John H. Spencer
United States Naval Research Laboratory
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Publication
Featured researches published by John H. Spencer.
Science | 1977
A. D. Haschick; Bernard F. Burke; John H. Spencer
A line in the water vapor maser spectrum of the HII region W3(OH) was observed to increase in brightness over an 8-day period and then decline to its original intensity over the following 4 weeks. The intensity variation can be explained by a simple maser model, with an impulse of energy suddenly applied. The observed time scale and energy output are consistent with a maser on the outskirts of a dust cocoon surrounding an O5 star, with a momentary leak, lasting a day or. two, supplying the necessary energy.
The Astrophysical Journal | 1975
John H. Spencer; Bernard F. Burke
Observations of selected regions in the direction of M31 provide information on the flux densities and spectral indices between 408 and 8085 MHz for six sources from the 5C 3 catalog. A total of 12 sources were detected at 2695 MHz, and upper limits on flux density and spectral index are provided for 33 undetected sources. Improved positions are given for the detected sources. Spectral indices of the detected 5C 3 sources have steep spectra, which provides an argument that the 5C 3 sources are not associated with M31.
The Astrophysical Journal | 1978
James M. Moran; M. J. Reid; C. J. Lada; J. L. Yen; K. J. Johnston; John H. Spencer
The Astrophysical Journal | 1980
R. Genzel; D. Downes; V. Pankonin; J. W. M. Baars; P. R. Schwartz; John H. Spencer
Astronomy and Astrophysics | 1990
T. P. Krichbaum; R. S. Booth; A. J. Kus; B. O. Roênnaêng; A. Witzel; D. A. Graham; I. I. K. Pauliny-Toth; A. Quirrenbach; C. A. Hummel; A. Alberdi; J. A. Zensus; K. J. Johnston; John H. Spencer; Alan E. E. Rogers; C. R. Lawrence; Anthony C. S. Readhead; Hisashi Hirabayashi; Makoto Inoue; M. Morimoto; V. Dhawan
The Astrophysical Journal | 1977
James M. Moran; K. J. Johnston; John H. Spencer; P. R. Schwartz
The Astrophysical Journal | 1977
S. S. Hansen; James M. Moran; M. J. Reid; K. J. Johnston; John H. Spencer; R. C. Walker
The Astrophysical Journal | 1974
John H. Spencer; Philip R. Schwartz
Publications of the Astronomical Society of Japan | 1996
Claudio E. Tateyama; Makoto Inoue; T. P. Krichbaum; L. B. Baath; Seiji Kameno; Alan E. E. Rogers; Antonio Alberdi; Don Backer; N. Bartel; R. S. Booth; Bernard F. Burke; John E. Carlstrom; Vivek Dhawan; Robert Laurence Dickman; Darrel T. Emerson; Hisashi Hirabayashi; Mark W. Hodges; D. A. Graham; K. J. Johnston; Hideyuki Kobayashi; A. J. Kus; S. Padin; R. L. Plambeck; C. Read Predmore; A. Quirrenbach; C. R. Lawrence; James W. Lamb; J. M. Marcaide; Masak Morimoto; B. O. Ronnang
Astronomy and Astrophysics | 1992
T. P. Krichbaum; A. Witzel; D. A. Graham; W. Alef; I. I. K. Pauliny-Toth; C. A. Hummel; A. Quirrenbach; Makoto Inoue; Hisashi Hirabayashi; M. Morimoto; Alan E. E. Rogers; Rogers; J. A. Zensus; C. R. Lawrence; Anthony C. S. Readhead; R. S. Booth; B. O. Ronnang; A. J. Kus; K. J. Jhohnston; John H. Spencer; Bernard F. Burke; V. Dhawan; N. Bartel; I. I. Shapiro; A. Alberdi; J. M. Marcaide
