Searching for Star Formation beyond Reionization

Barton, Elizabeth J.; Davé, Romeel; Smith, John‐David T.; Papovich, Casey; Hernquist, Lars; Springel, Volker

doi:10.1086/383489

Cited by 62 publications

(80 citation statements)

References 40 publications

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“…Third is that only a fraction f IGM of Lyα photons penetrates the IGM and reaches us (e.g. Barton et al 2004), although this effect is only significant before reionization (z 6). This can be summarized as follows: F Lyα,obs = f Lyα F Lyα,em = e −τ dust (1 − f esc ) f IGM F Lyα,em , where f Lyα characterizes the net escape fraction of Lyα photons from LAEs.…”

Section: Galaxy Lf At Z = 6 and Cosmic Star Formation Historymentioning

confidence: 99%

Tracing early structure formation with massive starburst galaxies and their implications for reionization

Nagamine¹,

Cen²,

Furlanetto³

et al. 2006

New Astronomy Reviews

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Cosmological hydrodynamic simulations have significantly improved over the past several years, and we have already shown that the observed properties of Lymanbreak galaxies (LBGs) at z = 3 can be explained well by the massive galaxies in the simulations. Here we extend our study to z = 6 and show that we obtain good agreement for the LBGs at the bright-end of the luminosity function (LF). Our simulations also suggest that the cosmic star formation rate density has a peak at z = 5−6, and that the current LBG surveys at z = 6 are missing a significant number of faint galaxies that are dimmer than the current magnitude limit. Together, our results suggest that the universe could be reionized at z = 6 by the Pop II stars in ordinary galaxies.We also estimate the LF of Lyman-α emitters (LAEs) at z = 6 by relating the star formation rate in the simulation to the Lyα luminosity. We find that the simulated LAE LFs agree with the observed data provided that the net escape fraction of Lyα photon is f Lyα ≤ 0.1. We investigate two possible scenarios for this effect:(1) all sources in the simulation are uniformly dimmer by a factor of 10 through attenuation, and (2) one out of ten LAEs randomly lights up at a given moment. We show that the correlation strength of the LAE spatial distribution can possibly distinguish the two scenarios.

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Section: Galaxy Lf At Z = 6 and Cosmic Star Formation Historymentioning

confidence: 99%

Tracing early structure formation with massive starburst galaxies and their implications for reionization

Nagamine¹,

Cen²,

Furlanetto³

et al. 2006

New Astronomy Reviews

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“…Most importantly, regardless of the technique, we predict large H ii regions whose detection should be more straightforward, whether through quasar absorption spectra (Miralda-Escudé et al 2000;Barkana 2002), Ly lines at extremely high-redshifts (Pelló et al 2004;Loeb et al 2004;Ricotti et al 2004;Gnedin & Prada 2004;Cen et al 2004;Barton et al 2004), or 21 cm tomography. For example, the noise in a 21 cm map is proportional to the square root of the bandwidth and, more important, to the square of the pixel size.…”

Section: Discussionmentioning

confidence: 82%

Untitled

2004

ApJ

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Recently, there has been a great deal of interest in understanding the reionization of hydrogen in the intergalactic medium (IGM). One of the major outstanding questions is how this event proceeds on large scales. Motivated by numerical simulations, we develop a model for the growth of H ii regions during the reionization era. We associate ionized regions with large-scale density fluctuations and use the excursion set formalism to model the resulting size distribution. We then consider ways in which to characterize the morphology of ionized regions. We show how to construct the power spectrum of fluctuations in the neutral hydrogen field. The power spectrum contains definite features from the H ii regions that should be observable with the next generation of low-frequency radio telescopes through surveys of redshifted 21 cm emission from the reionization era. Finally, we also consider statistical descriptions beyond the power spectrum and show that our model of reionization qualitatively changes the distribution of neutral gas in the IGM. Subject headingg s: cosmology: theory -diffuse radiation -H ii regions -intergalactic medium

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“…The typical expected fluxes for these lines in our models range between 10 −17 and a few 10 −18 erg/s/cm2. Thus, a reasonable S/N∼ 3 − 5 could be obtained with a mid-resolution near-IR spectrograph such as ISAAC/VLT, with exposure times of the order of a few hours (see also simulations by Barton et al 2003). The detection of both HeII λ1640 and Lyman-α should allow to constrain the upper end of the IMF and the age of these systems.…”

Section: Expected Properties Of Galaxies At Zmentioning

confidence: 91%

Very High-Redshift Lensed Galaxies

Pelló¹,

Richard²,

Borgne³

et al. 2004

Proc. IAU

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Abstract. We review in this paper the main results recently obtained on the identification and study of very high-z galaxies using lensing clusters as natural gravitational telescopes. We present in detail our pilot survey with ISAAC/VLT, aimed at the detection of z> 7 sources. Evolutionary synthesis models for extremely metal-poor and PopIII starbursts have been used to derive the observational properties expected for these high-z galaxies, such as expected magnitudes and colors, line fluxes for the main emission lines, etc. These models have allowed to define fairly robust selection criteria to find z∼ 7 − 10 galaxies based on broad-band near-IR photometry in combination with the traditional Lyman drop-out technique. The first results issued from our photometric and spectroscopic survey are discussed, in particular the preliminary confirmation rate, and the global properties of our high-z candidates, including the latest results on the possible z=10.0 candidate A1835-1916. The search efficiency should be significantly improved by the future near-IR multi-object ground-based and space facilities. However, strong lensing clusters remain a factor of ∼ 5 − 10 more efficient than blank fields in the z ∼ 7 − 11 domain, within the FOV of a few arcminutes around the cluster core, for the typical depth required for this survey project.

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Searching for Star Formation beyond Reionization

Cited by 62 publications

References 40 publications

Tracing early structure formation with massive starburst galaxies and their implications for reionization

Tracing early structure formation with massive starburst galaxies and their implications for reionization

Untitled

Very High-Redshift Lensed Galaxies

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