CO line emission from shock waves in molecular clouds
Calculations are presented of the emission spectrum of rotationally and vibrationally excited carbon monoxide in shocked interstellar molecular clouds. The rotational and vibrational excitation of CO by electrons, H and He atoms, and H2 molecules is discussed, and accurate analytic fits to the rate...
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| Veröffentlicht in: | Astrophys. J.; (United States) 1984-07, Vol.282 (2), p.491-507 |
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| container_title | Astrophys. J.; (United States) |
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| creator | DRAINE, B. T ROBERGE, W. G |
| description | Calculations are presented of the emission spectrum of rotationally and vibrationally excited carbon monoxide in shocked interstellar molecular clouds. The rotational and vibrational excitation of CO by electrons, H and He atoms, and H2 molecules is discussed, and accurate analytic fits to the rate coefficients of McKee et al. (1982) are presented. The transfer of CO line radiation is treated and a Sobolev-like approximation for radiative transfer in shock waves is developed with allowance for the possibility of population inversions and maser emission. The computation of gas dynamics and level populations is briefly discussed, and graphs are presented of the surface brightness of MHD shocks in various CO lines as functions of shock speed and preshock conditions. The observability of CO maser emission in shocks is considered, and some practical applications of the calculations are pointed out. |
| doi_str_mv | 10.1086/162227 |
| format | Article |
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T ; ROBERGE, W. G</creator><creatorcontrib>DRAINE, B. T ; ROBERGE, W. G ; Princeton University Observatory</creatorcontrib><description>Calculations are presented of the emission spectrum of rotationally and vibrationally excited carbon monoxide in shocked interstellar molecular clouds. The rotational and vibrational excitation of CO by electrons, H and He atoms, and H2 molecules is discussed, and accurate analytic fits to the rate coefficients of McKee et al. (1982) are presented. The transfer of CO line radiation is treated and a Sobolev-like approximation for radiative transfer in shock waves is developed with allowance for the possibility of population inversions and maser emission. The computation of gas dynamics and level populations is briefly discussed, and graphs are presented of the surface brightness of MHD shocks in various CO lines as functions of shock speed and preshock conditions. The observability of CO maser emission in shocks is considered, and some practical applications of the calculations are pointed out.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.1086/162227</identifier><identifier>CODEN: ASJOAB</identifier><language>eng</language><publisher>Chicago, IL: University of Chicago Press</publisher><subject>640105 - Astrophysics & Cosmology- Galaxies ; AMPLIFIERS ; Astronomy ; CARBON COMPOUNDS ; CARBON MONOXIDE ; CARBON OXIDES ; CHALCOGENIDES ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COLLISIONS ; Earth, ocean, space ; ELECTRONIC EQUIPMENT ; EMISSION SPECTRA ; ENERGY LEVELS ; ENERGY-LEVEL DENSITY ; ENERGY-LEVEL TRANSITIONS ; Exact sciences and technology ; EXCITED STATES ; FLUID MECHANICS ; HYDRODYNAMICS ; INTERSTELLAR GRAINS ; Interstellar medium (ism) and nebulae in milky way ; IONIZATION ; MAGNETIC FIELDS ; MAGNETOHYDRODYNAMICS ; MASERS ; MECHANICS ; MICROWAVE AMPLIFIERS ; MICROWAVE EQUIPMENT ; Molecular clouds, h2 clouds, dense clouds, and dark clouds ; MOLECULE COLLISIONS ; MOLECULE-MOLECULE COLLISIONS ; OXIDES ; OXYGEN COMPOUNDS ; PARTICLES ; QUANTUM MECHANICS ; RADIATION TRANSPORT ; ROTATIONAL STATES ; SHOCK WAVES ; SPECTRA ; Stellar systems. Galactic and extragalactic objects and systems. The universe ; VIBRATIONAL STATES</subject><ispartof>Astrophys. J.; (United States), 1984-07, Vol.282 (2), p.491-507</ispartof><rights>1985 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c272t-a030e1f76cc7cd241a3e5c957eab3f6bcd346c09a149fdb13810736d9808396e3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=8896885$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/6301890$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>DRAINE, B. T</creatorcontrib><creatorcontrib>ROBERGE, W. G</creatorcontrib><creatorcontrib>Princeton University Observatory</creatorcontrib><title>CO line emission from shock waves in molecular clouds</title><title>Astrophys. J.; (United States)</title><description>Calculations are presented of the emission spectrum of rotationally and vibrationally excited carbon monoxide in shocked interstellar molecular clouds. The rotational and vibrational excitation of CO by electrons, H and He atoms, and H2 molecules is discussed, and accurate analytic fits to the rate coefficients of McKee et al. (1982) are presented. The transfer of CO line radiation is treated and a Sobolev-like approximation for radiative transfer in shock waves is developed with allowance for the possibility of population inversions and maser emission. The computation of gas dynamics and level populations is briefly discussed, and graphs are presented of the surface brightness of MHD shocks in various CO lines as functions of shock speed and preshock conditions. The observability of CO maser emission in shocks is considered, and some practical applications of the calculations are pointed out.</description><subject>640105 - Astrophysics & Cosmology- Galaxies</subject><subject>AMPLIFIERS</subject><subject>Astronomy</subject><subject>CARBON COMPOUNDS</subject><subject>CARBON MONOXIDE</subject><subject>CARBON OXIDES</subject><subject>CHALCOGENIDES</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COLLISIONS</subject><subject>Earth, ocean, space</subject><subject>ELECTRONIC EQUIPMENT</subject><subject>EMISSION SPECTRA</subject><subject>ENERGY LEVELS</subject><subject>ENERGY-LEVEL DENSITY</subject><subject>ENERGY-LEVEL TRANSITIONS</subject><subject>Exact sciences and technology</subject><subject>EXCITED STATES</subject><subject>FLUID MECHANICS</subject><subject>HYDRODYNAMICS</subject><subject>INTERSTELLAR GRAINS</subject><subject>Interstellar medium (ism) and nebulae in milky way</subject><subject>IONIZATION</subject><subject>MAGNETIC FIELDS</subject><subject>MAGNETOHYDRODYNAMICS</subject><subject>MASERS</subject><subject>MECHANICS</subject><subject>MICROWAVE AMPLIFIERS</subject><subject>MICROWAVE EQUIPMENT</subject><subject>Molecular clouds, h2 clouds, dense clouds, and dark clouds</subject><subject>MOLECULE COLLISIONS</subject><subject>MOLECULE-MOLECULE COLLISIONS</subject><subject>OXIDES</subject><subject>OXYGEN COMPOUNDS</subject><subject>PARTICLES</subject><subject>QUANTUM MECHANICS</subject><subject>RADIATION TRANSPORT</subject><subject>ROTATIONAL STATES</subject><subject>SHOCK WAVES</subject><subject>SPECTRA</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. The universe</subject><subject>VIBRATIONAL STATES</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1984</creationdate><recordtype>article</recordtype><recordid>eNpN0NtKxDAQBuAgCq6nZwgi3lWTps3hUhZPsLA3Ct6F7DRlo2mzZlrFt7fLLuLVMPDxD_MTcsHZDWda3nJZlqU6IDNeC11UolaHZMYYqwop1NsxOUF8366lMTNSz5c0ht5T3wXEkHra5tRRXCf4oN_uyyMNPe1S9DBGlynENDZ4Ro5aF9Gf7-cpeX24f5k_FYvl4_P8blFAqcqhcEwwz1slARQ0ZcWd8DWYWnm3Eq1cQSMqCcw4Xpm2WXGhOVNCNkYzLYz04pRc7nITDsEihMHDGlLfexisFIxrwyZ0vUObnD5Hj4OdXgEfo-t9GtFOdyuu2T8IOSFm39pNDp3LP5Yzu63O7qqb4NU-0SG42GbXQ8A_rbWRWtfiF1QIat4</recordid><startdate>19840715</startdate><enddate>19840715</enddate><creator>DRAINE, B. T</creator><creator>ROBERGE, W. G</creator><general>University of Chicago Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>19840715</creationdate><title>CO line emission from shock waves in molecular clouds</title><author>DRAINE, B. T ; ROBERGE, W. G</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c272t-a030e1f76cc7cd241a3e5c957eab3f6bcd346c09a149fdb13810736d9808396e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1984</creationdate><topic>640105 - Astrophysics & Cosmology- Galaxies</topic><topic>AMPLIFIERS</topic><topic>Astronomy</topic><topic>CARBON COMPOUNDS</topic><topic>CARBON MONOXIDE</topic><topic>CARBON OXIDES</topic><topic>CHALCOGENIDES</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COLLISIONS</topic><topic>Earth, ocean, space</topic><topic>ELECTRONIC EQUIPMENT</topic><topic>EMISSION SPECTRA</topic><topic>ENERGY LEVELS</topic><topic>ENERGY-LEVEL DENSITY</topic><topic>ENERGY-LEVEL TRANSITIONS</topic><topic>Exact sciences and technology</topic><topic>EXCITED STATES</topic><topic>FLUID MECHANICS</topic><topic>HYDRODYNAMICS</topic><topic>INTERSTELLAR GRAINS</topic><topic>Interstellar medium (ism) and nebulae in milky way</topic><topic>IONIZATION</topic><topic>MAGNETIC FIELDS</topic><topic>MAGNETOHYDRODYNAMICS</topic><topic>MASERS</topic><topic>MECHANICS</topic><topic>MICROWAVE AMPLIFIERS</topic><topic>MICROWAVE EQUIPMENT</topic><topic>Molecular clouds, h2 clouds, dense clouds, and dark clouds</topic><topic>MOLECULE COLLISIONS</topic><topic>MOLECULE-MOLECULE COLLISIONS</topic><topic>OXIDES</topic><topic>OXYGEN COMPOUNDS</topic><topic>PARTICLES</topic><topic>QUANTUM MECHANICS</topic><topic>RADIATION TRANSPORT</topic><topic>ROTATIONAL STATES</topic><topic>SHOCK WAVES</topic><topic>SPECTRA</topic><topic>Stellar systems. Galactic and extragalactic objects and systems. The universe</topic><topic>VIBRATIONAL STATES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>DRAINE, B. T</creatorcontrib><creatorcontrib>ROBERGE, W. G</creatorcontrib><creatorcontrib>Princeton University Observatory</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Astrophys. J.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>DRAINE, B. T</au><au>ROBERGE, W. G</au><aucorp>Princeton University Observatory</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CO line emission from shock waves in molecular clouds</atitle><jtitle>Astrophys. J.; (United States)</jtitle><date>1984-07-15</date><risdate>1984</risdate><volume>282</volume><issue>2</issue><spage>491</spage><epage>507</epage><pages>491-507</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>Calculations are presented of the emission spectrum of rotationally and vibrationally excited carbon monoxide in shocked interstellar molecular clouds. The rotational and vibrational excitation of CO by electrons, H and He atoms, and H2 molecules is discussed, and accurate analytic fits to the rate coefficients of McKee et al. (1982) are presented. The transfer of CO line radiation is treated and a Sobolev-like approximation for radiative transfer in shock waves is developed with allowance for the possibility of population inversions and maser emission. The computation of gas dynamics and level populations is briefly discussed, and graphs are presented of the surface brightness of MHD shocks in various CO lines as functions of shock speed and preshock conditions. The observability of CO maser emission in shocks is considered, and some practical applications of the calculations are pointed out.</abstract><cop>Chicago, IL</cop><pub>University of Chicago Press</pub><doi>10.1086/162227</doi><tpages>17</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Astrophys. J.; (United States), 1984-07, Vol.282 (2), p.491-507 |
| issn | 0004-637X 1538-4357 |
| language | eng |
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| subjects | 640105 - Astrophysics & Cosmology- Galaxies AMPLIFIERS Astronomy CARBON COMPOUNDS CARBON MONOXIDE CARBON OXIDES CHALCOGENIDES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COLLISIONS Earth, ocean, space ELECTRONIC EQUIPMENT EMISSION SPECTRA ENERGY LEVELS ENERGY-LEVEL DENSITY ENERGY-LEVEL TRANSITIONS Exact sciences and technology EXCITED STATES FLUID MECHANICS HYDRODYNAMICS INTERSTELLAR GRAINS Interstellar medium (ism) and nebulae in milky way IONIZATION MAGNETIC FIELDS MAGNETOHYDRODYNAMICS MASERS MECHANICS MICROWAVE AMPLIFIERS MICROWAVE EQUIPMENT Molecular clouds, h2 clouds, dense clouds, and dark clouds MOLECULE COLLISIONS MOLECULE-MOLECULE COLLISIONS OXIDES OXYGEN COMPOUNDS PARTICLES QUANTUM MECHANICS RADIATION TRANSPORT ROTATIONAL STATES SHOCK WAVES SPECTRA Stellar systems. Galactic and extragalactic objects and systems. The universe VIBRATIONAL STATES |
| title | CO line emission from shock waves in molecular clouds |
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