CRAFTS for Fast Radio Bursts Extending the dispersion-fluence relation with new FRBs detected by FAST
| Autor: | Zhang Xinxin, Jia Rui Niu, Lei Zhang, Youling Yue, Weiwei Zhu, Yong Kun Zhang, Lei Qian, Ning Yu Tang, Jumei Yao, Yi Feng, Chen Hui Niu, Di Li, Marko Krčo, Mengyao Xue, Shi Dai, Rui Luo, Haoyang Ye, Weiyang Wang, Bing Zhang, Pei Wang, Mao Yuan, Zhichen Pan, Chenchen Miao, Ran Duan |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) education.field_of_study 010504 meteorology & atmospheric sciences Low fluence media_common.quotation_subject Population FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Fluence Radio telescope Space and Planetary Science Sky 0103 physical sciences Dispersion (optics) education Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Luminosity function 0105 earth and related environmental sciences Radio astronomy media_common |
| DOI: | 10.48550/arxiv.2102.10546 |
| Popis: | We report three new FRBs discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), namely FRB 181017.J0036+11, FRB 181118 and FRB 181130, through the Commensal Radio Astronomy FAST Survey (CRAFTS). Together with FRB 181123 that was reported earlier, all four FAST-discovered FRBs share the same characteristics of low fluence ($\leq$0.2 Jy ms) and high dispersion measure (DM, $>1000$ \dmu), consistent with the anti-correlation between DM and fluence of the entire FRB population. FRB 181118 and FRB 181130 exhibit band-limited features. FRB 181130 is prominently scattered ($��_s\simeq8$ ms) at 1.25 GHz. FRB 181017.J0036+11 has full-bandwidth emission with a fluence of 0.042 Jy ms, which is one of the faintest FRB sources detected so far. CRAFTS starts to built a new sample of FRBs that fills the region for more distant and fainter FRBs in the fluence-$\rm DM_E$ diagram, previously out of reach of other surveys. The implied all sky event rate of FRBs is $1.24^{+1.94}_{-0.90} \times 10^5$ sky$^{-1}$ day$^{-1}$ at the $95\%$ confidence interval above 0.0146 Jy ms. We also demonstrate here that the probability density function of CRAFTS FRB detections is sensitive to the assumed intrinsic FRB luminosity function and cosmological evolution, which may be further constrained with more discoveries. 9 Pages, 4 Plots and 1 Table. The Astrophysical Journal Letter Accepted |
| Databáze: | OpenAIRE |
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