We have studied the stellar and interstellar environments of two luminous X-ray sources and five ultraluminous X-ray sources (ULXs) in order to gain insight into their nature. Archival Hubble Space Telescope images were used to identify the optical counterparts of the ULXs Ho IX X-1 and NGC 1313 X-2, and to make photometric measurements of the local stellar populations of these and the luminous source IC 10 X-1. We obtained high-dispersion spectroscopic observations of the nebulae around these seven sources to search for He II lambda-4686 emission and to estimate the expansion velocities and kinetic energies of these nebulae. Our observations did not detect nebular He II emission from any source, with the exception of LMC X-1; this is eithe...
Here we present the results of panoramic and long-slit observations of eight ULX nebular counterpart...
Ultra-luminous X-ray sources (ULXs) have only recently been established as a class of off-nuclear po...
We present a detailed analysis of XMM archival data of two Ultraluminous X-ray Sources (ULXs) in the...
We have studied the stellar and interstellar environments of two luminous X-ray sources and five ult...
8 pages, 8 figures, to appear in the proceedings of the symposium 'New Visions of the X-ray Universe...
Optical studies of ultra-luminous X-ray sources is an essential step in understanding the nature of ...
Optical studies of ultraluminous X-ray sources (ULX) in nearby galaxies have turned out to be instru...
We present a summary of our ongoing efforts to study one of the brightest ultraluminous X-ray source...
Ultraluminous X-ray sources (ULXs) are point-like objects that emit at luminosities intermediate bet...
We present the results of deep optical spectroscopic observations using the LRIS spectrograph on the...
International audienceContext. The shape of the ionising spectra of galaxies is a key ingredient to ...
We present optical observations of an ultraluminous X-ray source (ULX) in Holmberg IX, a dwarf galax...
We report the identification of the possible optical counterparts of five out of seven ultraluminous...
New optical narrowband imaging observations of the fields of several ultra-luminous X-ray sources (U...
We determined oxygen and iron abundances of the interstellar medium (ISM) using K-shell (O) and L-sh...
Here we present the results of panoramic and long-slit observations of eight ULX nebular counterpart...
Ultra-luminous X-ray sources (ULXs) have only recently been established as a class of off-nuclear po...
We present a detailed analysis of XMM archival data of two Ultraluminous X-ray Sources (ULXs) in the...
We have studied the stellar and interstellar environments of two luminous X-ray sources and five ult...
8 pages, 8 figures, to appear in the proceedings of the symposium 'New Visions of the X-ray Universe...
Optical studies of ultra-luminous X-ray sources is an essential step in understanding the nature of ...
Optical studies of ultraluminous X-ray sources (ULX) in nearby galaxies have turned out to be instru...
We present a summary of our ongoing efforts to study one of the brightest ultraluminous X-ray source...
Ultraluminous X-ray sources (ULXs) are point-like objects that emit at luminosities intermediate bet...
We present the results of deep optical spectroscopic observations using the LRIS spectrograph on the...
International audienceContext. The shape of the ionising spectra of galaxies is a key ingredient to ...
We present optical observations of an ultraluminous X-ray source (ULX) in Holmberg IX, a dwarf galax...
We report the identification of the possible optical counterparts of five out of seven ultraluminous...
New optical narrowband imaging observations of the fields of several ultra-luminous X-ray sources (U...
We determined oxygen and iron abundances of the interstellar medium (ISM) using K-shell (O) and L-sh...
Here we present the results of panoramic and long-slit observations of eight ULX nebular counterpart...
Ultra-luminous X-ray sources (ULXs) have only recently been established as a class of off-nuclear po...
We present a detailed analysis of XMM archival data of two Ultraluminous X-ray Sources (ULXs) in the...