Resumo

TREJO, A.; RODRIGUEZ, L. F.  e  MARTI, J.. In search of a radio counterpart for the ultraluminous X-ray source at the nucleus of M33. Rev. mex. astron. astrofis [online]. 2004, vol.40, n.2, pp.223-229. ISSN 0185-1101.

We present an analysis of radio continuum observations of the nucleus of the spiral galaxy M33, taken from the Very Large Array archives. Most of these observations were made with high angular resolution (≤1") at different epochs and we have used them to search for radio emission associated with the ultraluminous X-ray (ULX) source at the center of M33. At 20 cm, with an angular resolution of 1."3, we detect a source with flux density of 0.20±0.02 mJy that coincides within 0."2 with the position of the center of M33 as reported by 2MASS. In addition, at 3.6 cm (with an angular resolution of 0."3), we detect two faint sources, one of them with a flux density of 0.04±0.01 mJy that is coincident with the 20 cm source (and thus with the center of M33). The second 3.6 cm source, with a flux density of 0.05 ± 0.01 mJy, is ≈ 0."6 north of the first source. Within error, the Chandra position for the ULX overlaps with both 3.6 cm sources.

Palavras-chave : Galaxy [Center]; Galaxy [Individual (M33)]; Radio Continuum [Galaxies].

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )