Searching for the X-Ray Signature to Current Radio Activity in M31*

Details Searching for the X-Ray Signature to Current Radio Activity in M31* Searching for the X-Ray Signature to Current Radio Activity in M31*

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1341p&link_type=abstract

Chandra Proposal ID #03608117

Physics

Chandra Proposal Id #03608117

Scientific paper

M31*, the radio source identified with the super-massive black hole in M31, has recently brightened significantly, from ~50+/-9 microJy on July 5 to ~90+/-9 microJy on July 29 (5 GHz, VLA). This is the first significant evidence for radio variability. We request a 5 ksec ACIS-I observation to determine how this variability is reflected in x-rays. The typical luminosity of the x-ray counterpart, in several Chandra observations, is ~4e36 ergs/sec (0.5-7 keV) but it has occasionally brightened by a factor of 2-4. However, there are no contemporary radio observations and thus the x-ray/radio correlation is unknown. A Chandra observation of unusual activity in the x-ray counterpart NOW would: 1) strengthen the x-ray identification with M31*, which is now based only on position; 2) constrain source emission models, some of which predict anti-correlated radio and x-ray variability.

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