J/ApJS/248/18ivo://CDS.VizieR/J/ApJS/248/18doi:10.26093/cds/vizier.22480018CDSYang W.Xu YeChoi Y.K.Ellingsen S.P.Sobolev A.M.Chen XiLi J.,Lu D.2020-10-09T09:48:01Z2020-07-29T10:16:58ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyradio-sourcesinfrared-sourcesinterferometryh-ii-regionsmillimeter-astronomysubmillimeter-astronomyWe report a simultaneous 44 and 95GHz class I methanol maser survey toward 144 sources from the 95GHz class I methanol maser catalog. The observations were made with the three telescopes of the Korean very long baseline interferometry network operating in single-dish mode. The detection rates are 89% at 44GHz and 77% at 95GHz. There are 106 new discoveries at 44GHz. Comparing the previous 95GHz detections with new observations of the same transitions made using the Purple Mountain Observatory 13.7m radio telescope shows no clear evidence of variability on a timescale of six years. Emission from the 44 and 95GHz transitions shows strong correlations in peak velocity, peak flux density, and integrated flux density, indicating that they are likely cospatial. We found that the peak flux density ratio S_pk,95_/S_pk,44_ decreases as the 44GHz peak flux density increases. We found that some class I methanol masers in our sample might be associated with infrared dark clouds, while others are associated with HII regions, indicating that some sources occur at an early stage of high-mass star formation, while others are located toward more evolved sources.2020ApJS..248...18Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/248/18CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)VIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)II/328 : AllWISE Data Release (Cutri+ 2013)J/ApJS/91/659 : Ultracompact HII regions radio images (Kurtz+ 1994)J/AZh/72/22 : A 95 GHz Survey of Methanol Masers (Valtts+, 1995)J/A+A/314/615 : Maps of the 36 GHz methanol emission (Liechti+, 1996)J/A+A/308/573 : Ammonia on YSOs IRAS sources (Molinari+ 1996)J/A+A/336/339 : VLA obs. of ultracompact HII regions (Molinari+ 1998)J/MNRAS/301/640 : Ultracompact H II regions studies. II. (Walsh+, 1998)J/other/ChJAA/3.49 : Velocity & distance of methanol maser sources (Xu+, 2003)J/ApJS/155/149 : CH_3_OH 7_0_-6_1_ A^+^ maser sources (Kurtz+, 2004)J/MNRAS/359/1498 : Class I and class II methanol masers (Ellingsen+, 2005)J/A+A/432/737 : General Cat. of 6.7GHz Methanol Masers (Pestalozzi+, 2005)J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)J/AJ/133/1528 : IR nebulae around young stellar objects (Connelley+, 2007)J/ApJ/656/255 : Arecibo methanol maser Gal. plane survey (Pandian+, 2007)J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/A+A/482/585 : JHK photometry of stars in Sh 2-212 (Deharveng+, 2008)J/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)J/ApJS/188/123 : The Bolocam Galactic Plane Survey. II. (Rosolowsky+, 2010)J/ApJS/196/9 : 95GHz methanol masers toward GLIMPSE EGOs (Chen+, 2011)J/ApJS/200/5 : 95GHz class I methanol maser survey (Chen+, 2012)J/ApJS/206/9 : New EGOs from Spitzer GLIMPSE II survey. I. (Chen+, 2013)J/ApJ/763/2 : 95GHz methanol masers in molecular outflows (Gan+, 2013)J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/MNRAS/439/2584 : Southern methanol masers at 36 and 44GHz (Voronkov+, 2014)J/ApJ/810/42 : Hydrogen RRL parameters of H II regions (Anderson+, 2015)J/MNRAS/448/2344 : MALT-45, a 7mm survey of the southern Galaxy (Jordan+, 2015)J/A+A/590/A72 : Herschel counterparts of SDC (Peretto+, 2016)J/ApJS/231/20 : A new 95GHz methanol maser catalog. I. (Yang+, 2017)J/ApJS/234/33 : A GBT survey of large Galactic HII regions (Anderson+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/248/18https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/248/18http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/248/18https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/248/18https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/248/18http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/248/18GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/248/18/table1 (Target sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/248/18/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/248/18/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/248/18/table1?GETtext/xml+votable180.050000true13.099583356.56250.0055555555555555565/7278 6/3011 3649 12974 13050 14002 14287 14307 14309 14317 14352 14409 14622 14644 14665 14667 14682 14683 14691 14692 14697 14704 15362 21439 22243 22805 23969 24189 24554 28901 28912 28913 28915 28916 28918 28919 29088 29091 29094 29097 29101 29103 29116 29118 29119 29505 29511 29522 29532 29533 29535 30218 30219 30244 30245 30257 30258 30259 30262 30263 30268 30269 30312 30313 30315 30318 30319 30417 30422 30624 30694 30714 307182.9154706109355246e-23 2.1346512726771855e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/248/18?format=asciiInfraredMillimeterRadiodefaultJ/ApJS/248/18/table1Target sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIISource associated with HII region(s) (link to Table 8)meta.ref.urlintnullableNameSource identifiermeta.id;meta.maincharprimaryf_NameFlag(s) on Source (1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.main44DetDetection at 44 GHz?meta.codecharN44GHzNumber of 44GHz components for this source (link to Table 4)meta.numberintnullable95DetDetection at 95 GHz?meta.codecharN95GHzNumber of 95GHz components for this source (link to Table 5)meta.numberintnullableNewA new 44GHz detection? (2)meta.codecharsigma44[0.2/2.6] The 1{sigma} noise level in 44GHz observationJyinstr.det.noisefloatsigma95[0.4/6.3] The 1{sigma} noise level in 44GHz observationJyinstr.det.noisefloatIRDisplay the IRAS data for this source (link to Table 6)meta.ref.urlcharBCatDisplay the BGPS data from Rosolowsky+, 2010, J/ApJS/188/123 and Chen+, 2012, J/ApJS/200/5 within 1.5"meta.ref.urlintnullableY17Display data from Yang+, 2017, J/ApJS/231/20meta.ref.urlintnullableJ/ApJS/248/18/table4Parameters of Gaussian fits to 44GHz methanol maser detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identifiermeta.id;meta.maincharm_NameThe 44GHz component identifiermeta.code.multipcharVpk44[-57.7/114.4] The 44GHz peak velocitykm/sphys.veloc;em.mm.30-50GHz;stat.maxfloate_Vpk44[0/0.4] Uncertainty in Vpk44 (1)km/sstat.errorfloatDelV44[0.2/5.5] The 44GHz line widthkm/sspect.line.widthfloate_DelV44[0/1.5] Uncertainty in DelV44 (1)km/sstat.errorfloatSpk44[0.5/335] Peak 44GHz flux densityJyphot.flux.density;em.mm.30-50GHzfloate_Spk44[0.2/2.6] Uncertainty in Spk44 (1)Jystat.errorfloatS44[0.3/185] Integrated 44GHz flux densityJ.km**-1.s**-1phot.flux.density;em.mm.30-50GHzfloate_S44[0.1/6.8] Uncertainty in S44 (1)J.km**-1.s**-1stat.errorfloatintS44[0.4/221.1]? Total integrated 44GHz flux density (2)J.km**-1.s**-1phot.flux.density;em.mm.30-50GHzfloatnullableJ/ApJS/248/18/table5Parameters of Gaussian fits to 95GHz methanol maser detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identifiermeta.id;meta.maincharm_NameThe 95GHz component identifiermeta.code.multipcharVpk95[-57.8/114.2] The 95GHz peak velocitykm/sphys.velocfloate_Vpk95[0/0.9] Uncertainty in Vpk95 (1)km/sstat.errorfloatDelV95[0.2/9.4] The 95GHz line widthkm/sspect.line.widthfloate_DelV95[0/1.6] Uncertainty in DelV95 (1)km/sstat.errorfloatSpk95[0.6/165.4] Peak 95GHz flux densityJyphot.flux.density;em.mm.50-100GHzfloate_Spk95[0.4/6.3] Uncertainty in Spk95 (1)Jystat.errorfloatS95[0.4/131.4] Integrated 95GHz flux densityJ.km**-1.s**-1phot.flux.density;em.mm.50-100GHzfloate_S95[0.1/6.1] Uncertainty in S95 (1)J.km**-1.s**-1stat.errorfloatintS95[0.6/147.1]? Total integrated 95GHz flux density (2)J.km**-1.s**-1phot.flux.density;em.mm.50-100GHzfloatnullableJ/ApJS/248/18/table6The IRAS counterparts for 44-GHz class I methanol masersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identifiermeta.id;meta.maincharASep[0/59] Angular separation between Source and IRAS positionsarcsecpos.angDistanceintIRASIRAS identifier (HHMm+DDMM; B1950)meta.id.crosscharF12[0.2/78.5] IRAS 12um band flux densityJyphot.flux.density;em.IR.8-15umfloatF25[1.6/478.2] IRAS 25um band flux densityJyphot.flux.density;em.IR.15-30umfloatF60[13.5/12790] IRAS 60um band flux densityJyphot.flux.density;em.IR.30-60umdoubleF100[43.8/26780] IRAS 100um band flux densityJyphot.flux.density;em.IR.60-100umdoubleq_F12[1/3] Flux quality in F12meta.code.qualintq_F25[1/3] Flux quality in F25meta.code.qualintq_F60[1/3] Flux quality in F60meta.code.qualintq_F100[1/3] Flux quality in F100meta.code.qualintDist[0.3/11.7] Distance (1)kpcpos.distancefloatLBol[0.1/665.6] Bolometric luminosity of IRAS source (2)1000solLumphys.luminosityfloatJ/ApJS/248/18/table8Masers that may be associated with HII regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameMaser identifiermeta.id;meta.maincharASep[2/48] Angular separation of KVN targeted center and WISE HII regionsarcsecpos.angDistanceintWISEWISE HII region identifiermeta.id.assoccharRad[19/608] WISE radius of HII regionarcsecphys.angSize;srcintVel0Lower velocity range of class I methanol maserkm/sphys.veloc;stat.minintVel1Upper velocity range of class I methanol maserkm/sphys.veloc;stat.maxintVrrl[-28.2/108.1] RRL velocity of HII regionskm/sphys.velocfloatSpkr[0.4/0.9]? Peak flux density ratio between 95 and 44GHz methanol masers (S_pk,95_/S_pk,44_)phot.flux;arith.ratiofloatnullable