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Host Galaxies for Four Nearby CHIME/FRB Sources and the Local Universe FRB Host Galaxy Population
Authors:
Mohit Bhardwaj,
Daniele Michilli,
Aida Yu. Kirichenko,
Obinna Modilim,
Kaitlyn Shin,
Victoria M. Kaspi,
Bridget C. Andersen,
Tomas Cassanelli,
Charanjot Brar,
Shami Chatterjee,
Amanda M. Cook,
Fengqiu Adam Dong,
Emmanuel Fonseca,
B. M. Gaensler,
Adaeze L. Ibik,
J. F. Kaczmarek,
Adam E. Lanman,
Calvin Leung,
K. W. Masui,
Ayush Pandhi,
Aaron B. Pearlman,
Ziggy Pleunis,
J. Xavier Prochaska,
Masoud Rafiei-Ravandi,
Ketan R. Sand
, et al. (2 additional authors not shown)
Abstract:
We present the host galaxies of four apparently non-repeating fast radio bursts (FRBs), FRBs 20181223C, 20190418A, 20191220A, and 20190425A, reported in the first Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB) catalog. Our selection of these FRBs is based on a planned hypothesis testing framework where we search all CHIME/FRB Catalog-1 events that have low extragalactic dispersion meas…
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We present the host galaxies of four apparently non-repeating fast radio bursts (FRBs), FRBs 20181223C, 20190418A, 20191220A, and 20190425A, reported in the first Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB) catalog. Our selection of these FRBs is based on a planned hypothesis testing framework where we search all CHIME/FRB Catalog-1 events that have low extragalactic dispersion measure (< 100 pc cm$^{-3}$), with high Galactic latitude (|b| > 10$°$) and saved baseband data. We associate the selected FRBs to galaxies with moderate to high star-formation rates located at redshifts between 0.027 and 0.071. We also search for possible multi-messenger counterparts, including persistent compact radio and gravitational wave (GW) sources, and find none. Utilizing the four FRB hosts from this study along with the hosts of 14 published local Universe FRBs (z < 0.1) with robust host association, we conduct an FRB host demographics analysis. We find all 18 local Universe FRB hosts in our sample to be spirals (or late-type galaxies), including the host of FRB 20220509G, which was previously reported to be elliptical. Using this observation, we scrutinize proposed FRB source formation channels and argue that core-collapse supernovae are likely the dominant channel to form FRB progenitors. Moreover, we infer no significant difference in the host properties of repeating and apparently non-repeating FRBs in our local Universe FRB host sample. Finally, we find the burst rates of these four apparently non-repeating FRBs to be consistent with those of the sample of localized repeating FRBs observed by CHIME/FRB. Therefore, we encourage further monitoring of these FRBs with more sensitive radio telescopes.
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Submitted 15 October, 2023;
originally announced October 2023.
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The origin of low-redshift event rate excess as revealed by the low-luminosity GRBs
Authors:
X. F. Dong,
Z. B. Zhang,
Q. M. Li,
Y. F. Huang,
K. Bian
Abstract:
The relation between the event rate of long Gamma-Ray Bursts at low redshift and the star formation rate is still controversial, especially in the low-redshift end. Dong et al. confirmed that the Gamma-Ray Burst rate always exceeds the star formation rate at low-redshift of z < 1 in despite of the sample completeness. However, the reason of low-redshift excess is still unclear. Considering low-lum…
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The relation between the event rate of long Gamma-Ray Bursts at low redshift and the star formation rate is still controversial, especially in the low-redshift end. Dong et al. confirmed that the Gamma-Ray Burst rate always exceeds the star formation rate at low-redshift of z < 1 in despite of the sample completeness. However, the reason of low-redshift excess is still unclear. Considering low-luminosity bursts with smaller redshift generally, we choose three Swift long burst samples and classify them into low- and high-luminosity bursts in order to check whether the low-redshift excess is existent and if the excess is biased by the sample size and completeness. To degenerate the redshift evolution from luminosity, we adopt the non-parametric method to study the event rate of the two types of long bursts in each sample. It is found that the high-luminosity burst rates are consistent with the star formation rate within the whole redshift range while the event rates of low-luminosity bursts exceed the star formation rate at low redshift of z < 1. Consequently, we conclude that the low-redshift excess is contributed by the low-luminosity bursts with possibly new origins unconnected with the star formation, which is also independent of the sample size and the sample completeness.
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Submitted 11 September, 2023; v1 submitted 18 May, 2023;
originally announced May 2023.
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The pseudoscalar meson and baryon octet interaction in the unitary coupled-channel approximation
Authors:
Bao-Xi Sun,
Zheng-Ran Zhang,
Hai-Lin Wu,
Si-Yu Zhao,
Fang-Yong Dong
Abstract:
The pseudoscalar meson-baryon octet interaction is studied within a nonlinear realized Lagrangian, and then the Bethe-Salpeter equation is solved in the unitary coupled-channel approximation. In sector of strangeness $S=-1$ and isospin $I=0$, only one pole is generated dynamically in the 1400MeV region, which might correspond to the $Λ(1405)$ particle. When the case of strangeness zero is studied,…
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The pseudoscalar meson-baryon octet interaction is studied within a nonlinear realized Lagrangian, and then the Bethe-Salpeter equation is solved in the unitary coupled-channel approximation. In sector of strangeness $S=-1$ and isospin $I=0$, only one pole is generated dynamically in the 1400MeV region, which might correspond to the $Λ(1405)$ particle. When the case of strangeness zero is studied, the $s-$ and $u-$ potentials are taken into account in the kernel, and a resonance state is produced in the 1500MeV region, which might be a counterpart of the N(1535) particle.
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Submitted 25 December, 2019;
originally announced December 2019.
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Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
Authors:
G. Ambrosi,
Q. An,
R. Asfandiyarov,
P. Azzarello,
P. Bernardini,
B. Bertucci,
M. S. Cai,
J. Chang,
D. Y. Chen,
H. F. Chen,
J. L. Chen,
W. Chen,
M. Y. Cui,
T. S. Cui,
A. D'Amone,
A. De Benedittis,
I. De Mitri,
M. Di Santo,
J. N. Dong,
T. K. Dong,
Y. F. Dong,
Z. X. Dong,
G. Donvito,
D. Droz,
K. K. Duan
, et al. (133 additional authors not shown)
Abstract:
High energy cosmic ray electrons plus positrons (CREs), which lose energy quickly during their propagation, provide an ideal probe of Galactic high-energy processes and may enable the observation of phenomena such as dark-matter particle annihilation or decay. The CRE spectrum has been directly measured up to $\sim 2$ TeV in previous balloon- or space-borne experiments, and indirectly up to…
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High energy cosmic ray electrons plus positrons (CREs), which lose energy quickly during their propagation, provide an ideal probe of Galactic high-energy processes and may enable the observation of phenomena such as dark-matter particle annihilation or decay. The CRE spectrum has been directly measured up to $\sim 2$ TeV in previous balloon- or space-borne experiments, and indirectly up to $\sim 5$ TeV by ground-based Cherenkov $γ$-ray telescope arrays. Evidence for a spectral break in the TeV energy range has been provided by indirect measurements of H.E.S.S., although the results were qualified by sizeable systematic uncertainties. Here we report a direct measurement of CREs in the energy range $25~{\rm GeV}-4.6~{\rm TeV}$ by the DArk Matter Particle Explorer (DAMPE) with unprecedentedly high energy resolution and low background. The majority of the spectrum can be properly fitted by a smoothly broken power-law model rather than a single power-law model. The direct detection of a spectral break at $E \sim0.9$ TeV confirms the evidence found by H.E.S.S., clarifies the behavior of the CRE spectrum at energies above 1 TeV and sheds light on the physical origin of the sub-TeV CREs.
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Submitted 29 November, 2017;
originally announced November 2017.
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The Lambda(1405) state in a chiral unitary approach with off-shell corrections to dimensional regularized loop functions
Authors:
Fang-Yong Dong,
Bao-Xi Sun,
Jing-Long Pang
Abstract:
The Bethe-Salpeter equation is solved in the framework of unitary coupled-channel approximation by using the pseudoscalar meson-baryon octet interaction. The loop function of the intermediate meson and baryon is deduced in a dimensional regularization scheme, where the relativistic kinetic effect and off-shell corrections are taken into account. According to the experimental data at the $K^- p$ th…
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The Bethe-Salpeter equation is solved in the framework of unitary coupled-channel approximation by using the pseudoscalar meson-baryon octet interaction. The loop function of the intermediate meson and baryon is deduced in a dimensional regularization scheme, where the relativistic kinetic effect and off-shell corrections are taken into account. According to the experimental data at the $K^- p$ threshold, the subtraction constants in the loop function are determined. The squared amplitude is suppressed strongly and only one $Λ(1405)$ state is generated dynamically in the strangeness $S=-1$ and isospin $I=0$ sector.
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Submitted 27 April, 2017; v1 submitted 27 September, 2016;
originally announced September 2016.