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Astron. Astrophys. 337, 17-24 (1998)

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A redshift survey between the clusters of galaxies A 548 and A 3367 *

G. Andreuzzi 1, 2, S. Bardelli 3, R. Scaramella 2 and E. Zucca 4

1 Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
2 Osservatorio Astronomico di Roma, Via Osservatorio 2, I-00040 Monteporzio Catone (RM), Italy
3 Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
4 Osservatorio Astronomico di Bologna, Via Zamboni 33, I-40126 Bologna, Italy

Received 16 April 1998 / Accepted 9 June 1998

Abstract

In this paper we present the results of a spectroscopic survey of galaxies in an area between the two clusters of galaxies A 548 and A 3367, suspected to be a close and interacting pair. With the use of multifiber spectroscopy, we measured 180 new velocities of galaxies in the central part of A 3367 and in the external regions of A 548.

The redshift histogram shows the presence of three velocity peaks, at [FORMULA] km/s, [FORMULA] km/s and [FORMULA] km/s, respectively. For these we estimate the density excess, the mean velocity, and the velocity dispersion.

The first clump corresponds to an elongation of A 548: in particular we found a correspondence between the features of this peak and the substructures of A 548. The second peak has a velocity dispersion which is typical of clusters and the distribution of its members on the plane of the sky corresponds to the highest density peak in A 3367. We therefore suggest that the name A 3367 has to be attributed to this clump.

Our general conclusion is that, differently from expected, A 548 and A 3367 do not form a close pair of merging clusters, since the two structures are at significantly different redshifts. Moreover, we found that the complex dynamical structure of A 548 has large coherence, with a projected extension in the range of 1-3 h-1 Mpc.

Key words: galaxies: clusters: individual: A 548; A 3367 – galaxies: clusters: general – galaxies: distances and redshifts

* based on observations collected at the European Southern Observatory, La Silla, Chile

Send offprint requests to: S. Bardelli, (bardelli@astrts.oat.ts.astro.it)

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© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998
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