NGC 4190-ULX1: The forgotten ULX

Details NGC 4190-ULX1: The forgotten ULX NGC 4190-ULX1: The forgotten ULX

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11012r&link_type=abstract

HST Proposal ID #11012. Cycle 15

Astronomy and Astrophysics

Astronomy

Scientific paper

Although it ranks amongst the nearest at d ~ 3 Mpc and brightest fx ~ 2e-12 erg/cm^2/s ULXs, NGC 4190-ULX1 has not yet been observed in the modern era of X-ray astronomy. We propose to remedy this omission with three new observations designed to probe its underlying nature. Firstly, we will obtain a high precision X-ray position of the ULX using HRC-I. This will be used to identify an unique counterpart in new HST/ACS imaging, plausibly the first step towards deriving a dynamical mass function for this source. Finally, we will use an ACIS-S observation to derive the first high quality X-ray diagnostics spectrum, light curve of this ULX, with the aim of providing an interim assessment of the nature of the compact object underlying its extreme X-ray emission.

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