J/A+A/540/A43 New redshifts for Abell 1758N galaxies (Boschin+, 2012)
Abell 1758N from an optical point of view: new insights on a merging cluster
with diffuse radio emission.
Boschin W., Girardi M., Barrena R., Nonino M.
<Astron. Astrophys., 540, A43 (2012)>
=2012A&A...540A..43B 2012A&A...540A..43B
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Radial velocities
Keywords: galaxies: clusters: individual: Abell 1758N -
galaxies: clusters: general - galaxies: kinematics and dynamics
Abstract:
The mechanisms producing the diffuse radio emission in galaxy
clusters, and in particular their connection with cluster mergers, are
still debated.
We seek to explore the internal dynamics of the cluster Abell 1758N,
which has been shown to host a radio halo and two relics, and is known
to be a merging bimodal cluster.
Our analysis is mainly based on new redshift data for 137 galaxies
acquired at the Telescopio Nazionale Galileo, only four of which have
redshifts previously listed in the literature. We also used
photometric data from the Sloan Digital Sky Survey and from the
Canada-France-Hawaii Telescope archive. We combined galaxy velocities
and positions to select 92 cluster galaxies and analyzed the internal
cluster dynamics.
Description:
Multi-object spectroscopic observations of A1758N were carried out at
the TNG, a 4m-class telescope, in May 2008 and May 2009. We used
DOLORES/MOS with the LR-B Grism 1, yielding a dispersion of
187Å/mm. The detector is a 2048x2048 pixels E2V CCD, with a pixel
size of 13.5um. In total, we observed four MOS masks (one in 2008
and three in 2009) for a total of 146 slits.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 137 Velocity catalog of 137 spectroscopically measured
galaxies in the field of the cluster A1758N
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/137] Sequential number
(members and non-members)
5 A1 --- n_IDm [+*] Brightest Cluster Galaxy (BCG) (1)
6- 7 I2 --- IDm [1/92]? Member sequential number
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 31 F4.1 arcsec DEs Declination (J2000)
33- 37 F5.2 mag r'mag r' SDSS magnitude
39- 44 I6 km/s HRV Heliocentric radial velocity, cz☉
46- 48 I3 km/s e_HRV rms uncertainty on HRV
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Note (1): No evident unique dominant galaxy is present in A1758N, instead
there are two BCGs:
+ = BCGN(NW), BCG of the NW subcluster
* = BCGN(SE), BCG of the SE subcluster.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Jun-2012