THE EFFICIENCY AND WAVELENGTH DEPENDENCE OF NEAR-INFRARED INTERSTELLAR POLARIZATION TOWARD THE GALACTIC CENTER
Near-infrared polarimetric imaging observations toward the Galactic center (GC) have been carried out to examine the efficiency and wavelength dependence of interstellar polarization. We examined the polarization efficiency, defined as the ratio of the degree of polarization to color excess. The int...
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| Veröffentlicht in: | The Astronomical journal 2013-04, Vol.145 (4), p.1-13 |
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| creator | Hatano, Hirofumi Nishiyama, Shogo Kurita, Mikio Kanai, Saori Nakajima, Yasushi Nagata, Tetsuya Tamura, Motohide Kandori, Ryo Kato, Daisuke Sato, Yaeko Yoshikawa, Tatsuhito Suenaga, Takuya Sato, Shuji |
| description | Near-infrared polarimetric imaging observations toward the Galactic center (GC) have been carried out to examine the efficiency and wavelength dependence of interstellar polarization. We examined the polarization efficiency, defined as the ratio of the degree of polarization to color excess. The interstellar medium between the GC and us shows a polarization efficiency lower than that in the Galactic disk by a factor of three. Moreover we investigated the spatial variation of the polarization efficiency by comparing it with that of the color excess, degree of polarization, and position angle. The polarization efficiency anticorrelates with dispersions of position angles. The low polarization efficiency and its spatial variation can be explained by the differences in the magnetic field directions along the line of sight. The wavelength dependence of interstellar polarization exhibits flattening toward longer wavelengths in the range of 1.25-2.14 mu m. The flattening would be caused by aligned large-size dust grains. |
| doi_str_mv | 10.1088/0004-6256/145/4/105 |
| format | Article |
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We examined the polarization efficiency, defined as the ratio of the degree of polarization to color excess. The interstellar medium between the GC and us shows a polarization efficiency lower than that in the Galactic disk by a factor of three. Moreover we investigated the spatial variation of the polarization efficiency by comparing it with that of the color excess, degree of polarization, and position angle. The polarization efficiency anticorrelates with dispersions of position angles. The low polarization efficiency and its spatial variation can be explained by the differences in the magnetic field directions along the line of sight. The wavelength dependence of interstellar polarization exhibits flattening toward longer wavelengths in the range of 1.25-2.14 mu m. 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We examined the polarization efficiency, defined as the ratio of the degree of polarization to color excess. The interstellar medium between the GC and us shows a polarization efficiency lower than that in the Galactic disk by a factor of three. Moreover we investigated the spatial variation of the polarization efficiency by comparing it with that of the color excess, degree of polarization, and position angle. The polarization efficiency anticorrelates with dispersions of position angles. The low polarization efficiency and its spatial variation can be explained by the differences in the magnetic field directions along the line of sight. The wavelength dependence of interstellar polarization exhibits flattening toward longer wavelengths in the range of 1.25-2.14 mu m. The flattening would be caused by aligned large-size dust grains.</description><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>COLOR</subject><subject>DISPERSIONS</subject><subject>DUSTS</subject><subject>EFFICIENCY</subject><subject>Flattening</subject><subject>FREQUENCY DEPENDENCE</subject><subject>GALAXIES</subject><subject>GALAXY NUCLEI</subject><subject>Interstellar</subject><subject>Interstellar matter</subject><subject>Line of sight</subject><subject>MAGNETIC FIELD CONFIGURATIONS</subject><subject>MAGNETIC FIELDS</subject><subject>POLARIZATION</subject><subject>RANDOMNESS</subject><subject>STARS</subject><subject>WAVELENGTHS</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNkc1Kw0AURgdRsFafwM2AGzcx85tMlkMyaQMhKTFadDOkkwQrbVMz6cK3N6Hi2s29cL_Dx4UDwD1GTxgJ4SKEmOMR7rmYcZe5GPELMMOcCocKgS_B7I-4BjfWfiKEsUBsBg7lUkEVx0mYqCx8gzKL4Fq-qlRli3IJI7VSWTQmCuYxzJQsnCSLC1moCCZZqYrnUqWpLOAqH2fyLsskz2CZr2URwal6IVMZlkkIQzXht-CqrXa2ufvdc_ASqzJcOmm-SEKZOmb8d3AqgYxHAsRqYhhpsc8I3tSUcmRMW9fCq4TBxDeENzxoGSd-tWk9zwsYaitOKzoHD-fezg5bbc12aMyH6Q6HxgyaEEyRH5CRejxTx777OjV20PutNc1uVx2a7mQ1HhtFQAPm_QdFNMAkwCNKz6jpO2v7ptXHfruv-m-NkZ506UmGnmToUZdm45HTHxOEfJk</recordid><startdate>20130401</startdate><enddate>20130401</enddate><creator>Hatano, Hirofumi</creator><creator>Nishiyama, Shogo</creator><creator>Kurita, Mikio</creator><creator>Kanai, Saori</creator><creator>Nakajima, Yasushi</creator><creator>Nagata, Tetsuya</creator><creator>Tamura, Motohide</creator><creator>Kandori, Ryo</creator><creator>Kato, Daisuke</creator><creator>Sato, Yaeko</creator><creator>Yoshikawa, Tatsuhito</creator><creator>Suenaga, Takuya</creator><creator>Sato, Shuji</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20130401</creationdate><title>THE EFFICIENCY AND WAVELENGTH DEPENDENCE OF NEAR-INFRARED INTERSTELLAR POLARIZATION TOWARD THE GALACTIC CENTER</title><author>Hatano, Hirofumi ; Nishiyama, Shogo ; Kurita, Mikio ; Kanai, Saori ; Nakajima, Yasushi ; Nagata, Tetsuya ; Tamura, Motohide ; Kandori, Ryo ; Kato, Daisuke ; Sato, Yaeko ; Yoshikawa, Tatsuhito ; Suenaga, Takuya ; Sato, Shuji</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c388t-a80c62904d2c42f17421bd3350ccfdd86a8c127c25e59f4527abf666940fa53a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>COLOR</topic><topic>DISPERSIONS</topic><topic>DUSTS</topic><topic>EFFICIENCY</topic><topic>Flattening</topic><topic>FREQUENCY DEPENDENCE</topic><topic>GALAXIES</topic><topic>GALAXY NUCLEI</topic><topic>Interstellar</topic><topic>Interstellar matter</topic><topic>Line of sight</topic><topic>MAGNETIC FIELD CONFIGURATIONS</topic><topic>MAGNETIC FIELDS</topic><topic>POLARIZATION</topic><topic>RANDOMNESS</topic><topic>STARS</topic><topic>WAVELENGTHS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hatano, Hirofumi</creatorcontrib><creatorcontrib>Nishiyama, Shogo</creatorcontrib><creatorcontrib>Kurita, Mikio</creatorcontrib><creatorcontrib>Kanai, Saori</creatorcontrib><creatorcontrib>Nakajima, Yasushi</creatorcontrib><creatorcontrib>Nagata, Tetsuya</creatorcontrib><creatorcontrib>Tamura, Motohide</creatorcontrib><creatorcontrib>Kandori, Ryo</creatorcontrib><creatorcontrib>Kato, Daisuke</creatorcontrib><creatorcontrib>Sato, Yaeko</creatorcontrib><creatorcontrib>Yoshikawa, Tatsuhito</creatorcontrib><creatorcontrib>Suenaga, Takuya</creatorcontrib><creatorcontrib>Sato, Shuji</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hatano, Hirofumi</au><au>Nishiyama, Shogo</au><au>Kurita, Mikio</au><au>Kanai, Saori</au><au>Nakajima, Yasushi</au><au>Nagata, Tetsuya</au><au>Tamura, Motohide</au><au>Kandori, Ryo</au><au>Kato, Daisuke</au><au>Sato, Yaeko</au><au>Yoshikawa, Tatsuhito</au><au>Suenaga, Takuya</au><au>Sato, Shuji</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>THE EFFICIENCY AND WAVELENGTH DEPENDENCE OF NEAR-INFRARED INTERSTELLAR POLARIZATION TOWARD THE GALACTIC CENTER</atitle><jtitle>The Astronomical journal</jtitle><date>2013-04-01</date><risdate>2013</risdate><volume>145</volume><issue>4</issue><spage>1</spage><epage>13</epage><pages>1-13</pages><issn>0004-6256</issn><issn>1538-3881</issn><eissn>1538-3881</eissn><abstract>Near-infrared polarimetric imaging observations toward the Galactic center (GC) have been carried out to examine the efficiency and wavelength dependence of interstellar polarization. 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| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COLOR DISPERSIONS DUSTS EFFICIENCY Flattening FREQUENCY DEPENDENCE GALAXIES GALAXY NUCLEI Interstellar Interstellar matter Line of sight MAGNETIC FIELD CONFIGURATIONS MAGNETIC FIELDS POLARIZATION RANDOMNESS STARS WAVELENGTHS |
| title | THE EFFICIENCY AND WAVELENGTH DEPENDENCE OF NEAR-INFRARED INTERSTELLAR POLARIZATION TOWARD THE GALACTIC CENTER |
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