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Title:
Lyman-alpha Emitters in the HUDF: A Population of Low Mass, Star Forming Galaxies
Authors:
Pirzkal, Norbert; Malhotra, S.; Rhoads, J. E.; Xu, C.
Affiliation:
AA(STScI), AB(Arizona State University), AC(Arizona State University), AD(STScI)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #171.01; Bulletin of the American Astronomical Society, Vol. 38, p.1145
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...20917101P

Abstract

We present observations of the Ly-alpha galaxies at reshifts 4<z<5.5 detected in the Hubble Ultra Deep Field. We show that these objects are young, low mass objects with characteristic ages of a few 106 Myr and masses < 108 Mȯ. These objects were identified based on the presence of strong Lyman-alpha emission in their low resolution ACS slitless spectra.

We present both our morphological analysis of these sources as well as our estimates of their masses, ages, and metalicities. The latter estimates are based on a thorough SED fitting of the broad band photometry that is available for these objects and using an extensive number of models. We have combined extremely deep HST/ACS, HST/NICMOS, VLT/ISAAC, and Spitzer/IRAC observations of these objects to provide us with a continuum rest-frame wavelength coverage ranging from the UV to the optical.

We observe that the color of these objects is extremely blue, and consistent with being dominated by a population of very young stars. The IRAC infrared observations, corresponding to the rest-frame optical, furthermore allow us to set upper limits on the amount of older stars present in these objects. We conclude that the Lyman-alpha emitters that we identified in the HUDF, and which should constitute a nearly complete sample between the redshifts of 4<z<5.5, are smaller, and sometimes significantly smaller, than 108 Mȯ. We further discuss the implications of having detected such low mass objects at these redshifts.

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