The influence of environment on the composition of sweet corn, 1905- 1908

Church, C. G.; Straughn, Martin Norris

doi:10.5962/bhl.title.33284

Cited by 2 publications

(2 citation statements)

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“…Erb et al 2006a,b) Furthermore, deep slit‐less surveys using the Wide Field Camera 3 (WFC3) on Hubble Space Telescope ( HST ) and narrow‐band filters at Subaru have revealed substantial numbers of H ii galaxies with large equivalent widths (i.e. strong emission lines and weak continua) at intermediate and high redshifts (Yamada et al 2005; Kazaku, Cowie & Hu 2007; Atek et al 2010; Nestor et al 2011; Straughn et al 2011; Xia et al 2011). In all, the present sample has more than 400 H ii galaxies covering the redshift range 0.5 < z < 3.7 with about 100 in the range 3.0 < z < 3.7 and about 150 at z ∼ 2.…”

Section: Cosmological Parameters From the Hubble Relationmentioning

confidence: 99%

A strategy to measure the dark energy equation of state using the H ii galaxy Hubble function and X-ray active galactic nuclei clustering: preliminary results

Plionis

Terlevich

Basilakos

et al. 2011

Monthly Notices of the Royal Astronomical Society

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We explore the possibility of setting stringent constraints to the dark energy equation of state using alternative cosmic tracers like (a) the Hubble relation using H ii galaxies, which can be observed at much higher redshifts (z≲ 3.5) than those currently traced by Type Ia supernovae (SNeIa) samples, and (b) the large‐scale structure using the clustering of X‐ray selected active galactic nuclei (AGN), which have a redshift distribution peaking at z∼ 1. In this paper we use extensive Monte Carlo simulations to define the optimal strategy for the recovery of the dark energy equation of state using the high‐redshift (z≳ 2) Hubble relation, but accounting also for the effects of gravitational lensing, which for such high redshifts can significantly affect the derived cosmological constraints. We investigate the size of the sample of high‐z H ii galaxies needed to provide useful constraints in the dark energy equation of state. Based on a ‘figure of merit’ analysis, we provide estimates for the number of 2 ≲z≲ 3.5 tracers needed to reduce the cosmological solution space, presently provided by the Constitution SNIa set, by a desired factor. The analysis is given for any level of rms distance modulus uncertainty and we find that an expected reduction (i.e. by ∼20–40 per cent) of the current level of H ii‐galaxy‐based distance modulus uncertainty does not provide a significant improvement in the derived cosmological constraints. It is much more efficient to increase the number of tracers than to reduce their individual uncertainties. Finally, we propose a framework to put constraints on the dark energy equation of state by using the joint likelihood of the X‐ray AGN clustering and of the Hubble relation cosmological analyses. A preliminary joint analysis using the X‐ray AGN clustering of the 2XMM survey and the Hubble relation of the Constitution SNIa set provide Ωm= 0.31 ± 0.01 and w=−1.06 ± 0.05. We also find that the joint SNIa–2XMM analysis provides significantly more stringent cosmological constraints, increasing the figure of merit by a factor of ∼2, with respect to that of the joint SNIa–baryonic acoustic oscillation analysis.

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Section: Cosmological Parameters From the Hubble Relationmentioning

confidence: 99%

A strategy to measure the dark energy equation of state using the H ii galaxy Hubble function and X-ray active galactic nuclei clustering: preliminary results

Plionis

Terlevich

Basilakos

et al. 2011

Monthly Notices of the Royal Astronomical Society

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“…With spectra of every Lyman break galaxy in the Hubble Ultra Deep Field, we can examine the statistics of Lyman-α emission from galaxies in our sample. We have previously published lists of emission line objects in the field Straughn et al 2008) and a more specific study of the Lyman-α galaxies, focussing on their ages, masses, and morphologies (Pirzkal et al 2007;hereafter P07).…”

Section: Lyman-α Emission Propertiesmentioning

confidence: 99%

Spectroscopic Confirmation of Faint Lyman Break Galaxies Near Redshift Five in the Hubble Ultra Deep Field

Rhoads

Malhotra

Pirzkal

et al. 2009

ApJ

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and the PEARS team ABSTRACTWe present the faintest spectroscopically confirmed sample of z ∼ 5 Lyman break galaxies to date. The sample is based on slitless grism spectra of the Hubble Ultra Deep Field region from the GRAPES (Grism ACS Program for Extragalactic Science) and PEARS (Probing Evolution and Reionization Spectroscopically) projects, using the G800L grism on the HST Advanced Camera for Surveys. We report here confirmations of 39 galaxies, pre-selected as candidate Lyman break galaxies using photometric selection criteria. We compare a "traditional" V-dropout selection to a more liberal one (with V −i > 0.9), and find that the traditional criteria are about 64% complete and 81% reliable. We also study the Lyman-α emission properties of our sample. We find that Lyman-α emission is detected in ∼ 1/4 of the sample, and that our broad-band color selected sample includes ∼ 55% of previously published line-selected Lyman-α sources. Finally, we examine our stacked 2D spectra. We demonstrate that strong, spatially extended (∼ 1 ′′ ) Lyman-α emission is not a generic property of these Lyman break galaxies, but that a modest extension of the Lyman-α photosphere (compared to the starlight) may be present in those galaxies with prominent Lyman-α emission.

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The influence of environment on the composition of sweet corn, 1905- 1908

Cited by 2 publications

References 0 publications

A strategy to measure the dark energy equation of state using the H ii galaxy Hubble function and X-ray active galactic nuclei clustering: preliminary results

A strategy to measure the dark energy equation of state using the H ii galaxy Hubble function and X-ray active galactic nuclei clustering: preliminary results

Spectroscopic Confirmation of Faint Lyman Break Galaxies Near Redshift Five in the Hubble Ultra Deep Field

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