Bibcode
Castro-Rodriguéz, N.; Arnaboldi, M.; Aguerri, J. A. L.; Gerhard, O.; Okamura, S.; Yasuda, N.; Freeman, K. C.
Bibliographical reference
Astronomy and Astrophysics, Volume 507, Issue 2, 2009, pp.621-634
Advertised on:
11
2009
Journal
Citations
42
Refereed citations
32
Description
Aims: The intracluster light (ICL) is a faint diffuse stellar component
of clusters made of stars that are not bound to individual galaxies. We
have carried out a large scale study of this component in the nearby
Virgo cluster. Methods: The diffuse light is traced using
planetary nebulae (PNe). The surveyed areas were observed with a
narrow-band filter centered on the [OIII]λ 5007 Å emission
line redshifted to the Virgo cluster distance (the on-band image), and a
broad-band filter (the off-band image). For some fields, additional
narrow band imaging data corresponding to the Hα emission were
also obtained. The PNe are detected in the on-band image due to their
strong emission in the [OIII]λ 5007 Å line, but disappear
in the off-band image. The contribution of Ly-α emitters at z=3.14
are corrected statistically using blank field surveys, when the Hα
image at the field position is not available. Results: We have
surveyed a total area of 3.3 square degrees in the Virgo cluster with
eleven fields located at different radial distances. Those fields
located at smaller radii than 80 arcmin from the cluster center contain
most of the detected diffuse light. In this central region of the
cluster, the ICL has a surface brightness in the range μB
= 28.8-30 mag arsec-2, it is not uniformly distributed, and
represents about 7% of the total galaxy light in this area. At distances
larger than 80 arcmin the ICL is confined to single fields and
individual sub-structures, e.g. in the sub-clump B, the M 60/M 59 group.
For several fields at 2 and 3 degrees from the Virgo cluster center we
set only upper limits. Conclusions: These results indicate that
the ICL is not homogeneously distributed in the Virgo core, and it is
concentrated in the high density regions of the Virgo cluster, e.g. the
cluster core and other sub-structures. Outside these regions, the ICL is
confined within areas of ~100 kpc in size, where tidal effects may be at
work. These observational results link the formation of the ICL with the
formation history of the most luminous cluster galaxies.
Based on data collected with the 2.5 m Isaac Newton Telescope on La
Palma, the Subaru telescope, operated by the National Astronomical
Observatory of Japan, and the ESO/MPI 2.2 m telescope at La Silla,
Chile, operated by ESO during observing runs 62.N-0248 and 70.B-0086(A).
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