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Galaxy Formation: ISOCAM Counts

Published online by Cambridge University Press:  25 May 2016

C.J. Cesarsky  and
D. Elbaz
C.J. Cesarsky
Affiliation:
Service d'Astrophysique, CEA, DSM, DAPNIA, CE Saclay, F91191 Gif-Sur-Yvette cedex, France
D. Elbaz
Affiliation:
Service d'Astrophysique, CEA, DSM, DAPNIA, CE Saclay, F91191 Gif-Sur-Yvette cedex, France

Extract

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Detailed observations in the optical do not allow to discriminate between the following scenarii of galaxy formation:

- synchronous formation at large redshift (z > 7).

- hierarchical merging, down to z ≤ 1, of proto-galactic lumps formed at very high redshift (≈ 10).

- galaxy formation at low z (≈ 2-5), but partially obscured by dust.

More than 1500 galaxies in a field of 2.6′ × 4.6′ were detected by Tyson (1988) with CCD images in the B band. These deep counts of galaxies revealed the presence of an unexpectedly large population of blue galaxies, corresponding to a number excess of 3 to 5 times more galaxies at B > 23 than one can expect from the local luminosity function. These objects lie apparently at moderate redshift (z = 0.3 for B = 23–24) as shown by spectroscopy of B-selected galaxies (Colless et al. 1990).

Type
Part I: Invited Reviews
Information
Symposium - International Astronomical Union , Volume 168: Examining the Big Bang and the Diffuse Background Radiations , 1996 , pp. 109 - 116
Copyright
Copyright © Kluwer 1996 

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