J/ApJ/855/33ivo://CDS.VizieR/J/ApJ/855/33doi:10.26093/cds/vizier.18550033CDSDi Teodoro E.M.McClure-Griffiths N.M.Lockman F.J.Denbo S.R.,Endsley R.Ford H.A.Harrington K.2021-01-25T08:56:18Z2019-01-04T07:29:31ZCDS support team

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

cds-question@unistra.frgalactic-centermolecular-cloudsh-i-line-emissionsurveysWe present the results of a new sensitive survey of neutral hydrogen above and below the Galactic Center with the Green Bank Telescope. The observations extend up to Galactic latitude |b|<10{deg} with an effective angular resolution of 9.5' and an average rms brightness temperature noise of 40mK in a 1km/s channel. The survey reveals the existence of a population of anomalous high-velocity clouds extending up to heights of about 1.5kpc from the Galactic plane and showing no signature of Galactic rotation. These clouds have local standard of rest velocities |V_LSR_|<~360km/s, and assuming a Galactic Center origin, they have sizes of a few tens of parsec and neutral hydrogen masses spanning 10-10^5^M_{sun}_. Accounting for selection effects, the cloud population is symmetric in longitude, latitude, and VLSR. We model the cloud kinematics in terms of an outflow expanding from the Galactic Center and find the population consistent with being material moving with radial velocity V_w_~330km/s distributed throughout a bicone with opening angle {alpha}>140{deg}. This simple model implies an outflow luminosity L_w_>3x10^40^erg/s over the past 10Myr, consistent with star formation feedback in the inner region of the Milky Way, with a cold gas mass-loss rate <~0.1M_{sun}_/yr. These clouds may represent the cold gas component accelerated in the nuclear wind driven by our Galaxy, although some of the derived properties challenge current theoretical models of the entrainment process.2018ApJ...855...33Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/855/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/873 : HIPASS high-velocity clouds (Putman+, 2002)J/ApJ/722/367 : HI clouds in Quadrant I of the Milky Way (Ford+, 2010)J/A+A/510/A54 : NaI and CaII interstellar absorption (Welsh+, 2010)J/ApJ/770/L4 : HI clouds around the Galactic Center (McClure-Griffiths+, 2013)J/ApJS/209/12 : High-velocity clouds from GASS. I. (Moss+, 2013)J/A+A/562/A21 : AGN feedback from CO observations (Cicone+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/855/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/855/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/855/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/855/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/855/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/855/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/855/33/clouds (Cloud observed and derived (model-dependent) properties (tables 1 and 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/855/33/clouds?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/855/33/clouds?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/855/33/clouds?GETtext/xml+votable180.050000true261.3727-26.99420.0055555555555555565/7303 6/28682 28684 28686 28696 28697 28698 28704 28708 28720 28725 28727 28729 28731 28746 28747 28751 28772 28773 28784 28786 28787 28792 28795 28842 28843 28844 28847 28858 28862 28863 28906 28966 28969 28971 29057 29060 29184 29187 29190 29192 29198 29200 29202 29204 29205 29206 29208 29209 29210 29239 29248 29249 29251 29252 29253 29257 29258 29259 29261 29263 29265 29274 29281 29283 29286 29292 29299 29306 29307 42495 42822 42825 42829 42830 42837 42838 42841 42868https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/855/33?format=asciiRadiodefaultJ/ApJ/855/33/cloudsCloud observed and derived (model-dependent) properties (tables 1 and 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameAssigned HI cloud namemeta.id;meta.maincharGLON[0/360] Galactic Longitude cloud centroidsdegpos.galactic.lonGLAT[-7.6/9.8] Galactic latitude cloud centroidsdegpos.galactic.latVLSR[-291/366] LSR velocity (1)km/sphys.veloc;pos.lsrfloatdV[4.2/40.1] FWHM velocity width ({Delta}{nu}) (1)km/sspect.line.widthfloatTbmax[0.07/1.2] Peak brightness temperature (T_b,max_)Kphys.temperature;stat.maxfloatNHImax[0.1/6] Maximum HI column density (N_HI,max_)1e+19cm**-2phys.columnDensity;stat.maxfloatlogMHI8.2[1.1/5.6] Logarithm of HI mass assuming a distance of 8.2kpc (log(M_HI_))log(solMass)phys.massfloatRcl8.2[6.4/53.5] Cloud radius assuming a distance of 8.2kpc (R_cl_)pcphys.size.radiusfloatRef? Previous detections of a cloud (2)meta.bibintnullableflag[m ] m: this cloud can not be reproduced w/modelmeta.code.errorcharx-kpc[-2.4/1.8]? Cartesian X coordinate (3)kpcpos.cartesian.x;pos.galacticfloatnullabley-kpc[-1.3/1.7]? Cartesian Y coordinate (3)kpcpos.cartesian.y;pos.galacticfloatnullablez-kpc[-1.3/1.7]? Cartesian Z coordinate (3)kpcpos.cartesian.z;pos.galacticfloatnullableR[0.5/2.7]? Distance of clouds from the Galactic Center (r)kpcpos.distance;pos.galactocentricfloatnullableDist[6/10.1]? Distance of clouds from the Sun location (D) (4)kpcpos.distance;pos.heliocentricfloatnullablet[1.6/8]? Cloud lifetime, t=r/VwMyrtime.lifetimefloatnullablelogMHI[1.3/5.7]? Cloud HI mass assuming the distance, Distlog(solMass)phys.massfloatnullableRcl[6/59.3]? Cloud radius assuming the distance, Distpcphys.size.radiusfloatnullableTkin[386/35341] Maximum cloud kinetic temperature (5)Kphys.temperature;stat.maxintnHI[0.2/26.1]? Neutral hydrogen number density (6)cm**-3meta.number;phys.densityfloatnullableHICatDisplay data from Putman+ 2002, J/AJ/123/873 and Moss+ 2013, J/ApJS/209/12, within 9.1'meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed