scholarly journals OMEGA – OSIRIS Mapping of Emission-line Galaxies in A901/2 – I. Survey description, data analysis, and star formation and AGN activity in the highest density regions

2015 ◽  
Vol 450 (4) ◽  
pp. 4458-4474 ◽  
Author(s):  
Ana L. Chies-Santos ◽  
Bruno Rodríguez del Pino ◽  
Alfonso Aragón-Salamanca ◽  
Steven P. Bamford ◽  
Meghan E. Gray ◽  
...  
Keyword(s):  
Data Analysis ◽  
Star Formation ◽  
Emission Line ◽  
Emission Line Galaxies

scholarly journals Low Metallicity Galaxies at z ~ 0.7: Keys to the Origins of Metallicity Scaling Laws

2008 ◽  
Vol 4 (S255) ◽  
pp. 397-401
Author(s):  
David J. Rosario ◽  
Carlos Hoyos ◽  
David Koo ◽  
Andrew Phillips
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Galaxy Evolution ◽  
Scaling Laws ◽  
Temperature Sensitive ◽  
Star Forming ◽  
Low Metallicity ◽  
Emission Line Galaxies ◽  
Halo Masses ◽  
Stellar Masses

AbstractWe present a study of remarkably luminous and unique dwarf galaxies at redshifts of 0.5 < z < 0.7, selected from the DEEP2 Galaxy Redshift survey by the presence of the temperature sensitive [OIII]λ4363 emission line. Measurements of this important auroral line, as well as other strong oxygen lines, allow us to estimate the integrated oxygen abundances of these galaxies accurately without being subject to the degeneracy inherent in the standard R23 system used by most studies. [O/H] estimates range between 1/5–1/10 of the solar value. Not surprisingly, these systems are exceedingly rare and hence represent a population that is not typically present in local surveys such as SDSS, or smaller volume deep surveys such as GOODS.Our low-metallicity galaxies exhibit many unprecedented characteristics. With B-band luminosities close to L*, thse dwarfs lie significantly away from the luminosity-metallicity relationships of both local and intermediate redshift star-forming galaxies. Using stellar masses determined from optical and NIR photometry, we show that they also deviate strongly from corresponding mass-metallicity relationships. Their specific star formation rates are high, implying a significant burst of recent star formation. A campaign of high resolution spectroscopic follow-up shows that our galaxies have dynamical properties similar to local HII and compact emission line galaxies, but mass-to-light ratios that are much higher than average star-forming dwarfs.The low metallicities, high specific star formation rates, and small halo masses of our galaxies mark them as lower redshift analogs of Lyman-Break galaxies, which, at z ~ 2 are evolving onto the metallicity sequence that we observe in the galaxy population of today. In this sense, these systems offer fundamental insights into the physical processes and regulatory mechanisms that drive galaxy evolution in that epoch of major star formation and stellar mass assembly.

scholarly journals Study of a Complete Sample of Hα Emission–Line Galaxies from the UCM Survey

1996 ◽  
Vol 171 ◽  
pp. 380-380 ◽  
Author(s):  
J. Gallego ◽  
J. Zamorano ◽  
M. Rego ◽  
A.G. Vitores ◽  
O. Alonso
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Energy Output ◽  
University Of Michigan ◽  
Complete Sample ◽  
Star Forming ◽  
The Galaxy ◽  
Hα Emission ◽  
Emission Line Galaxies ◽  
Galaxy Population

The Universidad Complutense de Madrid survey is a long-term project with the aim of finding and analyzing star forming galaxies using the Hα line as the tracer for star formation processes. In order to obtain a representative and complete sample of the population detected, spectroscopic observations were carried out for the full sample of Hα emission-line galaxy (ELG) candidates of the UCM lists 1 and 2. The ELGs types most commonly found (47%) are intermediate to low-luminosity objects with a very intense star-formation region which dominates the optical energy output of the galaxy. This kind of ELGs is similar to the galaxy population detected in the blue objective-prism surveys. And what is more important, a second population (43%) of star-forming galaxies with low ionization or high extinction properties has been found. This ELGs group is detected neither in the blue (University of Michigan survey, Case survey) nor in other surveys (Kiso, IRAS, Markarian) using other selection techniques.

scholarly journals A CANDELS WFC3 GRISM STUDY OF EMISSION-LINE GALAXIES ATz∼ 2: A MIX OF NUCLEAR ACTIVITY AND LOW-METALLICITY STAR FORMATION

2011 ◽  
Vol 743 (2) ◽  
pp. 144 ◽  
Author(s):  
Jonathan R. Trump ◽  
Benjamin J. Weiner ◽  
Claudia Scarlata ◽  
Dale D. Kocevski ◽  
Eric F. Bell ◽  
...  
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Nuclear Activity ◽  
Low Metallicity ◽  
Emission Line Galaxies

scholarly journals Metal Abundances and Star Formation Rates of Emission-line Galaxies in and around the Boötes Void

2019 ◽  
Vol 883 (1) ◽  
pp. 29 ◽  
Author(s):  
Gary A. Wegner ◽  
John J. Salzer ◽  
Joanna M. Taylor ◽  
Alec S. Hirschauer
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Metal Abundances ◽  
Emission Line Galaxies

scholarly journals OMEGA – OSIRIS Mapping of Emission-line Galaxies in A901/2: II. – Environmental influence on integrated star formation properties and AGN activity

2017 ◽  
pp. stx228 ◽  
Author(s):  
Bruno Rodríguez del Pino ◽  
Alfonso Aragón-Salamanca ◽  
Ana L. Chies-Santos ◽  
Tim Weinzirl ◽  
Steven P. Bamford ◽  
...  
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Environmental Influence ◽  
Emission Line Galaxies

scholarly journals Star formation rates and chemical abundances of emission-line galaxies in intermediate-redshift clusters

2006 ◽  
Vol 368 (4) ◽  
pp. 1871-1879 ◽  
Author(s):  
M. Mouhcine ◽  
S. P. Bamford ◽  
A. Aragon-Salamanca ◽  
O. Nakamura ◽  
B. Milvang-Jensen
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Chemical Abundances ◽  
Emission Line Galaxies ◽  
Intermediate Redshift

scholarly journals Wolf-Rayet Stars Featured in Emission-Line Galaxies

1982 ◽  
Vol 99 ◽  
pp. 569-570
Author(s):  
D. Kunth
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
H Ii Regions ◽  
Hot Stars ◽  
Active Star ◽  
Direct Emission ◽  
Emission Line Galaxies

Emission-line galaxies contain a large number of hot stars responsible for the emissive gas. They offer the opportunity of investigating the initial mass function of stars in regions of active star formation. So far, only integral properties of the ionizing complexes in giant H II regions or emission-line galaxies have been used (Lequeux et al., 1981) but no direct emission-line stellar feature has been thoroughly analyzed.

scholarly journals A large, deep 3 deg2 survey of H α, [O iii], and [O ii] emitters from LAGER: constraining luminosity functions

2020 ◽  
Vol 493 (3) ◽  
pp. 3966-3984 ◽  
Author(s):  
A A Khostovan ◽  
S Malhotra ◽  
J E Rhoads ◽  
C Jiang ◽  
J Wang ◽  
...  
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Rest Frame ◽  
Formation Rate ◽  
Photometric Redshifts ◽  
Lyman Alpha ◽  
Star Formation Activity ◽  
Luminosity Functions ◽  
Emission Line Galaxies ◽  
Dust Attenuation

ABSTRACT We present our measurements of the H α, [O iii], and [O ii] luminosity functions as part of the Lyman Alpha Galaxies at Epoch of Reionization (LAGER) survey using our samples of 1577 z = 0.47 H α-, 3933 z = 0.93 [O iii]-, and 5367 z = 1.59 [O ii]-selected emission line galaxies in a 3 deg2 single, CTIO/Blanco DECam pointing of the COSMOS field. Our observations reach 5σ depths of 8.2 × 10−18 erg s−1 cm−2 and comoving volumes of (1−7) × 105 Mpc3 making our survey one of the deepest narrow-band surveys. We select our emission line galaxies via spectroscopic confirmation, photometric redshifts, and colour–colour selections. We measure the observed luminosity functions for each sample and find best fits of $\phi ^\star = 10^{-3.16^{+0.09}_{-0.09}}$ Mpc−3 and $L^\star = 10^{41.72^{+0.09}_{-0.09}}$ erg s−1 for H α, $\phi ^\star = 10^{-2.16^{+0.10}_{-0.12}}$ Mpc−3 and $L^\star = 10^{41.38^{+0.07}_{-0.06}}$ erg s−1 for [O iii], and $\phi ^\star = 10^{-1.97^{+0.07}_{-0.07}}$ Mpc−3 and $L^\star = 10^{41.66^{+0.03}_{-0.03}}$ erg s−1 for [O ii], with α fixed to −1.75, −1.6, and −1.3, respectively. An excess of bright &gt;1042 erg s−1 [O iii] emitters is observed and may be due to active galactic nucleus (AGN) contamination. Corrections for dust attenuation are applied assuming AHα = 1 mag. We also design our own empirical rest-frame g − r calibration using SDSS DR12 data, test it against our z = 0.47 H α emitters with zCOSMOS 1D spectra, and calibrate it for (g − r) between −0.8 and 1.3 mag. Dust and AGN-corrected star formation rate densities (SFRDs) are measured as log10ρSFR/(M⊙ yr−1 Mpc−3) = −1.63 ± 0.04, −1.07 ± 0.06, and −0.90 ± 0.10 for H α, [O iii], and [O ii], respectively. We find our [O iii] and [O ii] samples fully trace cosmic star formation activity at their respective redshifts in comparison to multiwavelength SFRDs, while the H α sample traces ∼70 per cent of the total z = 0.47 SFRD.

scholarly journals Star Formation in Emission‐Line Galaxies between Redshifts of 0.8 and 1.6

2002 ◽  
Vol 581 (1) ◽  
pp. 205-222 ◽  
Author(s):  
Erin K. S. Hicks ◽  
Matthew A. Malkan ◽  
Harry I. Teplitz ◽  
Patrick J. McCarthy ◽  
Lin Yan
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Emission Line Galaxies
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