J/AJ/162/193 Redshift survey nearby galaxy cluster A2626 (Healy+, 2021)
A2626 and friends: large- and small-scale structure.
Healy J., Willner S.P., Verheijen M.A.W., Blyth S.-L.
<Astron. J., 162, 193-193 (2021)>
=2021AJ....162..193H 2021AJ....162..193H (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy; Galaxies, spectra; Redshifts; Spectra, optical
Keywords: Galaxy clusters; Galaxy spectroscopy; Abell clusters; Redshift surveys
Abstract:
New MMT/Hectospec spectroscopy centered on the galaxy cluster A2626
and covering a ∼1.8deg2 area out to z∼0.46 more than doubles the
number of galaxy redshifts in this region. The spectra confirm four
clusters previously identified photometrically. A2625, which was
previously thought to be a close neighbor of A2626, is in fact much
more distant. The new data show six substructures associated with
A2626 and five more associated with A2637. There is also a highly
collimated collection of galaxies and galaxy groups between A2626 and
A2637 having at least three and probably four substructures. At larger
scales, the A2626-A2637 complex is not connected to the
Pegasus-Perseus filament.
Description:
The A2626 field was observed with nine Hectospec configurations
designed to maximize the number of galaxies, and especially the number
of bright galaxies, observed. The plan was to observe five
configurations with a 45minute exposure time and four with 105minutes,
but in some cases longer exposures were obtained.
Hectospec is a fiber-fed spectrograph operating at the MMT in Arizona,
USA. Its 300 fibers, each subtending a 1.5" diameter on the sky,
patrol a circle of radius 0.5° with the constraint that the
distance between fibers must be at least 20". The 270lpm grating gave
a wavelength coverage 3725-9150Å with a spectral resolution of
6Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 136 2274 MMT redshifts
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See also:
VII/4 : Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
J/ApJ/797/82 : Brightest cluster galaxies in Abell clusters (Lauer+, 2014)
J/AJ/151/78 : Jellyfish galaxy candidates galaxy clusters (Poggianti+, 2016)
J/MNRAS/460/3669 : Brightest cluster galaxies Radio luminosity (Yuan+, 2016)
J/AJ/156/18 : APOGEE DR14:Binary comp.of evolved stars (Price-Whelan+, 2018)
J/A+A/643/A172 : Abell 2626 radio source LOFAR image at 144MHz (Ignesti+, 2020)
J/A+A/650/A76 : HI content in Coma cluster substructure (Healy+, 2021)
J/A+A/654/A173 : MeerKAT 21-cm HI imaging of Abell 2626 (Healy+, 2021)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID Galaxy nickname in data file
12- 13 I2 h RAh [23] Hour of Right Ascension (J2000)
15- 16 I2 min RAm [33/40] Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [+] Sign of the Declination (J2000)
25- 26 I2 deg DEd [20/22] Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 40 F5.2 mag gmag [0/25.6] SDSS petroMag_g AB magnitude
42- 46 F5.2 mag rmag [0/24.8] SDSS petroMag_r AB magnitude
48- 52 F5.2 mag f2mag [0/23.8] SDSS fiber2mag_g AB magnitude
54- 58 F5.2 mag g-r [-5.22/3.06] SDSS cModel (g-r) AB color
60 I1 --- q_z [0/4] ? Quality flag on z
62- 70 F9.6 --- z [-0.003/2.68] Spectroscopic redshift
72- 79 F8.6 --- e_z [0.00001/0.007] Uncertainty in z (1)
81 A1 --- Flag [a] Flag if alternative template used
83- 92 A10 --- Template Redshift template used
94- 97 F4.1 --- R [0/35.8] Template correlation coefficient
99-101 A3 --- Config Configuration (2)
103-105 A3 --- Fiber Fiber
106-136 A31 --- Comment Comments
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Note (1): Uncertainty of fit to chosen template. Table 2 gives uncertainty
due to template choice, which should be added in quadrature
to the tabulated value.
Template N Δcz Δz
=======≡= =≡= ======≡=
sptemp 1011 17 0.000057
m31ktemp 364 19 0.000063
eltemp 294 25 0.000083
hemtemp0.0 282 14 0.000047
habtemp90 190 24 0.000080
eatemp 69 29 0.000097
m31ftemp 46 23 0.000077
m31atemp 11 31 0.000103
Note (2): Hectospec configurations
Config RA J2000 DE J2000 Date Exp. time
===≡= =======≡= =====≡= =======≡=
c_1 23:38:02.6 21:19:45 2019-09-03 105
c_2 23:37:25.6 20:47:21 2019-09-04 105
b_1 23:37:31.0 21:34:02 2019-10-24 45
b_2 23:38:16.9 21:05:37 2019-10-24 54
a_2 23:36:03.6 20:43:19 2020-06-20 45
d_1 23:35:09.4 20:53:36 2020-06-22 114
e_2 23:35:21.3 21:24:28 2020-09-11 60
f_1 23:35:00.3 21:20:06 2020-10-07 120
e_1 23:37:55.3 21:15:48 2020-10-08 45
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Dec-2021