B. Zhang. (2020)cite arxiv:2011.09921Comment: 4 pages, submitted to ApJL.
Аннотация
Recently, one fast radio burst, FRB 200428, was detected from the Galactic
magnetar SGR J1935+2154 during one X-ray burst. This suggests that magnetars
can make FRBs. On the other hand, the majority of X-ray bursts from SGR
J1935+2154 are not associated with FRBs. One possible reason of such rarity of
FRB-SGR-burst associations is that the FRB emission is much more narrowly
beamed than SGR burst emission. If such an interpretation is true, one would
expect to detect radio bursts with viewing angle somewhat outside the narrow
emission beam. These "slow" radio bursts (SRBs) would have broader widths and
lower flux densities due to the smaller Doppler factor involved. The $2.2$-s
long, 111 MHz radio burst detected from SGR J1935+2154 by the BSA LPI radio
telescope may be such an SRB if the spectral slope is positive. If the FRB beam
is narrow, there should be many more SRBs than FRBs from Galactic magnetars.
Non-detection of these SRBs would disfavor the assumption that all SGR bursts
are associated with narrow-beam FRBs.
%0 Generic
%1 zhang2020radio
%A Zhang, Bing
%D 2020
%K tifr
%T "Slow" Radio Bursts from Galactic Magnetars?
%U http://arxiv.org/abs/2011.09921
%X Recently, one fast radio burst, FRB 200428, was detected from the Galactic
magnetar SGR J1935+2154 during one X-ray burst. This suggests that magnetars
can make FRBs. On the other hand, the majority of X-ray bursts from SGR
J1935+2154 are not associated with FRBs. One possible reason of such rarity of
FRB-SGR-burst associations is that the FRB emission is much more narrowly
beamed than SGR burst emission. If such an interpretation is true, one would
expect to detect radio bursts with viewing angle somewhat outside the narrow
emission beam. These "slow" radio bursts (SRBs) would have broader widths and
lower flux densities due to the smaller Doppler factor involved. The $2.2$-s
long, 111 MHz radio burst detected from SGR J1935+2154 by the BSA LPI radio
telescope may be such an SRB if the spectral slope is positive. If the FRB beam
is narrow, there should be many more SRBs than FRBs from Galactic magnetars.
Non-detection of these SRBs would disfavor the assumption that all SGR bursts
are associated with narrow-beam FRBs.
@misc{zhang2020radio,
abstract = {Recently, one fast radio burst, FRB 200428, was detected from the Galactic
magnetar SGR J1935+2154 during one X-ray burst. This suggests that magnetars
can make FRBs. On the other hand, the majority of X-ray bursts from SGR
J1935+2154 are not associated with FRBs. One possible reason of such rarity of
FRB-SGR-burst associations is that the FRB emission is much more narrowly
beamed than SGR burst emission. If such an interpretation is true, one would
expect to detect radio bursts with viewing angle somewhat outside the narrow
emission beam. These "slow" radio bursts (SRBs) would have broader widths and
lower flux densities due to the smaller Doppler factor involved. The $2.2$-s
long, 111 MHz radio burst detected from SGR J1935+2154 by the BSA LPI radio
telescope may be such an SRB if the spectral slope is positive. If the FRB beam
is narrow, there should be many more SRBs than FRBs from Galactic magnetars.
Non-detection of these SRBs would disfavor the assumption that all SGR bursts
are associated with narrow-beam FRBs.},
added-at = {2020-11-20T07:29:16.000+0100},
author = {Zhang, Bing},
biburl = {https://www.bibsonomy.org/bibtex/24c09e2ce6941a8cab5e00cd2970886c4/citekhatri},
description = {"Slow" Radio Bursts from Galactic Magnetars?},
interhash = {d6ef62334ac1e207ce43a4dc2b62599d},
intrahash = {4c09e2ce6941a8cab5e00cd2970886c4},
keywords = {tifr},
note = {cite arxiv:2011.09921Comment: 4 pages, submitted to ApJL},
timestamp = {2020-11-20T07:29:16.000+0100},
title = {"Slow" Radio Bursts from Galactic Magnetars?},
url = {http://arxiv.org/abs/2011.09921},
year = 2020
}