Stellar Populations of Lyman-alpha Emitters at z=4.86: A Comparison to $z\sim5$ LBGs

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

16 pages, 16 figures, accepted for publication in ApJ, Removed spurious extra figure files from arXiv

Scientific paper

(abridged) We present a study of stellar population of LAEs at z=4.86 in GOODS-N and its flanking field. With the publicly available IRAC data in GOODS-N and further IRAC observations in the flanking fields, we select five LAEs which are not contaminated by neighboring objects in IRAC images and construct their observed SEDs with I_c, z', IRAC 3.6micron, and 4.5micron band photometry. The SEDs cover the rest-frame UV to optical wavelengths. We derive stellar masses, ages, color excesses, and star formation rates of five LAEs using SED fitting method. Assuming the constant star formation history, we find that the stellar masses range from 10^8 to $10^{10} Msun with the median value of 2.5x10^9 Msun. The derived ages range from very young ages (7.4 Myr) to 437 Myr with a median age of 25 Myr. The color excess E(B-V) are between 0.1-0.4 mag. Star formation rates are 55-209 Msun/yr. A comparison of the stellar populations is made between three LAEs and 88 LBGs selected at the same redshift, in the same observed field, and down to the same limit of the rest-frame UV luminosity. These three LAEs are the brightest and reddest samples among the whole LAE samples at z=4.86. The LAEs distribute at the relatively faint part of UV-luminosity distribution of LBGs. Deriving the stellar properties of the LBGs by fitting their SEDs with the same model ensures that model difference does not affect the comparison. It is found that the stellar properties of the LAEs lie on distributions of those of LBGs. On average, the LAEs show less dust extinction, and lower star formation rates than LBGs, while the stellar mass of LAEs nearly lies in the middle part of the mass distribution of LBGs. However, the stellar properties of LAEs and LBGs are similar at the fixed UV or optical luminosity. We also examine the relations between the output properties from the SED fitting and the rest-frame Lya equivalent width.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Stellar Populations of Lyman-alpha Emitters at z=4.86: A Comparison to $z\sim5$ LBGs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Stellar Populations of Lyman-alpha Emitters at z=4.86: A Comparison to $z\sim5$ LBGs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Populations of Lyman-alpha Emitters at z=4.86: A Comparison to $z\sim5$ LBGs will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-350533

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.