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Gil de Paz, Armando and Aragón Salamanca, A. and Gallego Maestro, Jesús and Alonso Herrero, A. and Zamorano Calvo, Jaime and Kauffmann, G. (2000) Star formation properties of Universidad Complutense de Madrid survey galaxies. Monthly notices of the Royal Astronomical Society, 316 (2). pp. 357-373. ISSN 0035-8711
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Official URL: http://dx.doi.org/10.1046/j.1365-8711.2000.03501.x
Abstract
We present new near-infrared J and K imaging data for 67 galaxies from the Universidad Complutense de Madrid (UCM) survey used in the determination of the SFR density of the local Universe by Gallego et al. This is a sample of local star-forming galaxies with redshift lower than 0.045, and they constitute a representative subsample of the galaxies in the complete UCM survey. From the new data, complemented with our own Gunn−r images and long-slit optical spectroscopy, we have measured integrated K-band luminosities, r−J and J−K colours, and Hα luminosities and equivalent widths. Using a maximum likelihood estimator and a complete set of evolutionary synthesis models, these observations allow us to estimate the strength of the current (or most recent) burst of star formation, its age, the star formation rate and the total stellar mass of the galaxies. An average galaxy in the sample has a stellar mass of 5×10^10 M_⊙ and is undergoing (or has recently completed) a burst of star formation involving about 2 per cent of its total stellar mass. We identify two separate classes of star-forming galaxies in the UCM sample: low-luminosity, high-excitation galaxies (HII-like) and relatively luminous spiral galaxies (starburst disk−like). The former show higher specific star formation rates (SFRs per unit mass) and burst strengths, and lower stellar masses than the latter. With regard to their specific star formation rates, the UCM galaxies are intermediate objects between normal quiescent spirals and the most extreme H II galaxies.
Item Type: | Article |
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Additional Information: | © 2000 RAS. |
Uncontrolled Keywords: | Hubble deep field; Emission-line galaxies; Spectral energy-distributions; Formation history; Morphological analysis; Starburst galaxies; Redshift galaxies; Disk galaxies; UCM galaxies; Ultraviolet |
Subjects: | Sciences > Physics > Astrophysics Sciences > Physics > Astronomy |
ID Code: | 34332 |
Deposited On: | 18 Nov 2015 15:29 |
Last Modified: | 10 Dec 2018 15:05 |
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