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Astron. Astrophys. 333, 298-304 (1998)

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The spur-like radio feature in Centaurus

J.A. Combi 1, 2, G.E. Romero* 1, 2, 3 and E.M. Arnal * 1, 4

1 Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Bs. As., Argentina
2 Departamento de Física, Universidad Nacional de La Plata, C.C. 67, (1900) La Plata, Argentina
3 Instituto Astronômico e Geofísico, Universidade de São Paulo, Av. M. Stefano 4200, CEP 04301-904 São Paulo, SP, Brazil
4 Fac. de Cs. Astronómicas y Geofísicas, UNLP, Paseo del Bosque s/n, (1900) La Plata, Argentina

Received 25 November 1997 / Accepted 5 January 1998

Abstract

We present a study of the radio emission of the Centaurus region at galactic latitudes [FORMULA], using pre-existing 408 MHz continuum data and results of new 1.42 GHz continuum and neutral hydrogen line observations. It is shown that the extensive spur-like radio feature visible in this region has a non-thermal nature and is actually formed by several previously unidentified individual sources. Five new supernova remnant (SNR) candidates have been detected at relatively high latitudes. Three of them, as well as two former candidates reported by Duncan et al. (1995), were confirmed through the computation of their spectral indices. One of the new SNRs, G315.4+12.9, might be associated with the open cluster NGC 5460.

Key words: radio continuum: ISM – ISM: structure – ISM: supernova remnants

* Member of CONICET

Send offprint requests to: J.A. Combi, first address

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© European Southern Observatory (ESO) 1998

Online publication: April 15, 1998
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