J/MNRAS/464/666 Void Galaxy Survey, photometry and structure (Beygu+, 2017)
The Void Galaxy Survey: photometry, structure and identity of void galaxies.
Beygu B., Peletier R.F., van der Hulst J.M., Jarrett T.H., Kreckel K.,
van de Weygaert R., van Gorkom J.H., Aragon-Calvo M.A.
<Mon. Not. R. Astron. Soc., 464, 666-679 (2017)>
=2017MNRAS.464..666B 2017MNRAS.464..666B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Morphology ;
Photometry, millimetric/submm ; Photometry, UBV
Keywords: galaxies: formation - galaxies: photometry - galaxies: structure -
cosmology: observations - large-scale structure of Universe
Abstract:
We analyse photometry from deep B-band images of 59 void galaxies in
the Void Galaxy Survey (VGS), together with their near-infrared
3.6µm and 4.5µm Spitzer photometry. The VGS galaxies constitute
a sample of void galaxies that were selected by a
geometric-topological procedure from the Sloan Digital Sky Survey Data
Release 7 data release, and which populate the deep interior of voids.
Our void galaxies span a range of absolute B-magnitude from MB=-15.5
to -20, while at the 3.6µm band their magnitudes range from
M3.6=-18 to -24. Their B-[3.6] colour and structural parameters
indicate these are star-forming galaxies. A good reflection of the old
stellar population, the near-infrared band photometry also provide a
robust estimate of the stellar mass, which for the VGS galaxies we
confirm to be smaller than 3x1010M☉. In terms of the
structural parameters and morphology, our findings align with other
studies in that our VGS galaxy sample consists mostly of small
late-type galaxies. Most of them are similar to Sd-Sm galaxies,
although a few are irregularly shaped galaxies. The sample even
includes two early-type galaxies, one of which is an AGN. Their Sersic
indices are nearly all smaller than n=2 in both bands and they also
have small half-light radii. In all, we conclude that the principal
impact of the void environment on the galaxies populating them mostly
concerns their low stellar mass and small size.
Description:
The VGS (van de Weygaert et al. 2011, Environment and the Formation of
Galaxies: 30 Years Later. Springer-Verlag, Berlin, p. 17; Kreckel et
al. 2011AJ....141....4K 2011AJ....141....4K, 2011AJ....144...16J 2011AJ....144...16J, Cat. J/AJ/144/16; Beygu
et al. 2016MNRAS.458..394B 2016MNRAS.458..394B) is a systematic multiwavelength survey of
59 void galaxies, aiming to probe the colour, morphology, star
formation and gas content of the void galaxies. For this we observed
the VGS galaxies at radio wavelengths, in the 21-cm line, in Hα
and in the optical B band. In addition, we acquired the Galaxy
Evolution Explorer (GALEX) near-UV data on the VGS galaxies, as well
as Spitzer 3.6um imaging. For some we obtained CO(1-0) observations,
which will form the starting point for a study of the relation between
their star formation activity and their molecular and atomic gas
content.
We analysed Spitzer 3.6 and 4.5um and B-band imaging of 59 void
galaxies as part of the VGS to study their colour, stellar mass,
galaxy concentration, morphology and star formation properties.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 65 Photometric results of the VGS galaxies
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See also:
J/AJ/144/16 : Optical and HI properties of galaxies in voids (Kreckel+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [VGS]
5- 6 I2 --- VGS Galaxy name (VGS NN),
[KPA2011] VGS NNa in Simbad
7 A1 --- n_VGS [ab] Multiplicity index on VGS
9- 12 F4.2 kpc rP50r ?=- SDSS Petrosian half-radius in
SDSS r-band
14- 17 F4.2 kpc rP50g ?=- SDSS Petrosian half-radius in
SDSS g-band
19- 22 F4.2 --- nB ?=- B-band Sersic index
24- 27 F4.2 kpc reB ?=- Effective radius in B-band
29- 33 F5.2 mag/arcsec+2 mueB ?=- Effective surface brightness in B-band
35- 38 F4.2 --- n[3.6] ?=- [3.6] Sersic index
40- 43 F4.2 kpc re[3.6] ?=- Effective radius in [3.6]
45- 49 F5.2 mag/arcsec+2 mue[3.6] ?=- Effective surface brightness in [3.6]
51- 56 F6.2 mag BMAG ?=- Absolute magnitude in B-band
58- 63 F6.2 mag [3.6]MAG ?=- Absolute magnitude in [3.6]
65- 68 F4.2 mag B-[3.6] ?=- B-[3.6] colour index
70- 72 F3.1 arcsec Seeing ?=- Seeing (FWHMPSF)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-May-2018