2008A&A...489...11B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET19:49:59

2008A&A...489...11B - Astronomy and Astrophysics, volume 489, 11-22 (2008/10-1)

An optical view of the filament region of Abell 85.

BOUE G., DURRET F., ADAMI C., MAMON G.A., ILBERT O. and CAYATTE V.

Abstract (from CDS):

We present an optical investigation of the Abell 85 cluster filament (z=0.055) previously interpreted in X-rays as groups falling on to the main cluster. We compare the distribution of galaxies with the X-ray filament, and investigate the galaxy luminosity functions in several bands and in several regions. We search for galaxies where star formation may have been triggered by interactions with intracluster gas or tidal pressure due to the cluster potential when entering the cluster. Our analysis is based on images covering the South tip of Abell 85 and its infalling filament, obtained with CFHT MegaPrime/MegaCam (1x1 deg2 field) in four bands (u*, g', r', i') and ESO 2.2m WFI (38x36arcmin2 field) in a narrow band filter corresponding to the redshifted Hα line and in an RC broad band filter. The LFs are estimated by statistically subtracting a reference field. Background contamination is minimized by cutting out galaxies redder than the observed red sequence in the g'-i' versus i' colour-magnitude diagram. The galaxy distribution shows a significantly flattened cluster, whose principal axis is slightly offset from the X-ray filament. The analysis of the broad band galaxy luminosity functions shows that the filament region is well populated. The filament is also independently detected as a gravitationally bound structure by the Serna & Gerbal (1996A&A...309...65S) hierarchical method. 101 galaxies are detected in the Hα filter, among which 23 have spectroscopic redshifts in the cluster, 2 have spectroscopic redshifts higher than the cluster and 58 have photometric redshifts that tend to indicate that they are background objects. One galaxy that is not detected in the Hα filter probably because of the filter low wavelength cut but shows Hα emission in its SDSS spectrum in the cluster redshift range has been added to our sample. The 24 galaxies with spectroscopic redshifts in the cluster are mostly concentrated in the South part of the cluster and along the filament. We find a number of galaxies showing evidence for star formation in the filament, and all our results are consistent with the previous hypothesis that the X-ray filament in Abell 85 is a gravitationally bound structure made of groups falling on to the main cluster.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Abell 85 - galaxies: luminosity functions, mass function

VizieR on-line data: <Available at CDS (J/A+A/489/11): tablea1.dat tablea2.dat tablea3.dat tablea4.dat tablea5.dat>

Nomenclature: Tables A4, A5, col(2): [BDA2008] ACO85JHHMMSS.ss+DDMMSS.s N=101+6.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

CDS comments: Tables A4, A5, col(1): numbering NNN is not used in SIMBAD.

Simbad objects: 9

goto Full paper

goto View the reference in ADS

Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LEDA 991644 GiC 00 41 27.864 -09 23 29.57     17.80     ~ 8 0
2 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 806 0
3 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 664 2
4 RL 149 HS* 07 24 14.3741222640 -00 33 04.164965943 12.958 13.737 13.866 13.906 13.974 sdB 110 0
5 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1007 1
6 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4319 2
7 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1179 0
8 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 255 2
9 SA 113- reg 21 40 58.9 +00 27 43           ~ 55 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...489...11B and select 'bookmark this link' or equivalent in the popup menu


2021.03.08-19:49:59

© Université de Strasbourg/CNRS

    • Contact