A new period of activity in the core of NGC 660

作者：Argo Megan K^*; van Bemmel Ilse M; Connolly Sam D; Beswick Robert J

来源：Monthly Notices of the Royal Astronomical Society, 2015, 452(1): 1081-1088.

DOI：10.1093/mnras/stv1348

• techniques: high angular resolution
• galaxies: individual: NGC 660
• radio continuum: galaxies

The core of the nearby galaxy NGC 660 has recently undergone a spectacular radio outburst; using a combination of archival radio and Chandra X-ray data, together with new observations, the nature of this event is investigated. Radio observations made using e-MERLIN in mid-2013 show a new compact and extremely bright continuum source at the centre of the galaxy. High angular resolution observations carried out with the European VLBI Network show an obvious jet-like feature to the north-east and evidence of a weak extension to the west, possibly a counter-jet. We also examine high angular resolution H I spectra of these new sources, and the radio spectral energy distribution using the new wide-band capabilities of e-MERLIN. We compare the properties of the new object with possible explanations, concluding that we are seeing a period of new active galactic nuclei (AGN) activity in the core of this polar ring galaxy.

• 出版日期2015-9-1