J/ApJS/256/7ivo://CDS.VizieR/J/ApJS/256/7doi:10.26093/cds/vizier.22560007CDSBayandina O.S.Val'tts I.E.Kurtz S.E.Shakhvorostova N.N.2022-09-02T12:48:34Z2022-02-18T13:45:42ZCDS support team

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

cds-question@unistra.frstar-forming-regionsastrophysical-masersradio-astronomyradio-continuum-emissionClass I methanol masers (cIMMs) and 1720MHz OH masers are believed to arise from a common collisional pumping mechanism, and both trace shocked gas regions in supernova remnants (SNRs). However, their coexistence in star formation regions (SFRs) and their association with a front of bipolar outflow (a source of shock-stimulated collisional pumping) remain unclear. To search for collisionally pumped OH(1720) masers, we conducted a Very Large Array survey of the 18cm OH masers and continuum emission toward a sample of 80 SFRs associated with 44GHz cIMMs. Main-line OH maser emission was detected in 50% of the sample, and OH(1720) maser emission was detected in 20%. Continuum emission was detected in 28% of sources. A catalog of the detected OH masers is presented. Individual OH masers are found in close proximity, and the regions of masers of different transitions are often overlapping. A typical linear projected offset between the OH(1720) and OH(1665) masers is ~0.04pc. A remarkable number of ~81% of the OH(1720) masers are associated with the continuum emission. The median separation between the targeted 44GHz cIMMs and OH(1720) masers is ~0.2pc, which is similar to reported distances between cIMMs and HII regions. The observed properties of the detected OH(1720) masers are different from those in SNRs and indicate that a nonlocal line overlap mechanism is responsible for their excitation. Thus, while both 44GHz cIMMs and OH(1720) masers trace shocked gas in SNRs, physical conditions favorable for excitation of cIMMs, but not OH(1720) masers, are present in SFRs.2021ApJS..256....7Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/256/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/98/589 : IRAS Sources behind the Solar circle (Wouterloot+ 1993)J/A+A/336/339 : VLA observations of ultracompact HII regions (Molinari+ 1998)J/A+AS/137/43 : OH/H2O masers database (Forster+, 1999)J/A+A/414/235 : OH maser emission from star forming regions (Szymczak+, 2004)J/A+A/426/503 : High velocity molecular outflows (Update) (Wu+ 2004)J/ApJS/155/149 : CH_3_OH 7_0_-6_1_ A^+^ maser sources (Kurtz+, 2004)J/ApJS/160/220 : Full-polarization observations of OH masers (Fish+, 2005)J/A+A/430/941 : Star formation region NGC 6530 (Prisinzano+, 2005)J/A+A/465/865 : OH masers towards high mass protostellar object (Edris+, 2007)J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/ApJ/702/1615 : CH_3_OH maser survey of EGOs (Cyganowski+, 2009)J/ApJ/720/1055 : VBLA observations of W51 Main/South (Sato+, 2010)J/AZh/89/611 : Class I methanol maser catalog (Bayandina+, 2012)J/A+A/628/A90 : OH maser emission in THOR survey (Beuther+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/256/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/256/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/256/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/256/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/256/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/256/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/256/7/table1 (Observed source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/256/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/256/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/256/7/table1?GETtext/xml+votable180.050000true267.560833-28.9141670.005555555555555556Cone search capability for table J/ApJS/256/7/table2 (OH maser parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/256/7/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/256/7/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/256/7/table2?GETtext/xml+votable180.050000true267.56070833-28.908377780.005555555555555556Cone search capability for table J/ApJS/256/7/table3 (Parameters of 20cm continuum emission associated with OH masers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/256/7/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/256/7/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/256/7/table3?GETtext/xml+votable180.050000true267.55914583-28.907505560.005555555555555556Cone search capability for table J/ApJS/256/7/table4 (Separation between a 20cm continuum source and other objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/256/7/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/256/7/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/256/7/table4?GETtext/xml+votable180.050000true267.55969583-28.906227780.0055555555555555566/862 1307 2973 2996 3061 3649 13050 13230 14287 14299 14307 14314-14315 14317 14353 14355 14594 14630 14647 14655 14689 14696 14704 15430 15479 15667 15759 15794 21439 22051 22805 22873 22876 23637 23773 23969 24325 24365 24507 24554 28808 28829-28830 28891 28912 28919 29510 29513 29533 30218-30219 30222 30241 30244-30245 30256 30259 30262 30269 30313 30319 30405 30416-30417 30425 30604 30616 30618 30622 30624 30694 30716 42455https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/256/7?format=asciiRadiodefaultJ/ApJS/256/7/table1Observed source listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNohNumber of OH maser parameters (link to Table 2)meta.numberintnullableNameSource namemeta.id;meta.maincharprimaryONameAlias(es)meta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVlsr[-58/115] Median velocity, local standard of restkm/sphys.veloc;pos.lsrfloatd1612[+-] Detection at 1612 MHz?meta.codechard1665[+-] Detection at 1665 MHz?meta.codechard1667[+-] Detection at 1667 MHz?meta.codechard1720[+-] Detection at 1720 MHz?meta.codecharamajOH[11.2/46] OH synthetic beam, major axisarcsecphys.angSizefloatbminOH[10.2/17.6] OH synthetic beam, minor axisarcsecphys.angSize;srcfloatPAOH[-90/88] OH beam, position angledegpos.posAng;instr.beamfloatd1.5GHz[+-] Detection at 1.5 GHz?meta.codecharamajCont[10.4/48.1] Continuum synthetic beam, major axisarcsecphys.angSizefloatbminCont[8/16.8] Continuum synthetic beam, minor axisarcsecphys.angSize;srcfloatPACont[-179/91] Continuum beam, position angledegpos.posAng;instr.beamfloatc20cmDisplay the 20cm continuum emission data (link to Table 3)meta.ref.urlintnullableSepDisplay the 20cm continuum separations (link to Table 4)meta.ref.urlintnullableJ/ApJS/256/7/table2OH maser parametersNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[1612/1720] FrequencyMHzem.freqintPol[LR] Polarisationmeta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAJ2000Uncertainty in RAssstat.error;pos.eq.rafloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEJ2000Uncertainty in DEsarcsecstat.error;pos.eq.decfloatInt[0.09/389] Integrated FluxJyphot.flux.density;em.radio.1500-3000MHzfloate_Int[0.01/7] Uncertainty in IntJystat.errorfloatFlux[0.1/387] Peak FluxJy/beamphot.flux.density;em.radio.1500-3000MHzfloate_Flux[0.01/4] Uncertainty in FluxJy/beamstat.error;phot.fluxfloatVel[-60.3/114.3] Velocitykm/sphys.velocfloatJ/ApJS/256/7/table3Parameters of 20cm continuum emission associated with OH masersNameSource namemeta.id;meta.maincharbmin[10.6/65]? Size, semi-minor axisarcsecphys.angSize.sminAxisfloatnullablee_bmin[0.4/7]? Uncertainty in bminarcsecstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAJ2000? Uncertainty in RAssstat.error;pos.eq.rafloatnullableDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEJ2000? Uncertainty in DEsarcsecstat.error;pos.eq.decfloatnullableamaj[15.6/85]? Size, semi-major axisarcsecphys.angSize;srcfloatnullablee_amaj[0.4/11.1]? Uncertainty in amajarcsecstat.errorfloatnullablePA[55/167]? Position angledegpos.posAngintnullablee_PA[2/45]? Uncertainty in PAdegstat.errorintnullableInt[0.01/5.1] Integrated FluxJyphot.flux.density;em.radio.1500-3000MHzfloate_Int[0.001/0.09]? Uncertainty in IntJystat.errorfloatnullableFlux[0.01/1.3] Peak Flux in units of Jy/beamJy/beamphot.flux.density;em.radio.1500-3000MHzfloate_Flux[0.001/0.01]? Uncertainty in FluxJy/beamstat.error;phot.fluxfloatnullableJ/ApJS/256/7/table4Separation between a 20cm continuum source and other objectsNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA20? Hour of Right Ascension, 20cm cont. (J2000) (1)pos.eq.decnullableDE20? Degree of Declination, 20cm cont. (J2000) (1)pos.eq.decnullableRA12? Hour of Right Ascension, OH(1612) (J2000) (1)pos.eq.decnullableDE12? Degree of Declination, OH(1612) (J2000) (1)pos.eq.decnullableRA65? Hour of Right Ascension, OH(1665) (J2000) (1)pos.eq.decnullableDE65? Degree of Declination, OH(1665) (J2000) (1)pos.eq.decnullableRA67? Hour of Right Ascension, OH(1667) (J2000) (1)pos.eq.decnullableDE67? Degree of Declination, OH(1667) (J2000) (1)pos.eq.decnullableRAJ2000Hour of Right Ascension, OH(1720) (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination, OH(1720) (J2000) (1)pos.eq.dec;meta.mainRAcIMMHour of Right Ascension, cIMM (J2000) (2)pos.eq.decDEcIMMDegree of Declination, cIMM (J2000) (2)pos.eq.decRef-cIMMReference for Position 6, cIMM (2)meta.bibcharSep12? Separation, OH1612, arcsecondsarcsecpos.angDistancefloatnullableSep12pc? Separation, OH1612, parsecspcpos.angDistancefloatnullableSep65? Separation, OH1665, arcsecondsarcsecpos.angDistancefloatnullableSep65pc? Separation, OH1665, parsecspcpos.angDistancefloatnullableSep67? Separation, OH1667, arcsecondsarcsecpos.angDistancefloatnullableSep67pc? Separation, OH1667, parsecspcpos.angDistancefloatnullableSep? Separation, OH1720, arcsecondsarcsecpos.angDistancefloatnullableSeppc? Separation, OH1720, parsecspcpos.angDistancefloatnullableSepcIMM? Separation, cIMM, arcsecondsarcsecpos.angDistancefloatnullableSepcIMMpc? Separation, cIMM, parsecspcpos.angDistancefloatnullableDistDistancekpcpos.distance;pos.heliocentricfloatr_DistReference for Dist (3)meta.ref;pos.frameint