Bibcode
Knapen, J. H.; Erroz-Ferrer, S.; Roa, Javier; Bakos, J.; Cisternas, M.; Leaman, R.; Szymanek, Nik
Referencia bibliográfica
Astronomy and Astrophysics, Volume 569, id.A91, 18 pp.
Advertised on:
9
2014
Revista
Número de citas
29
Número de citas referidas
27
Descripción
Context. The Spitzer Survey for Stellar Structure in Galaxies
(S4G) and its more recently approved extension will lead to a
set of 3.6 and 4.5 μm images for 2829 galaxies, which can be used to
study many different aspects of the structure and evolution of local
galaxies. Aims: We have collected and re-reduced optical images
of 1768 of the survey galaxies, aiming to make these available to the
community as ready-to-use FITS files to be used in conjunction with the
mid-IR images. Our sky-subtraction and mosaicking procedures were
optimised for imaging large galaxies. We also produce false-colour
images of some of these galaxies to be used for illustrative and public
outreach purposes. Methods: We collected and re-processed images
in five bands from the Sloan Digital Sky Survey for 1657 galaxies, which
are publicly released with the publication of this paper. We observed,
in only the g-band, an additional 111 S4G galaxies in the
northern hemisphere with the 2.5 m Liverpool Telescope, so that optical
imaging is released for 1768 galaxies, or for 62% of the S4G
sample. We visually checked all images. We noted interactions and close
companions in our optical data set and in the S4G sample,
confirming them by determining the galaxies’ radial velocities and
magnitudes in the NASA-IPAC Extragalactic Database. Results: We
find that 17% of the S4G galaxies (21% of those brighter than
13.5 mag) have a close companion (within a radius of five times the
diameter of the sample galaxy, a recession velocity within ± 200
km s-1 and not more than 3 mag fainter) and that around 5% of
the bright part of the S4G sample show significant
morphological evidence of an ongoing interaction. This confirms and
further supports previous estimates of these fractions.
Conclusions: The over 8000 science images described in this paper, the
re-processed Sloan Digital Sky Survey ones, the new Liverpool Telescope
images, the set of 29 false-colour pictures, and the catalogue of
companion and interacting galaxies, are all publicly released for
general use for scientific, illustrative, or public outreach purposes.
Full Tables 1 and 2 and FITS files of the images are available at the
Centre de Données astronomiques de Strasbourg (CDS) via anonymous
ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/569/A91
The images are also offered through the NASA/IPAC Extragalactic Database
(NED).
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