نتایج جستجو برای: greenbelt
تعداد نتایج: 756 فیلتر نتایج به سال:
SIGNATURE AROUND LUNAR IMPACT CRATERS. F. T. Freund, H. H. Jones, B. W. S. Lau, A. Takeuchi, NASA Ames Research Center, MS 242-4, Moffett Field, CA 94035, [email protected], Carl Sagan Center, SETI Institute, 515 N Whisman Road, Mountain View, CA 94043, NASA Goddard Space Flight Center, Code 553, Greenbelt, MD 20771, [email protected], Department of Chemistry, Niigata University, ...
We present measurements of the integrated flux relative to the local background of the Large and Small Magellanic Clouds and the region 30-Doradus (the Tarantula Nebula) in the LMC in four frequency bands centered at 245, 400, 460, and 630 GHz, based on observations made with the TopHat telescope. We combine these observations with the corresponding measurements for the DIRBE bands 8, 9, and 10...
The third flight of the Medium Scale Anisotropy Measurement (MSAM1), in June 1995, observed a new strip of sky, doubling the sky coverage of the original MSAM1 dataset. MSAM1 observes with a 0. 5 beam size in four bands from 5–20 cm. From these four bands we derive measurements of cosmic microwave background radiation (CMBR) anisotropy and interstellar dust emission. Our measurement of dust emi...
A direct measurement of the extragalactic background light (EBL) can provide important constraints on the integrated cosmological history of star formation, metal and dust production, and the conversion of starlight into infrared emission by dust. In this paper we examine the cosmological implications of the recent detection of the EBL in the 125 to 5000 μm wavelength region by the Diffuse Infr...
We report on the results of intensive ultraviolet spectral monitoring of the Seyfert 1 galaxy NGC 3783. The nucleus of NGC 3783 was observed with the International Ultraviolet Explorer satellite on a regular basis for a total of 7 months, once every 4 days for the first 172 days and once every other day for the final 50 days. Significant variability was observed in both continuum and emission-l...
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