect.line.widthfloatnullableTpk1Peak brightness temperature of the fitted Gaussian components (2)Kphys.temperature;stat.maxfloatTpk2? Peak brightness temperature of the fitted Gaussian components (2)Kphys.temperature;stat.maxfloatnullableNHIH I column density (3)1e+18cm**-2phys.columnDensityfloat