An Overdensity of Galaxies at<i>z</i>= 5.9 + 0.2 in the Hubble Ultra Deep Field Confirmed Using the ACS Grism

Malhotra, Sangeeta; Rhoads, James E.; Pirzkal, Nor; Haiman, Zoltán; Xu, Chun; Daddi, E.; Yan, Hao; Bergeron, Louis; Wang, J.; Ferguson, Henry C.; Grönwall, C.; Koekemoer, Anton M.; Kuemmel, M.; Moustakas, Leonidas A.; Panagia, N.; Pasquali, A.; Stiavelli, M.; Walsh, J. R.; Windhorst, Rogier A.; Alighieri, S. di Serego

doi:10.1086/430047

Cited by 133 publications

(129 citation statements)

References 48 publications

(64 reference statements)

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“…Spectra of galaxies in the GOODS-South field were obtained by several different observational campaigns: the two most extended ones were conducted by ESO with FORS2 (Vanzella et al 2006(Vanzella et al , 2008(Vanzella et al , 2009) and VIMOS (Popesso et al 2009). Other redshifts were obtained with the VLT by GMASS (Kurk et al 2009), by the HST/ACS/G880L grism survey PEARS (Straughn et al 2008) and the similar GRAPES project (Pirzkal et al 2004;Malhotra et al 2005). In total there are 130 U-dropout galaxies with confirmed redshift.…”

Section: The Samplementioning

confidence: 99%

Physical and morphological properties ofz~ 3 Lyman break galaxies: dependence on Lyαline emission

Pentericci¹,

Grazian²,

Scarlata

et al. 2010

A&A

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Aims. We investigate the physical and morphological properties of Lyman break galaxies (LBGs) at redshift ∼2.5 to ∼3.5, to determine if and how they depend on the nature and strength of the Lyα emission. Methods. We selected U-dropout galaxies from the z-detected GOODS-MUSIC catalog by adapting the classical Lyman break criteria on the GOODS filter set. We kept only those galaxies with spectroscopic confirmation, mainly from VIMOS and FORS public observations. Using the full multi-wavelength 14-bands information (U to IRAC), we determined the physical properties of the galaxies through a standard spectral energy distribution fitting procedure with the updated Charlot & Bruzual (2009) templates. We also added other relevant observations of the GOODS field, i.e. the 24 μm observations from Spitzer/MIPS and the 2 MSec Chandra X-ray observations. Finally, using non parametric diagnostics (Gini, Concentration, Asymmetry, M 20 and ellipticity), we characterized the rest-frame UV morphologies of the galaxies. We then analyzed how these physical and morphological properties correlate with the presence of the Lyα emission line in the optical spectra. Results. We find that unlike at higher redshift, the dependence of physical properties on the Lyα line is milder: galaxies without Lyα in emission tend to be more massive and dustier than the rest of the sample, but all other parameters, ages, star formation rates (SFR), X-ray emission and UV morphology do not depend strongly on the presence of the Lyα emission. A simple scenario where all LBGs have intrinsically high Lyα emission, but where the dust and neutral hydrogen content (which shapes the final appearance of the Lyα) depend on the mass of the galaxies, is able to reproduce the majority of the observed properties at z ∼ 3. Some modification might be needed to account for the observed evolution of these properties with cosmic epoch, which is also discussed.

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Section: The Samplementioning

confidence: 99%

Physical and morphological properties ofz~ 3 Lyman break galaxies: dependence on Lyαline emission

Pentericci¹,

Grazian²,

Scarlata

et al. 2010

A&A

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“…In its initial 2005 HUDF campaign, the Hubble Advanced Camera for Surveys (ACS) used four optical filters to identify galaxies with redshifts up to 7.5, showing that the galaxy number density further declines with redshift (e.g. Malhotra et al 2005;Bouwens et al 2007;Oesch et al 2007).…”

Section: Eor Galaxy Observationsmentioning

confidence: 99%

First light: exploring the spectra of high-redshift galaxies in the Renaissance Simulations

Barrow

Wise

Norman

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present synthetic observations for the first generations of galaxies in the Universe and make predictions for future deep field observations for redshifts greater than 6. Due to the strong impact of nebular emission lines and the relatively compact scale of H ii regions, high resolution cosmological simulations and a robust suite of analysis tools are required to properly simulate spectra. We created a software pipeline consisting of FSPS, Hyperion, Cloudy and our own tools to generate synthetic IR observations from a fully three-dimensional arrangement of gas, dust, and stars. Our prescription allows us to include emission lines for a complete chemical network and tackle the effect of dust extinction and scattering in the various lines of sight. We provide spectra, 2-D binned photon imagery for both HST and JWST IR filters, luminosity relationships, and emission line strengths for a large sample of high redshift galaxies in the Renaissance Simulations. Our resulting synthetic spectra show high variability between galactic halos with a strong dependence on stellar mass, metallicity, gas mass fraction, and formation history. haloes with the lowest stellar mass have the greatest variability in [O iii]/Hβ, [O iii] and C iii] while haloes with higher masses are seen to show consistency in their spectra and [O iii] equivalent widths (EW) between 1Å and 10Å. Viewing angle accounted for three-fold difference in flux due to the presence of ionized gas channels in a halo. Furthermore, JWST colour plots show a discernible relationship between redshift, colour, and mean stellar age.

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“…As seen from this equation, even a neutral hydrogen fraction as low as 10 −5 can lead to a significant attenuation of Lyα photons at high-z , making them extremely sensitive probes of H I in the IGM. As a result, a class of high-z galaxies called Lyman Alpha Emitters (LAEs), detected by means of their Lyα line (at 1216Å in the rest frame), have become popular probes of reionization, with statistically significant samples available in the reionization epoch, at z 5.7 and 6.6 (Malhotra et al 2005;Taniguchi et al 2005;Shimasaku et al 2006;Hu et al 2010;Kashikawa et al 2006;Ouchi et al 2010;Kashikawa et al 2011). Indeed, a number of theoretical papers have used semi-analytic (e.g.…”

Section: Introductionmentioning

confidence: 99%

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

Hutter

Dayal

Müller

2015

Monthly Notices of the Royal Astronomical Society

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We calculate Lyman Alpha Emitter (LAE) angular correlation functions (ACFs) at z 6.6 and the fraction of lifetime (for the 100 Myrs preceding z 6.6) galaxies spend as Lyman Break Galaxies (LBGs) or as LBGs with Lyman Alpha (Lyα) emission using a model that combines SPH cosmological simulations (GADGET-2), dust attenuation and a radiative transfer code (pCRASH). The ACFs are a powerful tool that significantly narrows the 3D parameter space allowed by LAE Lyα and UV luminosity functions (LFs) alone. With this work, we simultaneously constrain the escape fraction of ionizing photons f esc = 0.05 − 0.5, the mean fraction of neutral hydrogen in the intergalactic medium (IGM) χ HI < ∼ 0.01 and the dust-dependent ratio of the escape fractions of Lyα and UV continuum photons f α /f c = 0.6 − 1.2. Our results show that reionization has the largest impact on the amplitude of the ACFs, and its imprints are clearly distinguishable from those of f esc and f α /f c . We also show that galaxies with a critical stellar mass of M * = 10 8.5 (10 9.5 )M produce enough luminosity to stay visible as LBGs (LAEs). Finally, the fraction of time during the past 100 Myrs prior to z = 6.6 a galaxy spends as a LBG or as a LBG with Lyα emission increases with the UV magnitude (and the stellar mass M * ): considering observed (dust and IGM attenuated) luminosities, the fraction of time a galaxy spends as a LBG (LAE) increases from 65% to 100% ( 0 − 100%) as M U V decreases from M U V = −18.0 to −23.5 (M * increases from 10 8 − 10 10.5 M ). Thus in our model the brightest (most massive) LBGs most often show Lyα emission.

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An Overdensity of Galaxies atz= 5.9 + 0.2 in the Hubble Ultra Deep Field Confirmed Using the ACS Grism

Cited by 133 publications

References 48 publications

Physical and morphological properties ofz~ 3 Lyman break galaxies: dependence on Lyαline emission

Physical and morphological properties ofz~ 3 Lyman break galaxies: dependence on Lyαline emission

First light: exploring the spectra of high-redshift galaxies in the Renaissance Simulations

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

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