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The optical counterpart of the ultraluminous X-ray source NGC6946 ULX-1

Published online by Cambridge University Press:  01 August 2006

P. K. Abolmasov ,
S. N. Fabrika  and
O. N. Sholukhova
P. K. Abolmasov
Affiliation:
Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 369167, Russia email: [email protected]
S. N. Fabrika
Affiliation:
Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 369167, Russia email: [email protected]
O. N. Sholukhova
Affiliation:
Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 369167, Russia email: [email protected]
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Abstract

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We present a study of a peculiar nebula MF16 associated with an Ultraluminous X-ray Source NGC6946 ULX-1. We use integral-field and long-slit spectral data obtained with the 6-m telescope (Russia). The nebula was for a long time considered powered by strong shocks enhancing both high-excitation and low-excitation lines. However, kinematical properties point to rather moderate expansion rates (VS ∼ 100÷200 km s−1). The total power of the emission-line source exceeds by one or two orders of magnitude the power observed expansion rate can provide, that points towards the existence of an additional source of excitation and ionization. Using CLOUDY96.01 photoionization code we derive the properties of the photoionizing source. Its total UV/EUV luminosity must be about 1040 erg/s.

Keywords

X-rays: individual (NGC6946 X8) – ISM: individual (MF16) – ISM: jets and outflows – ultraviolet: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 229 - 232
Copyright
Copyright © International Astronomical Union 2007

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