|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'585
Articles rated: 2609
24 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
LBT/LUCIFER Observations of the z~2 Lensed Galaxy J0900+2234 | | Fuyan Bian
; Xiaohui Fan
; Jill Bechtold
; Ian D. McGreer
; Dennis W. Just
; David J. Sand
; Richard F. Green
; David Thompson
; Chien Y. Peng
; Walter Seifert
; Nancy Ageorges
; Marcus Juette
; Volker Knierim
; Peter Buschkamp
; | | Date: |
25 Apr 2010 | | Abstract: | We present rest-frame optical images and spectra of the gravitationally
lensed, star-forming galaxy J0900+2234 (z=2.03). The observations were
performed with the newly commissioned LUCIFER1 near-infrared instrument mounted
on the Large Binocular Telescope (LBT). We fit lens models to the rest-frame
optical images and find the galaxy has an intrinsic effective radius of 7.4 kpc
with a lens magnification factor of about 5 for the A and B components. We also
discovered a new arc belonging to another lensed high-z source galaxy, which
makes this lens system a potential double Einstein ring system. Using the high
S/N rest-frame spectra covering H+K band, we detected Hbeta, OIII, Halpha, NII
and SII emission lines. Detailed physical properties of this high-z galaxy were
derived. The extinction towards the ionized HII regions (E_g(B-V)) is computed
from the flux ratio of Halpha and Hbeta and appears to be much higher than that
towards stellar continuum (E_s(B-V)), derived from the optical and NIR broad
band photometry fitting. The metallicity was estimated using N2 and O3N2
indices. It is in the range of 1/5-1/3 solar abundance, which is much lower
than the typical z~2 star-forming galaxies. From the flux ratio of SII 6717 and
6732, we found that the electron number density of the HII regions in the
high-z galaxy were >1000 cm^-3, consistent with other z~2 galaxies but much
higher than that in local HII regions. The star-formation rate was estimated
via the Halpha luminosity, after correction for the lens magnification, to be
about 116pm16 Msun/yr. Combining the FWHM of Halpha emission lines and the
half-light radius, we found the dynamical mass of the lensed galaxy is
7.2x10^10 Msun. | | Source: | arXiv, 1004.4318 | | 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