New insights to the photometric structure of Blue Compact Dwarf Galaxies from deep near-infrared studies

Free access article

Issue		A&A Volume 429, Number 1, January I 2005


Page(s)		115 - 127
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20040221

A&A 429, 115-127 (2005)
DOI: 10.1051/0004-6361:20040221

II. The sample of northern BCDs

K. G. Noeske^{1, 2}, P. Papaderos¹, L. M. Cairós¹ and K. J. Fricke¹

¹ Universitäts-Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany
e-mail: kai@ucolick.org
² Lick Observatory, Univ. of California, 1156 High Street, Santa Cruz, CA 95064, USA

(Received 7 February 2004 / Accepted 14 June 2004)

Abstract
This paper is part of a series of publications which present a systematic study of Blue Compact Dwarf (BCD) Galaxies in the near infrared (NIR). Compared to the visible light, NIR data allow a better separation of the starburst emission 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 11 BCDs, observed with the Calar Alto 3.6 m telescope. This work enlarges the samples presented in preceding papers of this study (Noeske et al. 2003, A&A, 410, 481; Cairós et al. 2003, ApJ, 593, 312) by BCDs of the most common morphological type, displaying a regular elliptical LSB host galaxy. The data presented here allow the detection and quantitative study of the extended stellar LSB host galaxy in all sample BCDs. The NIR surface brightness profiles (SBPs) of the LSB host galaxies agree at large galactocentric radii with those from optical studies, showing also an exponential intensity decrease and compatible scale lengths. Similar to Noeske et al. (2003), we find centrally flattening exponential (type V) SBPs of the host galaxy for several BCDs. Such SBPs remain mostly undetected in optical bands, due to the comparatively stronger starburst emission at these wavelengths. We apply a modified exponential distribution to decompose and quantitatively 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 their star-forming regions.

Key words: galaxies: dwarf -- galaxies: evolution -- galaxies: structure -- galaxies: starburst

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