Very Deep Surveys
نویسندگان
چکیده
منابع مشابه
Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
We describe TRILEGAL, a new populations synthesis code for simulating the stellar photometry of any Galaxy field. The code attempts to improve upon several technical aspects of star count models, by: dealing with very complete input libraries of evolutionary tracks; using a stellar spectral library to simulate the photometry in virtually any broad-band system; being very versatile allowing easy...
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I address the need for deep blazar surveys by showing that our current understanding of blazars is based on a relatively small number of intrinsically luminous sources. I then review the on-going deeper surveys, addressing in particular their limits and limitations. Finally, I present some preliminary results on the evolutionary properties of faint blazars as derived from the Deep X-ray Radio B...
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The ROSAT Deep Survey in the Lockman Hole is the most sensitive X–ray survey performed to date, encompassing an exposure time of 200 ksec with the PSPC and 1.2 Msec with the HRI. The source counts reach a density of ∼ 1000 deg at a limiting flux of ∼ 10 erg cm s. At this level 70–80% of the 0.5–2 keV X–ray background is resolved into discrete sources. Because of the excellent HRI positions, 83 ...
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We present the preliminary results of a survey that makes use of several deep exposures obtained with the X-Ray telescopes of the BeppoSAX satellite. The survey limiting sensitivity is 5× 10 erg cmsin the 2-10 keV band and 7 × 10 erg cmsin the harder 5-10 keV band. We find that the 2-10 keV LogN-LogS is consistent with that determined in ASCA surveys. The counts in the 5-10 keV band imply eithe...
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Deep surveys of the cosmic X-ray background are reviewed in the context of observational progress enabled by the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission-Newton. The sources found by deep surveys are described along with their redshift and luminosity distributions, and the effectiveness of such surveys at selecting active galactic nuclei (AGN) is assessed. Some key results f...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1998
ISSN: 1539-2996
DOI: 10.1017/s1539299600019742