J/ApJ/836/199ivo://CDS.VizieR/J/ApJ/836/199doi:10.26093/cds/vizier.18360199CDSHoq S.Clemens D.P.Guzman A.E.Cashman L.R.2017-12-07T07:15:28Z2017-11-06T08:58:58ZCDS support team

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

cds-question@unistra.frpolarimetryinfrared-photometrygalaxy-kinematicsmagnetic-fieldsmolecular-cloudsThe importance of the magnetic (B) field in the formation of infrared dark clouds (IRDCs) and massive stars is an ongoing topic of investigation. We studied the plane-of-sky B field for one IRDC, G028.23-00.19, to understand the interaction between the field and the cloud. We used near-IR background starlight polarimetry to probe the B field and performed several observational tests to assess the field importance. The polarimetric data, taken with the Mimir instrument, consisted of H-band and K-band observations, totaling 17160 stellar measurements. We traced the plane-of-sky B-field morphology with respect to the sky-projected cloud elongation. We also found the relationship between the estimated B-field strength and gas volume density, and we computed estimates of the normalized mass-to-magnetic flux ratio. The B-field orientation with respect to the cloud did not show a preferred alignment, but it did exhibit a large-scale pattern. The plane-of-sky B-field strengths ranged from 10 to 165{mu}G, and the B-field strength dependence on density followed a power law with an index consistent with 2/3. The mass-to-magnetic flux ratio also increased as a function of density. The relative orientations and relationship between the B field and density imply that the B field was not dynamically important in the formation of the IRDC. The increase in mass-to-flux ratio as a function of density, though, indicates a dynamically important B field. Therefore, it is unclear whether the B field influenced the formation of G28.23. However, it is likely that the presence of the IRDC changed the local B-field morphology.2017ApJ...836..199Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/199CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/226 : Stellar polarization catalogs agglomeration (Heiles, 2000)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)J/ApJS/186/406 : 350um polarimetry from CSO (Dotson+, 2010)J/ApJ/723/1019 : Galactic SFR and gas surface densities (Heiderman+, 2010)J/ApJ/741/21 : Polarization of stars in Taurus (Chapman+, 2011)J/ApJ/756/60 : A 3mm line survey in 37 IR dark clouds (Sanhueza+, 2012)J/MNRAS/424/2442 : Catalog of bubbles from Milky Way Project (Simpson+, 2012)J/A+A/549/A45 : ATLASGAL Compact Source Catalog: 330<l<21 (Contreras+, 2013)J/ApJ/793/126 : L204 - Cloud 3 polarimetry and photometry (Cashman+, 2014)J/ApJS/213/13 : 1.3mm polarization maps of star-forming cores (Hull+, 2014)J/ApJ/815/130 : High-mass molecular clumps from MALT90 (Guzman+, 2015)http://gpips0.bu.edu/Data_Release/ : GPIPS data releaseshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/199https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/199http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/199https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/199https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/199http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/199GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/836/199/table3 (Properties of the pixels in the B-field map)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/199/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/199/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/199/table3?GETtext/xml+votable180.050000true280.812597-4.3461580.005555555555555556Cone search capability for table J/ApJ/836/199/stars (Stellar polarimetric and photometric properties of G28.23 field of view (tables 1 and 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/199/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/199/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/199/stars?GETtext/xml+votable180.050000true280.899287-4.4492580.0055555555555555566/30245 302563.9193497546148093e-20 4.923046907857898e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/836/199?format=asciiInfrareddefaultJ/ApJ/836/199/table3Properties of the pixels in the B-field maprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic Longitude of Pixeldegpos.galactic.lonGLATGalactic Latitude of Pixeldegpos.galactic.latPA[8/38]? Position Angle Dispersiondegpos.posAngfloatnullablee_PA[1/18]? Uncertainty in PAdegstat.errorfloatnullablen(H2)[0/1192]? Volume Density, H2 / cm^3^cm**-3phys.densityintnullablee_n(H2)[0/238]? Uncertainty in n(H2)cm**-3stat.errorintnullablesig(13CO)[1/15]? ^13^CO gas velocity dispersionkm/sphys.veloc.dispersion;spect.linefloatnullablee_sig(13CO)[0/19]? Uncertainty in sig(13CO)km/sstat.errorfloatnullableBPOS[13/164]? plane-of-sky B-field strength, in microGauss units1e-10Tphys.magFieldfloatnullablee_BPOS[3/43]? Uncertainty in BPOS1e-10Tstat.errorfloatnullableMphip[0.09/7.6]? normalized Mass-to-Flux ratiostat.fit.omcfloatnullablee_Mphip[0.03/2]? Uncertainty in Mphipstat.errorfloatnullableLimLimits (1)meta.codechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/836/199/starsStellar polarimetric and photometric properties of G28.23 field of view (tables 1 and 2)e_(H-K)? Uncertainty in (H-K)magstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqPolarimetric Catalog Star Numbermeta.id;meta.mainintGLONGalactic Longitudedegpos.galactic.lonindexedGLATGalactic latitudedegpos.galactic.latindexedfPosBand Match (1)meta.codecharPk? K-band Polarization Percent%phys.polarizationfloatnullablee_Pk? Uncertainty in Pk%stat.errorfloatnullableGPAk[63/243]? K-band Galactic Polarization Position Angledegpos.posAng;phys.polarizationfloatnullablee_GPAk[1/178]? Uncertainty in GPAkdegstat.errorfloatnullableQk[-83/91]? K-band Stokes Q parameter%phys.polarization.stokes;arith.ratiofloatnullablee_Qk[0/100]? Uncertainty in Qk%stat.errorfloatnullableUk[-96/96]? K-band Stokes U parameter%phys.polarization.stokes;arith.ratiofloatnullablee_Uk? Uncertainty in Uk%stat.errorfloatnullablePh? H-band Polarization Percent%phys.polarizationfloatnullablee_Ph? Uncertainty in Ph%stat.errorfloatnullableGPAh[62/243]? H-band Galactic Polarization Position Angledegpos.posAng;phys.polarizationfloatnullablee_GPAh[0.8/179]? Uncertainty in GPAhdegstat.errorfloatnullableQh[-100/100]? H-band Stokes Q parameter%phys.polarization.stokes;arith.ratiofloatnullablee_Qh? Uncertainty in Qh%stat.errorfloatnullableUh[-100/94]? H-band Stokes U parameter%phys.polarization.stokes;arith.ratiofloatnullablee_Uh? Uncertainty in Uh%stat.errorfloatnullableANameNIR source cross-match designation (1)meta.idcharJmag[6.4/21.6]? J-Band magnitude in NIR source catalogmagphot.mag;em.IR.Jfloatnullablee_Jmag[0.001/0.9]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? H-Band magnitude in NIR source catalogmagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in H-Band magnitudemagstat.error;phot.mag;em.IR.HfloatnullableKmag[4.3/17.4]? K-Band magnitude in NIR source catalogmagphot.mag;em.IR.Kfloatnullablee_Kmag[0.001/0.3]? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[4.5]mag[6.5/14.6]? GLIMPSE IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]mag[0.02/0.4]? Uncertainty in [4.5]magmagstat.error;phot.magfloatnullable(H-K)? H-K color indexmagphot.color;em.IR.H;em.IR.Kfloatnullable(H-4.5)? H-4.5 color indexmagphot.color;em.IR;em.IRfloatnullablee_(H-4.5)? Uncertainty in (H-4.5)magstat.errorfloatnullableAv[0/75] Extinction in V-Bandmagphys.absorption;em.opt.Vfloate_Av[0/5] Uncertainty in V-Band Extinctionmagstat.errorfloatMethColor excess extinction method ("H-K": 4843 occurrences, or "H-4.5")meta.codecharRDRelative Distance classification (2)meta.codecharGLIMPSEDisplay the GLIMPSE data (II/293) within 1"meta.ref.urlintnullable_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed