AN ATLAS OF z = 5.7 AND z = 6.5 Lyα EMITTERS,

By E. Hu, L. Cowie, A. Barger, P. Capak, Y. Kakazu, Laura Trouille. 2010

163 citations recorded by the source corpus.

We present an atlas of 88 z ∼ 5.7 and 30 z ∼ 6.5 Lyα emitters obtained from a wide-field narrowband survey. We combined deep narrowband imaging in 120 Å bandpass filters centered at 8150 Å and 9140 Å with deep BVRIz broadband imaging to select high-redshift galaxy candidates over an area of 4180 arcmin2. The goal was to obtain a uniform selection of comparable depth over the seven targeted fields in the two filters. For the GOODS-North region of the Hubble Deep Field-North field, we also selected candidates using a 120 Å filter centered at 9210 Å. We made spectroscopic observations with Keck DEIMOS of nearly all the candidates to obtain the final sample of Lyα emitters. At the 3.3 Å resolution of the DEIMOS observations the asymmetric profile for Lyα emission can be clearly seen in the spectra of nearly all the galaxies. We show that the spectral profiles are surprisingly similar for many of the galaxies and that the composite spectral profiles are nearly identical at z = 5.7 and z = 6.5. We analyze the distributions of line widths and Lyα equivalent widths and find that the lines are marginally narrower at the higher redshift, with median values of 0.77 Å at z = 6.5 and 0.92 Å at z = 5.7. The line widths have a dependence on the Lyα luminosity of the form ∼L0.3α. We compare the surface densities and the luminosity functions at the two redshifts and find that there is a multiplicative factor of two decrease in the number density of bright Lyα emitters from z = 5.7 to z = 6.5, while the characteristic luminosity is unchanged.

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/79ec71edf4a1072918ee1effb18648fe5b12550b

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Citations in the corpus

Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ∼2000 Lyα emitters at z = 6–7 over the 0.3–0.5 Gpc2 survey area (2017, background): “…to z ∼ 7 including the evolution of Lyα luminosity functions (LFs; Malhotra & Rhoads 2004; Kashikawa et al. 2006, 2011; Deharveng et al. 2008; Ouchi et al. 2008, 2010; Cowie et al. 2010; Hu et al. 2010; Konno et al. 2014; Matthee et al. 2015; Santos et al. 2016; Ota et al. 2017; Zheng et al. 2017).”
SILVERRUSH. IV. Lyα luminosity functions at z = 5.7 and 6.6 studied with ∼1300 Lyα emitters on the 14–21 deg2 sky (2017, result): “The wide area of the HSC SSP survey allows us to probe this brighter luminosity range than those of previous studies (e.g., Shimasaku et al. 2006; Ouchi et al. 2008; Hu et al. 2010).”
EVIDENCE FOR PopIII-LIKE STELLAR POPULATIONS IN THE MOST LUMINOUS Lyα EMITTERS AT THE EPOCH OF REIONIZATION: SPECTROSCOPIC CONFIRMATION (2015, background): “Narrow-band searches have been successful in detecting and confirming Lyα emitters at z ∼ 3 − 7 (e.g. Cowie & Hu 1998; Malhotra & Rhoads 2004; Iye et al. 2006; Murayama et al. 2007; Hu et al. 2010; Ouchi et al. 2010).”
COMPLETING THE CENSUS OF Lyα EMITTERS AT THE REIONIZATION EPOCH (2011, methodology): “The trend was also indirectly suggested from a possible FWHM difference in lines seen by Hu et al. (2010), for which it was difficult to derive EW0 due to the shallow photometric data.”
CANDELS: THE CONTRIBUTION OF THE OBSERVED GALAXY POPULATION TO COSMIC REIONIZATION (2012, background): “A similar decrease in the Lyα luminosity function has been measured fromz= 5.7 toz = 6.6 (e.g., Ouchi et al. 2010; Hu et al. 2010), though see also Malhotra & Rhoads (2004).”
Identification of the brightest Lyα emitters at z = 6.6 : Implications for the evolution of the luminosity function in the reionization era (2015, background): “As noted by Kashikawa et al. (2011), the difference between the results from Hu et al. (2010) and the others is due to incompleteness of the sample of Hu et al. (2010), since they rely on spectroscopic follow-up with too short integration times.”
NEW OBSERVATIONS OF z ∼ 7 GALAXIES: EVIDENCE FOR A PATCHY REIONIZATION (2014, background): “…study the IGM temperature in quasar nearzones and find that reionization must have been completed by z > 6.5 at high confidence, while several teams (Hu et al. (2010), Kashikawa et al. (2011) and Ouchi et al. 2010) study the Lyα line shapes of LAEs at z = 6.5 finding no evidence of damping wings.”
Lyα EMISSION FROM GREEN PEAS: THE ROLE OF CIRCUMGALACTIC GAS DENSITY, COVERING, AND KINEMATICS (2015, background): “…of this selection, Lyα luminosities in low-redshift samples—when measured—are around an order of magnitude lower than the luminosities of most Lyα-selected galaxies observed at z > 3 (Gronwall et al. 2007; Hu et al. 2010; Ouchi et al. 2010; Dressler et al. 2011, 2015; Henry et al. 2012).”
SPECTROSCOPIC CONFIRMATION OF TWO LYMAN BREAK GALAXIES AT REDSHIFT BEYOND 7 (2010, background): “These include narrowband selected Lyα emitters (LAEs) (Ota et al. 2010; Ouchi et al. 2010; Hu et al. 2010), and color-selected Lyman break galaxies (LBGs) from wide and deep surveys carried out in the near-IR, mainly with WFC3 (Bouwens et al. 2010a; McLure et al. 2010) and HawkI (Castellano et al.…”
Using Lyman-α to detect galaxies that leak Lyman continuum (2014, background): “On the other hand, a huge amount of spectroscopic data are available in Lyα, up to the reionisation redshift (e.g. Shapley et al. 2003; Hu et al. 2010; Stark et al. 2010; Guaita et al. 2010, 2011; Dressler et al. 2011; Bielby et al. 2011; Pentericci et al. 2010, 2011; Kulas et al. 2012; Jiang et…”