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Title:
The physical nature of Lyman-alpha galaxie
Authors:
Malhotra, Sangeeta; Rhoads, J.; Pirzkal, N.; Kovac, K.; Finkelstein, S.; Wang, J.; LALA collaboration
Affiliation:
AA(Arizona State University), AB(Arizona State University), AC(Space Telescope Science Institute), AD(Kapteyn Institute, The Netherlands), AE(Arizona State University), AF(University of Science and Technology of China, China), AG()
Publication:
American Astronomical Society Meeting 210, #97.03; Bulletin of the American Astronomical Society, Vol. 38, p.226
Publication Date:
05/2007
Origin:
AAS
Bibliographic Code:
2007AAS...210.9703M

Abstract

A strong Lyman-alpha line allows for robust selection of high redshift galaxies. At least half of known high redshift galaxies show Lyman-alpha line emission. I will review different lines of evidence that shows the essential nature of these galaxies. Clustering properties show that the duty cycle of the Lyman-alpha phase is about 10 percent. Recent continuum detections of these galaxies with HST, MMT and Spitzer allow us to address questions about their stellar

populations and ages. By and large, the Lyman-alpha galaxies are young

galaxies, dominated by stellar populations that are less than 25

Million years old. The observed youth of the galaxies and the

luminosity function of Lyman-alpha and Lyman-break galaxies also

support a duty cycle of about 10 percent. The lack of redshift

evolution of Lyman-alpha galaxies between z=3-6.6 is also consistent

with this scenario.

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Database: Astronomy
Physics
arXiv e-prints