| Issue |
A&A
Volume 379, Number 2, November IV 2001
|
|
|---|---|---|
| Page(s) | 426 - 435 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20011316 | |
| Published online | 15 November 2001 | |
Photometric validation of a model independent procedure to extract galaxy clusters*
1
Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
2
Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy
3
Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Napoli, Italy
4
Johns Hopkins University, Dept. of Physics and Astronomy, 3701 San Martin Dr., Baltimore, MD 21218, USA
Corresponding author: E. Puddu, puddu@na.astro.it
Received:
15
May
2001
Accepted:
20
September
2001
By means of CCD photometry in three bands (Gunn g, r, i)
we investigate the existence of 12 candidate clusters extracted
via a model independent peak finding algorithm ([CITE])
from DPOSS data. The derived color-magnitude diagrams
allow us to confirm the physical nature of 9 of the cluster candidates,
and to estimate their photometric redshifts. Of the other
candidates, one is a fortuitous detection of a true cluster at 
,
one is a false detection and the last is undecidable on the basis
of the available data.
The accuracy of the photometric redshifts is tested on an additional
sample of 8 clusters with known spectroscopic redshifts. Photometric
redshifts turn out to be accurate within 
(interquartile range).
Key words: methods: data analysis / galaxies: clusters: general / galaxies: distances and redshifts
© ESO, 2001
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