A Luminous Lyα‐emitting Galaxy at Redshift<i>z</i>= 6.535: Discovery and Spectroscopic Confirmation

Rhoads, James E.; Xu, Chun; Dawson, Steve; Dey, Arjun; Malhotra, Sangeeta; Wang, Junxian; Jannuzi, Buell T.; Spinrad, Hyron; Stern, Daniel

doi:10.1086/422094

Cited by 103 publications

(133 citation statements)

References 44 publications

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“…the large sample of Lyα emitters at z ∼ 5.7 by Hu et al (2004), the z = 6.17 and 6.53 galaxies found respectively by Cuby et al (2003) and Rhoads et al (2004), the two z ∼ 6.6 galaxies detected by Kodaira et al (2003), and the galaxy at a redshift z = 6.96 found by Iye et al (2006). In the latter case, which should be representative of z ∼ 7 samples, the authors used a combination of NB imaging at 8150 Å (SuprimeCam) and broad-band photometry in the optical bands to select candidates for a subsequent spectroscopic follow up with DEIMOS/Keck.…”

Section: Lyman Break Versus Nb Searchesmentioning

confidence: 79%

Looking for the first galaxies: lensing or blank fields?

Maizy

Richard²,

Leo³

et al. 2009

A&A

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Context. The identification and study of the first galaxies remains one of the most exciting topics in observational cosmology. The determination of the best possible observing strategies is a very important choice in order to build up a representative sample of spectroscopically confirmed sources at high-z (z > ∼ 7), beyond the limits of present-day observations. Aims. This paper is intended to precisely adress the relative efficiency of lensing and blank fields in the identification and study of galaxies at 6 < ∼ z < ∼ 12.Methods. The detection efficiency and field-to-field variance are estimated from direct simulations of both blank and lensing fields observations. Present known luminosity functions in the UV are used to determine the expected distribution and properties of distant samples at z > ∼ 6 for a variety of survey configurations. Different models for well known lensing clusters are used to simulate in details the magnification and dilution effects on the backgound distant population of galaxies. Results. The presence of a strong-lensing cluster along the line of sight has a dramatic effect on the number of observed sources, with a positive magnification bias in typical ground-based "shallow" surveys (AB < ∼ 25.5). The positive magnification bias increases with the redshift of sources and decreases with both depth of the survey and the size of the surveyed area. The maximum efficiency is reached for lensing clusters at z ∼ 0.1−0.3. Observing blank fields in shallow surveys is particularly inefficient as compared to lensing fields if the UV LF for LBGs is strongly evolving at z > ∼ 7. Also in this case, the number of z ≥ 8 sources expected at the typical depth of JWST (AB ∼ 28−29) is much higher in lensing than in blank fields (e.g. a factor of ∼10 for AB < ∼ 28). All these results have been obtained assuming that number counts derived in clusters are not dominated by sources below the limiting surface brightness of observations, which in turn depends on the reliability of the usual scalings applied to the size of high-z sources. Conclusions. Blank field surveys with a large field of view are needed to prove the bright end of the LF at z > ∼ 6−7, whereas lensing clusters are particularly useful for exploring the mid to faint end of the LF.

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Section: Lyman Break Versus Nb Searchesmentioning

confidence: 79%

Looking for the first galaxies: lensing or blank fields?

Maizy

Richard²,

Leo³

et al. 2009

A&A

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show abstract

“…Thanks to large telescopes such as Subaru, VLTs, and Keck, a few dozen galaxies at 6 < z < 7 have been spectroscopically confirmed so far (Hu et al 2002;Kodaira et al 2003;Cuby et al 2003;Rhoads et al 2004;Kurk et al 2004;Nagao et al 2004Nagao et al , 2005aTaniguchi et al 2005;Stern et al 2005;Kashikawa et al 2006). Statistical properties of these high-z galaxies, such as their luminosity function and their correlation function provide information on galaxy evolution, the cosmic star-formation rate, and the re-ionization history of the universe.…”

Section: Introductionmentioning

confidence: 98%

High-redshift Ly$\mathsf{\alpha}$ emitters with a large equivalent width

Nagao

Murayama

Maiolino

et al. 2007

A&A

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We report new follow-up spectroscopy of i -dropout galaxies with an NB921-band depression found in the Subaru Deep Field. The NB921-depressed i -dropout selection method is expected to select galaxies with large equivalent-width Lyα emission over a wide redshift range, 6.0 < ∼ z < ∼ 6.5. Two of four observed targets show a strong emission line with a clear asymmetric profile, identified as Lyα emitters at z = 6.11 and 6.00. Their rest-frame equivalent widths are 153 Å and 114 Å, which are lower limits on the intrinsic equivalent widths. Through our spectroscopic observations (including previous ones) of NB921-depressed i -dropout galaxies, we identified 5 galaxies in total with a rest-frame equivalent width larger than 100 Å at 6.0 < ∼ z < ∼ 6.5 out of 8 photometric candidates, which suggests that the NB921-depressed i -dropout selection method is possibly an efficient way to search for Lyα emitters with a large Lyα equivalent width, in a wider redshift range than with usual narrow-band excess techniques. By combining these findings with our previous observational results, we infer that the fraction of broad-band selected galaxies having a rest-frame equivalent width larger than 100 Å is significantly higher at z ∼ 6 (the cosmic age of ∼1 Gyr) than that at z ∼ 3 (∼2 Gyr), being consistent with the idea that the typical stellar population of galaxies is significantly younger at z ∼ 6 than that at z ∼ 3. The NB921-depressed i -dropout galaxies may be interesting candidates for hosts of massive, zero-metallicity Population III stars.

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“…Thanks in large part to the availability of large-format mosaic CCDs well suited for wide-field imaging and spectroscopic multiplexing, we are now transitioning from exotic, single detections of high-redshift galaxies (e.g., Dey et al 1998;Weymann et al 1998;Ellis et al 2001;Ajiki et al 2002;Dawson et al 2002;Hu et al 2002;Cuby et al 2003;Taniguchi et al 2003;Nagao et al 2004;Rhoads et al 2004;Stern et al 2005) to the assembly of statistically robust samples spanning the earliest accessible redshifts. Robust samples of this kind are necessary for understanding the systematics of selection criteria and of the spatial distribution of the galaxies themselves.…”

Section: Introductionmentioning

confidence: 99%

A Luminosity Function of Lyα‐emitting Galaxies atz≈ 4.5

Dawson

Rhoads

Malhotra

et al. 2007

ApJ

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119

157

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We present a catalog of 59 z % 4:5 Ly -emitting galaxies spectroscopically confirmed in a campaign of Keck DEIMOS follow-up observations to candidates selected in the Large Area Ly (LALA) narrowband imaging survey. We targeted 97 candidates for spectroscopic follow-up; by accounting for the variety of conditions under which we performed spectroscopy, we estimate a selection reliability of $76%. Together with our previous sample of Keck LRIS confirmations, the 59 sources confirmed herein bring the total catalog to 73 spectroscopically confirmed z % 4:5 Lyemitting galaxies in the %0.7 deg 2 covered by the LALA imaging. As with the Keck LRIS sample, we find that a nonnegligible fraction of the confirmed Ly lines have rest-frame equivalent widths (W rest k ) that exceed the maximum predicted for normal stellar populations: 17%Y31% (93% confidence) of the detected galaxies show W rest k > 190 8, and 12%Y27% (90% confidence) show W rest k > 240 8. We construct a luminosity function of z % 4:5 Ly emission lines for comparison to Ly luminosity functions spanning 3:1 < z < 6:6. We find no significant evidence for Ly luminosity function evolution from z % 3 to z % 6. This result supports the conclusion that the intergalactic medium remains largely reionized from the local universe out to z % 6:5. It is somewhat at odds with the pronounced drop in the cosmic star formation rate density recently measured between z $ 3 and z $ 6 in continuum-selected Lyman-break galaxies, and therefore potentially sheds light on the relationship between the two populations.

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A Luminous Lyα‐emitting Galaxy at Redshiftz= 6.535: Discovery and Spectroscopic Confirmation

Cited by 103 publications

References 44 publications

Looking for the first galaxies: lensing or blank fields?

Looking for the first galaxies: lensing or blank fields?

High-redshift Ly$\mathsf{\alpha}$ emitters with a large equivalent width

A Luminosity Function of Lyα‐emitting Galaxies atz≈ 4.5

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