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Intensity distribution function and statistical properties of fast radio bursts

Research in Astronomy and Astrophysics 2017年第1期17卷 71-80页

作者： Long-Biao Li Yong-Feng Huang Zhi-Bin Zhang Di Li Bing Li School of Astronomy and Space Science Nanjing University Nanjing 210046 China Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education Nanjing210046 China Department of Physics College of Sciences Guizhou University Guiyang 550025 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Key Laboratory for Radio Astronomy Chinese Academy of Sciences Nanjing 210008 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

Fast Radio Bursts （FRBs） are intense radio flashes from the sky that are characterized by mil- lisecond durations and Jansky-level flux densities. We carried out a statistical analysis on FRBs that have been discovered. Their mean dispersion measure, after subtracting the contribution from the interstellar medium of our Galaxy, is found to be ~ 660 pc cm-3, supporting their being from a cosmological origin. Their energy released in the radio band spans about two orders of magnitude, with a mean value of ~ 10-39 erg. More interestingly, although the study of FRBs is still in a very early phase, the published collection of FRBs enables us to derive a useful intensity distribution function. For the 16 non-repeating FRBs detected by the Parkes telescope and the Green Bank Telescope, the intensity distribution can be described as dN/dFobs = （4.1± 1.3） × 103 F-obs1.1±0.2 sky-1 d-l, where Fobs is the observed radio obs fluence in units of Jy ms. Here the power-law index is significantly flatter than the expected value of 2.5 for standard candles distributed homogeneously in a flat Euclidean space. Based on this intensity distribution function, the Five-hundred-meter Aperture Spherical radio Telescope （FAST） is predicted to be able to detect about five FRBs for every 1000 h of observation time.

关键词： pulsars general - stars neutron - radio continuum general - intergalactic medium -methods statistical

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