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Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields
Eswaraiah, Chakali1,2,3,4; Lai, Shih-Ping2; Ma, Yuehui5,6,7; Pandey, Anil K.8; Jose, Jessy9; Chen, Zhiwei5,6; Samal, Manash R.10; Wang, Jia-Wei1; Sharma, Saurabh8; Ojha, D. K.11
2019-04-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume875Issue:1Pages:24
Corresponding AuthorEswaraiah, Chakali(eswaraiahc@nao.cas.cn)
AbstractWe 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 degrees. Using the (CO)-C-12 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 similar to 56 +/- 10 mu G, the ratio of magnetic to turbulent pressure to be similar to 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 (CO)-C-12 map) of the cloud; in contrast, they are neither parallel nor perpendicular to the high-density core structures (traced by (CO)-C-13 and (CO)-O-18 maps). LDN 1225 hosts two 70 mu 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 (R-v = 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.
Keyworddust, extinction ISM: clouds local interstellar matter magnetic fields polarization
DOI10.3847/1538-4357/ab0a0c
WOS KeywordLATITUDE MOLECULAR CLOUD ; STAR-FORMATION ; INTERSTELLAR EXTINCTION ; INFRARED POLARIMETRY ; GRAIN ALIGNMENT ; CO SURVEY ; STELLAR CONTENTS ; STANDARD STARS ; OPEN CLUSTERS ; DENSE CORES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000464984900018
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24469
Collection中国科学院紫金山天文台
Corresponding AuthorEswaraiah, Chakali
Affiliation1.Natl Tsing Hua Univ, Inst Astron, 101,Sect 2,Kuang Fu Rd, Hsinchu 30013, Taiwan
2.Chinese Acad Sci, CAS Key Lab FAST, NAOC, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Datun Rd, Beijing 100101, Peoples R China
4.Indian Inst Astrophys, Koramangala 2nd Block, Bengaluru 560034, India
5.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
6.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
7.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
8.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, Uttarakhand Sta, India
9.Indian Inst Sci Educ & Res Tirupati, Karakambadi Rd,Mangalam PO, Tirupati 517507, Andhra Pradesh, India
10.Phys Res Lab, Ahmadabad 380009, Gujarat, India
11.Tata Inst Fundamental Res, Dept Astron & Astrophys, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India
Recommended Citation
GB/T 7714
Eswaraiah, Chakali,Lai, Shih-Ping,Ma, Yuehui,et al. Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields[J]. ASTROPHYSICAL JOURNAL,2019,875(1):24.
APA Eswaraiah, Chakali.,Lai, Shih-Ping.,Ma, Yuehui.,Pandey, Anil K..,Jose, Jessy.,...&Ojha, D. K..(2019).Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields.ASTROPHYSICAL JOURNAL,875(1),24.
MLA Eswaraiah, Chakali,et al."Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields".ASTROPHYSICAL JOURNAL 875.1(2019):24.
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