J/A+A/651/A9ivo://CDS.VizieR/J/A+A/651/A9doi:10.26093/cds/vizier.36510009CDSMoeller T.Schilke P.Schmiedeke A.Bergin E.A.Lis D.C.,Sanchez-Monge A.Schwoerer A.Comito C.2021-07-05T13:26:27Z2021-07-01T07:39:43ZCDS support team

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

cds-question@unistra.frinterstellar-mediummolecular-cloudssupernova-remnantsspectroscopyWe present a full analysis of a broadband spectral line survey of Sagittarius B2 (Main), one of the most chemically rich regions in the Galaxy located within the giant molecular cloud complex Sgr B2 in the Central Molecular Zone. Our goal is to derive the molecular abundances and temperatures of the high-mass star-forming region Sgr B2(M) and thus its physical and astrochemical conditions. Sgr B2(M) was observed using the Heterodyne Instrument for the Far-Infrared (HIFI) on board the Herschel Space Observatory in a spectral line survey from 480 to 1907GHz at a spectral resolution of 1.1MHz, which provides one of the largest spectral coverages ever obtained toward this high-mass star-forming region in the submillimeter with high spectral resolution and includes frequencies >1THz that are unobservable from the ground. We modeled the molecular emission from the submillimeter to the far-infrared using the XCLASS program, which assumes local thermodynamic equilibrium (LTE). For each molecule, a quantitative description was determined taking all emission and absorption features of that species across the entire spectral range into account. Because of the wide frequency coverage, our models are constrained by transitions over an unprecedented range in excitation energy. Additionally, we derived velocity resolved ortho/para ratios for those molecules for which ortho and para resolved molecular parameters are available. Finally, the temperature and velocity distributions are analyzed and the derived abundances are compared with those obtained for Sgr B2(N) from a similar HIFI survey. A total of 92 isotopologues were identified, arising from 49 different molecules, ranging from free ions to complex organic compounds and originating from a variety of environments from the cold envelope to hot and dense gas within the cores. Sulfur dioxide, methanol, and water are the dominant contributors. Vibrationally excited HCN (v2=1) and HNC (v2=1) are detected as well. For the ortho/para ratios, we find deviations from the high temperature values between 37 and 180%. In total 14% of all lines remain unidentified. Compared to Sgr B2(N), we found less complex molecules such as CH_3_OCH_3_, CH_3_NH_2_, or NH_2_CHO, but more simple molecules such as CN, CCH, SO, and SO_2_. However some sulfur bearing molecules such as H_2_CS, CS, NS, and OCS are more abundant in N than in M. The derived molecular abundances can be used for comparison to other sources and for providing further constraints for astrochemical models.2021A&A...651A...9Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/651/A9CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/559/A47 : Sgr B2(N) and Sgr B2(M) IRAM 30m line survey (Belloche+, 2013)J/A+A/604/A6 : Sgr B2 ALMA continuum and spectral index (Sanchez-Monge+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/651/A9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/651/A9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/651/A9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/651/A9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/651/A9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/651/A9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/651/A9/sgrb2m1bObserved and synthetic spectra of band 1brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m1aObserved and synthetic spectra of band 1arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m2aObserved and synthetic spectra of band 2arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m2bObserved and synthetic spectra of band 2brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m3aObserved and synthetic spectra of band 3arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m3bObserved and synthetic spectra of band 3brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m4aObserved and synthetic spectra of band 4arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m4bObserved and synthetic spectra of band 4brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m5aObserved and synthetic spectra of band 5arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m5bObserved and synthetic spectra of band 5brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m6aObserved and synthetic spectra of band 6arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m6bObserved and synthetic spectra of band 6brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m7aObserved and synthetic spectra of band 7arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddoubleJ/A+A/651/A9/sgrb2m7bObserved and synthetic spectra of band 7brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRFreqRest frequencyMHzem.freqdoubleT(MB)Observed intensity in main-beam temperature scaleKobs.paramdoubleT(MB)MModeled intensity in main-beam temperature scaleKinstr.scale;meta.modelleddouble