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Journal ArticleDOI

Galaxy evolution explorer ultraviolet color-magnitude relations and evidence of recent star formation in early-type galaxies

TLDR
In this article, the authors used the GALEX UV photometric data to construct a near-ultraviolet color-magnitude relation (CMR) for the galaxies pre-classified as early-type by SDSS studies.
Abstract
We have used the GALEX UV photometric data to construct a first near-ultraviolet (NUV) color-magnitude relation (CMR) for the galaxies pre-classified as early-type by SDSS studies. The NUV CMR is a powerful tool for tracking the recent star formation history in early-type galaxies, owing to its high sensitivity to the presence of young stellar populations. Our NUV CMR for UV-weak galaxies shows a well-defined slope and thus will be useful for interpreting the restframe NUV data of distant galaxies and studying their star formation history. Compared to optical CMRs, the NUV CMR shows a substantially larger scatter, which we interpret as evidence of recent star formation activities. Roughly 15% of the recent epoch (z < 0.13) bright (M[r] < -22) early-type galaxies show a sign of recent (< 1Gyr) star formation at the 1-2% level (lower limit) in mass compared to the total stellar mass. This implies that low level residual star formation was common during the last few billion years even in bright early-type galaxies.

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Galaxy luminosity functions to z∼ 1 from DEEP2 and COMBO-17: Implications for red galaxy formation

TL;DR: The DEEP2 and COMBO-17 surveys are compared to study luminosity functions of red and blue galaxies to z ~ 1, and the results imply that the number and total stellar mass of blue galaxies have been substantially constant since z = 1, whereas those of red galaxies (near L*) have been significantly rising as mentioned in this paper.
Journal ArticleDOI

A semi-analytic model for the co-evolution of galaxies, black holes and active galactic nuclei

TL;DR: In this paper, a semi-analytic model that self-consistently traces the growth of supermassive black holes and their host galaxies within the context of the Lambda cold dark matter (� CDM) cosmological framework is presented.
References
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Journal ArticleDOI

Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds

TL;DR: In this article, a reprocessed composite of the COBE/DIRBE and IRAS/ISSA maps, with the zodiacal foreground and confirmed point sources removed, is presented.
Journal ArticleDOI

Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds

TL;DR: In this paper, the authors presented a reprocessed composite of the COBE/DIRBE and IRAS/ISSA maps, with the zodiacal foreground and confirmed point sources removed.
Journal ArticleDOI

The Sloan digital sky survey photometric system

TL;DR: In this paper, the Sloan Digital Sky Survey photometric system, a new five-color (u' g' r' i' z') wide-band CCD system with wavelength coverage from 3000 to 11 000 A.
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Do all irregular galaxies have active star formation?

This implies that low-level residual star formation was common during the last few billion years even in bright early-type galaxies.