Bibcode
Vaduvescu, O.; Petropoulou, V.; Reverte, D.; Pinter, V.
Bibliographical reference
Astronomy and Astrophysics, Volume 616, id.A165, 21 pp.
Advertised on:
9
2018
Journal
Citations
2
Refereed citations
1
Description
Context. We continue to study star formation in dwarf galaxies located
in nearby clusters. Aims: 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. Methods: 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. Results: 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.
Conclusions: 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.
Based on observations made with the Telescopio Nationale Galileo (TNG)
in La Palma.Reduced images as FITS files are only available at the 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/616/A165