A Black Hole in XTE J1118+480

McClintock, J.; Garcia, M.; Zhao, P.; Caldwell, N.; Falco, E.
Bibliographical reference

The Astronomer's Telegram, #64

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Spectroscopic observations of this X-ray nova with the new 6.5-m MMT on Dec. 1 & 4 show that it contains a black hole primary of at least 6 solar masses. Our prior photometric observations using the FLWO 1.2-m telescope showed that the X-ray nova was near its pre-outburst brightness (IAUC 7390) at V = 18.8 on Oct. 26.