J/ApJS/209/25ivo://CDS.VizieR/J/ApJS/209/25doi:10.26093/cds/vizier.22090025CDSKang M.Lee J.-E.Choi M.Choi Y.Kim K.-T.Di Francesco J.,Park Y.-S.2017-07-04T07:09:31Z2015-05-15T13:09:38ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyinfrared-sourcessurveysThe results of a maser survey toward 99 protostars in the Orion molecular cloud complex are presented. The target sources are low-mass protostars identified from infrared observations. Single-dish observations were carried out in the water maser line at 22GHz and the methanol class I maser lines at 44, 95, and 133GHz. Most of the detected sources were mapped to determine the source positions. Five water maser sources were detected, and they are excited by HH 1-2 VLA 3, HH 1-2 VLA 1, L1641N MM1/3, NGC 2071 IRS 1/3, and an object in the OMC 3 region. The water masers showed significant variability in intensity and velocity with time scales of 1 month or shorter. Four methanol emission sources were detected, and those in the OMC 2 FIR 3/4 and L1641N MM1/3 regions are probably masers. The methanol emission from the other two sources in the NGC 2071 IRS 1-3 and V380 Ori NE regions are probably thermal. For the water masers, the number of detections per protostar in the survey region is about 2%, which suggests that the water masers of low-mass protostars are rarely detectable. The methanol class I maser of low-mass protostars is an even rarer phenomenon, with a detection rate much smaller than 1%.2013ApJS..209...25Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/209/25CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/209/25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/209/25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/209/25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/209/25https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/209/25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/209/25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/209/25/targets (Target sources, with detections , affected by the Orion KL water masers, or without detection)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/209/25/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/209/25/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/209/25/targets?GETtext/xml+votable180.050000true83.8625-5.16502780.005555555555555556Cone search capability for table J/ApJS/209/25/table6 (Line emission source positions determined by mapping)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/209/25/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/209/25/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/209/25/table6?GETtext/xml+votable180.050000true83.865417-5.1627780.0055555555555555566/21425 21427 21428 21430 21436 21438 21439 22804 22805 22854 22855 22861 22873 22876 23560https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/209/25?format=asciiInfraredRadiodefaultJ/ApJS/209/25/table7*CH_3_OH line parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKLC? KLC number (#3 in table5 was originally marked as a footnote 'b')meta.idintnullableHOPS[64/362] HOPS numbermeta.id;meta.mainintFreq? CH_3_OH line frequency (G1)GHzem.freqintnullablef_Freq[b] b: two-component Gaussian fitmeta.codecharVp[-14.4/25.7] Peak velocitykm/sspect.dopplerVelocfloate_Vp[0.01/0.3] Vp uncertainty (2)km/sstat.errorfloatFdV[0.6/311] Integrated line fluxJy.km/sphot.flux.density;spect.linefloate_FdV[0.2/3.5] FdV uncertaintyJy.km/sstat.errorfloatDelV[0.2/6.3] Line FWHM {delta}Vkm/sspect.line.width;em.opt.V;spect.linefloate_DelV[0.01/0.6] DelV uncertainty (2)km/sstat.errorfloatFp[1.8/395] Peak intensity from Gaussian fitsJyspect.line.intensityfloatJ/ApJS/209/25/targetsTarget sources, with detections , affected by the Orion KL water masers, or without detectionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnLNumber of line parametersmeta.numberintnullableHOPS[1/362] HOPS numbermeta.id;meta.mainintprimaryf_HOPSSimbad column added by the CDSmeta.codecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainH2O[NSY, ] H_2_O detection? (1)meta.codecharCH3OHCH_3_OH detection? (1)meta.codecharSig22[0.3/0.7] Noise rms levels of the resulting H_2_0 spectra at 22GHzJystat.stdev;phot.flux.density;em.radio.12-30GHzfloatSig44[0.4/0.7] Noise rms levels of the resulting CH_3_OH spectra at 44GHzJystat.stdev;phot.flux.density;em.mm.30-50GHzfloatM12Sources within 2" from Megeath et al. 2012, J/AJ/144/192meta.ref.urlintnullableS13Display the data from Stutz et al. 2013, J/ApJ/767/36, if anymeta.numberintnullableJ/ApJS/209/25/table5*H_2_O maser line parametersHOPS[64/362] HOPS numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKLC? KLC number (#3 in table5 was originally marked as a footnote 'b')meta.idintnullableVp[-14.4/25.7] Peak velocitykm/sspect.dopplerVelocfloate_Vp[0.01/0.3] Vp uncertainty (2)km/sstat.errorfloatFdV[0.6/311] Integrated line fluxJy.km/sphot.flux.density;spect.linefloate_FdV[0.2/3.5] FdV uncertaintyJy.km/sstat.errorfloatDelV[0.2/6.3] Line FWHM {delta}Vkm/sspect.line.width;em.opt.V;spect.linefloate_DelV[0.01/0.6] DelV uncertainty (2)km/sstat.errorfloatFp[1.8/395] Peak intensity from Gaussian fitsJyspect.line.intensityfloatEpochEpoch (only for table 5)time.epochnullableJ/ApJS/209/25/table6Line emission source positions determined by mappingSimbadNameSimbad column added by the CDSmeta.idcharLineLinemeta.id;spect.lineEpochEpochtime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKLCKLC number (1)meta.idintHOPS[64/362] HOPS numbermeta.id;meta.mainintDay2[1-31]? Second day of epochtime.epochintnullableVpPeak velocity V_p_km/sspect.dopplerVeloccharn_Vp[b] b: All the velocity components listed in Table 5meta.notecharRAJ2000Hour of right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (2)pos.eq.dec;meta.mainAssocAssociated objectmeta.id.assocchar