SIMBAD references

2020MNRAS.495.2007M - Mon. Not. R. Astron. Soc., 495, 2007-2021 (2020/June-3)

Revising the merger scenario of the galaxy cluster Abell 1644: a new gas poor structure discovered by weak gravitational lensing.

MONTEIRO-OLIVEIRA R., DOUBRAWA L., MACHADO R.E.G., LIMA NETO G.B., CASTEJON M. and CYPRIANO E.S.

Abstract (from CDS):

The galaxy cluster Abell 1644 ({bar}z=0.047) is known for its remarkable spiral-like X-ray emission. It was previously identified as a bimodal system, comprising the subclusters, A1644S and A1644N, each one centred on a giant elliptical galaxy. In this work, we present a comprehensive study of this system, including new weak lensing and dynamical data and analysis plus a tailor-made hydrodynamical simulation. The lensing and galaxy density maps showed a structure in the North that could not be seen on the X-ray images. We, therefore, rename the previously known northern halo as A1644N1 and the new one as A1644N2. Our lensing data suggest that those have fairly similar masses: M200N1=0.90–0.85+0.45 ×1014 and M200N2=0.76–0.75+0.37 ×1014 M, whereas the southern structure is the main one: M200S=1.90–1.28+0.89×1014 M. Based on the simulations, fed by the observational data, we propose a scenario where the remarkable X-ray characteristics in the system are the result of a collision between A1644S and A1644N2 that happened ∼1.6 Gyr ago. Currently, those systems should be heading to a new encounter, after reaching their maximum separation.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): gravitational lensing: weak - dark matter - large-scale structure of Universe

Status at CDS : Examining the need for a new acronym.

CDS comments: A1644N = 2E 2919; A1644S = ACO 1644; BCG N = 2MASX J12574931-1716230; BCG S = 2MASX J12571157-1724344 in Simbad.

Simbad objects: 7

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2021.03.08-02:08:47

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