ar X iv : a st ro - p h / 04 05 59 5 v 1 2 9 M ay 2 00 4 Number Counts At 3 < λ < 10 μ m from the Spitzer Space Telescope
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چکیده
Infrared source counts at wavelengths 3 < λ < 10 μm cover more than 10 magnitudes in source brightness, four orders of magnitude in surface density, and reach an integrated surface density of 10 sources deg. At m < 14 mag, most of the sources are Galactic stars, in agreement with models. After removal of Galactic stars, galaxy counts are consistent with what few measurements exist at nearby wavelengths. At 3.6 and 4.5 μm, the galaxy counts follow the expectations of a Euclidean world model down to ∼16 mag and drop below the Euclidean curve for fainter magnitudes. Counts at these wavelengths begin to show decreasing completeness around magnitude 19.5. At 5.8 and 8 μm, the counts relative to a Euclidean world model show a large excess at bright magnitudes. This is probably because local galaxies emit strongly in the aromatic dust (“PAH”) features. The counts at 3.6 μm resolve <50% of the Cosmic Infrared Background at that wavelength. Subject headings: infrared: galaxies — stars: formation — dust, extinction — ISM: lines and bands — galaxies: fundamental parameters Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; gfazio, leallen, mashby, pbarmby, jhora, jhuang, mpahre, zwang, [email protected] Code 685, Goddard Space Flight Center Greenbelt, MD 20771; arendt, [email protected] Jet Propulsion Laboratory, 4800 Oak Grove Dr. Pasadena, CA 91109; [email protected], [email protected], [email protected] Institute for Astronomy, University of Hawaii at Hilo, 640 N. A’ohoku Place, # 209 Hilo, HI 96720; [email protected] UCLA Dept. of Physics & Astronomy PO Box 951562 Los Angeles, CA 90095-1562; [email protected]
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تاریخ انتشار 2004