We present the first estimate of the Ly α luminosity function using blind spectroscopy from the Multi Unit Spectroscopic Explorer, MUSE, in the Hubble Deep Field-South. Using automatic source-detection software, we assemble a homogeneously detected sample of 59 Ly α emitters covering a flux range of -18.0 < log10 (F) < -16.3 (erg s-1 cm-2), corresponding to luminosities of 41.4 < log10 (L) < 42.8 (erg s-1). As recent studies have shown, Ly α fluxes can be underestimated by a factor of 2 or more via traditional methods, and so we undertake a careful assessment of each object's Ly α flux using a curve-of-growth analysis to account for extended emission. We describe our self-consistent method for determining the completeness of the sample, and present an estimate of the global Ly α luminosity function between redshifts 2.91 < z < 6.64 using the 1/Vmax estimator. We find that the luminosity function is higher than many number densities reported in the literature by a factor of 2-3, although our result is consistent at the 1σ level with most of these studies. Our observed luminosity function is also in good agreement with predictions from semi-analytic models, and shows no evidence for strong evolution between the high- and low-redshift halves of the data. We demonstrate that one's approach to Ly α flux estimation does alter the observed luminosity function, and caution that accurate flux assessments will be crucial in measurements of the faint-end slope. This is a pilot study for the Ly αLy α luminosity function in the MUSE deep-fields, to be built on with data from the Hubble Ultra Deep Field that will increase the size of our sample by almost a factor of 10.

Drake, A., Guiderdoni, B., Blaizot, J., Wisotzki, L., Herenz, E., Garel, T., et al. (2017). MUSE deep-fields: The Ly α luminosity function in the Hubble Deep Field-South at 2.91 < z < 6.64. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 471(1), 267-278 [10.1093/mnras/stx1515].

MUSE deep-fields: The Ly α luminosity function in the Hubble Deep Field-South at 2.91 < z < 6.64

Cantalupo S.;
2017

Abstract

We present the first estimate of the Ly α luminosity function using blind spectroscopy from the Multi Unit Spectroscopic Explorer, MUSE, in the Hubble Deep Field-South. Using automatic source-detection software, we assemble a homogeneously detected sample of 59 Ly α emitters covering a flux range of -18.0 < log10 (F) < -16.3 (erg s-1 cm-2), corresponding to luminosities of 41.4 < log10 (L) < 42.8 (erg s-1). As recent studies have shown, Ly α fluxes can be underestimated by a factor of 2 or more via traditional methods, and so we undertake a careful assessment of each object's Ly α flux using a curve-of-growth analysis to account for extended emission. We describe our self-consistent method for determining the completeness of the sample, and present an estimate of the global Ly α luminosity function between redshifts 2.91 < z < 6.64 using the 1/Vmax estimator. We find that the luminosity function is higher than many number densities reported in the literature by a factor of 2-3, although our result is consistent at the 1σ level with most of these studies. Our observed luminosity function is also in good agreement with predictions from semi-analytic models, and shows no evidence for strong evolution between the high- and low-redshift halves of the data. We demonstrate that one's approach to Ly α flux estimation does alter the observed luminosity function, and caution that accurate flux assessments will be crucial in measurements of the faint-end slope. This is a pilot study for the Ly αLy α luminosity function in the MUSE deep-fields, to be built on with data from the Hubble Ultra Deep Field that will increase the size of our sample by almost a factor of 10.
Articolo in rivista - Articolo scientifico
Cosmology: observations; Galaxies: evolution; Galaxies: formation; Galaxies: high-redshift; Galaxies: luminosity functions, mass function; Surveys;
English
267
278
12
Drake, A., Guiderdoni, B., Blaizot, J., Wisotzki, L., Herenz, E., Garel, T., et al. (2017). MUSE deep-fields: The Ly α luminosity function in the Hubble Deep Field-South at 2.91 < z < 6.64. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 471(1), 267-278 [10.1093/mnras/stx1515].
Drake, A; Guiderdoni, B; Blaizot, J; Wisotzki, L; Herenz, E; Garel, T; Richard, J; Bacon, R; Bina, D; Cantalupo, S; Contini, T; den Brok, M; Hashimoto, T; Marino, R; Pello, R; Schaye, J; Schmidt, K
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/372587
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