J/A+A/656/A146ivo://CDS.VizieR/J/A+A/656/A146doi:10.26093/cds/vizier.36560146CDSMirocha A.Karska A.Gronowski M.Kristensen L.E.Tychoniec L.,Harsono D.Figueira M.Gladkowski M.Zoltowski M.2022-03-21T09:00:12Z2021-12-16T09:38:04ZCDS support team

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

cds-question@unistra.frinterstellar-mediummolecular-physicsspectroscopyUltraviolet radiation (UV) influences the physics and chemistry of star-forming regions, but its properties and significance in the immediate surroundings of low-mass protostars are still poorly understood. We aim to extend the use of the CN/HCN ratio, already established for high-mass protostars, to the low-mass regime to trace and characterize the UV field around low-mass protostars on ~0.6x0.6pc scales. The spatial distribution of HCN and CS are well-correlated with CO 6-5 emission that traces outflows. The CN emission is extended from the central protostars to their immediate surroundings also tracing outflows, likely as a product of HCN photodissociation. The ratio of CN to HCN total column densities ranges from ~1 to 12 corresponding to G_0_~10^1^-10^3^ for gas densities and temperatures typical for outflows of low-mass protostars. UV radiation associated with protostars and their outflows is indirectly identified in a significant part of the Serpens Main low-mass star-forming region. Its strength is consistent with the values obtained from the OH and H_2_O ratios observed with Herschel and compared with models of UV-illuminated shocks. From a chemical viewpoint, the CN to HCN ratio is an excellent tracer of UV fields around low- and intermediate-mass star-forming regions.2021A&A...656A.146Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/656/A146CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/656/A146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/656/A146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/656/A146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/656/A146https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/656/A146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/656/A146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/656/A146/listList of fits filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintbFreqLower value of frequency intervalHzem.freq;stat.mindoubleBFreqLower value of frequency intervalHzem.freq;stat.mindoubledFreqFrequency resolutionHzspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits