Ca ii absorbers in the Sloan Digital Sky Survey: statistics
We present the results of a survey for Ca ii λλ3934, 3969 absorption-line systems culled from ∼95 000 Sloan Digital Sky Survey (SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435 doublets identified in the catalogue, this list is the largest Ca ii catalogue compiled to date, spanning r...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2014-10, Vol.444 (2), p.1747-1758 |
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| creator | Sardane, Gendith M. Turnshek, David A. Rao, Sandhya M. |
| description | We present the results of a survey for Ca ii λλ3934, 3969 absorption-line systems culled from ∼95 000 Sloan Digital Sky Survey (SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435 doublets identified in the catalogue, this list is the largest Ca ii catalogue compiled to date, spanning redshifts z |
| doi_str_mv | 10.1093/mnras/stu1554 |
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| fullrecord | <record><control><sourceid>proquest_TOX</sourceid><recordid>TN_cdi_proquest_miscellaneous_1611626853</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><oup_id>10.1093/mnras/stu1554</oup_id><sourcerecordid>3443666871</sourcerecordid><originalsourceid>FETCH-LOGICAL-o249t-af717777888be69e44244ab8b33c268a3e7adef210fb5b70b37e090275a0bd73</originalsourceid><addsrcrecordid>eNpdkEtLAzEYRYMoWKtL9wE3bsbmnRnBhbS-oOCi3YcvbUZTp5OaZITu3Po3_SWOWhC8m7u5HC4HoVNKLiip-GjdRkijlDsqpdhDA8qVLFil1D4aEMJlUWpKD9FRSitCiOBMDdDVGD7fP7zHYFOI1sWEfYvzs8OzJkCLJ_7JZ2jw7GWLZ118c9tLnDJkn7JfpGN0UEOT3Mmuh2h-ezMf3xfTx7uH8fW0CExUuYBaU92nLEvrVOWEYEKALS3nC6ZK4E7D0tWMktpKq4nl2pGKMC2B2KXmQ3T-i93E8Nq5lM3ap4VrGmhd6JKhilLVgyTvp2f_pqvQxbY_Z6hUvRdZSfoHDN3GbKJfQ9waSsy3RvOj0ew08i_b9WaL</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1565545951</pqid></control><display><type>article</type><title>Ca ii absorbers in the Sloan Digital Sky Survey: statistics</title><source>Oxford Journals Open Access Collection</source><creator>Sardane, Gendith M. ; Turnshek, David A. ; Rao, Sandhya M.</creator><creatorcontrib>Sardane, Gendith M. ; Turnshek, David A. ; Rao, Sandhya M.</creatorcontrib><description>We present the results of a survey for Ca ii λλ3934, 3969 absorption-line systems culled from ∼95 000 Sloan Digital Sky Survey (SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435 doublets identified in the catalogue, this list is the largest Ca ii catalogue compiled to date, spanning redshifts z < 1.34, which corresponds to the most recent ∼8.9 Gyr of the history of the Universe. We derive statistics on the Ca ii rest equivalent width distribution and incidence. We find that the λ3934 rest equivalent width (
$W_{0}^{\lambda 3934}$
) distribution cannot be described by a single exponential function. A double exponential function is required to produce a satisfactory description. The function can be written as a sum of weak and strong components:
${\mathrm{\partial} n}/{\mathrm{\partial} W_{0}^{\lambda 3934}}= ({N_{{\rm wk}}^{\ast }}/{W_{{\rm wk}}^{\ast }}) \exp ({ -{W_{0}^{\lambda 3934}}/{W_{{\rm wk}}^{\ast } } }) + ({N_{{\rm str}}^{\ast }}/{W_{{\rm str}}^{\ast }}) \exp ({ -{W_{0}^{\lambda 3934}}/{W_{{\rm str}}^{\ast } } })$
. A maximum likelihood fit to the unbinned data indicates
$N_{{\rm wk}}^{\ast }=0.140\pm 0.029$
,
$W_{{\rm wk}}^{\ast }=0.165\pm 0.020\ \mathrm{\unicode{197}}$
,
$N_{{\rm str}}^{\ast }=0.024\pm 0.020$
, and
$W_{{\rm str}}^{\ast }=0.427\pm 0.101\ \mathrm{\unicode{197}}$
. This suggests that the Ca ii absorbers are composed of at least two distinct populations. The incidence of the overall Ca ii absorber population does not show evidence for evolution in the standard cosmology. The normalization of the no-evolution curve, i.e. the value of the Ca ii incidence extrapolated to redshift z = 0, for
$W_{0}^{\lambda 3934} \ge 0.3$
Å, is n
0 = 0.017 ± 0.001. In comparison to Mg ii surveys, we found that only 3 per cent of Mg ii systems in the SDSS have Ca ii, confirming that Ca ii systems are rare. We also report on some preliminary investigations of the nature of the two populations of Ca ii absorbers, and show that they can likely be distinguished using their Mg ii properties.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stu1554</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Astronomy ; Cosmology ; Red shift ; Star & galaxy formation ; Statistics ; Universe</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2014-10, Vol.444 (2), p.1747-1758</ispartof><rights>2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2014</rights><rights>Copyright Oxford University Press, UK Oct 21, 2014</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1598,27903,27904</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stu1554$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Sardane, Gendith M.</creatorcontrib><creatorcontrib>Turnshek, David A.</creatorcontrib><creatorcontrib>Rao, Sandhya M.</creatorcontrib><title>Ca ii absorbers in the Sloan Digital Sky Survey: statistics</title><title>Monthly notices of the Royal Astronomical Society</title><addtitle>Mon. Not. R. Astron. Soc</addtitle><description>We present the results of a survey for Ca ii λλ3934, 3969 absorption-line systems culled from ∼95 000 Sloan Digital Sky Survey (SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435 doublets identified in the catalogue, this list is the largest Ca ii catalogue compiled to date, spanning redshifts z < 1.34, which corresponds to the most recent ∼8.9 Gyr of the history of the Universe. We derive statistics on the Ca ii rest equivalent width distribution and incidence. We find that the λ3934 rest equivalent width (
$W_{0}^{\lambda 3934}$
) distribution cannot be described by a single exponential function. A double exponential function is required to produce a satisfactory description. The function can be written as a sum of weak and strong components:
${\mathrm{\partial} n}/{\mathrm{\partial} W_{0}^{\lambda 3934}}= ({N_{{\rm wk}}^{\ast }}/{W_{{\rm wk}}^{\ast }}) \exp ({ -{W_{0}^{\lambda 3934}}/{W_{{\rm wk}}^{\ast } } }) + ({N_{{\rm str}}^{\ast }}/{W_{{\rm str}}^{\ast }}) \exp ({ -{W_{0}^{\lambda 3934}}/{W_{{\rm str}}^{\ast } } })$
. A maximum likelihood fit to the unbinned data indicates
$N_{{\rm wk}}^{\ast }=0.140\pm 0.029$
,
$W_{{\rm wk}}^{\ast }=0.165\pm 0.020\ \mathrm{\unicode{197}}$
,
$N_{{\rm str}}^{\ast }=0.024\pm 0.020$
, and
$W_{{\rm str}}^{\ast }=0.427\pm 0.101\ \mathrm{\unicode{197}}$
. This suggests that the Ca ii absorbers are composed of at least two distinct populations. The incidence of the overall Ca ii absorber population does not show evidence for evolution in the standard cosmology. The normalization of the no-evolution curve, i.e. the value of the Ca ii incidence extrapolated to redshift z = 0, for
$W_{0}^{\lambda 3934} \ge 0.3$
Å, is n
0 = 0.017 ± 0.001. In comparison to Mg ii surveys, we found that only 3 per cent of Mg ii systems in the SDSS have Ca ii, confirming that Ca ii systems are rare. We also report on some preliminary investigations of the nature of the two populations of Ca ii absorbers, and show that they can likely be distinguished using their Mg ii properties.</description><subject>Astronomy</subject><subject>Cosmology</subject><subject>Red shift</subject><subject>Star & galaxy formation</subject><subject>Statistics</subject><subject>Universe</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNpdkEtLAzEYRYMoWKtL9wE3bsbmnRnBhbS-oOCi3YcvbUZTp5OaZITu3Po3_SWOWhC8m7u5HC4HoVNKLiip-GjdRkijlDsqpdhDA8qVLFil1D4aEMJlUWpKD9FRSitCiOBMDdDVGD7fP7zHYFOI1sWEfYvzs8OzJkCLJ_7JZ2jw7GWLZ118c9tLnDJkn7JfpGN0UEOT3Mmuh2h-ezMf3xfTx7uH8fW0CExUuYBaU92nLEvrVOWEYEKALS3nC6ZK4E7D0tWMktpKq4nl2pGKMC2B2KXmQ3T-i93E8Nq5lM3ap4VrGmhd6JKhilLVgyTvp2f_pqvQxbY_Z6hUvRdZSfoHDN3GbKJfQ9waSsy3RvOj0ew08i_b9WaL</recordid><startdate>20141021</startdate><enddate>20141021</enddate><creator>Sardane, Gendith M.</creator><creator>Turnshek, David A.</creator><creator>Rao, Sandhya M.</creator><general>Oxford University Press</general><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20141021</creationdate><title>Ca ii absorbers in the Sloan Digital Sky Survey: statistics</title><author>Sardane, Gendith M. ; Turnshek, David A. ; Rao, Sandhya M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-o249t-af717777888be69e44244ab8b33c268a3e7adef210fb5b70b37e090275a0bd73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Astronomy</topic><topic>Cosmology</topic><topic>Red shift</topic><topic>Star & galaxy formation</topic><topic>Statistics</topic><topic>Universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sardane, Gendith M.</creatorcontrib><creatorcontrib>Turnshek, David A.</creatorcontrib><creatorcontrib>Rao, Sandhya M.</creatorcontrib><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Sardane, Gendith M.</au><au>Turnshek, David A.</au><au>Rao, Sandhya M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ca ii absorbers in the Sloan Digital Sky Survey: statistics</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Mon. Not. R. Astron. Soc</stitle><date>2014-10-21</date><risdate>2014</risdate><volume>444</volume><issue>2</issue><spage>1747</spage><epage>1758</epage><pages>1747-1758</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>We present the results of a survey for Ca ii λλ3934, 3969 absorption-line systems culled from ∼95 000 Sloan Digital Sky Survey (SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435 doublets identified in the catalogue, this list is the largest Ca ii catalogue compiled to date, spanning redshifts z < 1.34, which corresponds to the most recent ∼8.9 Gyr of the history of the Universe. We derive statistics on the Ca ii rest equivalent width distribution and incidence. We find that the λ3934 rest equivalent width (
$W_{0}^{\lambda 3934}$
) distribution cannot be described by a single exponential function. A double exponential function is required to produce a satisfactory description. The function can be written as a sum of weak and strong components:
${\mathrm{\partial} n}/{\mathrm{\partial} W_{0}^{\lambda 3934}}= ({N_{{\rm wk}}^{\ast }}/{W_{{\rm wk}}^{\ast }}) \exp ({ -{W_{0}^{\lambda 3934}}/{W_{{\rm wk}}^{\ast } } }) + ({N_{{\rm str}}^{\ast }}/{W_{{\rm str}}^{\ast }}) \exp ({ -{W_{0}^{\lambda 3934}}/{W_{{\rm str}}^{\ast } } })$
. A maximum likelihood fit to the unbinned data indicates
$N_{{\rm wk}}^{\ast }=0.140\pm 0.029$
,
$W_{{\rm wk}}^{\ast }=0.165\pm 0.020\ \mathrm{\unicode{197}}$
,
$N_{{\rm str}}^{\ast }=0.024\pm 0.020$
, and
$W_{{\rm str}}^{\ast }=0.427\pm 0.101\ \mathrm{\unicode{197}}$
. This suggests that the Ca ii absorbers are composed of at least two distinct populations. The incidence of the overall Ca ii absorber population does not show evidence for evolution in the standard cosmology. The normalization of the no-evolution curve, i.e. the value of the Ca ii incidence extrapolated to redshift z = 0, for
$W_{0}^{\lambda 3934} \ge 0.3$
Å, is n
0 = 0.017 ± 0.001. In comparison to Mg ii surveys, we found that only 3 per cent of Mg ii systems in the SDSS have Ca ii, confirming that Ca ii systems are rare. We also report on some preliminary investigations of the nature of the two populations of Ca ii absorbers, and show that they can likely be distinguished using their Mg ii properties.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stu1554</doi><tpages>12</tpages></addata></record> |
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| title | Ca ii absorbers in the Sloan Digital Sky Survey: statistics |
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