SIMBAD references

2015ApJ...800...18A - Astrophys. J., 800, 18 (2015/February-2)

New constraints on the faint end of the UV luminosity function at z ∼ 7-8 using the gravitational lensing of the Hubble frontier fields cluster A2744.

ATEK H., RICHARD J., KNEIB J.-P., JAUZAC M., SCHAERER D., CLEMENT B., LIMOUSIN M., JULLO E., NATARAJAN P., EGAMI E. and EBELING H.

Abstract (from CDS):

Exploiting the power of gravitational lensing, the Hubble Frontier Fields (HFF) program aims at observing six massive galaxy clusters to explore the distant universe far beyond the limits of blank field surveys. Using the complete Hubble Space Telescope observations of the first HFF cluster A2744, we report the detection of 50 galaxy candidates at z ∼ 7 and eight candidates at z ∼ 8 in a total survey area of 0.96 arcmin2 in the source plane. Three of these galaxies are multiply imaged by the lensing cluster. Using an updated model of the mass distribution in the cluster we were able to calculate the magnification factor and the effective survey volume for each galaxy in order to compute the ultraviolet galaxy luminosity function (LF) at both redshifts 7 and 8. Our new measurements reliably extend the z ∼ 7 UV LF down to an absolute magnitude of MUV∼ -15.5. We find a characteristic magnitude of MUV* = -20.90–0.73+0.90 mag and a faint-end slope α = -2.01–0.28+0.20, close to previous determinations in blank fields. We show here for the first time that this slope remains steep down to very faint luminosities of 0.01 L {sstarf}. Although prone to large uncertainties, our results at z ∼ 8 also seem to confirm a steep faint-end slope below 0.1 L {sstarf}. The HFF program is therefore providing an extremely efficient way to study the faintest galaxy populations at z > 7 that would otherwise be inaccessible with current instrumentation. The full sample of six galaxy clusters will provide even better constraints on the buildup of galaxies at early epochs and their contribution to cosmic reionization.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - galaxies: luminosity function, mass function - gravitational lensing: strong

VizieR on-line data: <Available at CDS (J/ApJ/800/18): table3.dat table4.dat>

Nomenclature: Tables 3-4: [ARK2015] NNNN N=50+8 among (Nos 260-6670). Table 5: [ARK2015] N.N (Nos 1.1-1.3, 2.1-2.2, 5.1-5.4).

Status at CDS:  

Simbad objects: 64

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2015ApJ...800...18A and select 'bookmark this link' or equivalent in the popup menu


2020.04.01-01:48:47

© Université de Strasbourg/CNRS

    • Contact