J/ApJ/903/151 MMT spectroscopic redshift catalog of the A521 field (Yoon+, 2020)
Toward Solving the Puzzle: Dissecting the Complex Merger A521 with
Multiwavelength Data.
Yoon M., Lee W., Jee M.J., Finner K., Smith R., Kim J.-W.
<Astrophys. J., 903, 151 (2020)>
=2020ApJ...903..151Y 2020ApJ...903..151Y
ADC_Keywords: Clusters, galaxy; Spectra, optical; Redshifts
Keywords: Galaxy clusters ; Abell clusters ; Intracluster medium ;
Gravitational lensing
Abstract:
A521 has been a subject of extensive panchromatic studies from X-ray
to radio. The cluster possesses a number of remarkable features,
including a bright radio relic with a steep spectrum, more than three
distinct galaxy groups forming a filament, and two disturbed X-ray
peaks at odds with the distant position and tilted orientation of the
radio relic. These lines of evidence indicate a complex merger. In
this paper, we present a multiwavelength study of A521 based on Subaru
optical, Hubble Space Telescope infrared, Chandra X-ray, Giant
Metrewave Radio Telescope radio, and Multiple Mirror Telescope optical
spectroscopic observations. Our weak-lensing (WL) analysis with
improved systematics control reveals that A521 is mainly composed of
three substructures aligned in the northwest to southeast orientation.
These WL mass substructures are remarkably well-aligned with the
cluster optical luminosity distribution constructed from our new
enhanced cluster member catalog. These individual substructure masses
are determined by simultaneously fitting three Navarro-Frenk-White
profiles. We find that the total mass of A521 modeled by the
superposition of the three halos is 13.0-1.3+1.0x1014M☉, a
factor of 2 higher than the previous WL measurement. With these WL
mass constraints combined with X-ray and radio features, we consider
two merging scenarios, carry out the corresponding numerical
simulations, and discuss the strengths and weaknesses of each case.
Description:
Fiber spectrograph imaging of A521 was combinedpleted as part of a
merging cluster program (PI: K.Finner) with the Multi Mirror Telescope
(MMT) Hectospec. The observations were conducted on the nights of 2019
October 22 and 23 under clear skies with seeing of 0.9" and 0.7",
respectively. Hectospec consists of 300 fibers within its diameter
field of view. We utilized the 270 grating (spectral range
3650-9200Å) and performed two configurations of three 1200s
integrations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 43 396 *MMT Hectospec spectroscopic redshift catalog of the
A521 field
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Note on table1.dat: MMT Hectospec observations from Oct. 22-23 2019.
Targets span approximately 1degree diameter MMT field of view. Spectra
reduced with HSRED 2.0 pipeline. Redshifts determine with hsreduce.
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
J/A+A/399/813 : Multiple merging events in Abell 521 (Ferrari, 2003)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/A+A/581/A14 : Updated Planck catalogue PSZ1 (Planck+, 2015)
J/MNRAS/466/2614 : Complex cluster Abell 1758 stars (Monteiro-Oliveira+, 2017)
J/ApJ/882/69 : Radio merging galaxy cluster substructures (Golovich+, 2019)
J/ApJS/240/39 : Merging galaxy cluster deep observations (Golovich+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.8 deg RAdeg [72/75] Right Ascension (J2000)
13- 25 F13.9 deg DEdeg [-11/-9] Declination (J2000)
27- 34 F8.6 --- zspec [0.09/0.67] Spectroscopic redshift
36- 43 E8.2 --- e_zspec [7.32e-06/0.00045] 1-sigma uncertainty in zspec
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History:
From electronic version of the journal
(End) Prepared by [AAS], Fix Coralie [CDS], 25-Feb-2022