J/ApJ/833/248ivo://CDS.VizieR/J/ApJ/833/248doi:10.26093/cds/vizier.18330248CDSYu N.Xu J.2019-06-05T12:55:10Z2017-06-01T08:01:30ZCDS support team

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

cds-question@unistra.frinterstellar-mediumradio-astronomysurveysh-ii-regionsyoung-stellar-objectsmillimeter-astronomysubmillimeter-astronomychemical-abundancesRed Midcourse Space Experiment (MSX) Sources (RMSs) are regarded as excellent candidates of massive star-forming regions. In order to characterize the chemical properties of massive star formation, we made a systematic study of 87 RMSs in the southern sky, using archival data taken from the Atacama Pathfinder Experiment Telescope Large Area Survey of the Galaxy (ATLASGAL), the Australia Telescope Compact Array, and the Millimetre Astronomy Legacy Team Survey at 90GHz (MALT90). According to previous multiwavelength observations, our sample could be divided into two groups: massive young stellar objects and HII regions. Combined with the MALT90 data, we calculated the column densities of N_2_H^+^, C_2_H, HC_3_N, and HNC and found that they are not much different from previous studies made in other massive star-forming regions. However, their abundances are relatively low compared to infrared dark clouds (IRDCs). The abundances of N_2_H^+^ and HNC in our sample are at least 1mag lower than those found in IRDCs, indicating chemical depletions in the relatively hot gas. Besides, the fractional abundances of N_2_H^+^, C_2_H, and HC_3_N seem to decrease as a function of their Lyman continuum fluxes (N_L_), indicating that these molecules could be destroyed by UV photons when HII regions have formed inside. We also find that the C_2_H abundance decreases faster than HC_3_N with respect to N_L_. The abundance of HNC has a tight correlation with that of N_2_H^+^, indicating that it may be also preferentially formed in cold gas. We regard our RMSs as being in a relatively late evolutionary stage of massive star formation.2016ApJ...833..248Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/833/248CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)J/ApJ/815/130 : High-mass molecular clumps from MALT90 (Guzman+, 2015)J/MNRAS/452/4029 : RMS survey (Urquhart+, 2015)J/MNRAS/452/637 : Distance-limited sample of MYSOs (Maud+, 2015)J/MNRAS/437/1791 : RMS survey: molecular observations (Urquhart+, 2014)J/A+A/568/A41 : ATLASGAL Compact Source Catalog: 280<l<60 (Urquhart+, 2014)J/ApJ/777/157 : 90GHz obs. of high-mass star-forming regions (Hoq+, 2013)J/ApJS/208/11 : The Red MSX Source Survey: massive protostars (Lumsden+, 2013)J/ApJS/206/22 : Newly EGOs from GLIMPSE II survey. II. MoC (Chen+, 2013)J/A+A/549/A45 : ATLASGAL Compact Source Catalog: 330<l<21 (Contreras+, 2013)J/MNRAS/430/1125 : RMS survey: NIR spectroscopy of massive YSOs (Cooper+, 2013)J/ApJ/756/60 : A 3mm line survey in 37 IR dark clouds (Sanhueza+, 2012)J/MNRAS/420/1656 : RMS compact HII regions distances (Urquhart+, 2012)J/MNRAS/410/1237 : Red MSX survey (RMS) massive young stars (Urquhart+, 2011)J/ApJS/197/25 : MALT90 pilot survey (Foster+, 2011)J/A+A/527/A88 : Chemistry in infrared dark clouds (Vasyunina+, 2011)J/A+A/525/A149 : Red MSX Survey (RMS): YSO bolometric fluxes (Mottram+, 2011)J/A+A/510/A89 : RMS survey of young massive stars in far-IR (Mottram+, 2010)J/ApJ/716/1315 : Hyperfine levels of N_2_H^+^ (Keto+, 2010)J/A+A/507/795 : The RMS survey: water masers of YSOs (Urquhart+, 2009)J/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)J/A+A/487/253 : The RMS survey: ^13^CO observations of YSOs (Urquhart+ 2008)J/A+A/482/179 : Interferometric study of SgrB2(N) (Belloche+, 2008)J/A+A/476/1019 : RMS survey of southern candidate massive YSOs (Mottram+, 2007)J/A+A/461/11 : Radio observations of MYSO candidates (Urquhart+, 2007)J/AJ/126/1423 : MSX 8.3um fluxes of star-forming regions (Kraemer+, 2003)http://atlasgal.mpifr-bonn.mpg.de/cgi-bin/ATLASGAL_DATABASE.cgi : ATLASGALhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/833/248https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/833/248http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/833/248https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/833/248https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/833/248http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/833/248GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/833/248/sources (Integrated intensities, peak intensities, column densities and abundances of N_2_H^+^, C_2_H, HC_3_N, HN^13^C (tables 1, 2, 3, 4 and 5) for the 87 Red Midcourse Space Experiment (MSX) Sources (RMSs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/833/248/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/833/248/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/833/248/sources?GETtext/xml+votable180.050000true187.5171-62.94560.0055555555555555566/41597 41655 41658 41675 41677 41683 41688 41758 41763 41767 41770 41777 41781 41805 41806 41809 41811 41814 41817 41820 41824 42158 42159 42169 42170 42171 42172 42207 42210 42213 42214 42215 42224 42226 42227 42228 42229 42230 42379 42381 42383 42390 42392 42393 42396 42397 42398 42438 42441 42444 42497 42498 42499 42500 43013 43015 43024 43026https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/833/248?format=asciiRadioMillimeterdefaultJ/ApJ/833/248/sourcesIntegrated intensities, peak intensities, column densities and abundances of N_2_H^+^, C_2_H, HC_3_N, HN^13^C (tables 1, 2, 3, 4 and 5) for the 87 Red Midcourse Space Experiment (MSX) Sources (RMSs)aC2H[0.09/2]? C_2_H abundancephys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampleUrquhart+ (2007, J/A+A/461/11) Group (G1)src.classcharMSX6CRMS (MSX) field name (GLLL.llll+BB.bbbb)meta.id;meta.maincharDist[1.6/15] Distance from Urquhart+ (2008, J/A+A/487/253)kpcpos.distance;pos.heliocentricfloatTd[17.6/40] Dust temperature from Guzman+ (2015, J/ApJ/815/130)Kphys.temperaturefloate_Td[0.4/11] Uncertainty in TdKstat.errorfloatlogNL[45/49.1]? log Lyman continuum flux estimatelog(s**-1)phot.flux.density;spect.continuumfloatnullableNH2[2.9/67] H_2_ column density from Guzman+ (2015, J/ApJ/815/130)1e+22cm**-2phys.columnDensityfloate_NH2[0.1/11] Uncertainty in NH21e+22cm**-2stat.error;phys.columnDensityfloatiN2H-1[0.3/9]? N_2_H^+^ Group 1 integrated intensity (G2)K.km/sphot.flux.density;em.radio;pos.lgfloatnullablee_iN2H-1[0.09/0.4]? Uncertainty in N2H-1K.km/sstat.errorfloatnullableiN2H-2[1.5/41]? N_2_H^+^ Group 2 integrated intensity (G2)K.km/sphot.flux.density;em.radio;pos.lgfloatnullablee_iN2H-2[0.1/1.1]? Uncertainty in N2H-2K.km/sstat.errorfloatnullableiC2H[1.4/11.6]? C_2_H, F=2-1 integrated intensityK.km/sphot.flux.density;em.radiofloatnullablee_iC2H[0.1/1.3]? Uncertainty in C2HK.km/sstat.errorfloatnullableiHC3N[0.8/10.5]? HC_3_N, J=10-9 integrated intensityK.km/sphot.flux.density;em.IR.Jfloatnullablee_iHC3N[0.1/0.4]? Uncertainty in HC3NK.km/sstat.errorfloatnullableiHN13C[0.9/4.2]? HN^13^C, J=1-0 integrated intensityK.km/sphot.flux.density;em.radiofloatnullablee_iHN13C[0.1/0.3]? Uncertainty in HN13CK.km/sstat.errorfloatnullableiHNC[1.5/36]? HNC, J=1-0 integrated intensityK.km/sphot.flux.density;em.radiofloatnullablee_iHNC[0.1/2.4]? Uncertainty in HNCK.km/sstat.errorfloatnullablepN2H-2[0.2/6]? N_2_H^+^ Group 2 peak intensities (G2)Kphys.temperaturefloatnullablepC2H-1[0.2/1.2]? C_2_H, F=1-0 peak intensitiesKphys.temperaturefloatnullablepC2H-2[0.3/2.3]? C_2_H, F=2-1 peak intensitiesKphys.temperaturefloatnullablepHC3N[0.3/2]? HC_3_N, J=10-9 peak intensitiesKphys.temperaturefloatnullablepHN13C[0.3/1]? HN^13^C, J=1-0 peak intensitiesKphys.temperaturefloatnullablepHNC[0.4/5.2]? HNC, J=1-0 peak intensitiesKphys.temperaturefloatnullabledN2H[0.3/7.8]? N_2_H^+^ column density1e+13cm**-2phys.columnDensityfloatnullablee_dN2H[0.03/1]? Uncertainty in dN2H1e+13cm**-2stat.errorfloatnullabledC2H[1.3/17]? C_2_H column density1e+14cm**-2phys.columnDensityfloatnullablee_dC2H[0.1/6]? Uncertainty in dC2H1e+14cm**-2stat.errorfloatnullabledHC3N[0.3/4.3]? HC_3_N column density1e+13cm**-2phys.columnDensityfloatnullablee_dHC3N[0.03/0.4]? Uncertainty in dHC3N1e+13cm**-2stat.errorfloatnullabledHNC[1.9/11.5]? HNC column density1e+14cm**-2phys.columnDensityfloatnullablee_dHNC[0.07/4]? Uncertainty in dHNC1e+14cm**-2stat.errorfloatnullableaN2H[0.03/0.9]? N_2_H^+^ abundancephys.abundfloatnullablee_aN2H[0.01/0.3]? Uncertainty in aN2Hstat.errorfloatnullablee_aC2H[0.02/0.8]? Uncertainty in aC2Hstat.errorfloatnullableaHC3N[0.4/1.7]? HC_3_N abundancephys.abundfloatnullablee_aHC3N[0.05/0.5]? Uncertainty in aHC3Nstat.errorfloatnullableaHNC[0.05/0.6]? HNC abundancephys.abundfloatnullablee_aHNC[0.01/0.3]? Uncertainty in aHNCstat.errorfloatnullableRMSDisplay the Red MSX Source Survey (RMS) data (Lumsden+, 2013, J/ApJS/208/11) within 15"meta.ref.urlintnullableU07Display data from Urquhart+, 2007, J/A+A/461/11meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Egan+, 2003, V/114 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Egan+, 2003, V/114 (declination part)degpos.eq.dec;meta.main