New insights to the photometric structure of Blue Compact Dwarf Galaxies from deep Near-Infrared studies: II. The sample of northern BCDs

摘要

This paper is part of a series of publications which present a systematicstudy of Blue Compact Dwarf (BCD) Galaxies in the Near Infrared (NIR). Comparedto the visible light, NIR data allow a better separation of the starburstemission from the light distribution of the old stellar low-surface brightness(LSB) host galaxy. We analyze deep NIR broad band images of a sample of 11BCDs, observed with the Calar Alto 3.6m telescope. This work enlarges thesamples presented in preceding papers of this study (Noeske et al. 2003, Cairoset al. 2003) by BCDs of the most common morphological type, displaying aregular elliptical LSB host galaxy. The data presented here allow the detectionand quantitative study of the extended stellar LSB host galaxy in all sampleBCDs. The NIR surface brightness profiles (SBPs) of the LSB host galaxies agreeat large galactocentric radii with those from optical studies, showing also anexponential intensity decrease and compatible scale lengths. Similar to Noeskeet al. (2003), we find centrally flattening exponential (type V) SBPs of thehost galaxy for several BCDs. Such SBPs remain mostly undetected in opticalbands, due to the comparatively stronger starburst emission at thesewavelengths. We apply a modified exponential distribution to decompose andquantitatively analyze SBPs of LSB hosts with a type V intensity distribution.We present the results of the surface photometry and the decomposition of SBPs,and discuss individual objects with respect to morphological details of theirstar-forming regions.