Publication Abstracts

Bergvall et al. 2016

Bergvall, N., T. Marquart, M.J. Way, A. Blomqvist, E. Holst, G. Östlin, and E. Zackrisson, 2016: Local starburst galaxies and their descendants: Statistics from the Sloan Digital Sky Survey. Astron. Astrophys., 587, A72, doi:10.1051/0004-6361/201525692.

Despite the frequent discussion of the starburst phenomenon, the concept remains ill-defined. Here we use a strict definition of starburst to examine the statistical properties of local starburst galaxies. We also seek to establish a link between starburst, post-starburst (hereafter postburst) galaxies, and active galaxies.

Data were selected from the Sloan Digital Sky Survey DR7. We applied a novel method of treating dust attenuation and derive star formation rates, ages, and stellar masses assuming a two-component stellar population model. Dynamical masses are calculated from the width of the Hα line. These masses agree excellently with the photometric masses. The mass (gas+stars) range is ∼109-1011.5 M. As a selection criterion for starburst galaxies, we use, the birthrate parameter, b = SFR/<SFR>, requiring that b ≥ 3. For postburst galaxies, we use, the equivalent width of Hδ in absorption with the criterion EWHδ,abs ≥ 6 Å.

We find that only 1% of star-forming galaxies are starburst galaxies. They contribute 3-6% to the stellar production and are therefore unimportant for the local star formation activity. The median starburst age is 70 Myr roughly independent of mass, indicating that star formation is mainly regulated by local feedback processes. The b-parameter strongly depends on burst age. Values close to b = 60 are found at ages ∼10 Myr, while almost no starbursts are found at ages >1 Gyr. The median baryonic burst mass fraction of sub-L+ galaxies is 5% and decreases slowly towards high masses. The median mass fraction of the recent burst in the postburst sample is 5-10%. A smaller fraction of the postburst galaxies, however, originates in non-bursting galaxies. The age-mass distribution of the postburst progenitors (with mass fractions >3%) is bimodal with a break at log M(M) ∼ 10.6, above which the ages are doubled. The starburst and postburst luminosity functions (LFs) follow each other closely until M4 ∼ -21, when active galactic nuclei (AGNs) begin to dominate. The postburst LF continues to follow the AGN LF, while starbursts become less significant. This suggests that the number of luminous starbursts is underestimated by about one dex at high luminosities, because of having large amounts of dust and/or being outshone by an AGN. It also indicates that the starburst phase preceded the AGN phase. Finally, we look at the conditions for global gas outflow caused by stellar feedback and find that massive starburst galaxies are susceptible to such outflows.

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BibTeX Citation

  author={Bergvall, N. and Marquart, T. and Way, M. J. and Blomqvist, A. and Holst, E. and Östlin, G. and Zackrisson, E.},
  title={Local starburst galaxies and their descendants: Statistics from the Sloan Digital Sky Survey},
  journal={Astron. Astrophys.},

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RIS Citation

ID  - be09100t
AU  - Bergvall, N.
AU  - Marquart, T.
AU  - Way, M. J.
AU  - Blomqvist, A.
AU  - Holst, E.
AU  - Östlin, G.
AU  - Zackrisson, E.
PY  - 2016
TI  - Local starburst galaxies and their descendants: Statistics from the Sloan Digital Sky Survey
JA  - Astron. Astrophys.
VL  - 587
SP  - A72
DO  - 10.1051/0004-6361/201525692
ER  -

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