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9.13. Story of the discovery of a massive black hole in NGC4258

Published online by Cambridge University Press:  25 May 2016

M. Miyoshi
M. Miyoshi*
Affiliation:
National Astronomical Observatory, Japan 2-12 Hoshigaoka, Mizusawa, Iwate 023, Japan

Extract

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In the Autumn of 1991, Nakai et al.(1993) began monitoring observations of water mega masers including NGC4258 using Nobeyama 45 m telescope. The 45 m telescope was equipped with wide band cooled HEMT receiver (22 GHz) and wide band spectrometers (AOS). Nakai used 8 AOSs which covered 4480 km/sec in velocity. It was from the wide-band system that the high velocity maser components were detected unexpectedly which locate ±1000 km/sec from the known features of the NGC4258 (Claussen et al. 1984). The finding was in May 1992 when busy Nakai got time checking the data deeply, half year had passed since the beginning of the observations.

Type
Part III. Black Holes and Central Activity
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 407 - 408
Copyright
Copyright © Kluwer 1998 

References

Claussen, M.J., Heiligman, G.M. and Lo, K. -Y. (1984) Nature, Vol.310, pp.298.CrossRefGoogle Scholar
Miyoshi, M., Moran, J., Herrnstein, J., Greenhill, L., Nakai, N., Diamond, P. and Inoue, M. (1995) Nature, Vol.373, pp.127–129.Google Scholar
Nakai, N., Inoue, M. and Miyoshi, M. (1993) Nature, Vol.361, pp.45–47.Google Scholar