文章基本信息

标题：Multi-wavelength structure analysis of local cluster galaxies
其他标题：The WINGS project⋆
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作者：A. Psychogyios ; M. Vika ; V. Charmandaris 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：633
页码：1-15
DOI：10.1051/0004-6361/201833522
语种：English
出版社：EDP Sciences
摘要：We present a multi-wavelength analysis of the galaxies in nine clusters selected from the WINGS dataset, examining how galaxy structure varies as a function of wavelength and environment using the state of the art softwareGALAPAGOS-2. We simultaneously fit single-Sérsic functions on three optical (u,BandV) and two near-infrared (JandK) bands thus creating a wavelength-dependent model of each galaxy. We measure the magnitudes, effective radius (Re), the Sérsic index (n), axis ratio, and position angle in each band. The sample contains 790 cluster members (located close to the cluster centre < 0.64 × R200) and 254 non-member galaxies that we further separate based on their morphology into ellipticals, lenticulars, and spirals. We find that the Sérsic index of all galaxies inside clusters remains nearly constant with wavelength whileRedecreases as wavelength increases for all morphological types. We do not observe a significant variation onnandReas a function of projected local density and distance from the clusters centre. Comparing thenandReof bright cluster galaxies with a subsample of non-member galaxies we find that bright cluster galaxies are more concentrated (display highnvalues) and are more compact (lowRe). Moreover, the light profile (??) and size (ℛ) of bright cluster galaxies does not change as a function of wavelength in the same manner as non-member galaxies.
关键词：engalaxies: clusters: generalgalaxies: structure