Bibcode
DOI
Cairós, Luz M.; Caon, N.; Papaderos, Polychronis; Noeske, Kai; Vílchez, José M.; García Lorenzo, Begoña; Muñoz-Tuñón, Casiana
Bibliographical reference
The Astrophysical Journal, Volume 593, Issue 1, pp. 312-332.
Advertised on:
8
2003
Journal
Citations
58
Refereed citations
53
Description
We analyze J, H, and Ks near-infrared data for nine blue
compact dwarf (BCD) galaxies, selected from a larger sample that we have
already studied in the optical. We present contour maps, surface
brightness and color profiles, and color maps of the sample galaxies.
The morphology of the BCDs in the near-infrared (NIR) has been found to
be basically the same as in the optical. The inner regions of these
systems are dominated by the starburst component. At low surface
brightness levels the emission is due to the underlying host galaxy; the
latter is characterized by red, radially constant colors and isophotes
well fitted by ellipses. We derive accurate optical-NIR host galaxy
colors for eight of the sample galaxies; these colors are typical of an
evolved stellar population. Interestingly, optical-NIR color maps reveal
the presence of a complex, large-scale absorption pattern in three of
the sample galaxies. We study the applicability of the Sérsic law
to describe the surface brightness profiles of the underlying host
galaxy and find that, because of the limited surface brightness interval
over which the fit can be made, the derived Sérsic parameters are
very sensitive to the selected radial interval and to errors in the sky
subtraction. Fitting an exponential model gives generally more stable
results and can provide a useful tool to quantify the structural
properties of the host galaxy and compare them with those of other dwarf
classes, as well as with those of star-forming dwarfs at higher
redshifts.