Mathematics – Probability
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2088m&link_type=abstract
Chandra Proposal ID #07628251
Mathematics
Probability
Chandra Proposal Id #07628251
Scientific paper
We have detected with XMM-Newton an off-nuclear ULX candidate in the D25 ellipse of a spiral galaxy at 90 Mpc. If at 90 Mpc, its 0.5-10 keV luminosity is 1.3x10^41 erg/s, the most luminous ULX ever detected. The probability of it being a background AGN is very low based on standard logN-logS (<0.7%) and even lower if the minimum X-ray to Optical flux ratio (>60) is considered. The only available HST image shows several possible counteparts in the XMM error box. We request a 7ks Chandra ACIS-S exposure to measure the X-ray position with high accuracy, which will allow us to identify the counterpart (if any) from HST+Chandra and to organize the optimal follow-up strategy. The Chandra obs by itself may exclude that the ULX is a background AGN if the HST counterpart is identified, allowing us to compute a precise X-ra to Optical ratio which, if > 100 (as for the large majority of possible counterparts), would exclude the AGN hypothesis.
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