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20012019
most citedA gravitational-wave standard siren measurement of the Hubble constant

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astro-ph2003★ 253 cited

Dynamical Evidence for a Black Hole in GX 339-4

R. I. Hynes, D. Steeghs, J. Casares +2

We present outburst spectroscopy of GX339-4 which may reveal the motion of its elusive companion star. NIII lines exhibit sharp emission components moving over ~300 km/s in a singl…