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Title

A spectroscopic measure of the star formation rate density in dwarf galaxies at z similar to 1

Author(s)

Davies, G. T.;  Gilbank, David;  Glazebrook, K.;  Bower, Richard G.;  Baldry, I. K.;  Balogh, Michael L.;  Hau, G. K. T.;  Li, I. H.;  McCarthy, Patrick J.;  Savaglio, S.

Abstract

We use a K-selected (22.5 < K-AB < 24.0) sample of dwarf galaxies (8.4 < log(M-*/M-circle dot) < 10) at 0.89 < z < 1.15 in the Chandra Deep Field-South to measure their contribution to the global star formation rate density (SFRD), as inferred from their [O II] flux. By comparing with [O II]-based studies of higher stellar mass galaxies, we robustly measure a turnover in the [O II] luminosity density at a stellar mass of M similar to 10(10) M-circle dot. By comparison with the [O II]-based SFRD measured from the Sloan Digital Sky Survey we confirm that, while the SFRD of the lowest mass galaxies changes very little with time, the SFRD of more massive galaxies evolves strongly, such that they dominate the SFRD at z = 1.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Monthly Notices of the Royal Astronomical Society: Letters, Vol. 395, no. 1 (May 2009), pp. L76-L80

Publication year

2009

Keyword(s)

Dwarf galaxies;  Evolution;  Formation history;  Galaxies;  H-alpha;  Luminosity function;  Metallicity;  O-II;  Redshift survey;  Stellar mass

Publisher

Wiley-Blackwell Publishing

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1111/j.1745-3933.2009.00646.x

Copyright

Copyright © 2009 The Authors. Journal compilation copyright © 2009 RAS.

Research Projects

The broken hierarchy of galaxy formation, Australian Research Council grant number DP0774469

Full text

Peer reviewed