Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-16
Astrophys.J. 594 (2003) 63-74
Astronomy and Astrophysics
Astrophysics
36 pages, 7 figures and 10 tables, accepted for publication in ApJ
Scientific paper
10.1086/376858
The faint end of the differential galaxy number counts, n(m), in the Hubble Deep Field (HDF) North has been determined for the F450W, F606W, and F814W filters by means of surface-brightness fluctuation (SBF) measurements. This technique allows us to explore n(m) beyond the limiting magnitude of the HDF, providing new, stronger constraints on the faint end of n(m). This has allowed us to test the validity of previous number count studies and to produce a new determination of the faint end of n(m) for magnitudes fainter than 28.8 in the AB system and to extend this estimate down to 31. This value represents an extension of more than two magnitudes beyond the limits of previous photometric studies. The obtained n(m) slopes are \gamma=0.27, 0.21, and 0.26 in B_{450}, V_{606}, and I_{814}, respectively.
Aparicio Antonio
Marin-Franch Antonio
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