An accurate position of a new ULX in NGC 4045
Abstract
We recently detected a new X-ray source with Swift/XRT that appears to be associated with the galaxy NGC 4045 (D=32 Mpc). The source was first detected by Swift on 2019-12-04 and the latest detection was on 2019-12-06 with a count rate of 1.4E-02+/-3.3E-03 ct/s. The spectrum can be described by a powerlaw with Gamma=1.1+/-0.7. The 0.3--10 keV flux is 6.8E-13 ergs/cm2/s, which at a distance of 32 Mpc corresponds to a luminosity of 6.3E+40 erg/s. The source is likely a new ULX. No previous X-ray source has been catalogued within several armin of this source. Observations with Swift several months prior yielded only upper limits below the current count rate. We request a 10-ks Chandra observation in order to obtain an accurate position that will potentially enable the identification of an optical/NIR counterpart. An OIR counterpart could yield information about the donor star of the ULX. The 90% positional uncertainty from Swift is only 5.1" and would yield several counterpart candidates.
- Publication:
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Chandra Proposal
- Pub Date:
- December 2018
- Bibcode:
- 2018cxo..prop.5768B
- Keywords:
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- Chandra Proposal ID #20408704