The morphology, kinematics and metallicity of blue-core galaxies
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摘要
We select 107 blue-core galaxies from the MaNGA survey, studying their morphology, kinematics as well as the gas-phase metallicity. Our results are as follows:(i) In our sample, 26% of blue-core galaxies have decoupled gas-star kinematics, indicating external gas accretion; 15% have bar-like structure and 8% show post-merger features, such as tidal tails and irregular gas/star velocity field. All these processes/features, such as accreting external misaligned gas, interaction and bar, can trigger gas inflow. Thus the central star-forming activities lead to bluer colors in their centers(blue-core galaxies).(ii) By comparing with the SDSS DR7 star-forming galaxy sample, we find that the blue-core galaxies have higher central gas-phase metallicity than what is predicted by the local mass-metallicity relation. We explore the origin of the higher metallicity, finding that not only the blue-core galaxies, but also the flat-gradient and red-core galaxies all have higher metallicity. This can be explained by the combined effect of redshift and galaxy color.
We select 107 blue-core galaxies from the MaNGA survey, studying their morphology, kinematics as well as the gas-phase metallicity. Our results are as follows:(i) In our sample, 26% of blue-core galaxies have decoupled gas-star kinematics, indicating external gas accretion; 15% have bar-like structure and 8% show post-merger features, such as tidal tails and irregular gas/star velocity field. All these processes/features, such as accreting external misaligned gas, interaction and bar, can trigger gas inflow. Thus the central star-forming activities lead to bluer colors in their centers(blue-core galaxies).(ii) By comparing with the SDSS DR7 star-forming galaxy sample, we find that the blue-core galaxies have higher central gas-phase metallicity than what is predicted by the local mass-metallicity relation. We explore the origin of the higher metallicity, finding that not only the blue-core galaxies, but also the flat-gradient and red-core galaxies all have higher metallicity. This can be explained by the combined effect of redshift and galaxy color.
We select 107 blue-core galaxies from the MaNGA survey, studying their morphology, kinematics as well as the gas-phase metallicity. Our results are as follows:(i) In our sample, 26% of blue-core galaxies have decoupled gas-star kinematics, indicating external gas accretion; 15% have bar-like structure and 8% show post-merger features, such as tidal tails and irregular gas/star velocity field. All these processes/features, such as accreting external misaligned gas, interaction and bar, can trigger gas inflow. Thus the central star-forming activities lead to bluer colors in their centers(blue-core galaxies).(ii) By comparing with the SDSS DR7 star-forming galaxy sample, we find that the blue-core galaxies have higher central gas-phase metallicity than what is predicted by the local mass-metallicity relation. We explore the origin of the higher metallicity, finding that not only the blue-core galaxies, but also the flat-gradient and red-core galaxies all have higher metallicity. This can be explained by the combined effect of redshift and galaxy color.
引文
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Baldwin,J.A.,Phillips,M.M.,&Terlevich,R.1981,PASP,93,5
Barnes,J.E.,&Hernquist,L.1996,ApJ,471,115
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Gallart,C.,Stetson,P.B.,Meschin,I.P.,Pont,F.,&Hardy,E.2008,ApJ,682,L89
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Perez,E.,Cid Fernandes,R.,Gonz′alez Delgado,R.M.,et al.2013,ApJ,764,L1
Regan,M.W.,&Teuben,P.J.2004,ApJ,600,595
Smee,S.A.,Gunn,J.E.,Uomoto,A.,et al.2013,AJ,146,32
Strauss,M.A.,Weinberg,D.H.,Lupton,R.H.,et al.2002,AJ,124,1810
Tremonti,C.A.,Heckman,T.M.,Kauffmann,G.,et al.2004,ApJ,613,898
Trouille,L.,Barger,A.J.,&Tremonti,C.2011,ApJ,742,46
Wake,D.A.,Bundy,K.,Diamond-Stanic,A.M.,et al.2017,AJ,154,86
Wang,J.,Kauffmann,G.,Overzier,R.,et al.2011,MNRAS,412,1081
Wang,J.,Kauffmann,G.,Overzier,R.,et al.2012,MNRAS,423,3486
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Willett,K.W.,Lintott,C.J.,Bamford,S.P.,et al.2013,MNRAS,435,2835
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1http://wwwmpa.mpa-garching.mpg.de/SDSS/DR7/oh.html
2http:/zoo2.galaxyzoo.org/
Baldwin,J.A.,Phillips,M.M.,&Terlevich,R.1981,PASP,93,5
Barnes,J.E.,&Hernquist,L.1996,ApJ,471,115
Ben?tez-Llambay,A.,Navarro,J.F.,Abadi,M.G.,et al.2016,MNRAS,456,1185
Blanton,M.R.,Kazin,E.,Muna,D.,Weaver,B.A.,&PriceWhelan,A.2011,AJ,142,31
Borne,K.D.,Bushouse,H.,Colina,L.,et al.1999,Ap&SS,266,137
Brinchmann,J.,Charlot,S.,White,S.D.M.,et al.2004,MNRAS,351,1151
Bundy,K.,Bershady,M.A.,Law,D.R.,et al.2015,ApJ,798,7
Chen,Y.-M.,Shi,Y.,Tremonti,C.A.,et al.2016,Nature Communications,7,13269
Dalcanton,J.J.2007,ApJ,658,941
Drory,N.,Mac Donald,N.,Bershady,M.A.,et al.2015,AJ,149,77
Gallart,C.,Stetson,P.B.,Meschin,I.P.,Pont,F.,&Hardy,E.2008,ApJ,682,L89
Gunn,J.E.,Siegmund,W.A.,Mannery,E.J.,et al.2006,AJ,131,2332
Holmes,L.,Spekkens,K.,S′anchez,S.F.,et al.2015,MNRAS,451,4397
Jin,Y.,Chen,Y.,Shi,Y.,et al.2016,MNRAS,463,913
Kauffmann,G.,Heckman,T.M.,Tremonti,C.,et al.2003,MNRAS,346,1055
Kewley,L.J.,Dopita,M.A.,Sutherland,R.S.,Heisler,C.A.,&Trevena,J.2001,ApJ,556,121
Krajnovic,D.,Cappellari,M.,de Zeeuw,P.T.,&Copin,Y.2006,MNRAS,366,787
Law,D.R.,Yan,R.,Bershady,M.A.,et al.2015,AJ,150,19
Law,D.R.,Cherinka,B.,Yan,R.,et al.2016,AJ,152,83
Li,C.,Kauffmann,G.,Heckman,T.M.,White,S.D.M.,&Jing,Y.P.2008,MNRAS,385,1915
Li,C.,Wang,E.,Lin,L.,et al.2015,ApJ,804,125
Lian,J.,Thomas,D.,Maraston,C.,et al.2018,MNRAS,476,3883
Lin,L.,Li,C.,He,Y.,Xiao,T.,&Wang,E.2017,ApJ,838,105
Lin,L.,Zou,H.,Kong,X.,et al.2013,ApJ,769,127
Padilla,N.D.,&Strauss,M.A.2008,MNRAS,388,1321
Pan,Z.,Li,J.,Lin,W.,et al.2015,ApJ,804,L42
Perez,E.,Cid Fernandes,R.,Gonz′alez Delgado,R.M.,et al.2013,ApJ,764,L1
Regan,M.W.,&Teuben,P.J.2004,ApJ,600,595
Smee,S.A.,Gunn,J.E.,Uomoto,A.,et al.2013,AJ,146,32
Strauss,M.A.,Weinberg,D.H.,Lupton,R.H.,et al.2002,AJ,124,1810
Tremonti,C.A.,Heckman,T.M.,Kauffmann,G.,et al.2004,ApJ,613,898
Trouille,L.,Barger,A.J.,&Tremonti,C.2011,ApJ,742,46
Wake,D.A.,Bundy,K.,Diamond-Stanic,A.M.,et al.2017,AJ,154,86
Wang,J.,Kauffmann,G.,Overzier,R.,et al.2011,MNRAS,412,1081
Wang,J.,Kauffmann,G.,Overzier,R.,et al.2012,MNRAS,423,3486
Wang,E.,Li,C.,Xiao,T.,et al.2018,ApJ,856,137
Willett,K.W.,Lintott,C.J.,Bamford,S.P.,et al.2013,MNRAS,435,2835
Yan,R.,Tremonti,C.,Bershady,M.A.,et al.2016,AJ,151,8
1http://wwwmpa.mpa-garching.mpg.de/SDSS/DR7/oh.html
2http:/zoo2.galaxyzoo.org/