A rare transient in M81: a merger event?

Details A rare transient in M81: a merger event? A rare transient in M81: a merger event?

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2509j&link_type=abstract

Chandra Proposal ID #09408286

Physics

Chandra Proposal Id #09408286

Scientific paper

A recently discovered optical transient (OT) in M81 (atel #1330) can not be explained by a known transient event, it is a very good merger candidate (NS-NS, BH-NS). Distinguishing properties are: decay rate is too fast for a NOVA, optical brightness is too low for a SN (MV=-7.3), the K-band magnitude and NIR colors rule out a foreground flaring M-dwarf, the source is too bright for an transient X-ray binary. We searched the Chandra archive for the presence of an X-ray source. None was found even after stacking all the ACIS data. A transient X-ray source was observed on 2000-05-07 in Chandra OBS ID 735 close to the position of the OT. However, the distance to the position of the OT was 2.8 arcsec which is too much for the two events to come from the same source. The optical decay time matches the predicted decay time for a merger event (Sylvestre 2003). If this OT is a merger event, X-rays are predicted to be emitted due to either fall back or radio-active decay of ejected material.

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