Analysis of luminosity distributions and the shape parameters of strong gravitational lensing elliptical galaxies

被引:2
作者
Biernaux, J. [1 ]
Magain, P. [1 ]
Sluse, D. [1 ]
Chantry, V. [1 ]
机构
[1] Univ Liege, Dept Astrophys Geophys & Oceanog, Quartier Agora Bat B5c,Allee 6 Aout,19c, B-4000 Liege 1, Sart Tilman, Belgium
来源
ASTRONOMY & ASTROPHYSICS | 2016年 / 585卷
关键词
galaxies: elliptical and lenticular; cD; galaxies: luminosity function; mass function; gravitational lensing: strong; DARK-MATTER; FUNDAMENTAL PLANE; TIME DELAYS; COSMOGRAIL; STELLAR; LENSES; DECONVOLUTION; DECOMPOSITION; SDSS-J0924+0219; INTENSITY;
D O I
10.1051/0004-6361/201526910
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. The luminosity profiles of galaxies acting as strong gravitational lenses can be tricky to study. Indeed, strong gravitational lensing images display several lensed components, both point-like and diffuse, around the lensing galaxy. Those objects limit the study of the galaxy luminosity to its inner parts. Therefore, the usual fitting methods perform rather badly on such images. Previous studies of strong lenses luminosity profiles using software such as GALFIT or IMFITFITS and various PSF-determining methods have resulted in somewhat discrepant results. Aims. The present work aims at investigating the causes of those discrepancies, as well as at designing more robust techniques for studying the morphology of early-type lensing galaxies with the ability to subtract a lensed signal from their luminosity profiles. Methods. We design a new method to independently measure each shape parameter, namely, the position angle, ellipticity, and half-light radius of the galaxy. Our half-light radius measurement method is based on an innovative scheme for computing isophotes that is well suited to measuring the morphological properties of gravititational lensing galaxies. Its robustness regarding various specific aspects of gravitational lensing image processing is analysed and tested against GALFIT. It is then applied to a sample of systems from the CASTLES database. Results. Simulations show that, when restricted to small, inner parts of the lensing galaxy, the technique presented here is more trustworthy than GALFIT. It gives more robust results than GALFIT, which shows instabilities regarding the fitting region, the value of the Sersic index, and the signal-to-noise ratio. It is therefore better suited than GALFIT for gravitational lensing galaxies. It is also able to study lensing galaxies that are not much larger than the PSF. New values for the half-light radius of the objects in our sample are presented and compared to previous works.
引用
收藏
页数:18
相关论文
共 48 条
[1]   Planck 2013 results. XVI. Cosmological parameters [J].
Ade, P. A. R. ;
Aghanim, N. ;
Armitage-Caplan, C. ;
Arnaud, M. ;
Ashdown, M. ;
Atrio-Barandela, F. ;
Aumont, J. ;
Baccigalupi, C. ;
Banday, A. J. ;
Barreiro, R. B. ;
Bartlett, J. G. ;
Battaner, E. ;
Benabed, K. ;
Benoit, A. ;
Benoit-Levy, A. ;
Bernard, J. -P. ;
Bersanelli, M. ;
Bielewicz, P. ;
Bobin, J. ;
Bock, J. J. ;
Bonaldi, A. ;
Bond, J. R. ;
Borrill, J. ;
Bouchet, F. R. ;
Bridges, M. ;
Bucher, M. ;
Burigana, C. ;
Butler, R. C. ;
Calabrese, E. ;
Cappellini, B. ;
Cardoso, J. -F. ;
Catalano, A. ;
Challinor, A. ;
Chamballu, A. ;
Chary, R. -R. ;
Chen, X. ;
Chiang, H. C. ;
Chiang, L. -Y ;
Christensen, P. R. ;
Church, S. ;
Clements, D. L. ;
Colombi, S. ;
Colombo, L. P. L. ;
Couchot, F. ;
Coulais, A. ;
Crill, B. P. ;
Curto, A. ;
Cuttaia, F. ;
Danese, L. ;
Davies, R. D. .
ASTRONOMY & ASTROPHYSICS, 2014, 571
[2]   THE SLOAN LENS ACS SURVEY. X. STELLAR, DYNAMICAL, AND TOTAL MASS CORRELATIONS OF MASSIVE EARLY-TYPE GALAXIES [J].
Auger, M. W. ;
Treu, T. ;
Bolton, A. S. ;
Gavazzi, R. ;
Koopmans, L. V. E. ;
Marshall, P. J. ;
Moustakas, L. A. ;
Burles, S. .
ASTROPHYSICAL JOURNAL, 2010, 724 (01) :511-525
[3]  
BERTIN G, 1994, ASTRON ASTROPHYS, V292, P381
[4]   THE BOSS EMISSION-LINE LENS SURVEY. II. INVESTIGATING MASS-DENSITY PROFILE EVOLUTION IN THE SLACS plus BELLS STRONG GRAVITATIONAL LENS SAMPLE [J].
Bolton, Adam S. ;
Brownstein, Joel R. ;
Kochanek, Christopher S. ;
Shu, Yiping ;
Schlegel, David J. ;
Eisenstein, Daniel J. ;
Wake, David A. ;
Connolly, Natalia ;
Maraston, Claudia ;
Arneson, Ryan A. ;
Weaver, Benjamin A. .
ASTROPHYSICAL JOURNAL, 2012, 757 (01)
[5]   The Sloan Lens ACS Survey. I. A large spectroscopically selected sample of massive early-type lens galaxies [J].
Bolton, AS ;
Burles, S ;
Koopmans, LVE ;
Treu, T ;
Moustakas, LA .
ASTROPHYSICAL JOURNAL, 2006, 638 (02) :703-724
[6]   SMALL SCATTER AND NEARLY ISOTHERMAL MASS PROFILES TO FOUR HALF-LIGHT RADII FROM TWO-DIMENSIONAL STELLAR DYNAMICS OF EARLY-TYPE GALAXIES [J].
Cappellari, Michele ;
Romanowsky, Aaron J. ;
Brodie, Jean P. ;
Forbes, Duncan A. ;
Strader, Jay ;
Foster, Caroline ;
Kartha, Sreeja S. ;
Pastorello, Nicola ;
Pota, Vincenzo ;
Spitler, Lee R. ;
Usher, Christopher ;
Arnold, Jacob A. .
ASTROPHYSICAL JOURNAL LETTERS, 2015, 804 (01)
[7]   The ATLAS3D project - XX. Mass-size and mass-Σ distributions of early-type galaxies: bulge fraction drives kinematics, mass-to-light ratio, molecular gas fraction and stellar initial mass function [J].
Cappellari, Michele ;
McDermid, Richard M. ;
Alatalo, Katherine ;
Blitz, Leo ;
Bois, Maxime ;
Bournaud, Frederic ;
Bureau, M. ;
Crocker, Alison F. ;
Davies, Roger L. ;
Davis, Timothy A. ;
de Zeeuw, P. T. ;
Duc, Pierre-Alain ;
Emsellem, Eric ;
Khochfar, Sadegh ;
Krajnovic, Davor ;
Kuntschner, Harald ;
Morganti, Raffaella ;
Naab, Thorsten ;
Oosterloo, Tom ;
Sarzi, Marc ;
Scott, Nicholas ;
Serra, Paolo ;
Weijmans, Anne-Marie ;
Young, Lisa M. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 432 (03) :1862-1893
[8]   Deconvolution of HST images of the Cloverleaf gravitational lens - Detection of the lensing galaxy and a partial Einstein ring [J].
Chantry, V. ;
Magain, P. .
ASTRONOMY & ASTROPHYSICS, 2007, 470 (02) :467-473
[9]   COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars [J].
Chantry, V. ;
Sluse, D. ;
Magain, P. .
ASTRONOMY & ASTROPHYSICS, 2010, 522
[10]   Lensperfect:: Gravitational lens mass map reconstructions yielding exact reproduction of all multiple images [J].
Coe, D. ;
Fuselier, E. ;
Benitez, N. ;
Broadhurst, T. ;
Frye, B. ;
Ford, H. .
ASTROPHYSICAL JOURNAL, 2008, 681 (02) :814-830