CLUES to the past: Local Group progenitors amongst high-redshift Lyman Break Galaxies

Abstract

We use state-of-the-art numerical simulations to explore the observability and the expected physical properties of the progenitors of the local group galaxies at z=6-8, within 1 billion years of the big bang. We find that the most massive progenitors of the Milky Way (MW) and Andromeda (M31) at z=6 and 7 are predicted to have absolute UV continuum magnitudes between -17 and -18, suggesting that their analogues lie close to the detection limits of the deepest near-infrared surveys conducted to date (i.e. HST WFC3/IR UDF12). This in turn confirms that the majority of currently known z=6-8 galaxies are expected to be the seeds of present-day galaxies which are more massive than L* spirals. We also discuss the properties of the local-group progenitors at these early epochs, extending down to absolute magnitudes M_UV = -13. The most massive MW/M31 progenitors at z=7 have stellar masses of about 10^7.5-8 solar masses, stellar metallicities between 3 and 6% of the solar value, and predicted observed UV continuum slopes between -2.4 and -2.5.

Accepted for publication in MNRAS

References in corpus (11)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• The Abundance of Star-Forming Galaxies in the Redshift Range 8.5 to 12: New Results from the 2012 Hubble Ultra Deep Field Campaign
• A new multi-field determination of the galaxy luminosity function at z=7-9 incorporating the 2012 Hubble Ultra Deep Field imaging
• Dust Formation and Survival in Supernova Ejecta
• The UV continua and inferred stellar populations of galaxies at z ~ 7 - 9 revealed by the Hubble Ultra Deep Field 2012 campaign
• The 2012 Hubble Ultra Deep Field (UDF12): Observational Overview
• Dust properties at z=6.3 in the host galaxy of GRB 050904
• Discovery of bright z ~ 7 galaxies in the UltraVISTA survey
• Simulating the assembly of galaxies at redshifts z = 6 - 12

Cited by in corpus (4)

• Introducing the Illustris Project: the evolution of galaxy populations across cosmic time
• UV-Continuum Slopes of >4000 z~4-8 Galaxies from the HUDF/XDF, HUDF09, ERS, CANDELS-South, and CANDELS-North Fields
• Genetically modified halos: towards controlled experiments in $\Lambda$CDM galaxy formation
• Evaluating Galactic Habitability Using High Resolution Cosmological Simulations of Galaxy Formation