The distribution of local star formation activity as a function of galaxy stellar mass, environment and morphology

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
76 Downloads (Pure)


We present a detailed inventory of star formation in the local Universe, dissecting the cosmic star formation budget as a function of key variables that influence the star formation rate (SFR) of galaxies: stellar mass, local environment and morphology. We use a large homogeneous dataset from the SDSS to first study how the star-formation budget in galaxies with stellar masses greater than log(M/MSun) = 10 splits as a function of each parameter separately. We then explore how the budget behaves as a simultaneous function of these three parameters. We show that the bulk of the star formation at z < 0.075 (~65 per cent) takes place in spiral galaxies, that reside in the field, and have stellar masses between 10 < log(M/MSun) < 10.9. The ratio of the cosmic star formation budget hosted by galaxies in the field, groups and clusters is 21:3:1. Morphological ellipticals are minority contributors to local star formation. They make a measurable contribution to the star formation budget only at intermediate to high stellar masses, 10.3 < log(M/MSun) < 11.2 (where they begin to dominate by number), and typically in the field, where they contribute up to ~13 per cent of the total star-formation budget. This inventory of local star formation serves as a z~0 baseline which, when combined with similar work at high redshift, will enable us to understand the changes in SFR that have occurred over cosmic time and offers a strong constraint on models of galaxy formation.
Original languageEnglish
Pages (from-to)4910–4917
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date7 Sept 2017
Publication statusPublished - 21 Dec 2017


  • astro-ph.GA


Dive into the research topics of 'The distribution of local star formation activity as a function of galaxy stellar mass, environment and morphology'. Together they form a unique fingerprint.

Cite this