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TYC 2064-108-1


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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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The Dynamics of A2125
We present 371 galaxy velocities in the field of the very rich clusterA2125 (z~0.25). These were determined using optical spectroscopycollected over several years from both the WIYN 3.5 m telescope and NOAOMayall 4 m telescope. Prior studies at a variety of wavelengths (radio,optical, and X-ray) have indicated that A2125 is a likelycluster-cluster merger, a scenario that we are able to test using ourlarge velocity database. We identified 224 cluster galaxies, which weresubjected to a broad range of statistical tests using both positionaland velocity information to evaluate the cluster dynamics andsubstructure. The tests confirmed the presence of substructures withinthe A2125 system at high significance, demonstrating that A2125 is acomplex dynamical system. Comparison of the test results with existingsimulations strengthens the merger hypothesis and provides clues aboutthe merger geometry and stage. The merger model for the system canreconcile A2125's low X-ray temperature and luminosity with itsapparently high richness and might also explain A2125's high fraction ofactive galaxies identified in prior radio and optical studies.

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Observation and Astrometry data

Constellation:Hercule
Right ascension:17h03m09.43s
Declination:+24°50'56.6"
Apparent magnitude:8.374
Distance:205.761 parsecs
Proper motion RA:-10.6
Proper motion Dec:28
B-T magnitude:9.587
V-T magnitude:8.475

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 2064-108-1
USNO-A2.0USNO-A2 1125-07971031
HIPHIP 83433

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