期刊
ASTROPARTICLE PHYSICS
卷 43, 期 -, 页码 317-330出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2012.05.020
关键词
Survey; Gamma ray
资金
- European Community [ERC-StG-200911]
- Spanish MICINN [FPA2010-22056-C06-06]
- Spanish MICINN
- European Union [262053]
- Ministerio de Ciencia, Tecnologia e Innovacion Productiva (MinCyT), Argentina
- Comision Nacional de Energia Atomica (CNEA), Argentina
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) Argentina
- State Committee of Science of Armenia
- Ministry for Research, France
- CNRS-INSU, France
- CNRS-IN2P3, France
- Irfu-CEA, France
- ANR, France
- Max Planck Society, Germany
- BMBF, Germany
- DESY, Germany
- Helmholtz Association, Germany
- MIUR, Italy
- Netherlands Research School for Astronomy (NOVA)
- Netherlands Organization for Scientific Research (NWO)
- Ministry of Science and Higher Education, Poland
- National Centre for Research and Development, Poland
- MICINN, Spain
- CPAN, Spain
- MultiDark Consolider-Ingenio programme, Spain
- Swedish Research Council, Sweden
- Royal Swedish Academy of Sciences, Sweden
- Swiss National Science Foundation (SNSF), Switzerland
- Leverhulme Trust, UK
- Royal Society, UK
- Science and Technologies Facilities Council, UK
- Durham University, UK
- National Science Foundation, USA
- Department of Energy, USA
- Argonne National Laboratory, USA
- University of California, USA
- University of Chicago, USA
- Iowa State University, USA
- Institute for Nuclear and Particle Astrophysics (INPAC-MRPI), USA
- Washington University McDonnell Center for the Space Sciences, USA
- Science and Technology Facilities Council [ST/J00426X/1 CTA] Funding Source: researchfish
Surveys open up unbiased discovery space and generate legacy datasets of long-lasting value. One of the goals of imaging arrays of Cherenkov telescopes like CTA is to survey areas of the sky for faint very high energy gamma-ray (VHE) sources, especially sources that would not have drawn attention were it not for their VHE emission (e.g. the Galactic dark accelerators). More than half the currently known VHE sources are to be found in the Galactic Plane. Using standard techniques, CTA can carry out a survey of the region vertical bar l vertical bar <= 60 degrees, vertical bar b vertical bar <= 2 degrees in 250 h (1/4th the available time per year at one location) down to a uniform sensitivity of 3 mCrab (a Galactic Plane survey). CTA could also survey 1/4th of the sky down to a sensitivity of 20 mCrab in 370 h of observing time (an all-sky survey), which complements well the surveys by the Fermi/LAT at lower energies and extended air shower arrays at higher energies. Observations in (non-standard) divergent pointing mode may shorten the all-sky survey time to about 100 h with no loss in survey sensitivity. We present the scientific rationale for these surveys, their place in the multi-wavelength context, their possible impact and their feasibility. We find that the Galactic Plane survey has the potential to detect hundreds of sources. Implementing such a survey should be a major goal of CTA. Additionally, about a dozen blazars, or counterparts to Fermi/LAT sources, are expected to be detected by the all-sky survey, whose prime motivation is the search for extragalactic dark accelerators. (C) 2012 Elsevier B.V. All rights reserved.
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