Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields
We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ∼200 stars have been used to (a) constrain the distance of LDN 1225 as 830 83 pc, (b) det...
Gespeichert in:
| Veröffentlicht in: | The Astrophysical journal 2019-04, Vol.875 (1), p.64 |
|---|---|
| Hauptverfasser: | , , , , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | |
|---|---|
| container_issue | 1 |
| container_start_page | 64 |
| container_title | The Astrophysical journal |
| container_volume | 875 |
| creator | Eswaraiah, Chakali Lai, Shih-Ping Ma, Yuehui Pandey, Anil K. Jose, Jessy Chen, Zhiwei Samal, Manash R. Wang, Jia-Wei Sharma, Saurabh Ojha, D. K. |
| description | We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ∼200 stars have been used to (a) constrain the distance of LDN 1225 as 830 83 pc, (b) determine the contribution of interstellar polarization, and (c) characterize the dust properties and delineate the magnetic field (B-field) morphology of LDN 1225. We find that B-fields are more organized and exhibit a small dispersion of 12°. Using the 12CO molecular line data from the Purple Mountain Observatory, along with the column density and dispersion in B-fields, we estimate the B-field strength to be ∼56 10 G, the ratio of magnetic to turbulent pressure to be ∼3 2, and the ratio of mass to magnetic flux (in units of the critical value) to be |
| doi_str_mv | 10.3847/1538-4357/ab0a0c |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_iop_j</sourceid><recordid>TN_cdi_iop_journals_10_3847_1538_4357_ab0a0c</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2365803695</sourcerecordid><originalsourceid>FETCH-LOGICAL-c445t-1f1b550c8b0466ed9b74da01d7c6033877b77713474569ae6b1c4478bd9568b43</originalsourceid><addsrcrecordid>eNp9kEtPwzAQhC0EEqVw52gJjg2142e4IfqgUoAeQOJm2YnTpoQ4JG6Bf0_SVnBBnFazmpnVfgCcY3RFJBVDzIgMKGFiqA3SKDkAvZ_VIeghhGjAiXg5BidNs-pkGEU9sJm7Qtf5m_V1nkBdpnC-dN7t9azc2MbnC-1zV0KXQb-0cKTrVzgtnFkXFsajB4jDkF3DUd54XSZ2AMefPi-TbSTWH4Nt671elNa3lZPcFmlzCo4yXTT2bD_74Hkyfrq9C-LH6ez2Jg4SSpkPcIYNYyiRBlHObRoZQVONcCoSjgiRQhghBCZUUMYjbbnBbVBIk0aMS0NJH1zseqvava_bX9TKreuyPalCwplEhEesdaGdK6ld09Q2U1WLRNdfCiPV0VUdStWhVDu6bWSwi-Su-u38x375h11XKyUFU1hxqqo0I9_ArYak</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2365803695</pqid></control><display><type>article</type><title>Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields</title><source>IOP Publishing Free Content</source><source>Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals</source><source>Alma/SFX Local Collection</source><creator>Eswaraiah, Chakali ; Lai, Shih-Ping ; Ma, Yuehui ; Pandey, Anil K. ; Jose, Jessy ; Chen, Zhiwei ; Samal, Manash R. ; Wang, Jia-Wei ; Sharma, Saurabh ; Ojha, D. K.</creator><creatorcontrib>Eswaraiah, Chakali ; Lai, Shih-Ping ; Ma, Yuehui ; Pandey, Anil K. ; Jose, Jessy ; Chen, Zhiwei ; Samal, Manash R. ; Wang, Jia-Wei ; Sharma, Saurabh ; Ojha, D. K.</creatorcontrib><description>We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ∼200 stars have been used to (a) constrain the distance of LDN 1225 as 830 83 pc, (b) determine the contribution of interstellar polarization, and (c) characterize the dust properties and delineate the magnetic field (B-field) morphology of LDN 1225. We find that B-fields are more organized and exhibit a small dispersion of 12°. Using the 12CO molecular line data from the Purple Mountain Observatory, along with the column density and dispersion in B-fields, we estimate the B-field strength to be ∼56 10 G, the ratio of magnetic to turbulent pressure to be ∼3 2, and the ratio of mass to magnetic flux (in units of the critical value) to be <1. These results indicate the dominant role of B-fields in comparison to turbulence and gravity in rendering the cloud support. B-fields are aligned parallel to the low-density parts (traced by a 12CO map) of the cloud; in contrast, they are neither parallel nor perpendicular to the high-density core structures (traced by 13CO and C18O maps). LDN 1225 hosts two 70 m sources, which seem to be low-mass Class 0 sources. The ratio of total to selective extinction derived using optical and near-infrared photometric data is found to be anomalous (RV = 3.4), suggesting the growth of dust grains in LDN 1225. The polarization efficiency of dust grains follows a power law with an index of −0.7, implying that optical polarimetry traces B-fields in the outer parts of the cloud.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/ab0a0c</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>Astrophysics ; Clouds ; Density ; Dispersion ; Dust ; dust, extinction ; Extinction ; Field strength ; Infrared photometry ; Interstellar ; ISM: clouds ; local interstellar matter ; Magnetic fields ; Magnetic flux ; Magnetic properties ; Morphology ; Mountains ; Photometry ; Polarimetry ; Polarization ; Power efficiency ; Power law ; Turbulence</subject><ispartof>The Astrophysical journal, 2019-04, Vol.875 (1), p.64</ispartof><rights>2019. The American Astronomical Society.</rights><rights>Copyright IOP Publishing Apr 10, 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c445t-1f1b550c8b0466ed9b74da01d7c6033877b77713474569ae6b1c4478bd9568b43</citedby><cites>FETCH-LOGICAL-c445t-1f1b550c8b0466ed9b74da01d7c6033877b77713474569ae6b1c4478bd9568b43</cites><orcidid>0000-0003-4761-6139 ; 0000-0001-5522-486X ; 0000-0001-5731-3057 ; 0000-0003-0849-0692 ; 0000-0002-8051-5228 ; 0000-0002-6668-974X ; 0000-0001-9312-3816</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/ab0a0c/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,776,780,27901,27902,38867,53842</link.rule.ids></links><search><creatorcontrib>Eswaraiah, Chakali</creatorcontrib><creatorcontrib>Lai, Shih-Ping</creatorcontrib><creatorcontrib>Ma, Yuehui</creatorcontrib><creatorcontrib>Pandey, Anil K.</creatorcontrib><creatorcontrib>Jose, Jessy</creatorcontrib><creatorcontrib>Chen, Zhiwei</creatorcontrib><creatorcontrib>Samal, Manash R.</creatorcontrib><creatorcontrib>Wang, Jia-Wei</creatorcontrib><creatorcontrib>Sharma, Saurabh</creatorcontrib><creatorcontrib>Ojha, D. K.</creatorcontrib><title>Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ∼200 stars have been used to (a) constrain the distance of LDN 1225 as 830 83 pc, (b) determine the contribution of interstellar polarization, and (c) characterize the dust properties and delineate the magnetic field (B-field) morphology of LDN 1225. We find that B-fields are more organized and exhibit a small dispersion of 12°. Using the 12CO molecular line data from the Purple Mountain Observatory, along with the column density and dispersion in B-fields, we estimate the B-field strength to be ∼56 10 G, the ratio of magnetic to turbulent pressure to be ∼3 2, and the ratio of mass to magnetic flux (in units of the critical value) to be <1. These results indicate the dominant role of B-fields in comparison to turbulence and gravity in rendering the cloud support. B-fields are aligned parallel to the low-density parts (traced by a 12CO map) of the cloud; in contrast, they are neither parallel nor perpendicular to the high-density core structures (traced by 13CO and C18O maps). LDN 1225 hosts two 70 m sources, which seem to be low-mass Class 0 sources. The ratio of total to selective extinction derived using optical and near-infrared photometric data is found to be anomalous (RV = 3.4), suggesting the growth of dust grains in LDN 1225. The polarization efficiency of dust grains follows a power law with an index of −0.7, implying that optical polarimetry traces B-fields in the outer parts of the cloud.</description><subject>Astrophysics</subject><subject>Clouds</subject><subject>Density</subject><subject>Dispersion</subject><subject>Dust</subject><subject>dust, extinction</subject><subject>Extinction</subject><subject>Field strength</subject><subject>Infrared photometry</subject><subject>Interstellar</subject><subject>ISM: clouds</subject><subject>local interstellar matter</subject><subject>Magnetic fields</subject><subject>Magnetic flux</subject><subject>Magnetic properties</subject><subject>Morphology</subject><subject>Mountains</subject><subject>Photometry</subject><subject>Polarimetry</subject><subject>Polarization</subject><subject>Power efficiency</subject><subject>Power law</subject><subject>Turbulence</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>O3W</sourceid><recordid>eNp9kEtPwzAQhC0EEqVw52gJjg2142e4IfqgUoAeQOJm2YnTpoQ4JG6Bf0_SVnBBnFazmpnVfgCcY3RFJBVDzIgMKGFiqA3SKDkAvZ_VIeghhGjAiXg5BidNs-pkGEU9sJm7Qtf5m_V1nkBdpnC-dN7t9azc2MbnC-1zV0KXQb-0cKTrVzgtnFkXFsajB4jDkF3DUd54XSZ2AMefPi-TbSTWH4Nt671elNa3lZPcFmlzCo4yXTT2bD_74Hkyfrq9C-LH6ez2Jg4SSpkPcIYNYyiRBlHObRoZQVONcCoSjgiRQhghBCZUUMYjbbnBbVBIk0aMS0NJH1zseqvava_bX9TKreuyPalCwplEhEesdaGdK6ld09Q2U1WLRNdfCiPV0VUdStWhVDu6bWSwi-Su-u38x375h11XKyUFU1hxqqo0I9_ArYak</recordid><startdate>20190410</startdate><enddate>20190410</enddate><creator>Eswaraiah, Chakali</creator><creator>Lai, Shih-Ping</creator><creator>Ma, Yuehui</creator><creator>Pandey, Anil K.</creator><creator>Jose, Jessy</creator><creator>Chen, Zhiwei</creator><creator>Samal, Manash R.</creator><creator>Wang, Jia-Wei</creator><creator>Sharma, Saurabh</creator><creator>Ojha, D. K.</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><scope>O3W</scope><scope>TSCCA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-4761-6139</orcidid><orcidid>https://orcid.org/0000-0001-5522-486X</orcidid><orcidid>https://orcid.org/0000-0001-5731-3057</orcidid><orcidid>https://orcid.org/0000-0003-0849-0692</orcidid><orcidid>https://orcid.org/0000-0002-8051-5228</orcidid><orcidid>https://orcid.org/0000-0002-6668-974X</orcidid><orcidid>https://orcid.org/0000-0001-9312-3816</orcidid></search><sort><creationdate>20190410</creationdate><title>Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields</title><author>Eswaraiah, Chakali ; Lai, Shih-Ping ; Ma, Yuehui ; Pandey, Anil K. ; Jose, Jessy ; Chen, Zhiwei ; Samal, Manash R. ; Wang, Jia-Wei ; Sharma, Saurabh ; Ojha, D. K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c445t-1f1b550c8b0466ed9b74da01d7c6033877b77713474569ae6b1c4478bd9568b43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Astrophysics</topic><topic>Clouds</topic><topic>Density</topic><topic>Dispersion</topic><topic>Dust</topic><topic>dust, extinction</topic><topic>Extinction</topic><topic>Field strength</topic><topic>Infrared photometry</topic><topic>Interstellar</topic><topic>ISM: clouds</topic><topic>local interstellar matter</topic><topic>Magnetic fields</topic><topic>Magnetic flux</topic><topic>Magnetic properties</topic><topic>Morphology</topic><topic>Mountains</topic><topic>Photometry</topic><topic>Polarimetry</topic><topic>Polarization</topic><topic>Power efficiency</topic><topic>Power law</topic><topic>Turbulence</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Eswaraiah, Chakali</creatorcontrib><creatorcontrib>Lai, Shih-Ping</creatorcontrib><creatorcontrib>Ma, Yuehui</creatorcontrib><creatorcontrib>Pandey, Anil K.</creatorcontrib><creatorcontrib>Jose, Jessy</creatorcontrib><creatorcontrib>Chen, Zhiwei</creatorcontrib><creatorcontrib>Samal, Manash R.</creatorcontrib><creatorcontrib>Wang, Jia-Wei</creatorcontrib><creatorcontrib>Sharma, Saurabh</creatorcontrib><creatorcontrib>Ojha, D. K.</creatorcontrib><collection>IOP Publishing Free Content</collection><collection>IOPscience (Open Access)</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Eswaraiah, Chakali</au><au>Lai, Shih-Ping</au><au>Ma, Yuehui</au><au>Pandey, Anil K.</au><au>Jose, Jessy</au><au>Chen, Zhiwei</au><au>Samal, Manash R.</au><au>Wang, Jia-Wei</au><au>Sharma, Saurabh</au><au>Ojha, D. K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields</atitle><jtitle>The Astrophysical journal</jtitle><stitle>APJ</stitle><addtitle>Astrophys. J</addtitle><date>2019-04-10</date><risdate>2019</risdate><volume>875</volume><issue>1</issue><spage>64</spage><pages>64-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ∼200 stars have been used to (a) constrain the distance of LDN 1225 as 830 83 pc, (b) determine the contribution of interstellar polarization, and (c) characterize the dust properties and delineate the magnetic field (B-field) morphology of LDN 1225. We find that B-fields are more organized and exhibit a small dispersion of 12°. Using the 12CO molecular line data from the Purple Mountain Observatory, along with the column density and dispersion in B-fields, we estimate the B-field strength to be ∼56 10 G, the ratio of magnetic to turbulent pressure to be ∼3 2, and the ratio of mass to magnetic flux (in units of the critical value) to be <1. These results indicate the dominant role of B-fields in comparison to turbulence and gravity in rendering the cloud support. B-fields are aligned parallel to the low-density parts (traced by a 12CO map) of the cloud; in contrast, they are neither parallel nor perpendicular to the high-density core structures (traced by 13CO and C18O maps). LDN 1225 hosts two 70 m sources, which seem to be low-mass Class 0 sources. The ratio of total to selective extinction derived using optical and near-infrared photometric data is found to be anomalous (RV = 3.4), suggesting the growth of dust grains in LDN 1225. The polarization efficiency of dust grains follows a power law with an index of −0.7, implying that optical polarimetry traces B-fields in the outer parts of the cloud.</abstract><cop>Philadelphia</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-4357/ab0a0c</doi><tpages>24</tpages><orcidid>https://orcid.org/0000-0003-4761-6139</orcidid><orcidid>https://orcid.org/0000-0001-5522-486X</orcidid><orcidid>https://orcid.org/0000-0001-5731-3057</orcidid><orcidid>https://orcid.org/0000-0003-0849-0692</orcidid><orcidid>https://orcid.org/0000-0002-8051-5228</orcidid><orcidid>https://orcid.org/0000-0002-6668-974X</orcidid><orcidid>https://orcid.org/0000-0001-9312-3816</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-637X |
| ispartof | The Astrophysical journal, 2019-04, Vol.875 (1), p.64 |
| issn | 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_iop_journals_10_3847_1538_4357_ab0a0c |
| source | IOP Publishing Free Content; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Astrophysics Clouds Density Dispersion Dust dust, extinction Extinction Field strength Infrared photometry Interstellar ISM: clouds local interstellar matter Magnetic fields Magnetic flux Magnetic properties Morphology Mountains Photometry Polarimetry Polarization Power efficiency Power law Turbulence |
| title | Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-09T06%3A04%3A00IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_iop_j&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Polarimetric%20and%20Photometric%20Investigation%20of%20the%20Dark%20Globule%20LDN%201225:%20Distance,%20Extinction%20Law,%20and%20Magnetic%20Fields&rft.jtitle=The%20Astrophysical%20journal&rft.au=Eswaraiah,%20Chakali&rft.date=2019-04-10&rft.volume=875&rft.issue=1&rft.spage=64&rft.pages=64-&rft.issn=0004-637X&rft.eissn=1538-4357&rft_id=info:doi/10.3847/1538-4357/ab0a0c&rft_dat=%3Cproquest_iop_j%3E2365803695%3C/proquest_iop_j%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2365803695&rft_id=info:pmid/&rfr_iscdi=true |