Interstellar Extinction, Polarization, and Grain Alignment in the Sh 2-185 (IC 59 and IC 63) Region
Optical and infrared continuum polarization from the interstellar medium is driven by radiative processes aligning the grains with the magnetic field. While a quantitative, predictive theory of radiative alignment torques (RATs) exists and has been extensively tested, several parameters of the theor...
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| Veröffentlicht in: | The Astronomical journal 2021-03, Vol.161 (3), p.149 |
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| creator | Soam, Archana Andersson, B-G Straižys, V. Caputo, Miranda Kazlauskas, A. Boyle, R. P. Janusz, R. Zdanavičius, J. Acosta-Pulido, J. A. |
| description | Optical and infrared continuum polarization from the interstellar medium is driven by radiative processes aligning the grains with the magnetic field. While a quantitative, predictive theory of radiative alignment torques (RATs) exists and has been extensively tested, several parameters of the theory remain to be fully constrained. In a recent paper, Medan & Andersson showed that the polarization efficiency (and therefore grain alignment efficiency) at different locations in the wall of the Local Bubble (LB) could be modeled as proportional to the integrated light intensity from the surrounding stars and OB associations. Here we probe that relationship at high radiation field intensities by studying the extinction and polarization in the two reflection nebulae IC 59 and IC 63 in the Sh 2-185 H
ii
region, illuminated by the B0 IV star
γ
Cassiopeia. We combine archival visual polarimetry with new seven-band photometry in the Vilnius system, to derive the polarization efficiency from the material. We find that the same linear relationship seen in the LB wall also applies to the Sh 2-185 region, strengthening the conclusion from the earlier study. |
| doi_str_mv | 10.3847/1538-3881/abdd3b |
| format | Article |
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ii
region, illuminated by the B0 IV star
γ
Cassiopeia. We combine archival visual polarimetry with new seven-band photometry in the Vilnius system, to derive the polarization efficiency from the material. We find that the same linear relationship seen in the LB wall also applies to the Sh 2-185 region, strengthening the conclusion from the earlier study.</description><identifier>ISSN: 0004-6256</identifier><identifier>ISSN: 1538-3881</identifier><identifier>EISSN: 1538-3881</identifier><identifier>DOI: 10.3847/1538-3881/abdd3b</identifier><language>eng</language><publisher>Madison: The American Astronomical Society</publisher><subject>Alignment ; Astronomy ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; EFFICIENCY ; Interstellar dust ; Interstellar extinction ; Interstellar matter ; Interstellar medium ; Light intensity ; Luminous intensity ; MAGNETIC FIELDS ; NEBULAE ; OTHER INSTRUMENTATION ; PHOTOMETRY ; POLARIMETRY ; POLARIZATION ; Radiation ; REFLECTION ; Reflection nebulae ; Starlight polarization ; STARS ; TORQUE</subject><ispartof>The Astronomical journal, 2021-03, Vol.161 (3), p.149</ispartof><rights>2021. The American Astronomical Society. All rights reserved.</rights><rights>Copyright IOP Publishing Mar 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c407t-992e68681091799ac196e104b5f0794037f404bbd48826d30761fa098cbb9363</citedby><cites>FETCH-LOGICAL-c407t-992e68681091799ac196e104b5f0794037f404bbd48826d30761fa098cbb9363</cites><orcidid>0000-0001-6717-0686 ; 0000-0001-9146-9274 ; 0000-0002-2957-3924 ; 0000-0002-6386-2906 ; 0000-0002-0433-9656</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-3881/abdd3b/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,780,784,885,27924,27925,38868,38890,53840,53867</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/1538-3881/abdd3b$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/23159159$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Soam, Archana</creatorcontrib><creatorcontrib>Andersson, B-G</creatorcontrib><creatorcontrib>Straižys, V.</creatorcontrib><creatorcontrib>Caputo, Miranda</creatorcontrib><creatorcontrib>Kazlauskas, A.</creatorcontrib><creatorcontrib>Boyle, R. P.</creatorcontrib><creatorcontrib>Janusz, R.</creatorcontrib><creatorcontrib>Zdanavičius, J.</creatorcontrib><creatorcontrib>Acosta-Pulido, J. A.</creatorcontrib><title>Interstellar Extinction, Polarization, and Grain Alignment in the Sh 2-185 (IC 59 and IC 63) Region</title><title>The Astronomical journal</title><addtitle>AJ</addtitle><addtitle>Astron. J</addtitle><description>Optical and infrared continuum polarization from the interstellar medium is driven by radiative processes aligning the grains with the magnetic field. While a quantitative, predictive theory of radiative alignment torques (RATs) exists and has been extensively tested, several parameters of the theory remain to be fully constrained. In a recent paper, Medan & Andersson showed that the polarization efficiency (and therefore grain alignment efficiency) at different locations in the wall of the Local Bubble (LB) could be modeled as proportional to the integrated light intensity from the surrounding stars and OB associations. Here we probe that relationship at high radiation field intensities by studying the extinction and polarization in the two reflection nebulae IC 59 and IC 63 in the Sh 2-185 H
ii
region, illuminated by the B0 IV star
γ
Cassiopeia. We combine archival visual polarimetry with new seven-band photometry in the Vilnius system, to derive the polarization efficiency from the material. We find that the same linear relationship seen in the LB wall also applies to the Sh 2-185 region, strengthening the conclusion from the earlier study.</description><subject>Alignment</subject><subject>Astronomy</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>EFFICIENCY</subject><subject>Interstellar dust</subject><subject>Interstellar extinction</subject><subject>Interstellar matter</subject><subject>Interstellar medium</subject><subject>Light intensity</subject><subject>Luminous intensity</subject><subject>MAGNETIC FIELDS</subject><subject>NEBULAE</subject><subject>OTHER INSTRUMENTATION</subject><subject>PHOTOMETRY</subject><subject>POLARIMETRY</subject><subject>POLARIZATION</subject><subject>Radiation</subject><subject>REFLECTION</subject><subject>Reflection nebulae</subject><subject>Starlight polarization</subject><subject>STARS</subject><subject>TORQUE</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp1kM1LAzEQxYMoWKt3jwE9KLia2WSzyVGKHwVBUe8hm83alJqtSQrqX2_qir0oDGTe8HuP8BA6BHJOBasvoKKioELAhW7aljZbaPR72kYjQggreFnxXbQX45wQAEHYCJmpTzbEZBcLHfDVe3LeJNf7M_zQ54v71IPSvsU3QTuPLxfuxb9an3AWaWbx0wyXBYgKn0wnuJLfaN44PcWP9iW799FOpxfRHvy8Y_R8ffU8uS3u7m-mk8u7wjBSp0LK0nLBBRAJtZTagOQWCGuqjtSSEVp3LKumZUKUvKWk5tBpIoVpGkk5HaOjIbaPyaloXLJmZnrvrUmqpFDJPBtqGfq3lY1JzftV8PlfqmSSScqAQabIQJnQxxhsp5bBverwoYCodd9qXa5al6uGvrPleLC4frnJ1HMFHBRVwKRatl3Gzv7A_k39AvzhiPY</recordid><startdate>20210301</startdate><enddate>20210301</enddate><creator>Soam, Archana</creator><creator>Andersson, B-G</creator><creator>Straižys, V.</creator><creator>Caputo, Miranda</creator><creator>Kazlauskas, A.</creator><creator>Boyle, R. P.</creator><creator>Janusz, R.</creator><creator>Zdanavičius, J.</creator><creator>Acosta-Pulido, J. A.</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0001-6717-0686</orcidid><orcidid>https://orcid.org/0000-0001-9146-9274</orcidid><orcidid>https://orcid.org/0000-0002-2957-3924</orcidid><orcidid>https://orcid.org/0000-0002-6386-2906</orcidid><orcidid>https://orcid.org/0000-0002-0433-9656</orcidid></search><sort><creationdate>20210301</creationdate><title>Interstellar Extinction, Polarization, and Grain Alignment in the Sh 2-185 (IC 59 and IC 63) Region</title><author>Soam, Archana ; Andersson, B-G ; Straižys, V. ; Caputo, Miranda ; Kazlauskas, A. ; Boyle, R. P. ; Janusz, R. ; Zdanavičius, J. ; Acosta-Pulido, J. 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ii
region, illuminated by the B0 IV star
γ
Cassiopeia. We combine archival visual polarimetry with new seven-band photometry in the Vilnius system, to derive the polarization efficiency from the material. We find that the same linear relationship seen in the LB wall also applies to the Sh 2-185 region, strengthening the conclusion from the earlier study.</abstract><cop>Madison</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-3881/abdd3b</doi><tpages>17</tpages><orcidid>https://orcid.org/0000-0001-6717-0686</orcidid><orcidid>https://orcid.org/0000-0001-9146-9274</orcidid><orcidid>https://orcid.org/0000-0002-2957-3924</orcidid><orcidid>https://orcid.org/0000-0002-6386-2906</orcidid><orcidid>https://orcid.org/0000-0002-0433-9656</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Alignment Astronomy ASTROPHYSICS, COSMOLOGY AND ASTRONOMY EFFICIENCY Interstellar dust Interstellar extinction Interstellar matter Interstellar medium Light intensity Luminous intensity MAGNETIC FIELDS NEBULAE OTHER INSTRUMENTATION PHOTOMETRY POLARIMETRY POLARIZATION Radiation REFLECTION Reflection nebulae Starlight polarization STARS TORQUE |
| title | Interstellar Extinction, Polarization, and Grain Alignment in the Sh 2-185 (IC 59 and IC 63) Region |
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