Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-27
Mon.Not.Roy.Astron.Soc.Lett.378:L6-L10,2007
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, accepted for publication in MNRAS Letters
Scientific paper
10.1111/j.1745-3933.2007.00307.x
We examine how the location of star formation within disc galaxies depends on environment at intermediate redshift. This is achieved by comparing emission-line (r_em) and restframe B-band (r_B) scalelengths for matched samples of 50 field and 19 cluster star-forming, disc galaxies, with 0.25 < z < 1.0 and M_B < -19.5 mag. We find that at a given r_B the majority of our cluster galaxies have r_em smaller than those in the field, by 25 percent on average. These results are compared with studies of local galaxies, which find a very similar behaviour. From the relations of r_em and r_B versus B-band absolute magnitude (M_B) we infer that the difference between the intermediate-z cluster and field samples is mostly attributable to variation in r_em at a given M_B, while the r_B versus M_B relation is similar for the two samples.
Aragon-Salamanca Alfonso
Bamford Steven P.
Milvang-Jensen B.
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