J/ApJ/952/50ivo://CDS.VizieR/J/ApJ/952/50doi:10.26093/cds/vizier.19520050CDSThompson W.E.Giese M.M.Lis D.C.Widicus Weaver S.L.2025-10-01T20:10:24Z2025-09-26T13:28:17ZCDS support team

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

cds-question@unistra.frinterferometryh-ii-regionsradio-spectroscopystar-forming-regionsmolecular-physicsPresented here are NOEMA interferometric observations of the neighboring hot cores W3(H_2_O) and W3(OH). The presence of two star-forming cores at different evolutionary stages within the same parent cloud presents a unique opportunity to study how the physics of the source and its evolutionary stage impact the chemistry. Through spectral analysis and imaging, we identify over 20 molecules in these cores. Most notably, we have detected HDO and CH_3_CH_2_CN in W3(OH), which were previously not detected in this core. We have imaged the molecular emission, revealing new structural features within these sources. W3(OH) shows absorption in a "dusty cocoon" surrounded by molecular emission. These observations also reveal extended emission that is potentially indicative of a low-velocity shock. From the information obtained herein, we have constructed column density and temperature maps for methanol and compared this information to the molecular images. By comparing the spatial distribution of molecules that may be destroyed at later stages of star formation, this work demonstrates the impact of physical environment on chemistry in star-forming regions at different evolutionary stages.2023ApJ...952...50Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/952/50CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/iram/noema : IRAM Observation Logs (IRAM 1991-)J/A+AS/124/205 : W3 star-forming region 345 GHz survey (Helmich+ 1997)J/A+AS/132/211 : Interstellar SiO sources (Harju+ 1998)J/A+A/358/257 : Molecular clouds SO and CS obs. II. (Nilsson+, 2000)J/AZh/79/610 : Methyl acetylene observations of warm clouds (Alakoz+, 2002)J/ApJ/647/418 : Ground-state OH masers in W3(OH) study (Fish+, 2006)J/other/ChA+A/36.238 : Dense parts of outflows toward cores (Sun+, 2012)J/A+A/563/A97 : IRAM 30m reduced spectra of 59 sources (Gerner+, 2014)J/A+A/567/L5 : W3(OH) high angular resolution 7mm images (Dzib+, 2014)J/ApJS/213/1 : The MSFRs Omnibus X-ray Catalog (MOXC) (Townsley+, 2014)J/ApJS/232/3 : Spectral line surveys of 30 regions (Widicus Weaver+, 2017)J/A+A/612/A37 : CH 149um spectra of 4 molecular clouds (Wiesemeyer+, 2018)J/A+A/618/A46 : W3(H2O/OH) cont. & line data cubes at 1.3mm (Ahmadi+, 2018)J/ApJ/897/L38 : Protostars excitation temperatures (Van't Hoff+, 2020)J/A+A/682/A81 : CORE Sample NIKA2 and SMA images (Beuther+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/952/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/952/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/952/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/952/50https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/952/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/952/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapMillimeterdefaultJ/ApJ/952/50/fig2Spectra of W3(H2O) and W3(OH)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSpectrum identifier ("W3-H2O" or "W3-OH")meta.id;meta.maincharFreq[127398/150965] Observational spectrum frequencyMHzem.freqdoubleTemp[-31.1/50.3] Brightness temperature line intensityKspect.line.intensity;phys.temperaturedoubleJ/ApJ/952/50/fig3*GOBASIC fit many molecules to the spectra of W3(H2O) and W3(OH)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSpectrum identifier ("W3-H2O" or "W3-OH")meta.id;meta.maincharFreq[127348/151015] FrequencyMHzem.freqdoubleObsInt[-31.1/50.3] Intensity from the observational spectrumKspect.line.intensity;phys.temperaturedoublePrevFit[0/23] Previous fits from molecules not included in the tableKspect.line.intensitydoubleC2H5CN[0/4.7]? The CH_3_CH_2_CN molecule intensity, W3(H2O) onlyKspect.line.intensitydoublenullableCH3OH[0/41.3] The CH_3_OH molecule intensityKspect.line.intensitydoubleCH3OCH3[0/8.2] The CH_3_OCH_3_ molecule intensityKspect.line.intensitydoubleHCOOCH3[0/8.5] The HCOOCH_3_ molecule intensityKspect.line.intensitydoubleSO2[0/14] The SO_2_ molecule intensityKspect.line.intensitydoubleCH3CN[0/19.4] The CH_3_CN molecule intensityKspect.line.intensitydoubleTotalFit[0/41.3] Total intensity calculated fit from all moleculesKspect.line.intensitydouble