Astronomy and Astrophysics, volume 349, 97-107 (1999/9-1)
A multi-wavelength analysis of the cluster of galaxies ABCG 194.
NIKOGOSSYAN E., DURRET F., GERBAL D. and MAGNARD F.
Abstract (from CDS):
We present a morphological and structural analysis of the Richness zero cluster ABCG 194, known as a ``linear cluster''. This study is based on a catalogue of 97 galaxies with B magnitudes and redshifts belonging to the cluster, a ROSAT PSPC image and radio data. We show that the overall large scale structure is rather smooth and comparable at optical and X-ray wavelengths. The cluster is elongated along PA≃50; however it appears as ``linear'' when taking into account only galaxies in the very central part (the axial ratio varies from 0.2 in the central region to 0.8 for a larger region). We have obtained the galaxy density profile and despite the very low X-ray emission the X-ray emitting gas density profile. We have estimated the X-ray gas and dynamical masses up to the limiting radius RL of the PSPC image (respectively 9x1012 and 8x1013M☉) and the stellar mass up to RL and to 3 Mpc (3x1012 and 7.5x1012M☉). At smaller scales, the analysis of both positions and velocities reveals the existence of several groups but which are not strongly linked dynamically; however a main structure with a nearly gaussian velocity distribution is exhibited. The velocity dispersion is small (σlos=360km/s). A wavelet analysis of the X-ray image reveals no large scale substructures. Small scale X-ray sources are detected, mainly corresponding to individual galaxies; we give an estimate of their luminosities. The lack of strong substructuring suggests that ABCG 194 is overall a relaxed cluster. ABCG 194 is a poor and cold cluster; we compare how its characteristics fit into various correlations found in the literature, but generally for richer/hotter clusters, such as the σ-TX, LX-TX, LX-σ relations or the ratios of various kinds of masses.
galaxies: clusters: general - galaxies: clusters: individual: ABCG 194
Table 5: [NDG99] A (Nos A-I).
p.98: No. 15 = NGC 530, No. 30 = [CGH88] 0123-0136, No. 54 = [CGH88] 0125-0123.
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