Is There Diffuse Lyman-alpha Emission Around Lyman-alpha Galaxies?

Details Is There Diffuse Lyman-alpha Emission Around Lyman-alpha Galaxies? Is There Diffuse Lyman-alpha Emission Around Lyman-alpha Galaxies?

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934006s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #340.06

Astronomy and Astrophysics

Astronomy

Scientific paper

The Lyman alpha line is resonantly scattered, thus neutral gas within a galaxy can scatter these photons out into a diffuse halo. Understanding what fraction of the Lyman alpha photons do not make it directly out of the central galaxy is crucial to interpret high-redshift spectroscopic detections, or lack thereof, of Lyman alpha. However, thus far these halos have only been observed in a few instances. We study these halos at z=4.5 by coadding narrow-band images containing the Lyman-alpha emission line for a sample of 200 spectroscopically confirmed Lyman-alpha galaxies. Thus stacking allows us to probe to very faint surface brightness levels. We compare the Lyman alpha surface brightness distribution of Lyman-alpha-selected galaxies with Lyman-break galaxies to see if these two samples differ in their general nature.

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