J/A+A/514/A60 Galaxies of J0454-0309 lensing fossil group (Schirmer+, 2010)
J0454-0309: evidence of a strong lensing fossil group falling into a poor
galaxy cluster.
Schirmer M., Suyu S., Schrabback T., Hildebrandt H., Erben T., Halkola A.
<Astron. Astrophys., 514, A60-60 (2010)>
=2010A&A...514A..60S 2010A&A...514A..60S
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ;
Keywords: galaxies: evolution - galaxies: clusters: individual: J0454-0309 -
galaxies: formation
Abstract:
We have discovered a strong lensing fossil group (J0454) projected
near the well-studied cluster MS0451-0305. Using the large amount of
available archival data, we compare J0454 to normal groups and
clusters. A highly asymmetric image configuration of the strong lens
enables us to study the substructure of the system.
We used multicolour Subaru/Suprime-Cam and CFHT/Megaprime imaging,
together with Keck spectroscopy to identify member galaxies. A
VLT/FORS2 spectrum was taken to determine the redshifts of the
brightest elliptical and the lensed arc. Using HST/ACS images, we
determined the group's weak lensing signal and modelled the strong
lens system. This is the first time that a fossil group is analysed
with lensing methods. The X-ray luminosity and temperature were
derived from XMM-Newton data.
Description:
We serendipitously discovered J0454 in deep Subaru/Suprime-Cam images
of MS0451. Images were taken in nine different nights during six
periods between 2001-01-22 and 2006-12-21 (PIs: H. Ebeling, N. Yasuda,
G. Kosugi). We complemented the BVRIz Subaru/Suprime-Cam data with
u*griz CFHT/Megaprime images, which improves the photometric redshifts
as a result of the presence of u*-band.
Objects:
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RA (2000) DE Designation(s)
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04 54 10.9 -03 01 07 MS0451-0305 = ClG 0451.6-0305
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 79 64 Members of J0454, ordered by increasing
separation r from E0454
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number, [SSS2010] NN in Simbad
3 A1 --- n_Seq [*] additional galaxy (1)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 32 F4.2 arcmin r Separation from the giant elliptical galaxy
E0454
34- 38 F5.2 mag Imag Subaru/I Suprime-Cam Ic magnitude
40- 43 F4.2 mag B-V Subaru/Suprime-Cam B-V colour index
45- 48 F4.2 mag V-I Subaru/Suprime-Cam V-I colour index
50- 55 F6.2 mag gMAG CFHT/Megaprime absolute g magnitude after
extinction- and k-correction
57- 62 F6.2 mag iMAG CFHT/Megaprime absolute i magnitude after
extinction- and k-correction
64- 67 F4.2 --- zph Photometric redshift
69- 75 F7.5 --- zsp ?=- Spectrsocpic redshift
77- 79 A3 --- MType Morphological type (2)
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Note (1): * indicates that it was not photometrically selected, but added
based on the HST/ACS data and was done visually.
Note (2): The morphological classification is based on the HST/ACS data and
was done visually.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Mar-2011