2016MNRAS.462L..51B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST10:17:12

2016MNRAS.462L..51B - Mon. Not. R. Astron. Soc., 462, L51-L55 (2016/October-2)

The Local Group: the ultimate deep field.

BOYLAN-KOLCHIN M., WEISZ D.R., BULLOCK J.S. and COOPER M.C.

Abstract (from CDS):

Near-field cosmology - using detailed observations of the Local Group and its environs to study wide-ranging questions in galaxy formation and dark matter physics - has become a mature and rich field over the past decade. There are lingering concerns, however, that the relatively small size of the present-day Local Group (∼2 Mpc diameter) imposes insurmountable sample-variance uncertainties, limiting its broader utility. We consider the region spanned by the Local Group's progenitors at earlier times and show that it reaches 3 arcmin ≃ 7 comoving Mpc in linear size (a volume of ≃350 Mpc3) at z = 7. This size at early cosmic epochs is large enough to be representative in terms of the matter density and counts of dark matter haloes with Mvir(z = 7) <= 2 x 109 M. The Local Group's stellar fossil record traces the cosmic evolution of galaxies with 103 <= M*(z = 0)/M <= 109 (reaching M1500 > -9 at z ∼ 7) over a region that is comparable to or larger than the Hubble Ultra-Deep Field (HUDF) for the entire history of the Universe. In the JWST era, resolved stellar populations will probe regions larger than the HUDF and any deep JWST fields, further enhancing the value of near-field cosmology.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - Local Group - cosmology: observations - cosmology: theory - cosmology: theory

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1216 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14327 1
3 NAME Local Group GrG ~ ~           ~ 6661 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-10:17:12

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