|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
RELICS: Spectroscopy of gravitationally-lensed $zsimeq 2$ reionization-era analogs and implications for CIII] detections at $z>6$ | | Ramesh Mainali
; Daniel P Stark
; Mengtao Tang
; Jacopo Chevallard
; Stéphane Charlot
; Keren Sharon
; Dan Coe
; Brett Salmon
; Larry D. Bradley
; Traci L. Johnson
; Brenda Frye
; Roberto J. Avila
; Sara Ogaz
; Adi Zitrin
; Maruša Bradač
; Brian C. Lemaux
; Guillaume Mahler
; Rachel Paterno-Mahler
; Victoria Strait
; Felipe Andrade-Santos
; | | Date: |
19 Sep 2019 | | Abstract: | Recent observations have revealed the presence of strong CIII] emission
(EW$_{
m{CIII]}}>20$
{A}) in $z>6$ galaxies, the origin of which remains
unclear. In an effort to understand the nature of these line emitters, we have
initiated a survey targeting CIII] emission in gravitationally-lensed
reionization era analogs identified in HST imaging of clusters from the RELICS
survey. Here we report initial results on four galaxies selected to have low
stellar masses (2-8$ imes$10$^7$ M$_odot$) and J$_{125}$-band flux excesses
indicative of intense [OIII]+H$eta$ emission
(EW$_{
m{[OIII]+Heta}}$=500-2000
{A}), similar to what has been observed
at $z>6$. We detect CIII] emission in three of the four sources, with the CIII]
EW reaching values seen in the reionization era (EW$_{
m{CIII]}}simeq 17-22$
{A}) in the two sources with the strongest optical line emission
(EW$_{
m{[OIII]+Heta}}simeq 2000$
{A}). We have obtained a Magellan/FIRE
near-infrared spectrum of the strongest CIII] emitter in our sample, revealing
gas that is both metal poor and highly ionized. Using photoionization models,
we are able to simultaneously reproduce the intense CIII] and optical line
emission for extremely young (2-3 Myr) and metal poor (0.06-0.08 Z$_odot$)
stellar populations, as would be expected after a substantial upturn in the SFR
of a low mass galaxy. The sources in this survey are among the first for which
CIII] has been used as the primary means of redshift confirmation. We suggest
that it should be possible to extend this approach to $z>6$ with current
facilities, using CIII] to measure redshifts of objects with IRAC excesses
indicating EW$_{
m{[OIII]+Heta}}simeq 2000$
{A}, providing a method of
spectroscopic confirmation independent of Ly$alpha$. | | Source: | arXiv, 1909.9212 | | 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:
| |
REGISTER