An accretion eruption in the western nucleus of Arp 299

Details An accretion eruption in the western nucleus of Arp 299 An accretion eruption in the western nucleus of Arp 299

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1858n&link_type=abstract

Chandra Proposal ID #06708202

Physics

Chandra Proposal Id #06708202

Scientific paper

Monitoring of starburst galaxies in the NIR at WHT in a search for supernovae (PI: Meikle), has revealed an extraordinary outburst from NGC 3690, part of merging, LIG system Arp 299 (IAUC 8477). Subtraction of a Ks image taken on 2005 Jan 30 from earlier images (most recently 2004 June 5) shows a highly variable source within 0.5 of the iron K_ emitter identified by Chandra as the AGN in NGC 3690 (Ballo et al. ApJ, 600, 634). Such large NIR variability (30%) is generally restricted to powerful radio-loud QSOs+blazars. What makes this event even more remarkable is that the AGN in NGC 3690 is usually very weak. The intrinsic flare is thus likely to be much larger, as the quiescent NIR emission, which is resolved, is likely dominated by stars. We propose a Chandra snapshot to confirm the flare and determine its amplitude. It may be due to a huge accretion event or the rapid formation of a relativistic jet, heralding NGC 3690 s transition into a fully-fledged AGN following the merger.

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