J/ApJ/924/86ivo://CDS.VizieR/J/ApJ/924/86doi:10.26093/cds/vizier.19240086CDSQu Z.Lindley R.Bregman J.N.2023-11-09T13:04:29Z2023-09-05T16:30:13ZCDS support team

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

cds-question@unistra.frintergalactic-mediummilky-way-galaxyspectroscopyultraviolet-astronomyactive-galactic-nucleiWe compose a 265-sight-line Milky Way CIV line-shape sample using the Hubble Space Telescope/Cosmic Origins Spectrograph archive, which is complementary to the existing SiIV samples. CIV has a higher ionization potential (47-64eV) than SiIV (33-45eV), so it also traces warm gas, which is roughly cospatial with SiIV. The spatial density distribution and kinematics of CIV are identical to those SiIV within ~2{sigma}. CIV is more sensitive to the warm gas density distribution at large radii with a higher element abundance. Applying the kinematical model to the CIV sample, we find two possible solutions of the density distribution, which are distinguished by the relative extension along the disk midplane and the normal-line direction. Both solutions can reproduce the existing sample and suggest a warm gas disk mass of logM(M_{sun}_)~8 and an upper limit of logM(M_{sun}_)<9.3 within 250kpc, which is consistent with SiIV. There is a decrease in the CIV/SiIV column density ratio from the Galactic center to the outskirts by 0.2-0.3dex, which may suggest a phase transition or different ionization mechanisms for CIV and SiIV. Also, we find that the difference between CIV and SiIV is an excellent tracer of small-scale features, and we find a typical size of 5{deg}-10{deg} for possible turbulence within individual clouds (~1kpc).2022ApJ...924...86Qhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/924/86CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJS/146/125 : O VI in the galactic halo (Savage+, 2003)J/ApJS/168/213 : Ionization states and cooling efficiencies (Gnat+, 2007)J/ApJS/176/59 : FUSE survey of OVI in the disk of the MW (Bowen+, 2008)J/ApJ/702/1472 : HI, AlIII, SiIV, CIV, OVI column densities (Savage+, 2009)J/ApJ/749/157 : FUV spectra of Galactic corona sight lines (Wakker+, 2012)J/ApJS/217/21 : XMM-Newton survey of local OVII absorbers (Fang+, 2015)J/ApJ/814/40 : Nearby galaxy filaments with UV obs. (Wakker+, 2015)J/ApJS/228/11 : Time-dependent cooling in photoionized plasma (Gnat, 2017)J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)J/ApJ/871/35 : HST/COS spectra of QSOs with SiIV data (Zheng+, 2019)J/other/NatAs/4.1072 : HaloSat survey of southern Galactic halo (Kaaret+, 2020)J/ApJ/900/9 : AMIGA: Circumgalactic Medium of Andromeda (Lehner+, 2020)J/ApJ/894/142 : Column densities from COS SiIV AGN sight lines (Qu+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/924/86https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/924/86http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/924/86https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/924/86https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/924/86http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/924/86GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/924/86/table1 (Column density measurements of the matched CIV and SiIV sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/924/86/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/924/86/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/924/86/table1?GETtext/xml+votable180.050000true205.698618.74180.0055555555555555566/0 907 2161 2221 2245 2287 2414 2444 2584 2610 2621 2663 2733 2754 2764 4107 4118 4204 4256 4821 4824 4961 4966 4989 5117 5215 5244 5249 5262 5274 5284 5371 5409 5414 5423 5437 5481 5501 5529 5687 5731 5759 5820-5821 5831 5861 5881-5882 5974 6021 6081 6087 6104 6438 6488 6493 6557 6582 6606 7277 7280 7309 7381 7448 7456 7508 7642 7896 7998 8071 8216 8226 8282 8299 8392 8486 8641 8742 8838 8845 8858 8867 8910 8915 8923 8934 8939 9018 9031 9186 9260 9440 9457 9753 9756 9783 9817 10162 10298 10300 10433 10468 10517 10602 10634 10691 10707 10789 10854 10969 11021 11170 11209 11217 11388 11462 11490 11668 11898 12380 12752 13414 16894 17075 17186 17203 17251 17488 17499 17673 17703 17730 17746 17990 18005 18409 18581 18601 18770 18786 18954 19283 19433 19700 19730 19767 19883 19909 19932 20079 20099 20269 20290 20315 20428 21126 22659 23060 23203 25132 25742 26017 26088 26259 26270 26297 26350 26396 26453 26859 26863 26902 26965 27006 27023 27229 27250 27349-27350 27376 27423 27526 27562 27607 27720 27834 27902 27964 28083 28143 28201 28356 28383 28395 28401 28468 28471 28517 28527 28546 28571 28589 28636 29398 30873 31649 31658 31663 32948 32986 32998 33126 33233 33930 33950 34065 34881 35001 35018 35180 35205 35360 35542 35741 35743 36234 36275 36278 36281 36313 36443 36775 36786 36788 37385 38268 38837 38916 40213 44988 45341 45500 45915 46021 46190 46281 46299 46412 46444 46555 46647 46795 47169 47375 47412 47510 48290 48614 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/924/86?format=asciiUVdefaultJ/ApJ/924/86/table1Column density measurements of the matched CIV and SiIV samplel_logN-CIVLimit flag on logN-CIVmeta.code.errorchare_logN-CIV[0.01/0.12]? Uncertainty in logN-CIVstat.errorfloatnullablevc-CIV[-161.5/78]? Weighted C IV line centroidkm/sspect.dopplerVelocfloatnullablee_vc-CIV[0.2/30.2]? Uncertainty in vc-CIVkm/sstat.errorfloatnullableSN-CIV[5/107] Signal-to-noise, CIVstat.snrintlogN-SiIV[12.84/14.06]? Si IV column densityphys.columnDensityfloatnullable_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.raindexed_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.decindexedSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitudedegpos.galactic.lonGLAT[-83.7/86.6] Galactic latitudedegpos.galactic.latlogN-CIV[13/14.9] C IV column densityphys.columnDensityfloatl_logN-SiIVLimit flag on logN-SiIVmeta.code.errorchare_logN-SiIV[0.01/0.13]? Uncertainty in logN-SiIVstat.errorfloatnullablevc-SiIV[-131.5/58.4]? Weighted Si IV line centroidkm/sspect.dopplerVelocfloatnullablee_vc-SiIV[0.3/35]? Uncertainty in vc-SiIVkm/sstat.errorfloatnullableSN-SiIV[5/92]? Signal-to-noise, SiIVstat.snrintnullableIDSight line identifiermeta.id;meta.mainchar