Dissecting the Strong-lensing Galaxy Cluster MS0440.5+0204. II. New Optical Spectroscopic Observations in a Wider Area and Cluster Dynamical State

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dc.contributor.authorCarrasco, Eleazar R.
dc.contributor.authorVerdugo, Tomás
dc.contributor.authorMotta, Verónica
dc.contributor.authorFoëx, Gael
dc.contributor.authorEllingson, E.
dc.contributor.authorGomez, Percy L.
dc.contributor.authorFalco, Emilio
dc.contributor.authorLimousin, Marceau
dc.date.accessioned2022-11-30T02:46:14Z
dc.date.available2022-11-30T02:46:14Z
dc.date.issued2021
dc.description.abstractWe present an optical study of the strong-lensing galaxy cluster MS 0440.5+0204 at z = 0.19593, based on CFHT/MegaCam g', r' photometry and GMOS/Gemini and CFHT/MOS/SIS spectroscopy in a broader area than previous works. We have determined new spectroscopic redshifts for the most prominent gravitational arcs surrounding the central galaxy in the cluster. The new redshifts and the information provided by the photometric catalog allow us to perform a detailed weak- and strong-lensing mass reconstruction of the cluster. The large number of member galaxies and the area covered by our observations allow us to estimate more accurately the velocity dispersion and mass of the cluster and to examine in detail the nature of the cluster and surrounding structures. The dynamical mass is in good agreement with the mass inferred from the lensing analysis and X-ray estimates. About 68% of the galaxies are located in the inner ≲0.86 ${h}_{70}^{-1}$ Mpc region of the cluster. The galaxy redshift distribution in the inner region of the cluster shows a complex structure with at least three substructures along the line of sight. Other substructures are also identified in the galaxy density map and in the weak-lensing mass map. The member galaxies in the northeast overdensity are distributed in a filament between the clusters MS 0440.5+0204 and ZwCL 0441.1+0211, suggesting that these two structures might be connected. MS 0440.5+0204 appears to be dynamically active, with a cluster core that is likely experiencing a merging process, and with other nearby groups at projected distances of ≲1 ${h}_{70}^{-1}$ Mpc that could be being accreted by the cluster.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameCarrasco_Dis2021.pdf
dc.identifier.citationEleazar R. Carrasco et al 2021 ApJ 918 61en_ES
dc.identifier.doihttps://doi.org/10.3847/1538-4357/ac0c1b
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7271
dc.languageen
dc.publisherAmerican Astronomical Society (Aas)
dc.sourceThe Astrophysical Journal
dc.subjectGALAXY CLUSTERSen_ES
dc.subjectREDSHIFT SURVEYSen_ES
dc.subjectGRAVITATIONAL LENSINGen_ES
dc.titleDissecting the Strong-lensing Galaxy Cluster MS0440.5+0204. II. New Optical Spectroscopic Observations in a Wider Area and Cluster Dynamical State
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

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