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McGraw, S. M.; Brandt, W. N.; Grier, C. J.; Ak, N. Filiz; Hall, P. B.; Schneider, D. P.; Anderson, S. F.; Green, P. J.; Hutchinson, T. A.; Macleod, C. L.; Vivek, M.
<?xml version='1.0' encoding='UTF-8'?> <record xmlns="http://www.loc.gov/MARC21/slim"> <leader>00000nam##2200000uu#4500</leader> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Brandt, W. N.</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Grier, C. J.</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Ak, N. Filiz</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Hall, P. B.</subfield> <subfield code="u">York Univ, Dept Phys & Astron, 4700 Keele St, Toronto, ON M3J 1P3, Canada</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Schneider, D. P.</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Anderson, S. F.</subfield> <subfield code="u">Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Green, P. J.</subfield> <subfield code="u">Harvard Smithsonian Ctr Astrophys, 60 Garden Sreet, Cambridge, MA 02138 USA</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Hutchinson, T. A.</subfield> <subfield code="u">Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Macleod, C. L.</subfield> <subfield code="u">Harvard Smithsonian Ctr Astrophys, 60 Garden Sreet, Cambridge, MA 02138 USA</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Vivek, M.</subfield> <subfield code="u">Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA</subfield> </datafield> <datafield tag="909" ind1="C" ind2="4"> <subfield code="p">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</subfield> <subfield code="v">469</subfield> <subfield code="n">3</subfield> <subfield code="c">3163-3184</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">user-tubitak-destekli-proje-yayinlari</subfield> </datafield> <datafield tag="540" ind1=" " ind2=" "> <subfield code="a">Creative Commons Attribution</subfield> <subfield code="u">http://www.opendefinition.org/licenses/cc-by</subfield> </datafield> <datafield tag="024" ind1=" " ind2=" "> <subfield code="a">10.1093/mnras/stx1063</subfield> <subfield code="2">doi</subfield> </datafield> <datafield tag="245" ind1=" " ind2=" "> <subfield code="a">Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey</subfield> </datafield> <datafield tag="100" ind1=" " ind2=" "> <subfield code="a">McGraw, S. M.</subfield> </datafield> <datafield tag="909" ind1="C" ind2="O"> <subfield code="o">oai:zenodo.org:45141</subfield> <subfield code="p">user-tubitak-destekli-proje-yayinlari</subfield> </datafield> <datafield tag="650" ind1="1" ind2="7"> <subfield code="2">opendefinition.org</subfield> <subfield code="a">cc-by</subfield> </datafield> <datafield tag="260" ind1=" " ind2=" "> <subfield code="c">2017-01-01</subfield> </datafield> <datafield tag="856" ind1="4" ind2=" "> <subfield code="u">https://aperta.ulakbim.gov.trrecord/45141/files/bib-1f3f0a8b-97b9-4b40-a180-0d7a1a013bbf.txt</subfield> <subfield code="z">md5:2de030d82b096b449033e871d7bb5f1f</subfield> <subfield code="s">329</subfield> </datafield> <datafield tag="542" ind1=" " ind2=" "> <subfield code="l">open</subfield> </datafield> <controlfield tag="005">20210315213107.0</controlfield> <controlfield tag="001">45141</controlfield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">publication</subfield> <subfield code="b">article</subfield> </datafield> <datafield tag="520" ind1=" " ind2=" "> <subfield code="a">We investigate broad absorption line (BAL) disappearance and emergence using a 470 BAL-quasar sample over &lt;= 0.10-5.25 rest-frame years with at least three spectroscopic epochs for each quasar from the Sloan Digital Sky Survey. We identify 14 disappearing BALs over &lt;= 1.73-4.62 rest-frame years and 18 emerging BALs over &lt;= 1.46-3.66 rest-frame years associated with the C IV lambda 1548,1550 and/or Si IV lambda lambda 1393,1402 doublets, and report on their variability behaviour. BAL quasars in our data set exhibit disappearing/emerging C IV BALs at a rate of 2.3(-0.7)(+0.9) and 3.0(-0.8)(+1.0) per cent, respectively, and the frequency for BAL to non-BAL quasar transitions is 1.7(-0.6)(+0.8) per cent. We detect four re-emerging BALs over &lt;= 3.88 rest-frame years on average and three re-disappearing BALs over &lt;= 4.15 rest-frame years on average, the first reported cases of these types. We infer BAL lifetimes along the line of sight to be nominally less than or similar to 100-1000 yr using disappearing C IV BALs in our sample. Interpretations of (re-) emerging and (re-) disappearing BALs reveal evidence that collectively supports both transverse-motion and ionization-change scenarios to explain BAL variations. We constrain a nominal C IV/Si IV BAL-outflow location of less than or similar to 100 pc from the central source and a radial size of greater than or similar to 1x 10(-7) pc (0.02 au) using the ionization-change scenario, and constrain a nominal outflow location of less than or similar to 0.5 pc and a transverse size of similar to 0.01 pc using the transverse-motion scenario. Our findings are consistent with previous work, and provide evidence in support of BALs tracing compact flow geometries with small filling factors.</subfield> </datafield> </record>
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