Low signal-to-noise spectroscopy and surface photometry of two faint galaxies in the field of NGC 7479

Free access article

Issue		A&A Volume 409, Number 3, October III 2003


Page(s)		899 - 906
Section		Galactic structure and dynamics
DOI		http://dx.doi.org/10.1051/0004-6361:20031219

A&A 409, 899-906 (2003)
DOI: 10.1051/0004-6361:20031219

Low signal-to-noise spectroscopy and surface photometry of two faint galaxies in the field of NGC 7479

M. F. Saraiva¹ and G. F. Benedict²

¹ Departamento de Astronomia, Instituto de Física, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CP 15051, 91501-970 Porto Alegre, RS, Brasil
² Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, Texas 78712-1083, USA
e-mail: fritz@astro.as.utexas.edu

(Received 16 April 2003 / Accepted 29 July 2003)

Abstract
We present low signal-to-noise spectroscopy and surface photometry of two small galaxies, detected in the field of the nearby asymmetric barred spiral NGC $\,$ 7479, near a prolongation of the western arm that forms a faint tail in the disc, and selected as possible companions of this galaxy. The analysis was based on data obtained with the Prime Focus Camera (PFC) at the 0.8 m telescope of McDonald Observatory, and the Low Resolution Spectroscope (LRS) at the 9.2 m Hobby-Eberly Telescope (HET). We determined radial velocities using cross correlation with 15 different templates, and derived integrated magnitudes, colors and brightness profiles for each.

The derived radial velocities are around 35 $\,$ 500 $\mathrm{km\,s^{-1}}$ for one galaxy and 38 $\,$ 000 $\mathrm{km\,s^{-1}}$ for the other, which clearly indicates that both are far more distant than the nearby NGC $\,$ 7479. The absolute magnitudes and diameters of these two background galaxies are typical of normal galaxies, and their colors are similar to other galaxies with similar redshifs. NGC $\,$ 7479 continues to exist in isolation with no detected companion.

Key words: galaxies: individual: NGC 7479 -- galaxies: photometry

Offprint request: M. F. Saraiva, fatima@if.ufrgs.br

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