منابع مشابه
Quasar Image Shifts due to Gravitational Microlensing
Gravitational microlensing of quasars by stars in external galaxies can introduce fluctuations in the centroid of the “point-like” macro–images. The induced shifts are extremely small, on micro–arcsecond scales, below the limits of current optical observations. However, such shifts will become measurable with the proposed “Space Interferometry” mission, due to fly in 2005. The degree of the cen...
متن کاملThe FIRST-2MASS Red Quasar Survey
Combining radio observations with optical and infrared color selection – demonstrated in our pilot study to be an efficient selection algorithm for finding Astronomy Department, California Institute of Technology, Pasadena, CA, 91125 Columbia Univeristy Department of Astronomy, 550 West 120th Street, New York, NY 10027 Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 ...
متن کاملRed noise and regime shifts
The analysis of interdecadal physical and biological variability is made challenging by the relative shortness of available time series. It has been suggested that rapid temporal changes of the most energetic empirical orthogonal function of North Pacific sea surface temperature (sometimes called the Pacific Decadal Oscillation or PDO) represents a ‘‘regime shift’’ between states with otherwise...
متن کاملRed Companions to a z=2.15 Radio Loud Quasar
We have conducted observations of the environment around the z=2.15 radio loud quasar 1550-269 in search of distant galaxies associated either with it or the z=2.09 CIV absorber along its line of sight. Such objects will be distinguished by their red colours, R-K>4.5. We find five such objects in a 1.5 arcmin field around the quasar, with typical K’ magnitudes of ∼20.4 and no detected R band em...
متن کاملEffects of Red Shifts on the Distribution of Nebulae.
Two new surveys of nebulae, to wpg= 18.47 aQd 21.03,are described which, together w ith three earlier surveys to wpg= 19, 19.4, and 20, indicate the apparent distribution in depth. The numbers of nebulae per square degree, N , to limiting magnitudes m, are represented b y the relation lo g iV = o .6 (m— Am) — 9.052 + 0.005 ,
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ژورنال
عنوان ژورنال: Science
سال: 1966
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.152.3726.1283-b