J/ApJ/766/114ivo://CDS.VizieR/J/ApJ/766/114doi:10.26093/cds/vizier.17660114CDSSanchez-Monge A.Kurtz S.Palau A.Estalella R.Shepherd D.Lizano S.,Franco J.Garay G.2015-07-09T16:36:01Z2015-06-15T08:49:33ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyradio-continuum-emissionh-ii-regionsmillimeter-astronomysubmillimeter-astronomyinterstellar-mediumWe present subarcsecond observations toward the massive star-forming region G75.78+0.34. We used the Very Large Array to study the centimeter continuum and H_2_O and CH_3_OH maser emission, and the Owens Valley Radio Observatory and Submillimeter Array to study the millimeter continuum and recombination lines (H40{alpha} and H30{alpha}). We found radio continuum emission at all wavelengths, coming from three components: (1) a cometary ultracompact (UC) H II region with an electron density ~3.7x10^4^/cm3, excited by a B0 type star, and with no associated dust emission; (2) an almost unresolved UCH II region (EAST), located ~6" to the east of the cometary UCH II region, with an electron density ~1.3x10^5^/cm3, and associated with a compact dust clump detected at millimeter and mid-infrared wavelengths; and (3) a compact source (CORE), located ~2" to the southwest of the cometary arc, with a flux density increasing with frequency, and embedded in a dust condensation of 30M_{sun}_. The CORE source is resolved into two compact and unresolved sources which can be well fit by two homogeneous hypercompact H II regions each one photoionized by a B0.5 zero-age main sequence star, or by free-free radiation from shock-ionized gas resulting from the interaction of a jet/outflow system with the surrounding environment. The spatial distribution and kinematics of water masers close to the CORE-N and S sources, together with excess emission at 4.5{mu}m and the detected dust emission, suggest that the CORE source is a massive protostar driving a jet/outflow.2013ApJ...766..114Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/766/114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/other/IJAA/4.571 : Methanol masers in HII regions (Farmer, 2014)J/ApJ/763/2 : 95GHz methanol masers in molecular outflows (Gan+, 2013)J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/ApJ/685/1005 : Spitzer and high-mass star forming regions (Qiu+, 2008)J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)J/ApJS/155/149 : CH_3_OH 7_0_-6_1_ A^+^ maser sources (Kurtz+, 2004)J/A+AS/133/29 : Molecular line survey towards UC HII (Hatchell+ 1998)J/A+AS/120/283 : Water maser features in HII regions (Hofner+ 1996)J/AJ/111/846 : Orion HST survey (O'Dell+ 1996)J/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/766/114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/766/114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/766/114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/766/114https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/766/114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/766/114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/766/114/table4 (22GHz water and 44GHz methanol masers in G75.78+0.34)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/766/114/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/766/114/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/766/114/table4?GETtext/xml+votable180.050000true305.433237.4438250.0055555555555555566/14622https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/766/114?format=asciiRadiodefaultJ/ApJ/766/114/table422GHz water and 44GHz methanol masers in G75.78+0.34recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMolMaser component (H_2_O or CH_3_OH)meta.id;phys.molRAJ2000[20] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[37] Degree of declination (J2000)pos.eq.dec;meta.mainSpk[0.06/122] Peak flux intensityJyphot.fluxfloatVpk[-36/14] Peak velocity (LSR)km/sspect.dopplerVelocfloatSdv[0.04/220] Integrated intensityJy.km/sphot.flux.densityfloatNotes[ ,1-4HL] Notes (1)meta.notechar