scholarly journals Clustering and lifetime of Lyman Alpha Emitters in the Epoch of Reionization

2015 ◽  
Vol 450 (4) ◽  
pp. 4025-4034 ◽  
Author(s):  
Anne Hutter ◽  
Pratika Dayal ◽  
Volker Müller
Keyword(s):  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Alpha Emitters

scholarly journals Detecting Lyman alpha emitters in the submillimetre

2010 ◽  
Vol 403 (2) ◽  
pp. 620-624 ◽  
Author(s):  
Pratika Dayal ◽  
Hiroyuki Hirashita ◽  
Andrea Ferrara
Keyword(s):  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Alpha Emitters

scholarly journals A Subaru Search for Lyman$\alpha$ Emitters atz= 5.8 with an Intermediate-Band Filter

2004 ◽  
Vol 56 (4) ◽  
pp. 597-603 ◽  
Author(s):  
Masaru Ajiki ◽  
Yoshiaki Taniguchi ◽  
Shinobu S. Fujita ◽  
Yasuhiro Shioya ◽  
Tohru Nagao ◽  
...  
Keyword(s):  
Intermediate Band ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Band Filter ◽  
Lyman Alpha Emitters

scholarly journals Upper limits on the escape fraction of ionizing radiation from galaxies at 2 ≲ z < 6

2021 ◽  
Author(s):  
U Meštrić ◽  
E V Ryan-Weber ◽  
J Cooke ◽  
R Bassett ◽  
L J Prichard ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Equivalent Width ◽  
Density Ratio ◽  
Groups Of Galaxies ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Upper Limit ◽  
Lyman Continuum ◽  
Upper Limits ◽  
Lyman Alpha Emitters

Abstract In this work, we investigate upper limits on the global escape fraction of ionizing photons ($f_{\rm esc/global}^{\rm abs}$) from a sample of galaxies probed for Lyman-continuum (LyC) emission characterized as non-LyC and LyC leakers. We present a sample of 9 clean non-contaminated (by low redshift interlopers, CCD problems and internal reflections of the instrument) galaxies which do not show significant (&gt; 3σ) LyC flux between 880Å &lt;λrest &lt; 910Å. The 9 galaxy stacked spectrum reveals no significant LyC flux with an upper limit of $f_{\rm esc}^{\rm abs} \le 0.06$. In the next step of our analysis, we join all estimates of $f_{\rm esc}^{\rm abs}$ upper limits derived from different samples of 2 ≲ z &lt; 6 galaxies from the literature reported in last ∼20 years and include the sample presented in this work. We find the $f_{\rm esc}^{\rm abs}$ upper limit ≤ 0.084 for the galaxies recognized as non-LyC leakers. After including all known detections from literature $f_{\rm esc/global}^{\rm abs}$ upper limit ≤ 0.088 for all galaxies examined for LyC flux. Furthermore, $f_{\rm esc}^{\rm abs}$ upper limits for different groups of galaxies indicate that the strongest LyC emitters could be galaxies classified as Lyman alpha emitters. We also discuss the possible existence of a correlation among the observed flux density ratio $(F_{\nu }^{LyC}/F_{\nu }^{UV})_{\rm obs}$ and Lyman alpha equivalent width EW(Lyα), where we confirm the existence of moderately significant correlation among galaxies classified as non-LyC leakers.

scholarly journals The MUSE-Wide survey: Three-dimensional clustering analysis of Lyman-alpha emitters at 3.3 < z < 6

2021 ◽  
Author(s):  
Y. Herrero Alonso ◽  
M. Krumpe ◽  
L. Wisotzki ◽  
T. Miyaji ◽  
T. Garel ◽  
...  
Keyword(s):  
Clustering Analysis ◽  
Three Dimensional ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Alpha Emitters

scholarly journals Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys

2020 ◽  
Author(s):  
Dijana Vrbanec ◽  
Benedetta Ciardi ◽  
Vibor Jelić ◽  
Hannes Jensen ◽  
Ilian T Iliev ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Wide Field ◽  
Galaxy Surveys ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Cross Correlations ◽  
Square Kilometer Array ◽  
Lyman Alpha Emitters ◽  
Infrared Survey ◽  
Cross Power Spectrum

Abstract In this paper we use radiative transfer + N-body simulations to explore the feasibility of measurements of cross-correlations between the 21 cm field observed by the Square Kilometer Array (SKA) and high-z Lyman Alpha Emitters (LAEs) detected in galaxy surveys with the Subaru Hyper Supreme Cam (HSC), Subaru Prime Focus Spectrograph (PFS) and Wide Field Infrared Survey Telescope (WFIRST). 21cm-LAE cross-correlations are in fact a powerful probe of the epoch of reionization as they are expected to provide precious information on the progress of reionization and the typical scale of ionized regions at different redshifts. The next generation observations with SKA will have a noise level much lower than those with its precursor radio facilities, introducing a significant improvement in the measurement of the cross-correlations. We find that an SKA-HSC/PFS observation will allow to investigate scales below ∼10 h−1 Mpc and ∼60 h−1 Mpc at z = 7.3 and 6.6, respectively. WFIRST will allow to access also higher redshifts, as it is expected to observe spectroscopically ∼900 LAEs per square degree and unit redshift in the range 7.5 ≤ z ≤ 8.5. Because of the reduction of the shot noise compared to HSC and PFS, observations with WFIRST will result in more precise cross-correlations and increased observable scales.

scholarly journals Superwind Galaxies at High Redshift: the Case of LAE J1044-0130

2004 ◽  
Vol 217 ◽  
pp. 300-301
Author(s):  
Masaru Ajiki ◽  
Shinobu S. Fujita ◽  
Yasuhiro Shioya ◽  
Tohru Nagao ◽  
Takashi Murayama ◽  
...  
Keyword(s):  
Emission Line ◽  
Line Width ◽  
Line Profile ◽  
High Redshift ◽  
Broad Line ◽  
Large Sample ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Alpha Emitters ◽  
Emission Line Profile

Superwind galaxies at high-redshift are now considered to be the important clue for understanding the interaction and evolution of both galaxies and intergalactic matter. In order to improve our knowledge of superwind galaxies at high redshift, a large sample of superwind candidates is needed. During the course of our new search for Lyman alpha emitters at z = 5.7, we have found a candidate superwind galaxy, LAE J1044-0130, at z = 5.69. The emission-line profile of this object is asymmetric, showing excess red-wing emission and the observed broad line width (= 340 km/s). In this poster, we report detailed observed properties of LAE J1044-0130 as an example of a superwind galaxy.

scholarly journals The mean ultraviolet spectrum of a representative sample of faint z ∼ 3 Lyman alpha emitters

2018 ◽  
Vol 477 (2) ◽  
pp. 2098-2111 ◽  
Author(s):  
Kimihiko Nakajima ◽  
Thomas Fletcher ◽  
Richard S Ellis ◽  
Brant E Robertson ◽  
Ikuru Iwata
Keyword(s):  
Representative Sample ◽  
Ultraviolet Spectrum ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
The Mean ◽  
Lyman Alpha Emitters

scholarly journals Distinguishing AGN from starbursts as the origin of double-peaked Lyman-alpha emitters in the reionization era

2021 ◽  
Vol 646 ◽  
pp. L10
Author(s):  
Hamsa Padmanabhan ◽  
Abraham Loeb
Keyword(s):  
Active Galactic Nuclei ◽  
Peak Velocity ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Radio Observations ◽  
Space Telescope ◽  
X Ray ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Alpha Emitters

We discuss the possible origin of the double-peaked profiles recently observed in Lyman-alpha emitters (LAEs) at the epoch of reionization (z  ≳  6.5) from obscured active galactic nuclei (AGN). In combining the extent of the Lyman-α near-zones estimated from the blue peak velocity offset in these galaxies, with the ionizing emissivity of quasars at z ≳ 6, we forecast the intrinsic UV and X-ray luminosities of the AGN needed to give rise to their double-peaked profiles. We also estimate the extent of the obscuration of the AGN by comparing their luminosities to those of similar quasar samples at these epochs. Future X-ray and radio observations, as well as those with the James Webb Space Telescope, will be valuable tools to test the AGN contribution to the intergalactic-scale ionization zones of high-redshift LAEs.

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