J/A+A/616/A165 K' images of star-forming dwarf galaxies (Vaduvescu+, 2018)
Studying star forming dwarf galaxies in Abell 779, Abell 1367, Coma,
and Hercules clusters.
Vaduvescu O., Petropoulou V., Reverte D., Pinter V.
<Astron. Astrophys. 616, A165 (2018)>
=2018A&A...616A.165V 2018A&A...616A.165V (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, infrared
Keywords: galaxies: dwarf - galaxies: star formation - galaxies: photometry -
galaxies: clusters: general - galaxies: fundamental parameters -
galaxies: abundances
Abstract:
We continue to study star formation in dwarf galaxies located in
nearby clusters.
Known physical and chemical relations outlining the formation and
evolution of dwarfs is compared in different environments, including
the Local Volume (LV) and some nearby clusters studied previously.
We used the TNG telescope for four nights in 2010 to acquire deep
near-infrared imaging in K' of 45 star forming dwarf galaxies located
in the Abell 779, Abell 1367, Abell 1656 (Coma), and Abell 2151
(Hercules) clusters.
Surface photometry was approached based on past experience by using
the sech law to account for the outer old stellar contribution plus a
Gaussian component to model the inner starburst, proving the blue
compact dwarf (BCD) classification of most targets. Sech central
surface brightness, semimajor axis, sech, and total apparent magnitude
were measured, allowing to estimate size, absolute luminosity and mass
for all targets.
The physical correlations between size, central brightness, and NIR
luminosity appear to hold, but previously known linear fits break
above MSK=-19 for Abell 779, Abell 1367 and especially for Hercules,
while the dwarf fundamental plane (FP) is probed by only half cluster
members, suggesting harassment by the denser cluster environments.
Nevertheless, the chemical relations between the oxygen abundance,
luminosity, gas mass, baryonic mass, and gas fraction in a closed box
model are probed by most members of the four studied clusters, and the
starburst grows linearly with the K' luminosity.
Description:
Four nights were awarded at Roque de los Muchachos Observatory (ORM)
by the Spanish TAC between 30 Apr and 3 May 2010 (programme number
CAT_110). We used the Italian Telescopio Nationale Galileo (TNG) which
is equipped at one Nasmyth focus with the Near Infrared Camera
Spectrometer (NICS) based on a HgCdTe Hawaii 1024x1024 array (pixel
size 0.25" used for imaging over a relatively small field FOV
4.2'x4.2'. We used K' band for all our targets.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 167 40 List of fits images
fits/* . 40 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
25- 27 I3 --- Nx Number of pixels along X-axis
29- 31 I3 --- Ny Number of pixels along Y-axis
33- 42 A10 "date" Obs.Date Observation date
44- 46 I3 Kibyte size Size of FITS file
48-102 A55 --- FileName Name of FITS file, in subdirectory fits
104-167 A64 --- Title Title of the FITS file
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Acknowledgements:
Ovidiu Vaduvescu, ovidiuv(at)ing.iac.es
(End) Patricia Vannier [CDS] 05-Sep-2018