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Title

The HST/ACS Coma Cluster Survey III: structural parameters of galaxies using single Sersic fits star

Author(s)

Hoyos, Carlos;  den Brok, Mark;  Kleijn, Gijs Verdoes;  Carter, David;  Balcells, Marc;  Guzman, Rafael;  Peletier, Reynier;  Ferguson, Henry C.;  Goudfrooij, Paul;  Graham, Alister W.;  Hammer, Derek;  Karick, Arna M.;  Lucey, John R.;  Matkovic, Ana;  Merritt, David;  Mouhcine, Mustapha;  Valentijn, Edwin

Abstract

We present a catalogue of structural parameters for 8814 galaxies in the 25 fields of the Hubble Space Telescope/ACS Coma Treasury Survey. Parameters from Sersic fits to the two-dimensional surface brightness distributions are given for all galaxies from our published Coma photometric catalogue with mean effective surface brightness brighter than 26.0 mag arcsec-2 and brighter than 24.5 mag (equivalent to absolute magnitude -10.5), as given by the fits, all in F814W(AB). The sample comprises a mixture of Coma members and background objects; 424 galaxies have redshifts and of these 163 are confirmed members. The fits were carried out using both the gim2d and galfit codes. We provide the following parameters: galaxy ID, RA, Dec., the total corrected automatic magnitude from the photometric catalogue, the total magnitude of the model (F814W(AB)), the geometric mean effective radius R-e, the mean surface brightness within the effective radius <>(e), the Sersic index n, the ellipticity and the source position angle. The selection limits of the catalogue and the errors listed for the Sersic parameters come from extensive simulations of the fitting process using synthetic galaxy models. The agreement between gim2d and galfit parameters is sensitive to details of the fitting procedure; for the settings employed here the agreement is excellent over the range of parameters covered in the catalogue. We define and present two goodness-of-fit indices which quantify the degree to which the image can be approximated by a Sersic model with concentric, coaxial elliptical isophotes; such indices may be used to objectively select galaxies with more complex structures such as bulge-disc, bars or nuclear components. We make the catalogue available in electronic format at astro-wise and MAST.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Monthly Notices of the Royal Astronomical Society, Vol. 411, no. 4 (Mar 2011), pp. 2439-2460

Publication year

2011

FOR Code(s)

0201 Astronomical and Space Sciences

Keyword(s)

Cluster galaxies;  Coma cluster;  Dwarf galaxies;  Elliptical galaxies;  Fundamental parameters;  Galaxy evolution;  Lenticular galaxies

Publisher

Wiley-Blackwell Publishing

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1111/j.1365-2966.2010.17855.x

Copyright

Copyright © 2011 The Authors. Journal compilation copyright © 2011 Royal Astronomical Society. The accepted manuscript of the paper is reproduced here in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

Full text

Peer reviewed