Nancy L. Cohen
Massachusetts Institute of Technology
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Science | 1983
Marc V. Gorenstein; Irwin I. Shapiro; Nancy L. Cohen; B. E. Corey; E. E. Falco; J. M. Marcaide; Alan E. E. Rogers; Alan R. Whitney; R. W. Porcas; R. A. Preston; A. Rius
By use of a new, very sensitive interferometric system, a faint, compact radio source has been detected near the center of the galaxy that acts as the main part of a gravitational lens. This lens forms two previously discovered images of the quasar Q09S7+561, which lies in the direction of the constellation Ursa Major. The newly detected source has a core smaller than 0.002 arc second in diameter with a flux density of 0.6 � 0.1 millijansky at the 13-centimeter wavelength of the radio observations. This source could be the predicted third image of the transparent gravitational lens, the central core of the galaxy, or some combination of the two. It is not yet possible to choose reliably between these alternatives.
Astronomy and Astrophysics | 1985
J. M. Marcaide; I. I. Shapiro; B. E. Corey; W. D. Cotton; M. V. Gorenstein; Alan E. E. Rogers; J. D. Romney; R. E. Schild; L.B. Bååth; N. Bartel; Nancy L. Cohen; T. A. Clark; R. A. Preston; M. I. Ratner; A. R. Whitney
Proceedings of The International Astronomical Union | 1984
J. M. Marcaide; I. I. Shapiro; Nancy L. Cohen; B. E. Corey; William D. Cotton; Marc V. Gorenstein; Alan E. E. Rogers; Jonathan D. Romney; B. O. Ronnang
Archive | 1984
J. M. Marcaide; N. Bartel; Nancy L. Cohen; Marc V. Gorenstein; Irwin I. Shapiro; B. E. Corey; Alan E. E. Rogers; R. A. Preston; Jonathan D. Romney
Archive | 1983
Marc V. Gorenstein; N. Bartel; L. A. Molnar; M. J. Reid; Irwin I. Shapiro; C. L. Bennett; Robert John Bonometti; Bernard F. Burke; Emilio E. Falco; Jacqueline N. Hewitt; Nancy L. Cohen; C. R. Lawrence; Jonathan D. Romney; Alan E. E. Rogers
Archive | 1983
Nancy L. Cohen; Marc V. Gorenstein; Irwin I. Shapiro; Robert John Bonometti; Emilio E. Falco; Alan E. E. Rogers
Archive | 1982
Emilio E. Falco; Marc V. Gorenstein; Irwin I. Shapiro; Nancy L. Cohen
Archive | 1982
Nancy L. Cohen; Marc V. Gorenstein; Irwin I. Shapiro; Emilio E. Falco; J. M. Marcaide; Alan E. E. Rogers; B. E. Corey
Archive | 1982
Marc V. Gorenstein; I. I. Shapiro; Nancy L. Cohen; Emilio E. Falco; J. M. Marcaide; Alan E. E. Rogers; A. R. Whitney; B. E. Corey; R. W. Porcas; R. A. Preston; A. Rius
Archive | 1981
Marc V. Gorenstein; I. I. Shapiro; A. F. F. Rogers; Nancy L. Cohen
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