scholarly journals MUSE observations towards the lensing cluster A2744: Intersection between the LBG and LAE populations at z ∼ 3–7

2020 ◽  
Vol 644 ◽  
pp. A39
Author(s):  
G. de La Vieuville ◽  
R. Pelló ◽  
J. Richard ◽  
G. Mahler ◽  
L. Lévêque ◽  
...  
Keyword(s):  
Total Population ◽  
Relative Distribution ◽  
Star Forming ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Break Galaxies ◽  
Opposite Trend ◽  
Three Samples ◽  
Lyman Alpha Emitters ◽  
Two Populations

We present a study of the intersection between the populations of star forming galaxies selected as either Lyman break galaxies (LBGs) or Lyman-alpha emitters (LAEs) in the redshift range 2.9 − 6.7 and within the same volume of universe sampled by the Multi-Unit Spectroscopic Explorer (MUSE) behind the Hubble Frontier Fields lensing cluster A2744. We define three samples of star-forming galaxies: LBG galaxies with an LAE counterpart (92 galaxies), LBG galaxies without an LAE counterpart (408 galaxies), and LAE galaxies without an LBG counterpart (46 galaxies). All these galaxies are intrinsically faint because of the lensing nature of the sample (M1500 ≥ −20.5). The fraction of LAEs among all selected star-forming galaxies increases with redshift up to z ∼ 6 and decreases for higher redshifts, in agreement with previous findings. The evolution of LAE/LBG populations with UV magnitude and Lyα luminosity shows that the LAE selection is able to identify intrinsically UV faint galaxies with M1500 ≥ −15 that are typically missed in the deepest lensing photometric surveys. The LBG population seems to fairly represent the total population of star-forming galaxies down to M1500 ∼ −15. Galaxies with M1500 < −17 tend to have SFRLyα < SFRuv, whereas the opposite trend is observed within our sample for faint galaxies with M1500 > −17, including galaxies only detected by their Lyα emission, with a large scatter. These trends, previously observed in other samples of star-forming galaxies at high-z, are seen here for very faint M1500 ∼ −15 galaxies; that is, much fainter than in previous studies. The present results show no clear evidence for an intrinsic difference between the properties of the two populations selected as LBG and/or LAE. The observed trends could be explained by a combination of several phenomena, like the existence of different star-formation regimes, the dust content, the relative distribution and morphology of dust and stars, or the stellar populations.

scholarly journals Clustering of galaxies around quasars at z ∼ 4

2019 ◽  
Vol 15 (S352) ◽  
pp. 171-173
Author(s):  
Cristina García-Vergara ◽  
Joseph F. Hennawi ◽  
L. Felipe Barrientos ◽  
Fabrizio Arrigoni Battaia
Keyword(s):  
Dark Matter ◽  
Correlation Function ◽  
Cross Correlation ◽  
Dark Matter Halos ◽  
Lyman Alpha ◽  
Alpha Emitters ◽  
Lyman Break Galaxies ◽  
Auto Correlation ◽  
Auto Correlation Function ◽  
Lyman Alpha Emitters

AbstractWe conduct a survey for Lyman break galaxies (LBGs) and Lyman alpha emitters (LAEs) in the environs of six and 17 z ∼ 4 quasars respectively, probing scales of R≲9h−1Mpc. We detect an enhancement of galaxies (both LBGs and LAEs) in quasar fields, a positive and strong quasar-galaxy cross-correlation function, consistent with a power-law shape, and a strong galaxy auto-correlation function in quasar fields. The three mentioned results are all indicators that quasars trace massive dark matter halos in the early universe.

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 The VANDELS survey: a strong correlation between Ly α equivalent width and stellar metallicity at 3 ≤ z ≤ 5

2020 ◽  
Vol 495 (1) ◽  
pp. 1501-1510 ◽  
Author(s):  
F Cullen ◽  
R J McLure ◽  
J S Dunlop ◽  
A C Carnall ◽  
D J McLeod ◽  
...  
Keyword(s):  
Equivalent Width ◽  
Rest Frame ◽  
Star Forming ◽  
Lyman Alpha ◽  
Spectral Fitting ◽  
Best Fitting ◽  
Lyman Alpha Emitters ◽  
Galaxy Population ◽  
Far Ultraviolet ◽  
The Relationship

ABSTRACT We present the results of a new study investigating the relationship between observed Ly α equivalent width (Wλ(Ly α)) and the metallicity of the ionizing stellar population ( Z⋆) for a sample of 768 star-forming galaxies at 3 ≤ z ≤ 5 drawn from the VANDELS survey. Dividing our sample into quartiles of rest-frame Wλ(Ly α) across the range $-58 \,\rm {\mathring{\rm A}} \lesssim$Wλ(Ly α) $\lesssim 110 \,\rm {\mathring{\rm A}}$, we determine  Z⋆ from full spectral fitting of composite far-ultraviolet spectra and find a clear anticorrelation between Wλ(Ly α) and  Z⋆. Our results indicate that  Z⋆ decreases by a factor ≳ 3 between the lowest Wλ(Ly α) quartile (〈Wλ(Ly α)$\rangle =-18\,\rm {\mathring{\rm A}}$) and the highest Wλ(Ly α) quartile (〈Wλ(Ly α)$\rangle =24\,\rm {\mathring{\rm A}}$). Similarly, galaxies typically defined as Lyman alpha emitters (LAEs; Wλ(Ly α) $\gt 20\,\rm {\mathring{\rm A}}$) are, on average, metal poor with respect to the non-LAE galaxy population (Wλ(Ly α) $\le 20\,\rm {\mathring{\rm A}}$) with  Z⋆non-LAE ≳ 2 ×  Z⋆LAE. Finally, based on the best-fitting stellar models, we estimate that the increasing strength of the stellar ionizing spectrum towards lower  Z⋆ is responsible for ${\simeq}15{-}25{{\ \rm per\ cent}}$ of the observed variation in Wλ(Ly α) across our sample, with the remaining contribution (${\simeq}75{-}85{{\ \rm per\ cent}}$) being due to a decrease in the H i/dust covering fractions in low- Z⋆ galaxies.

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.

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