J/MNRAS/448/2344ivo://CDS.VizieR/J/MNRAS/448/2344doi:10.26093/cds/vizier.74482344CDSJordan C.H.Walsh A.J.Lowe V.Voronkov M.A.Ellingsen S.P.,Breen S.L.Purcell C.R.Barnes P.J.Burton M.G.Cunningham M.R.,Hill T.Jackson J.M.Longmore S.N.Peretto N.Urquhart J.S.2024-08-14T20:20:11Z2018-05-15T08:20:34ZCDS support team

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

cds-question@unistra.frsurveysmilky-way-galaxyastrophysical-masersradio-astronomyWe present the first results from the MALT-45 (Millimetre Astronomer's Legacy Team-45GHz) Galactic Plane survey. We have observed 5 square degrees (l=330{deg}-335{deg}, b=+/-0.5{deg}) for spectral lines in the 7mm band (42-44 and 48-49GHz), including CS (1-0), class I CH_3_OH masers in the 7(0,7)-6(1,6) A^+^ transition and SiO (1-0) v=0,1,2,3. MALT-45 is the first unbiased, large-scale, sensitive spectral line survey in this frequency range. In this paper, we present data from the survey as well as a few intriguing results; rigorous analyses of these science cases are reserved for future publications. Across the survey region, we detected 77 class I CH_3_OH masers, of which 58 are new detections, along with many sites of thermal and maser SiO emission and thermal CS. We found that 35 class I CH_3_OH masers were associated with the published locations of class II CH_3_OH, H_2_O and OH masers but 42 have no known masers within 60 arcsec. We compared the MALT-45 CS with NH_3_ (1,1) to reveal regions of CS depletion and high opacity, as well as evolved star-forming regions with a high ratio of CS to NH_3_. All SiO masers are new detections, and appear to be associated with evolved stars from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE). Generally, within SiO regions of multiple vibrational modes, the intensity decreases as v=1, 2, 3, but there are a few exceptions where v=2 is stronger than v=1.2015MNRAS.448.2344Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/2344CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)J/A+AS/124/509 : ATCA/VLA OH 1612 MHz survey. II. (Sevenster+ 1997)J/MNRAS/359/1498 : Class I and class II methanol masers (Ellingsen+, 2005)J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/ApJS/196/9 : 95GHz methanol maser survey toward GLIMPSE EGOs (Chen+ 2011)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/MNRAS/448/2344https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/2344http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/2344https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/2344https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/2344http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/2344GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/448/2344/table2 (Properties of detected MALT-45 class I CH_3_OH maser emission (each maser was detected within a 64MHz zoom window))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2344/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2344/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2344/table2?GETtext/xml+votable180.050000true241.9075-52.5144720.005555555555555556Cone search capability for table J/MNRAS/448/2344/table3 (*Properties of detected MALT-45 SiO (1-0) maser emission (each maser was detected within a 64MHz zoom window))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2344/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2344/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2344/table3?GETtext/xml+votable180.050000true241.60125-52.5759720.0055555555555555565/10542 6/42158-42159 42172-42174 42210 42216 42500-425012.8377799047813437e-23 2.8377799047813437e-23https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/448/2344?format=asciiRadiodefaultJ/MNRAS/448/2344/table2Properties of detected MALT-45 class I CH_3_OH maser emission (each maser was detected within a 64MHz zoom window)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (GLLL.ll+B.bb), derived from Galactic coordinates of the brightest peakmeta.id;meta.maincharRAJ2000Maser right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Maser declination (J2000)pos.eq.dec;meta.mainSpeakSource peak flux density in 7mm bandJyphot.flux.density;em.mm.30-50GHzfloatRMSRMS noise level of the peakinstr.det.noise;stat.maxfloatVminVelocity range of maser emission, within a 1.5{sigma} cutoffkm/sspect.dopplerVelocfloatVmaxVelocity range of maser emission, within a 1.5{sigma} cutoffkm/sspect.dopplerVelocfloatVpeakVelocity at the peakkm/sphys.velocfloatDistKinematic distance calculated, based on position and peak velocity (1)kpcpos.distancefloatE_DistUpper error for the kinematic distancekpcstat.error;stat.maxfloate_DistLower error for the kinematic distancekpcstat.errorfloatICS? Integrated intensity of CS (1-0) at the brightest peakK.km/sphot.flux.density;em.radiofloatnullableISiO? Integrated intensity of SiO (1-0) v=0 at the brightest peakK.km/sphot.flux.density;em.radiofloatnullableRemAdditional remarks (2)meta.notecharOmasersAssociations with other masers and EGOs (3)meta.codecharJ/MNRAS/448/2344/table3*Properties of detected MALT-45 SiO (1-0) maser emission (each maser was detected within a 64MHz zoom window)OmasersAdditional remarks (4)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (GLLL.ll+B.bb), derived from Galactic coordinates of the brightest peakmeta.id;meta.maincharRAJ2000Maser right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Maser declination (J2000)pos.eq.dec;meta.mainSpeak1? Source peak flux density, SiO v=1 (1)Jyphot.flux.density;em.mm.30-50GHzfloatnullableVmini1? Velocity range of maser emission, SiO v=1, within a 1.5{sigma} cutoff (2)km/sspect.dopplerVelocfloatnullableVmax1? Velocity range of maser emission, SiO v=1, within a 1.5{sigma} cutoff (2)km/sspect.dopplerVelocfloatnullableVpeak1? Velocity at the peak, SiO v=1 (2)km/sphys.velocfloatnullableSpeak2? Source peak flux density, SiO v=2 (1)Jyphot.flux.density;em.mm.30-50GHzfloatnullableVmini2? Velocity range of maser emission, SiO v=2, within a 1.5{sigma} cutoff (2)km/sspect.dopplerVelocfloatnullableVmax2? Velocity range of maser emission, SiO v=2, within a 1.5{sigma} cutoff (2)km/sspect.dopplerVelocfloatnullableVpeak2? Velocity at the peak, SiO v=2 (2)km/sphys.velocfloatnullableSpeak3? Source peak flux density, SiO v=3 (1)Jyphot.flux.density;em.mm.30-50GHzfloatnullableVmini3? Velocity range of maser emission, SiO v=3, within a 1.5{sigma} cutoff (2)km/sspect.dopplerVelocfloatnullableVmax3? Velocity range of maser emission, SiO v=3, within a 1.5{sigma} cutoff (2)km/sspect.dopplerVelocfloatnullableVpeak3? Velocity at the peak, SiO v=3 (2)km/sphys.velocfloatnullableRMSRMS noise level, which indicates the most statistically significant maser peak detected among the three modesinstr.det.noise;stat.maxfloatDistKinematic distance calculated, based on position and peak velocity (3)kpcpos.distancefloatE_DistUpper error for the kinematic distancekpcstat.error;stat.maxfloate_DistLower error for the kinematic distancekpcstat.errorfloat