Broad Components in Optical Emission Lines from the Ultra-Luminous X-ray Source NGC 5408 X-1

Details Broad Components in Optical Emission Lines from the Ultra-Luminous X-ray Source NGC 5408 X-1 Broad Components in Optical Emission Lines from the Ultra-Luminous X-ray Source NGC 5408 X-1

2011-01-07

arxiv.org/abs/1101.1446v1

The Astrophysical Journal Letters 728 (2011) L5

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 3 figures, accepted for publication in ApJ Letters

Scientific paper

10.1088/2041-8205/728/1/L5

High-resolution optical spectra of the ultraluminous X-ray source NGC 5408 X-1 show a broad component with a width of ~750 km/s in the HeII and Hbeta lines in addition to the narrow component observed in these lines and [O III]. Reanalysis of moderate-resolution spectra shows a similar broad component in the HeII line. The broad component likely originates in the ULX system itself, probably in the accretion disk. The central wavelength of the broad HeII line is shifted by 252 \pm 47 km/s between the two observations. If this shift represents motion of the compact object, then its mass is less than ~1800 M_sun.

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