Observations of fast radio bursts at frequencies down to 400 megahertz

被引：180

作者：

Amiri, M. ^{[1
]}

Bandura, K. ^{[2
,3
]}

Bhardwaj, M. ^{[4
,5
]}

Boubel, P. ^{[4
,5
]}

Boyce, M. M. ^{[6
]}

Boyle, P. J. ^{[4
,5
]}

Brar, C. ^{[4
,5
]}

Burhanpurkar, M. ^{[7
]}

Chawla, P. ^{[4
,5
]}

Cliche, J. F. ^{[4
,5
]}

Cubranic, D. ^{[1
]}

Deng, M. ^{[1
]}

Denman, N. ^{[8
,9
]}

Dobbs, M. ^{[4
,5
]}

Fandino, M. ^{[1
]}

Fonseca, E. ^{[4
,5
]}

Gaensler, B. M. ^{[8
,9
]}

Gilbert, A. J. ^{[4
,5
]}

Giri, U. ^{[10
,11
]}

Good, D. C. ^{[1
]}

Halpern, M. ^{[1
]}

Hanna, D. ^{[4
,5
]}

Hill, A. S. ^{[1
,12
,13
]}

Hinshaw, G. ^{[1
]}

Hofer, C. ^{[1
]}

Josephy, A. ^{[4
,5
]}

Kaspi, V. M. ^{[4
,5
]}

Landecker, T. L. ^{[12
]}

Lang, D. A. ^{[10
,11
]}

Masui, K. W. ^{[14
,15
]}

Mckinven, R. ^{[8
,9
]}

Mena-Parra, J. ^{[4
,5
,14
]}

Merryfield, M. ^{[4
,5
]}

Milutinovic, N. ^{[1
,12
]}

Moatti, C. ^{[4
,5
]}

Naidu, A. ^{[4
,5
]}

Newburgh, L. B. ^{[16
]}

Ng, C. ^{[8
]}

Patel, C. ^{[4
,5
]}

Pen, U. ^{[17
]}

Pinsonneault-Marotte, T. ^{[1
]}

Pleunis, Z. ^{[4
,5
]}

Rafiei-Ravandi, M. ^{[10
]}

Ransom, S. M. ^{[18
]}

Renard, A. ^{[8
]}

Scholz, P. ^{[12
]}

Shaw, J. R. ^{[1
,12
]}

Siegel, S. R. ^{[4
,5
]}

Smith, K. M. ^{[10
]}

Stairs, I. H. ^{[1
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC, Canada

[2] West Virginia Univ, CSEE, Morgantown, WV USA

[3] West Virginia Univ, Ctr Gravitat Waves & Cosmol, Morgantown, WV USA

[4] McGill Univ, Dept Phys, Montreal, PQ, Canada

[5] McGill Univ, McGill Space Inst, Montreal, PQ, Canada

[6] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB, Canada

[7] Harvard Univ, Cambridge, MA 02138 USA

[8] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON, Canada

[9] Univ Toronto, Dept Astron & Astrophys, Toronto, ON, Canada

[10] Perimeter Inst Theoret Phys, Waterloo, ON, Canada

[11] Univ Waterloo, Dept Phys & Astron, Waterloo, ON, Canada

[12] Natl Res Council Canada, Herzberg Astron & Astrophys Res Ctr, Domin Radio Astrophys Observ, Penticton, BC, Canada

[13] Space Sci Inst, Boulder, CO USA

[14] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[15] MIT, Dept Phys, Cambridge, MA 02139 USA

[16] Yale Univ, Dept Phys, New Haven, CT USA

[17] Canadian Inst Theoret Astrophys, Toronto, ON, Canada

[18] Natl Radio Astron Observ, Charlottesville, VA USA

[19] Univ Toronto, Dept Phys, Toronto, ON, Canada

来源：

NATURE | 2019年 / 566卷 / 7743期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

REIONIZATION HISTORY; POPULATION; LIMITS; MHZ;

D O I：

10.1038/s41586-018-0867-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Fast radio bursts (FRBs) are highly dispersed millisecond-duration radio flashes probably arriving from far outside the Milky Way(1,2). This phenomenon was discovered at radio frequencies near 1.4 gigahertz and so far has been observed in one case(3) at as high as 8 gigahertz, but not at below 700 megahertz in spite of substantial searches at low frequencies(4-7). Here we report detections of 13 FRBs at radio frequencies as low as 400 megahertz, on the Canadian Hydrogen Intensity Mapping Experiment (CHIME) using the CHIME/FRB instrument(8). They were detected during a telescope pre-commissioning phase, when the sensitivity and field of view were not yet at design specifications. Emission in multiple events is seen down to 400 megahertz, the lowest radio frequency to which the telescope is sensitive. The FRBs show various temporal scattering behaviours, with the majority detectably scattered, and some apparently unscattered to within measurement uncertainty even at our lowest frequencies. Of the 13 reported here, one event has the lowest dispersion measure yet reported, implying that it is among the closest yet known, and another has shown multiple repeat bursts, as described in a companion paper(9). The overall scattering properties of our sample suggest that FRBs as a class are preferentially located in environments that scatter radio waves more strongly than in the diffuse interstellar medium in the Milky Way.

引用

页码：230 / +

页数：10

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