J/ApJ/928/129ivo://CDS.VizieR/J/ApJ/928/129doi:10.26093/cds/vizier.19280129CDSQiao H.-H.Shen Z.-Q.Breen S.L.Yang K.Chen XiLi J.2024-11-06T20:24:15Z2024-03-19T12:29:48ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyinterstellar-mediumstar-forming-regionsWe have used the Shanghai Tianma Radio Telescope to search for three OH transitions at 4.7GHz toward 155 northern star formation regions. We detect 4.7GHz OH masers in 18 star formation regions, 8 of which are reported here for the first time. From these 18 sources, we detect 6 4660MHz masers, 13 4765MHz masers, and no 4750MHz masers. A further 1 source (Sgr B2N) has been re-detected with broad quasi-thermal emission in all three OH lines. W49SW was re-detected with broad quasi-thermal emission at both 4660 and 4750MHz. One source (W31, G010.626-0.387) was re-detected with quasi-thermal emission at both 4750 and 4765MHz. One source (G005.885-0.392) was first detected with quasi-thermal emission at 4660MHz. We have investigated the associations between the detected 4.7GHz OH masers with ground-state OH masers near 1.7GHz, 6.7GHz methanol masers and 22GHz water masers reported in the literature. We find that the presence of 1665MHz OH masers is a better indicator of the presence of 4.7GHz OH masers than 1720MHz OH masers. The majority of the 4.7GHz OH masers are associated with 6.7GHz methanol and/or 22GHz water masers. We have compared the characteristics of our detections with those reported previously in the literature and found that only five sources are fairly stable.2022ApJ...928..129Qhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/928/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)J/A+AS/101/153 : Galactic H2O masers (Palagi+ 1993)J/A+AS/120/283 : Water maser features in ultracompact HII reg. (Hofner+ 1996)J/A+AS/137/43 : OH/H2O masers database (Forster+, 1999)J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000)J/A+A/414/235 : OH maser emission from star forming reg. (Szymczak+, 2004)J/A+A/432/737 : General Cat. of 6.7GHz Methanol Masers (Pestalozzi+, 2005)J/A+A/465/865 : OH masers towards protostellar objects (Edris+, 2007)J/MNRAS/442/2240 : Accurate water maser positions from HOPS (Walsh+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/928/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/928/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/928/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/928/129https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/928/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/928/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/928/129/table1 (Sources searched for 4.7GHz OH masers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/928/129/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/928/129/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/928/129/table1?GETtext/xml+votable180.050000true266.589167-28.5941670.0055555555555555565/7383 6/1340 3630 3649 14317 14353 14355 14594 14622 14624 14630 14655 14671 14697 14704 15452 15473 15671 15676 15681 21439 21458 21510 23764 23982 24325 24507 24554 28825 28827-28830 28874 28891 28900-28901 28912-28913 28919 29091 29096-29097 29100-29101 29103 29112 29116 29461 29504 29510-29511 29529 30218-30219 30241 30244-30245 30256 30258-30259 30262-30263 30268-30269 30312-30313 30315 30318-30319 30328 30330 30405 30416-30417 30420 30423 30595 30616-30618 30622 30644 30691 30694 30714 39895https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/928/129?format=asciiRadiodefaultJ/ApJ/928/129/table1Sources searched for 4.7GHz OH masersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget name (GLLL.lll+BB.bbb)meta.id;meta.maincharprimaryRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainEpochEpoch(s) of observation (1)time.epochcharf_EpochFlag on Epoch (2)meta.codecharPrevDetTransition(s) previously detectedMHzphys.atmol.transProb;phys.atmol.transitioncharONameOther namemeta.idcharRefReference (3)meta.ref;pos.framecharOHRegion showing 4.7GHz OH emission (link to Tables 2+3)meta.ref.urlintnullableJ/ApJ/928/129/table2Star formation regions showing 4.7GHz OH emissionNameTarget name (GLLL.lll+BB.bbb)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[4660/4765] Frequency of the detectionMHzem.freqintf_FreqFlag on Freq (1)meta.codecharDateDate of observation (UT)time.epochnullableDelV1[-62.4/110.7] Lower velocity range of OH emissionkm/sphys.veloc;stat.minfloatDelV2[-61.9/111.5] Upper velocity range of OH emissionkm/sphys.veloc;stat.maxfloatVpk[-62.1/111.1] Peak velocity of the maser emission (2)km/sphys.veloc;stat.maxfloatSpk[0.2/44.5] Peak flux density (3)Jyphot.flux.density;em.radio.3-6GHzfloatONameOther namemeta.idcharRefOH maser emission reference (4)meta.bibcharf_RefFlag on Ref (1)meta.codecharOtherMaser speciesmeta.notecharJ/ApJ/928/129/table3Fitted line parameters of the 4.7GHz OH emissionNameTarget name (GLLL.lll+BB.bbb)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[4660/4765] Frequency of the OH transitionMHzem.freqintf_FreqFlag on Freq (1)meta.codecharVlsr[-62.2/111.2] Peak velocity of the fitted spectral componentkm/sphys.veloc;pos.lsrfloate_Vlsr[0/0.7] Vlsr uncertaintykm/sstat.error;phys.veloc;pos.lsrfloatdelV[0.19/21.5] FWHM line widthkm/sspect.line.widthfloate_delV[0/2] delV uncertaintykm/sstat.errorfloatS[0.09/14.3] Integrated flux densityJy.km/sphot.flux.density;em.radio.3-6GHzfloate_S[0.01/0.4] S uncertaintyJy.km/sstat.errorfloatSpk[0.15/48.2] Peak flux density of the fitted spectral featureJyphot.flux.density;em.radio.3-6GHzfloatsigma[0.04/0.15]? 1{sigma} level of each spectrum before smoothingJyphot.flux.densityfloatnullable