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J/A+A/556/A10 Multiband surface photometry of 21 BCGs (Micheva+ 2013)
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Beginning of ReadMe :J/A+A/556/A10 Multiband surface photometry of 21 BCGs (Micheva+ 2013)
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Deep multiband surface photometry on a sample of 24 blue compact galaxies.
II. A volume-limited sample of 21 emission line galaxies
Micheva G., Ostlin G., Zackrisson E., Bergvall N., Marquart T.,
Masegosa J., Marquez I., Cumming R.J., Durret F.
<Astron. Astrophys. 556, A10 (2013)>
=2013A&A...556A..10M
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ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI ; Photometry, infrared
Keywords: galaxies: photometry - galaxies: starburst - galaxies: dwarf -
galaxies: irregular
Abstract:
We present deep surface photometry of a volume-limited sample of 21 UM
emission line galaxies in broadband optical UBVRI and near infra-red
(NIR) HKs filters. The sample comprises 19 blue compact galaxies
(BCGs) and two spirals. For some targets the exposure times are the
deepest to date. For the BCG UM462 we observe a previously undetected
second disk component beyond a surface brightness level of
mu_B_=26mag/arcsec^2^. This is a true low surface brightness component
with central surface brightness mu_0_=24.1mag/arcsec^2^ and scale
length h_r_=1.5kpc. All BCGs are dwarfs, with M_B_>=-18, and very
compact, with an average scale length of h_r_ 1kpc. We separate the
burst and host populations for each galaxy and compare them to stellar
evolutionary models with and without nebular emission contribution. We
also measure the A_180_ asymmetry in all filters and detect a shift
from optical to NIR in the average asymmetry of the sample. This shift
seems to be correlated with the morphological class of the BCGs. Using
the color-asymmetry relation, we identify five BCGs in the sample as
mergers, which is confirmed by their morphological class. Though
clearly separated from normal galaxies in the concentration-asymmetry
parameter space, we find that it is not possible to distinguish
luminous starbursting BCGs from the merely star forming low luminosity
BCGs.
Description:
The data consist of optical and NIR broadband imaging (UBVRIHKs),
obtained during the period 2003-2007 with ALFOSC (at the Nordic
Optical Telescope, NOT, La Palma), MOSCA (NOT), and EMMI (at the
European Southern Observatory New Technology Telescope, ESO NTT, La
Silla) in the optical, and with NOTCAM (NOT) and SOFI (ESO NTT) in the
NIR.
Very deep observations are of a volume-limited sample of 21 Blue
Compact Galaxies (Emission line galaxies). The images are reduced
(bias correction, flatfielding, normalized, aligned, skysubtracted).
Calibration to the Vega photometric system in the optical based on
Landolt standard stars; in the NIR on 2MASS field stars found in each
frame. Total exposure time (seconds) in each filter and galaxy is
included in each FITS header as TOTALTIM. Cosmic rays have not been
removed.