The Physical Nature and Age of Lyman Alpha Galaxies

Details The Physical Nature and Age of Lyman Alpha Galaxies The Physical Nature and Age of Lyman Alpha Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40009m&link_type=abstract

Spitzer Proposal ID #40009

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Scientific paper

In the simplest scenario, strong Lyman alpha emission from high redshift galaxies would indicatethat stellar populations younger than 10 Myrs dominate the UV. This does not, however, constrain thestellar populations older than 100 Myrs, which do not contribute to UV light. Also, the Lyman alphaline can be boosted if the interstellar medium is both clumpy and dusty. Different studies withsmall samples have reached different conclusions about the presence of dust and old stellarpopulations in Lyman alpha emitters. We propose HST-NICMOS and Spitzer-IRAC photometry of 35 Lyman-alpha galaxies at redshift4.5 8) not easily probed by anyother means. (2) The dust extinction in the rest-frame UV, and therefore a correction to theirpresent star-formation rates. Taken together, these two quantities will yield the star-formation histories of Lyman alphagalaxies, which form fully half of the known galaxies at z=4-6. They will tell us whether these areyoung or old galaxies by straddling the 4000A break. Data from NICMOS is essential for these compactand faint (i=25-26th magnitude AB) high redshift galaxies, which are too faint for good near-IRphotometry from the ground.

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