J/A+A/489/11 Optical view of Abell 85 filament region (Boue+, 2008)
An optical view of the filament region of Abell 85.
Boue G., Durret F., Adami C., Mamon G.A., Ilbert O., Cayatte V.
<Astron. Astrophys., 489, 11-22 (2008)>
=2008A&A...489...11B 2008A&A...489...11B
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Redshifts
Keywords: galaxies: clusters: individual: Abell 85 -
galaxies: luminosity functions, mass function
Abstract:
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.
Description:
Our analysis is based on images covering the South tip of Abell 85
and its infalling filament, obtained with CFHT MegaPrime/MegaCam
(1x1deg2 field) in October 2004, 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 89 26 Catalogue of the 25 galaxies detected in Hα
and with spectroscopic redshifts (the first 23
belong to the cluster), also including the SDSS
galaxy ACO85J004127.86-092329.54
tablea2.dat 105 58 Catalogue of the 58 galaxies detected in Hα
and with photometric redshifts
tablea3.dat 89 18 Catalogue of the 18 galaxies detected in Hα
and with no photometric redshifts
tablea4.dat 58 101 Broad band magnitudes of the 101 objects detected
in Hα
tablea5.dat 51 6 Broad band magnitudes of the 6 galaxies with
Hα emission in their SDSS spectra but not
detected in our narrow band filter due to its
wavelength cut
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See also:
J/MNRAS/211/637 : Abell 85 CCD observations (Murphy 1984)
J/A+AS/128/67 : BVR photometry of Abell 85 (Slezak+ 1998)
J/A+AS/129/281 : ABCG 85 velocities catalogue (Durret+ 1998)
Byte-by-byte Description of file: tablea[13].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/101]? Sequential number
5- 10 A6 --- --- [ACO85J]
11- 29 A19 --- ACO85J ACO85J Name (HHMMSS.ss+DDMMSS.ss)
31- 36 F6.4 --- z ? SDSS redshift
38- 45 E8.3 mW/m2 F(Ha) ? Hα flux
47- 53 E7.2 mW/m2 e_F(Ha) ? rms uncertainty on F(Ha)
55- 59 F5.1 0.1nm EW(Ha) Hα equivalent width
61- 63 F3.1 0.1nm e_EW(Ha) rms uncertainty on EW(Ha)
65- 72 E8.3 10-7W L(Ha) ? Hα luminosity
74- 80 F7.5 solMass/yr SFR ? Stellar formation rate
82- 89 F8.6 --- n ? Factor n by which the Rc image was
multiplied before being subtracted from
the Hα image
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Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/101] Sequential number
5- 10 A6 --- --- [ACO85J]
11- 29 A19 --- ACO85J ACO85J Name (HHMMSS.ss+DDMMSS.ss)
31- 36 F6.4 --- zph Photometric redshift
38- 43 F6.4 --- zphL Lower value of zph interval
45- 50 F6.4 --- zphU Upper value of zph interval
52- 59 E8.3 mW/m2 F(Ha) Hα flux
61- 68 E8.3 mW/m2 e_F(Ha) rms uncertainty on F(Ha)
69- 73 F5.1 0.1nm EW(Ha) Hα equivalent width
75- 78 F4.1 0.1nm e_EW(Ha) rms uncertainty on EW(Ha)
80- 87 E8.3 10-7W L(Ha) Hα luminosity
89- 95 F7.5 solMass/yr SFR Stellar formation rate
97-105 F9.7 --- n Factor n by which the Rc image was
multiplied before being subtracted from
the Hα image
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/101] Sequential number
5- 10 A6 --- --- [ACO85J]
11- 29 A19 --- ACO85J ACO85J Name (HHMMSS.ss+DDMMSS.ss)
30- 34 F5.2 mag Rcmag WFI Cousins R magnitude (SExtractor MAG_AUTO)
36- 40 F5.2 mag r'mag ?=- MEGACAM r' magnitude (SExtractor MAG_AUTO)
42- 46 F5.2 mag u*mag ?=- MEGACAM u* magnitude (SExtractor MAG_AUTO)
48- 52 F5.2 mag g'mag ?=- MEGACAM g' magnitude (SExtractor MAG_AUTO)
54- 58 F5.2 mag i'mag ?=- MEGACAM i' magnitude (SExtractor MAG_AUTO)
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3 I1 --- Num [1/6] Sequential number
5- 10 A6 --- --- [ACO85J]
11- 29 A19 --- ACO85J ACO85J Name (HHMMSS.ss+DDMMSS.ss)
31- 36 F6.4 --- z SDSS redshift
38- 42 F5.2 mag rmag ?=- SDSS r magnitude
44- 47 F4.1 0.1nm EW(Ha) Hα equivalent width
49- 51 F3.1 0.1nm e_EW(Ha) rms uncertainty on EW(Ha)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Dec-2008