Origins of short gamma-ray bursts deduced from offsets in their host galaxies revisited

Cui, Xiaohong; Nagataki, Shigehiro; Aoi, Junichi; Xu, R. X.

doi:10.1088/1674-4527/12/9/006

Cited by 6 publications

(3 citation statements)

References 52 publications

(97 reference statements)

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“…They suggested a set of multiwavelength criteria to diagnose the physical origin of GRBs (see also Kann et al 2011), and suspected that some, maybe most high-redshift high-luminosity short GRBs would be of a Type II origin. This conclusion was later also drawn by several groups independently based on very different arguments (Virgili et al 2011;Cui et al 2012;Bromberg et al 2012).…”

Section: Introductionmentioning

confidence: 63%

The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification

Lü¹,

Zhang²,

Liang³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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Traditionally gamma-ray bursts (GRBs) are classified in the T 90 -hardness ratio twodimensional plane into long/soft and short/hard GRBs. In this paper, we suggest to add the "amplitude" of GRB prompt emission as the third dimension as a complementary criterion to classify GRBs, especially those of short durations. We define three new parameters f , f eff and f eff,z as ratios between the measured/simulated peak flux of a GRB/pseudo-GRB and the flux background, and discuss the applications of these parameters to GRB classification. We systematically derive these parameters to find that most short GRBs are likely not "tip-of-iceberg" of long GRBs. However, one needs to be cautious if a short GRB has a relatively small f (e.g. f < 1.5), since the chance for an intrinsically long GRB to appear as a "disguised" short GRB is higher. Based on avaialble data, we quantify the probability of a disguised short GRB below a certain f value is as P (< f ) ∼ 0.78 +0.71−0.4 f −4.33±1.84 . By progressively "moving" a long GRB to higher redshifts through simulations, we also find that most long GRBs would show up as rest-frame short GRBs above a certain redshift.

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Section: Introductionmentioning

confidence: 63%

The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification

Lü¹,

Zhang²,

Liang³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…SHGRB do not have a strong bias that would affect the rate in our galaxy, but they display some preference for older stellar populations. Based on Nakar (2007), we could set b ~ 0.5, but more recent results would suggest b =1 (no bias; Cui et al 2010). We assume typical peaks in the spectral emission around 800 keV, with energy of about 10 43 J, and a rate of about 40 Gpc -3 yr -1 .…”

Section: Gamma-ray Bursts (A) Grb Scalingmentioning

confidence: 99%

Astrophysical Ionizing Radiation and Earth: A Brief Review and Census of Intermittent Intense Sources

2011

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Cosmic radiation backgrounds are a constraint on life, and their distribution will affect the Galactic Habitable Zone. Life on Earth has developed in the context of these backgrounds, and characterizing event rates will elaborate the important influences. This in turn can be a base for comparison with other potential life-bearing planets. In this review we estimate the intensities and rates of occurrence of many kinds of strong radiation bursts by astrophysical entities ranging from gamma-ray bursts at cosmological distances to the Sun itself. Many of these present potential hazards to the biosphere: on timescales long compared with human history, the probability of an event intense enough to disrupt life on the land surface or in the oceans becomes large. Both photons (e.g. X-rays) and high-energy protons and other nuclei (often called "cosmic rays") constitute hazards. For either species, one of the mechanisms which comes into play even at moderate intensities is the ionization of the Earth's atmosphere, which leads through chemical changes (specifically, depletion of stratospheric ozone) to increased ultraviolet-B flux from the Sun reaching the surface. UVB is extremely hazardous to most life due to its strong absorption by the genetic material DNA and subsequent breaking of chemical bonds. This often leads to mutation and/or cell death. It is easily lethal to the microorganisms that lie at the base of the food chain in the ocean. We enumerate the known sources of radiation and characterize their intensities at the Earth and rates or upper limits on these quantities. When possible, we estimate a "lethal interval," our best estimate of how often a major extinction-level event is probable given the current state of knowledge; we base these estimates on computed or expected depletion of stratospheric ozone. In general, moderate level events are dominated by the Sun, but the far more severe infrequent events are probably 2 dominated by gamma-ray bursts and supernovae. We note for the first time that socalled "short-hard" gamma-ray bursts are a substantial threat, comparable in magnitude to supernovae and greater than that of the higher-luminosity long bursts considered in most past work. Given their precursors, short bursts may come with little or no warning.

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“…From OGLE, we collect 2083 and 674 RRd stars belonging to the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC), respectively. Metallicity information for these stars is taken from low-resolution spectra of the Sloan Digital Sky Survey (SDSS, Eisenstein et al 2011) and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, Cui et al 2012). After crossmatching, we obtain 100 RRd stars with SDSS or LAMOST metallicities.…”

Section: Period-metallicity Relationmentioning

confidence: 99%

Double-mode RR Lyrae star — robust distance and metallicity indicators

Wang,

Chen,

Zhang

et al. 2022

Proc. IAU

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RR Lyrae (RR Lyr) stars are a well-known and useful distance indicator for old stellar populations such as globular clusters and dwarf galaxies. Fundamental-mode RR Lyr (RRab) stars are commonly used to measure distances, and the accuracy of the determined distance is strongly constrained by metallicity. Here, we investigate the metallicity dependence in the period–luminosity (PL) relation of double-mode RR Lyr (RRd) stars. We find and establish a linear relation between metallicity and period or period ratio for RRd stars. This relation can predict the metallicity as accurately as the low-resolution spectra. Based on this relation, we establish a metallicity-independent PL relation for RRd stars. Combining the distance of the Large Magellanic Cloud and Gaia parallaxes, we calibrate the zero point of the derived PL relation to an error of 0.022 mag. Using RRd stars, we measure the distances of globular clusters and dwarf galaxies with an accuracy of 2-3% and 1-2%, respectively. In the future, RRd stars could anchor galaxy distances to an accuracy of 1.0% and become an independent distance ladder in the Local Group.

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Origins of short gamma-ray bursts deduced from offsets in their host galaxies revisited

Cited by 6 publications

References 52 publications

The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification

The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification

Astrophysical Ionizing Radiation and Earth: A Brief Review and Census of Intermittent Intense Sources

Double-mode RR Lyrae star — robust distance and metallicity indicators

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