Universe opacity and EBL
نویسندگان
چکیده
منابع مشابه
Universe opacity and EBL
The observed extragalactic background light (EBL) is affected by light attenuation due to absorption of light by galactic and intergalactic dust in the Universe. Even galactic opacity of 10-20 percent and minute universe intergalactic opacity of 0.01 mag h Gpc ́1 at the local Universe have a significant impact on the EBL because obscuration of galaxies and density of intergalactic dust increase ...
متن کاملThe Universe Viewed in Gamma - Rays 1 The Extragalactic Background Light and the γ – Ray Opac - ity of the Local Universe
The extragalactic background light (EBL) in the UV to far–infrared wavelength region is the repository of all energy releases in the universe since the epoch of recombination. It is also a source of opacity for TeV γ–ray sources. We briefly review the observational status of the EBL and discuss the uncertainties in its intensity at different wavelengths. The constraints on the EBL are used to p...
متن کاملWhy PRODIGY/EBL Works
Explanation-Based Learning (EBL) fails to accelerate problem solving in some problem spaces. How do these problem spaces differ from the ones in Minton’s experiments [1988b]? Can minute modifications to problem space encoding drastically alter EBL’s performance? Will PRODIGY/EBL'S success scale to real-world domains? This paper presents a formal theory of problem space structure that answers th...
متن کاملRelations between IB & EBL in Planning and
The ideas of intelligent backtracking (IB) and explanation based learning (EBL) have developed independently in constraint satisfaction, planning, machine learning and problem solving communities. The variety of approaches developed for IB and EBL in the various communities have hitherto been incomparable. In this paper, I formalize and unify these ideas under the task-independent framework of ...
متن کاملProbing the universe with the Lyman-alpha forest: III. The mean opacity of the IGM
I apply the well controlled Hydro-PM approximation of Gnedin & Hui to study the consistency between the column density distribution of the Lyman-alpha forest and the mean opacity of the IGM for 25 different flat cosmological scenarios, including variants of the standard CDM, tilted CDM, CDM with a cosmological constant, and CHDMmodels. I show that observational data of Press, Rybicki, and Schne...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2016
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stw2825