The 2dF Galaxy Redshift Survey: galaxy luminosity functions per spectral type
Identifieur interne : 000396 ( Main/Exploration ); précédent : 000395; suivant : 000397The 2dF Galaxy Redshift Survey: galaxy luminosity functions per spectral type
Auteurs : Darren S. Madgwick [Royaume-Uni] ; Ofer Lahav ; Ivan K. Baldry [États-Unis] ; Carlton M. Baugh ; Joss Bland-Hawthorn [Australie] ; Terry Bridges [Australie] ; Russell Cannon [Australie] ; Shaun Cole ; Matthew Colless [Australie] ; Chris Collins ; Warrick Couch [Australie] ; Gavin Dalton ; Roberto De Propris [Australie] ; Simon P. Driver ; George Efstathiou ; Richard S. Ellis [États-Unis] ; Carlos S. Frenk ; Karl Glazebrook [États-Unis] ; Carole Jackson [Australie] ; Ian Lewis [Australie] ; Stuart Lumsden ; Steve Maddox ; Peder Norberg ; John A. Peacock ; Bruce A. Peterson [Australie] ; Will Sutherland ; Keith Taylor [États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2002-06-11.
Abstract
We calculate the optical bJ luminosity function (LF) of the 2dF Galaxy Redshift Survey (2dFGRS) for different subsets defined by their spectral properties. These spectrally selected subsets are defined using a new parameter, η, which is a linear combination of the first two projections derived from a Principal Component Analysis. This parameter η identifies the average emission- and absorption-line strength in the galaxy rest frame spectrum, and hence is a useful indicator of the present star formation. We use a total of 75 000 galaxies in our calculations, chosen from a sample of high signal-to-noise ratio, low-redshift galaxies observed before 2001 January. We find that there is a systematic steepening of the faint-end slope (α) as one moves from passive (α=-0.54) to active (α=-1.50) star-forming galaxies, and that there is also a corresponding faintening of the rest frame characteristic magnitude M*-5 log10(h) (from −19.6 to −19.2). We also show that the Schechter function provides a poor fit to the quiescent (Type 1) LF for very faint galaxies [M-5 log10(h) fainter than −16.0], perhaps suggesting the presence of a significant dwarf population. The LFs presented here give a precise confirmation of the trends seen previously in a much smaller preliminary 2dFGRS sample, and in other surveys. We also present a new procedure for determining self-consistent k-corrections, and investigate possible fibre-aperture biases.
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DOI: 10.1046/j.1365-8711.2002.05393.x
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Frenk</name><affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Glazebrook, Karl" sort="Glazebrook, Karl" uniqKey="Glazebrook K" first="Karl" last="Glazebrook">Karl Glazebrook</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686</wicri:regionArea><wicri:noRegion>MD 21218-2686</wicri:noRegion></affiliation></author><author><name sortKey="Jackson, Carole" sort="Jackson, Carole" uniqKey="Jackson C" first="Carole" last="Jackson">Carole Jackson</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea><wicri:noRegion>ACT 2611</wicri:noRegion></affiliation></author><author><name sortKey="Lewis, Ian" sort="Lewis, Ian" uniqKey="Lewis I" first="Ian" last="Lewis">Ian Lewis</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121</wicri:regionArea><wicri:noRegion>NSW 2121</wicri:noRegion></affiliation></author><author><name sortKey="Lumsden, Stuart" sort="Lumsden, Stuart" uniqKey="Lumsden S" first="Stuart" last="Lumsden">Stuart Lumsden</name><affiliation><wicri:noCountry code="subField">9JT</wicri:noCountry></affiliation></author><author><name sortKey="Maddox, Steve" sort="Maddox, Steve" uniqKey="Maddox S" first="Steve" last="Maddox">Steve Maddox</name><affiliation><wicri:noCountry code="subField">2RD</wicri:noCountry></affiliation></author><author><name sortKey="Norberg, Peder" sort="Norberg, Peder" uniqKey="Norberg P" first="Peder" last="Norberg">Peder Norberg</name><affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Peacock, John A" sort="Peacock, John A" uniqKey="Peacock J" first="John A." last="Peacock">John A. 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Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2002-06-11">2002-06-11</date><biblScope unit="volume">333</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="133">133</biblScope><biblScope unit="page" to="144">144</biblScope></imprint><idno type="ISSN">0035-8711</idno></series><idno type="istex">AD9245E48509081819ECFDEA91D6BF454DFAD9BD</idno><idno type="DOI">10.1046/j.1365-8711.2002.05393.x</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">We calculate the optical bJ luminosity function (LF) of the 2dF Galaxy Redshift Survey (2dFGRS) for different subsets defined by their spectral properties. These spectrally selected subsets are defined using a new parameter, η, which is a linear combination of the first two projections derived from a Principal Component Analysis. This parameter η identifies the average emission- and absorption-line strength in the galaxy rest frame spectrum, and hence is a useful indicator of the present star formation. We use a total of 75 000 galaxies in our calculations, chosen from a sample of high signal-to-noise ratio, low-redshift galaxies observed before 2001 January. We find that there is a systematic steepening of the faint-end slope (α) as one moves from passive (α=-0.54) to active (α=-1.50) star-forming galaxies, and that there is also a corresponding faintening of the rest frame characteristic magnitude M*-5 log10(h) (from −19.6 to −19.2). We also show that the Schechter function provides a poor fit to the quiescent (Type 1) LF for very faint galaxies [M-5 log10(h) fainter than −16.0], perhaps suggesting the presence of a significant dwarf population. The LFs presented here give a precise confirmation of the trends seen previously in a much smaller preliminary 2dFGRS sample, and in other surveys. We also present a new procedure for determining self-consistent k-corrections, and investigate possible fibre-aperture biases.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Royaume-Uni</li><li>États-Unis</li></country></list><tree><noCountry><name sortKey="Baugh, Carlton M" sort="Baugh, Carlton M" uniqKey="Baugh C" first="Carlton M." last="Baugh">Carlton M. Baugh</name><name sortKey="Cole, Shaun" sort="Cole, Shaun" uniqKey="Cole S" first="Shaun" last="Cole">Shaun Cole</name><name sortKey="Collins, Chris" sort="Collins, Chris" uniqKey="Collins C" first="Chris" last="Collins">Chris Collins</name><name sortKey="Dalton, Gavin" sort="Dalton, Gavin" uniqKey="Dalton G" first="Gavin" last="Dalton">Gavin Dalton</name><name sortKey="Driver, Simon P" sort="Driver, Simon P" uniqKey="Driver S" first="Simon P." last="Driver">Simon P. Driver</name><name sortKey="Efstathiou, George" sort="Efstathiou, George" uniqKey="Efstathiou G" first="George" last="Efstathiou">George Efstathiou</name><name sortKey="Frenk, Carlos S" sort="Frenk, Carlos S" uniqKey="Frenk C" first="Carlos S." last="Frenk">Carlos S. Frenk</name><name sortKey="Lahav, Ofer" sort="Lahav, Ofer" uniqKey="Lahav O" first="Ofer" last="Lahav">Ofer Lahav</name><name sortKey="Lumsden, Stuart" sort="Lumsden, Stuart" uniqKey="Lumsden S" first="Stuart" last="Lumsden">Stuart Lumsden</name><name sortKey="Maddox, Steve" sort="Maddox, Steve" uniqKey="Maddox S" first="Steve" last="Maddox">Steve Maddox</name><name sortKey="Norberg, Peder" sort="Norberg, Peder" uniqKey="Norberg P" first="Peder" last="Norberg">Peder Norberg</name><name sortKey="Peacock, John A" sort="Peacock, John A" uniqKey="Peacock J" first="John A." last="Peacock">John A. Peacock</name><name sortKey="Sutherland, Will" sort="Sutherland, Will" uniqKey="Sutherland W" first="Will" last="Sutherland">Will Sutherland</name></noCountry><country name="Royaume-Uni"><noRegion><name sortKey="Madgwick, Darren S" sort="Madgwick, Darren S" uniqKey="Madgwick D" first="Darren S." last="Madgwick">Darren S. Madgwick</name></noRegion></country><country name="États-Unis"><noRegion><name sortKey="Baldry, Ivan K" sort="Baldry, Ivan K" uniqKey="Baldry I" first="Ivan K." last="Baldry">Ivan K. Baldry</name></noRegion><name sortKey="Ellis, Richard S" sort="Ellis, Richard S" uniqKey="Ellis R" first="Richard S." last="Ellis">Richard S. Ellis</name><name sortKey="Glazebrook, Karl" sort="Glazebrook, Karl" uniqKey="Glazebrook K" first="Karl" last="Glazebrook">Karl Glazebrook</name><name sortKey="Taylor, Keith" sort="Taylor, Keith" uniqKey="Taylor K" first="Keith" last="Taylor">Keith Taylor</name></country><country name="Australie"><noRegion><name sortKey="Bland Hawthorn, Joss" sort="Bland Hawthorn, Joss" uniqKey="Bland Hawthorn J" first="Joss" last="Bland-Hawthorn">Joss Bland-Hawthorn</name></noRegion><name sortKey="Bridges, Terry" sort="Bridges, Terry" uniqKey="Bridges T" first="Terry" last="Bridges">Terry Bridges</name><name sortKey="Cannon, Russell" sort="Cannon, Russell" uniqKey="Cannon R" first="Russell" last="Cannon">Russell Cannon</name><name sortKey="Colless, Matthew" sort="Colless, Matthew" uniqKey="Colless M" first="Matthew" last="Colless">Matthew Colless</name><name sortKey="Couch, Warrick" sort="Couch, Warrick" uniqKey="Couch W" first="Warrick" last="Couch">Warrick Couch</name><name sortKey="De Propris, Roberto" sort="De Propris, Roberto" uniqKey="De Propris R" first="Roberto" last="De Propris">Roberto De Propris</name><name sortKey="Jackson, Carole" sort="Jackson, Carole" uniqKey="Jackson C" first="Carole" last="Jackson">Carole Jackson</name><name sortKey="Lewis, Ian" sort="Lewis, Ian" uniqKey="Lewis I" first="Ian" last="Lewis">Ian Lewis</name><name sortKey="Peterson, Bruce A" sort="Peterson, Bruce A" uniqKey="Peterson B" first="Bruce A." last="Peterson">Bruce A. 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