J/ApJ/783/1ivo://CDS.VizieR/J/ApJ/783/1doi:10.26093/cds/vizier.17830001CDSSantos F.P.Franco G.A.P.Roman-Lopes A.Reis W.Roman-Zuniga C.G.2017-01-23T22:00:00Z2016-03-23T13:29:47ZCDS support team

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

cds-question@unistra.frinterstellar-mediumh-ii-regionspolarimetrySh 2-29 is a conspicuous star-forming region marked by the presence of massive embedded stars as well as several notable interstellar structures. In this research, our goals were to determine the role of magnetic fields and to study the size distribution of interstellar dust particles within this turbulent environment. We have used a set of optical and near-infrared polarimetric data obtained at OPD/LNA (Brazil) and CTIO (Chile), correlated with extinction maps, Two Micron All Sky Survey data, and images from the Digitized Sky Survey and Spitzer. The region's most striking feature is a swept out interstellar cavity whose polarimetric maps indicate that magnetic field lines were dragged outward, piling up along its borders. This led to a higher magnetic strength value ({approx}400{mu}G) and an abrupt increase in polarization degree, probably due to an enhancement in alignment efficiency. Furthermore, dense cloud fragmentations with peak A_V_ between 20 and 37mag were probably triggered by its expansion. The presence of 24{mu}m point-like sources indicates possible newborn stars inside this dense environment. A statistical analysis of the angular dispersion function revealed areas where field lines are aligned in a well-ordered pattern, seemingly due to compression effects from the HII region expansion. Finally, Serkowski function fits were used to study the ratio of the total-to-selective extinction, revealing a dual population of anomalous grain particle sizes. This trend suggests that both effects of coagulation and fragmentation of interstellar grains are present in the region.2014ApJ...783....1Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/783/1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/20 : Catalogue of HII Regions (Sharpless 1959)J/ApJ/751/138 : VRIJHK photometry of IRAS 09149-4743 region (Santos+, 2012)J/ApJ/728/104 : Optical polarization for 878 Hipparcos stars (Santos+ 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/783/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/783/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/783/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/783/1https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/783/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/783/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/783/1/table1 (Polarimetric data set for Sh 2-29 at optical (V, R, I) and near-IR bands (H))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/783/1/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/783/1/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/783/1/table1?GETtext/xml+votable180.050000true272.1476667-24.29288890.0055555555555555566/28889 28892 28894https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/783/1?format=asciidefaultJ/ApJ/783/1/table1Polarimetric data set for Sh 2-29 at optical (V, R, I) and near-IR bands (H)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[1/5254] Running sequence number of the starmeta.numberintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainPV[0.2/16]? The V band degree of polarization (1)%phys.polarization.linearfloatnullablee_PV[0.04/3.7]? Uncertainty in PV (1)%stat.errorfloatnullablePAV[0.4/172.1]? The V band polarization angle (1)degpos.posAng;phys.polarizationfloatnullablee_PAV[2.5/14.5]? Uncertainty in PAV (1)degstat.errorfloatnullablePR[0.25/46]? The R Band degree of polarization (1)%phys.polarization.linearfloatnullablee_PR[0.01/12.75]? Uncertainty in PR (1)%stat.errorfloatnullablePAR[0.2/180]? The R band polarization angle (1)degpos.posAng;phys.polarizationfloatnullablee_PAR[0.5/14.3]? Uncertainty in PAR (1)degstat.errorfloatnullablePI[0.1/17.9]? The I Band degree of polarization (1)%phys.polarization.linearfloatnullablee_PI[0.06/5.8]? Uncertainty in PI (1)%stat.errorfloatnullablePAI[0.2/179.8]? The I band polarization angle (1)degpos.posAng;phys.polarizationfloatnullablee_PAI[1.8/14.2]? Uncertainty in PAI (1)degstat.errorfloatnullablePH[0.1/13.8]? The H Band degree of polarization (1)%phys.polarization.linearfloatnullablee_PH[0.01/5.2]? Uncertainty in PH (1)%stat.errorfloatnullablePAH[0.1/180]? The H band polarization angle (1)degpos.posAng;phys.polarizationfloatnullablee_PAH[6/15.5]? Uncertainty in PAH (1)degstat.errorfloatnullable