|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Star formation law at z=2.5 inferred from the electron density of ionized gas | | Rhythm Shimakawa
; Tadayuki Kodama
; Charles C. Steidel
; Ken-ichi Tadaki
; Ichi Tanaka
; Allison L. Strom
; Masao Hayashi
; Yusei Koyama
; Tomoko L. Suzuki
; Moegi Yamamoto
; | | Date: |
5 Nov 2014 | | Abstract: | In the redshift interval $z=2-3$, the physical conditions of the
inter-stellar medium (ISM) in star-forming galaxies are likely to be different
from those in the local Universe because of lower gaseous metallicities and
higher gas fractions, and observations suggest higher electron densities,
higher ionization parameters, and harder UV radiation fields may be common.
In this Letter, based on the spectra of H$alpha$-selected star-forming
galaxies at $z$=2.5 taken with the Multi-Object Spectrometer for InfraRed
Exploration (MOSFIRE) on the Keck-1 telescope, we measure electron densities
($n_e$) using the oxygen line ratio ([OII]$lambdalambda$3726,3729), and
investigate the relationships between the electron density of ionized gas and
other physical properties. As a result, we find for the first time that the
specific star formation rate (sSFR) and the surface density of SFR
($Sigma_mathrm{SFR}$) are correlated with the electron density at $z$=2.5.
The $Sigma_mathrm{SFR}-n_e$ relation is likely to be linked to the global
star formation law (Kennicutt-Schmidt law) where star formation activity is
regulated by gas density. Moreover, we discuss the mode and geometry of star
formation in those galaxies, based on the correlation between sSFR and
$Sigma_mathrm{SFR}$. Highly star-forming galaxies (with high sSFR) tend to be
characterized by compact dense regions with high values of both $n_e$ and
$Sigma_mathrm{SFR}$. | | Source: | arXiv, 1411.1408 | | 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 claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER