Extended near-infrared emission from visual reflection nebulae
Extended near infrared (2 to 5 microns) emission was observed from three visual reflection nebulae, NGC 7023, 2023, and 2068. The emission from each nebula consists of a smooth continuum, which can be described by a greybody with a color temperature of 1000 K, and emission features at 3.3 and 3.4 mi...
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| Veröffentlicht in: | The Astrophysical journal 1983-08, Vol.271 (1), p.L13-L17 |
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| container_end_page | L17 |
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| container_title | The Astrophysical journal |
| container_volume | 271 |
| creator | Sellgren, K. Werner, M. W. Dinerstein, H. L. |
| description | Extended near infrared (2 to 5 microns) emission was observed from three visual reflection nebulae, NGC 7023, 2023, and 2068. The emission from each nebula consists of a smooth continuum, which can be described by a greybody with a color temperature of 1000 K, and emission features at 3.3 and 3.4 microns. The continuum emission cannot be explained by free-free emission, reflected light, or field stars, or by thermal emission from grains, with commonly accepted ratios of infrared to ultraviolet emissivities, which are in equilibrium with the stellar radiation field. A possible explanation is thermal emission from grains with extremely low ratios of infrared to ultraviolet emissivities, or from grains with a temperature determined by mechanisms other than equilibrium radiative heating. Another possibility is continuum fluorescence. Previously announced in STAR N83-25629 |
| doi_str_mv | 10.1086/184083 |
| format | Article |
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L.</creatorcontrib><title>Extended near-infrared emission from visual reflection nebulae</title><title>The Astrophysical journal</title><description>Extended near infrared (2 to 5 microns) emission was observed from three visual reflection nebulae, NGC 7023, 2023, and 2068. The emission from each nebula consists of a smooth continuum, which can be described by a greybody with a color temperature of 1000 K, and emission features at 3.3 and 3.4 microns. The continuum emission cannot be explained by free-free emission, reflected light, or field stars, or by thermal emission from grains, with commonly accepted ratios of infrared to ultraviolet emissivities, which are in equilibrium with the stellar radiation field. A possible explanation is thermal emission from grains with extremely low ratios of infrared to ultraviolet emissivities, or from grains with a temperature determined by mechanisms other than equilibrium radiative heating. Another possibility is continuum fluorescence. 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L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Extended near-infrared emission from visual reflection nebulae</atitle><jtitle>The Astrophysical journal</jtitle><date>1983-08-01</date><risdate>1983</risdate><volume>271</volume><issue>1</issue><spage>L13</spage><epage>L17</epage><pages>L13-L17</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>Extended near infrared (2 to 5 microns) emission was observed from three visual reflection nebulae, NGC 7023, 2023, and 2068. The emission from each nebula consists of a smooth continuum, which can be described by a greybody with a color temperature of 1000 K, and emission features at 3.3 and 3.4 microns. The continuum emission cannot be explained by free-free emission, reflected light, or field stars, or by thermal emission from grains, with commonly accepted ratios of infrared to ultraviolet emissivities, which are in equilibrium with the stellar radiation field. 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| fulltext | fulltext |
| identifier | ISSN: 0004-637X |
| ispartof | The Astrophysical journal, 1983-08, Vol.271 (1), p.L13-L17 |
| issn | 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_24115902 |
| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | Astronomy Astrophysics Earth, ocean, space Exact sciences and technology H ii regions. Emission and reflection nebulae Interstellar medium (ism) and nebulae in milky way Stellar systems. Galactic and extragalactic objects and systems. The universe |
| title | Extended near-infrared emission from visual reflection nebulae |
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