J/ApJS/258/19ivo://CDS.VizieR/J/ApJS/258/19doi:10.26093/cds/vizier.22580019CDSSong S.-M.Chen XiShen Z.-Q.Li B.Yang K.Ouyang X.Sobolev A.M.,Zhao Z.Li X.-Q.Cai F.2024-05-13T15:33:04Z2022-06-10T15:07:39ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyWe report a new survey of the 12.2GHz Class II methanol masers toward a sample of 367 sources with the 6.7GHz methanol masers conducted with the Shanghai 65m Tianma Radio Telescope. This sample has been previously made with observations of the radio continuum emission of UC HII regions by the VLA. A total of 176 sources were detected with the 12.2GHz methanol maser, with a detection rate of 48%, including 8 new detections. A lower detection rate (<10%) was determined toward the sources in the Galactic longitude ranges of 60{deg}-180{deg}, revealing that the physical environments from those sources in the Local arm or the tails of Galactic arms do not easily excite the 12.2GHz masers. In addition, two detections of highly excited-state OH masers at the 13.4GHz transition were made, one of which is a new detection. Compared to previous surveys, one-third of the detected 12.2GHz masers show considerable flux variations, implying the possible changes of their physical environments associated with variable radiation fields from their host high-mass young stellar objects. A positive log-log correlation is found between the luminosities of the 6.7 and 12.2GHz masers in our observed sample, suggesting that both the transition masers have similar excitation conditions. The statistical analysis for the relationships between the methanol maser luminosity and UC HII region spatial size indicates that the maser luminosities of both the 6.7 and 12.2GHz transitions have a decreasing trend with the spatial sizes of the associated UC HII regions, indicating that the Class II methanol masers might fade away with the HII region evolution.2022ApJS..258...19Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/258/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)J/MNRAS/291/261 : Methanol maser of IRAS-selected sources (Walsh+ 1997)J/MNRAS/301/640 : Ultracompact H II regions studies. II. (Walsh+, 1998)J/A+A/413/233 : 12.2GHz methanol survey (Blaszkiewicz+, 2004)J/ApJ/656/255 : Arecibo methanol maser Gal. plane survey (Pandian+, 2007)J/other/PASA/26.454 : Precise positions of methanol masers (Caswell, 2009)J/ApJ/717/L133 : Formaldehyde maser flares in IRAS1856+0408 (Araya+, 2010)J/AN/333/634 : Torun methanol source catalogue (Szymczak+, 2012)J/MNRAS/431/1752 : ATLASGAL 6.7GHz methanol masers (Urquhart+, 2013)J/ApJ/783/130 : Plx of high mass star forming regions (Reid+, 2014)J/MNRAS/439/2584 : Southern methanol masers at 36 & 44GHz (Voronkov+, 2014)J/MNRAS/461/2288 : Infall motions in massive star-forming reg. (He+, 2016)J/ApJ/833/18 : Ultra-compact HII regions & methanol masers (Hu+, 2016)J/ApJS/227/18 : Stellar bowshock nebulae from MIR (Kobulnicky+, 2016)J/ApJ/846/160 : 6.7GHz Class II methanol maser survey (Yang+, 2017)J/ApJ/885/131 : ~200 high-mass SFR plx & PMs with VLBI (Reid+, 2019)J/ApJ/877/154 : H_2_CO TMRT obs. of Gal. molecular clouds (Yan+, 2019)J/ApJS/241/18 : A 6.7GHz methanol maser survey. II. (Yang+, 2019)J/ApJ/899/145 : Sulfur isotopes in SFR with ARO & 30m IRAM (Yu+, 2020)J/ApJS/249/6 : Galactic interstellar ratio ^18^O/^17^O. (Zhang+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/258/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/258/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/258/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/258/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/258/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/258/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/258/19/table1 (sources with information of the 6.7GHz methanol maser line parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/258/19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/258/19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/258/19/table1?GETtext/xml+votable180.050000true267.1078333-29.20172220.005555555555555556Cone search capability for table J/ApJS/258/19/table6 (Line parameters of the 13.4GHz OH masers detected in our survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/258/19/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/258/19/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/258/19/table6?GETtext/xml+votable180.050000true270.20593-22.961670.0055555555555555565/7206-7207 7377 7383 6/3011 3061 3303 3649 12974 14063 14304 14309 14317 14353-14356 14594 14604 14622 14626 14655 14671 14689 14692 14704 15368 15390 15452 15671 15681 22518 23582 23764 23969 23982 24325 24365 24507 24554 28874-28875 28896-28897 28900-28901 28912-28913 28915 28918-28919 29090-29092 29094 29096-29097 29100-29101 29103 29112 29114-29116 29118-29119 29154 29160 29461 29504-29505 29507 29513 29522 29529 30218-30219 30222 30241 30244-30245 30256 30258-30259 30262-30263 30268-30269 30312-30313 30315 30317-30319 30328 30330 30405 30416-30417 30420 30422-30423 30425 30595 30600-30601 30604-30605 30616-30618 30622 30644 30692 30694 30701 30710 30712 30715-30716 30718-307194.439466485724119e-24 8.083804749393525e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/258/19?format=asciiRadiodefaultJ/ApJS/258/19/table1sources with information of the 6.7GHz methanol maser line parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name, GLLL.lll+BB.bbbmeta.id;meta.maincharprimarySimbadNameSimbad column added by the CDSmeta.idcharnullableRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainVpk[-70/153] Velocity at the spectral peak (2)km/sphys.velocfloatVr[0.17/21] Velocity range (2)km/sinstr.bandwidthfloatSpk6.7[0.23/3629] Peak flux density (2)Jyphot.flux.density;em.radio.6-12GHzfloatSpk6.7b[0.6/5196]? Peak flux density (3)Jyphot.flux.density;em.radio.6-12GHzfloatnullableDist[0.77/15.77] Distance (4)kpcpos.distance;pos.heliocentricfloatm12[YN] Detected 12.2GHz methanol maser in surveymeta.codecharUCHII[YN] UC HII detected by Hu+ (2016, J/ApJ/833/18)meta.codecharY19Display data from Yang+, 2019, J/ApJS/241/18 within 3"meta.ref.urlintnullableVarSource with considerable variations of the 12.2GHz methanol masers compared to previous surveys (link to Table 5)meta.ref.urlintnullableRefSource with previous reference data (link to Table4)meta.ref.urlintnullableDetDetection in 12.2GHz (link to Tables 2 and 3)meta.ref.urlintnullableJ/ApJS/258/19/detectionsLine parameters of the 8 newly-detected (Table 2) and already detected in previous observations (Table 3) 12.2GHz methanol masersNameSource name, GLLL.lll+BB.bbbmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetN=new detection or K=already detectedmeta.codecharEpochObservation datetime.epochnullableSpk[0.4/1377] Peak flux densityJyphot.flux.density;em.radio.12-30GHzfloatVpk[-59/157] Velocity at the peakkm/sspect.dopplerVelocfloatVr-min[-63/156] Velocity range, lowerkm/sphys.veloc;stat.minfloatVr-max[-56/159] Velocity range, upperkm/sphys.veloc;stat.maxfloatI[0.16/2036] Integrated flux densityJy.km/sphot.flux.density;em.radio.12-30GHzfloatJ/ApJS/258/19/table4Comparison between the 12.2GHz maser profiles of our survey and previous surveysNameSource name, GLLL.lll+BB.bbbmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSurvey12.2GHz survey reference(s) (G1)meta.bibcharCompComparisons of 12.2GHz masers between different surveysmeta.notecharJ/ApJS/258/19/table5Sources with considerable variations of the 12.2GHz methanol masers compared to previous surveysNameSource name, GLLL.lll+BB.bbbmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpk12.2[0.84/748.25] Peak flux density of the 12.2GHz, this surveyJyphot.flux.density;em.radio.12-30GHzfloatSpk12.2b[0.4/401] Peak flux density of the 12.2GHz, literature (1)Jyphot.flux.density;em.radio.12-30GHzfloatSpk6.7[2.7/5196] Peak flux density of the 6.7GHz methanol maser detected by Yang+ (2019, J/ApJS/241/18)Jyphot.flux.density;em.radio.6-12GHzfloatr_Date1Reference for first observation date (G1)meta.ref;pos.framecharDate1First observation datetime.epoch;obsnullabler_Date2Reference for second observation date (G1)meta.ref;pos.framecharDate2Second observation date if anytime.epoch;obsnullabler_Date3Reference for third observation date (G1)meta.ref;pos.framecharDate3Third observation date if anytime.epoch;obsnullableJ/ApJS/258/19/table6Line parameters of the 13.4GHz OH masers detected in our surveyNameSource name, GLLL.lll+BB.bbbmeta.id;meta.maincharSpk[1/2.16] Peak flux densityJyphot.flux.density;em.radio.12-30GHzfloatVpk[-2.6/14.2] Velocity at the peakkm/sspect.dopplerVelocfloatVr-min[-3.8/13.8] Velocity range, lowerkm/sphys.veloc;stat.minfloatVr-max[-1.8/14.5] Velocity range, upperkm/sphys.veloc;stat.maxfloatI[0.22/0.51] Integrated flux densityJy.km/sphot.flux.density;em.radio.12-30GHzfloat_GlonPositions from names (longitude part)degpos.galactic.lon_GlatPositions from names (latitude part)degpos.galactic.lat_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.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint