| | |
| | |
Stat |
Members: 3645 Articles: 2'501'711 Articles rated: 2609
20 April 2024 |
|
| | | |
|
Article overview
| |
|
Probing the Physical Properties of z=4.5 Lyman Alpha Emitters with Spitzer | Keely D. Finkelstein
; Steven L. Finkelstein
; Vithal Tilvi
; Sangeeta Malhotra
; James E. Rhoads
; Norman A. Grogin
; Norbert Pirzkal
; Arjun Dey
; Buell T. Jannuzi
; Bahram Mobasher
; Sabrina Pakzad
; Brett Salmon
; Junzian Wang
; | Date: |
21 Sep 2015 | Abstract: | We present the results from a stellar population modeling analysis of a
sample of 162 z=4.5, and 14 z=5.7 Lyman alpha emitting galaxies (LAEs) in the
Bootes field, using deep Spitzer/IRAC data at 3.6 and 4.5 um from the Spitzer
Lyman Alpha Survey, along with Hubble Space Telescope NICMOS and WFC3 imaging
at 1.1 and 1.6 um for a subset of the LAEs. This represents one of the largest
samples of high-redshift LAEs imaged with Spitzer IRAC. We find that 30/162
(19%) of the z=4.5 LAEs and 9/14 (64%) of the z=5.7 LAEs are detected at
>3-sigma in at least one IRAC band. Individual z=4.5 IRAC-detected LAEs have a
large range of stellar mass, from 5x10^8 to 10^11 Msol. One-third of the
IRAC-detected LAEs have older stellar population ages of 100 Myr - 1 Gyr, while
the remainder have ages < 100 Myr. A stacking analysis of IRAC-undetected LAEs
shows this population to be primarily low mass (8 -- 20 x 10^8 Msol) and young
(64 - 570 Myr). We find a correlation between stellar mass and the
dust-corrected ultraviolet-based star-formation rate (SFR) similar to that at
lower redshifts, in that higher mass galaxies exhibit higher SFRs. However, the
z=4.5 LAE correlation is elevated 4-5 times in SFR compared to
continuum-selected galaxies at similar redshifts. The exception is the most
massive LAEs which have SFRs similar to galaxies at lower redshifts suggesting
that they may represent a different population of galaxies than the traditional
lower-mass LAEs, perhaps with a different mechanism promoting Lyman alpha
photon escape. | Source: | arXiv, 1509.6381 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |