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Astron. Astrophys. 341, 725-739 (1999)


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B and R CCD surface photometry of late-type galaxies

J.V. Smoker 2,1, D.J. Axon 1,3 and R.D. Davies 1

1 University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, UK
2 Astrophysics and Planetary Science Division, Department of Pure and Applied Physics, The Queen's University of Belfast, University Road, Belfast, BT7 1NN, Northern Ireland (e-mail: jvs@star.pst.qub.ac.uk)
3 Space Science Division of ESA, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Received 11 May 1998 / Accepted 20 August 1998

Abstract

We present B and R CCD observations of 16 late-type galaxies, mainly Magellanic irregulars and blue compact galaxies, at a limiting surface brightness of [FORMULA] [FORMULA] 26-27 mag arcsec-2. The sample is derived from a H I -rich subset of an H I survey of late-type dwarfs and consists of objects with [FORMULA], nine galaxies being fainter than [FORMULA]=-17 ([FORMULA]=75 km s-1 Mpc-1). Radial luminosity distributions for all the sample objects are presented. We find that the blue compacts become redder in [FORMULA] with increasing distances from their centres confirming other studies indicating that recent star formation in these galaxies may be centrally concentrated. The Im and Sm galaxies show flatter [FORMULA] colour profiles indicating less centrally concentrated recent star formation. The majority of the galaxies have an identifiable exponential disk while half also have a central bulge.

Key words: galaxies: photometry – galaxies: irregular – galaxies: fundamental parameters – galaxies: compact

Send offprint requests to: J.V. Smoker

© European Southern Observatory (ESO) 1999

Online publication: December 16, 1998

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