Redshift evolution of the Lyman-line-absorbing clouds in quasar spectra
The spectral resolution of the results of the present analysis of absorption lines from an echelle spectrum of the z = 3.12 quasar Q0420-388 is sufficiently high to resolve most of the Lyman absorption lines, allowing velocity dispersions and column densities to be obtained by profile fitting. By co...
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| Veröffentlicht in: | Astrophys. J.; (United States) 1985-05, Vol.292 (1), p.58-71 |
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| container_title | Astrophys. J.; (United States) |
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| creator | ATWOOD, B BALDWIN, J. A CARSWELL, R. F |
| description | The spectral resolution of the results of the present analysis of absorption lines from an echelle spectrum of the z = 3.12 quasar Q0420-388 is sufficiently high to resolve most of the Lyman absorption lines, allowing velocity dispersions and column densities to be obtained by profile fitting. By comparing the properties of the Lyman absorption systems at redshifts of about 2 with those at about 3, it is noted that there is no evidence for redshift evolution in the distribution function of any measured quantity. Simple models in which a hot intergalactic medium pressure confined a comoving population of clouds are consistent with the available data, if the clouds are nearly in thermal and ionization balance with the ionizing background flux from quasars. |
| doi_str_mv | 10.1086/163132 |
| format | Article |
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F</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c272t-6a231e2f2f58fd4a6ea367b0576faeeecd972514aeab49d9949ec39c02f201c93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1985</creationdate><topic>640103 - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987)</topic><topic>ABSORPTION SPECTRA</topic><topic>ADIABATIC PROCESSES</topic><topic>Astronomy</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COSMIC GASES</topic><topic>COSMIC RADIO SOURCES</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>FLUIDS</topic><topic>GASES</topic><topic>INTERGALACTIC SPACE</topic><topic>LYMAN LINES</topic><topic>QUASARS</topic><topic>Quasars. Active or peculiar galaxies, objects, and systems</topic><topic>RED SHIFT</topic><topic>SPACE</topic><topic>SPECTRA</topic><topic>Stellar systems. Galactic and extragalactic objects and systems. The universe</topic><topic>VELOCITY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ATWOOD, B</creatorcontrib><creatorcontrib>BALDWIN, J. A</creatorcontrib><creatorcontrib>CARSWELL, R. F</creatorcontrib><creatorcontrib>Cambridge Univ., England</creatorcontrib><creatorcontrib>Observatorio Interamericano de Cerro Tololo, La Serena, Chile</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>ATWOOD, B</au><au>BALDWIN, J. A</au><au>CARSWELL, R. F</au><aucorp>Cambridge Univ., England</aucorp><aucorp>Observatorio Interamericano de Cerro Tololo, La Serena, Chile</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Redshift evolution of the Lyman-line-absorbing clouds in quasar spectra</atitle><jtitle>Astrophys. J.; (United States)</jtitle><date>1985-05-01</date><risdate>1985</risdate><volume>292</volume><issue>1</issue><spage>58</spage><epage>71</epage><pages>58-71</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>The spectral resolution of the results of the present analysis of absorption lines from an echelle spectrum of the z = 3.12 quasar Q0420-388 is sufficiently high to resolve most of the Lyman absorption lines, allowing velocity dispersions and column densities to be obtained by profile fitting. By comparing the properties of the Lyman absorption systems at redshifts of about 2 with those at about 3, it is noted that there is no evidence for redshift evolution in the distribution function of any measured quantity. Simple models in which a hot intergalactic medium pressure confined a comoving population of clouds are consistent with the available data, if the clouds are nearly in thermal and ionization balance with the ionizing background flux from quasars.</abstract><cop>Chicago, IL</cop><pub>University of Chicago Press</pub><doi>10.1086/163132</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Astrophys. J.; (United States), 1985-05, Vol.292 (1), p.58-71 |
| issn | 0004-637X 1538-4357 |
| language | eng |
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| source | Alma/SFX Local Collection |
| subjects | 640103 - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987) ABSORPTION SPECTRA ADIABATIC PROCESSES Astronomy CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC GASES COSMIC RADIO SOURCES Earth, ocean, space Exact sciences and technology FLUIDS GASES INTERGALACTIC SPACE LYMAN LINES QUASARS Quasars. Active or peculiar galaxies, objects, and systems RED SHIFT SPACE SPECTRA Stellar systems. Galactic and extragalactic objects and systems. The universe VELOCITY |
| title | Redshift evolution of the Lyman-line-absorbing clouds in quasar spectra |
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