Detection of Lyman-α-emitting galaxies at redshift 4.55

Hu, E. M.; McMahon, R. G.

doi:10.1038/382231a0

Cited by 129 publications

(106 citation statements)

References 29 publications

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“…The sensitive narrowband imaging observations have succeeded to detect a large number of the Lyα emitters at intermediate and high redshift toward z ∼ 7 (e.g., Hu & McMahon 1996;Steidel et al 2000;Rhoads & Malhotra 2001;Rhoads et al 2003;Kodaira et al 2003;Palunas et al 2004;Hayashino et al 2004;Matsuda et al 2004Matsuda et al , 2010Matsuda et al , 2011Taniguchi et al 2005;Gronwall et al 2007;Iye et al 2006;Ouchi et al 2008Ouchi et al , 2010.…”

Section: Introductionmentioning

confidence: 99%

PANORAMIC SURVEY OF Lyα EMITTERS ATz= 3.1

Yamada

Nakamura

Matsuda

et al. 2012

The Astronomical Journal

156

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We present the results of the extensive narrowband survey of Lyα emission-line objects at z = 3.1 in the 1.38 deg 2 area surrounding the high-density region of star-forming galaxies at z = 3.09 in the SSA22 field, as well as in the 1.04 deg 2 area of the three separated general blank fields. In total, of 2161 Lyα emitters, there are 1394 in the SSA22 fields and 767 in the general fields detected at the narrowband AB magnitude limit of 25.73, which corresponds to the line flux of ≈1.8 × 10 −17 erg s −1 cm −2 or the luminosity of ≈1.5 × 10 42 erg s −1 at z = 3.1, above the observed equivalent-width threshold, ≈190 Å. The average surface number density of the emitters at z = 3.1 in the general fields above the thresholds is 0.20 ± 0.01 arcmin −2 . The SSA22 high-density region at z = 3.09, whose peak local density is six times that of the average, is found to be the most prominent outstanding structure in the whole surveyed area and is firmly identified as a robust "protocluster." We also compared the overdensity of the 100 arcmin 2 and 700 arcmin 2 areas which contain the protocluster with the expected fluctuation of the dark matter as well as those of the model galaxies in cosmological simulations. We found that the peak height values of the overdensity are 8-10 and 3-4 times the expected standard deviations for the counts of Lyα emitters at z = 3.1 in the corresponding volume, respectively. We conclude that the structure at z = 3.09 in the SSA22 field is a very significant and rare density peak up to the scale of ≈60 Mpc.

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Section: Introductionmentioning

confidence: 99%

PANORAMIC SURVEY OF Lyα EMITTERS ATz= 3.1

Yamada

Nakamura

Matsuda

et al. 2012

The Astronomical Journal

156

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“…If faint, low mass galaxies have strong Lyα emission, they can be relatively easily selected by narrow-band imaging with a filter tuned to the wavelength of Lyα at a redshift of interest (e.g., Hu & McMahon 1996). Galaxies with a wide range of masses may be strong Lyα-emitters (LAEs), but the average galaxy selected as an LAE is fainter in the continuum and lower in mass than typical galaxies selected via their continuum light in magnitude-limited surveys (Kornei et al 2010).…”

Section: Introductionmentioning

confidence: 99%

THE Lyα PROPERTIES OF FAINT GALAXIES ATz∼ 2-3 WITH SYSTEMIC REDSHIFTS AND VELOCITY DISPERSIONS FROM KECK-MOSFIRE

Erb

Steidel

Trainor

et al. 2014

ApJ

197

236

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We study the Lyα profiles of 36 spectroscopically detected Lyα-emitters (LAEs) at z ∼ 2-3, using Keck MOSFIRE to measure systemic redshifts and velocity dispersions from rest-frame optical nebular emission lines. The sample has a median optical magnitude R = 26.0, and ranges from R 23 to R > 27, corresponding to rest-frame UV absolute magnitudes M UV −22 to M UV > −18.2. Dynamical masses range from M dyn < 1.3 × 10 8 M to M dyn = 6.8 × 10 9 M , with a median value of M dyn = 6.3 × 10 8 M . Thirty of the 36 Lyα emission lines are redshifted with respect to the systemic velocity with at least 1σ significance, and the velocity offset with respect to systemic Δv Lyα is correlated with the R-band magnitude, M UV , and the velocity dispersion measured from nebular emission lines with >3σ significance: brighter galaxies with larger velocity dispersions tend to have larger values of Δv Lyα . We also make use of a comparison sample of 122 UV-color-selected R < 25.5 galaxies at z ∼ 2, all with Lyα emission and systemic redshifts measured from nebular emission lines. Using the combined LAE and comparison samples for a total of 158 individual galaxies, we find that Δv Lyα is anti-correlated with the Lyα equivalent width with 7σ significance. Our results are consistent with a scenario in which the Lyα profile is determined primarily by the properties of the gas near the systemic redshift; in such a scenario, the opacity to Lyα photons in lower mass galaxies may be reduced if large gaseous disks have not yet developed and if the gas is ionized by the harder spectrum of young, low metallicity stars.

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“…The study of the high-redshift universe and the early evolution of galaxies has primarily relied on two techniques to obtain large samples of high-redshift galaxies, the Lyman break technique (LBGs; Steidel et al 1999;Ouchi et al 2004;Bouwens & Illingworth 2006, and references therein) and narrowband surveys targeting Lyα emitting galaxies (LAEs; Hu & McMahon 1996;Rhoads & Malhotra 2001;Ajiki et al 2003;Hu et al 2004Hu et al , 2010Taniguchi et al 2005;Murayama et al 2007;Gronwall et al 2007;Ouchi et al 2008, and references therein). Studying the difference in the nature and properties of the two populations, selected by these two techniques, helps to understand early stages of galaxy formation and provides constraints on reionization.…”

Section: Introductionmentioning

confidence: 99%

Lyα EMISSION FROM HIGH-REDSHIFT SOURCES IN COSMOS

Mallery

Mobasher

Capak

et al. 2012

ApJ

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We investigate spectroscopically measured Lyα equivalent widths (EWs) and escape fractions of 244 sources of which 95 are Lyman break galaxies (LBGs) and 106 Lyman alpha emitters (LAEs) at z ∼ 4.2, z ∼ 4.8, and z ∼ 5.6 selected from intermediate and narrowband observations. The sources were selected from the Cosmic Evolution Survey and observed with the DEIMOS spectrograph. We find that the distribution of EWs shows no evolution with redshift for both the LBG selected sources and the intermediate/narrowband LAEs. We also find that the Lyα escape fraction of intermediate/narrowband LAEs is on average higher and has a larger variation than the escape fraction of LBG selected sources. The escape fraction does not show a dependence with redshift. Similar to what has been found for LAEs at low redshifts, the sources with the highest extinctions show the lowest escape fractions. The range of escape fractions increases with decreasing extinction. This is evidence that the dust extinction is the most important factor affecting the escape of Lyα photons, but at low extinctions other factors, such as the H i covering fraction and gas kinematics, can be just as effective at inhibiting the escape of Lyα photons.

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Detection of Lyman-α-emitting galaxies at redshift 4.55

Cited by 129 publications

References 29 publications

PANORAMIC SURVEY OF Lyα EMITTERS ATz= 3.1

PANORAMIC SURVEY OF Lyα EMITTERS ATz= 3.1

THE Lyα PROPERTIES OF FAINT GALAXIES ATz∼ 2-3 WITH SYSTEMIC REDSHIFTS AND VELOCITY DISPERSIONS FROM KECK-MOSFIRE

Lyα EMISSION FROM HIGH-REDSHIFT SOURCES IN COSMOS

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