The physical nature of Lyman-alpha galaxie

Details The physical nature of Lyman-alpha galaxie The physical nature of Lyman-alpha galaxie

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9703m&link_type=abstract

American Astronomical Society Meeting 210, #97.03; Bulletin of the American Astronomical Society, Vol. 39, p.226

Astronomy and Astrophysics

Astronomy

Scientific paper

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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