The Cosmic Dispersion Measure from Gamma-Ray Burst Afterglows: Probing the Reionization History and the Burst Environment

By K. Ioka. 2003

228 citations recorded by the source corpus.

We show a possible way to measure the column density of free electrons along the light path, the so-called dispersion measure (DM), from the early [~415(ν/1 GHz)-2(DM/105 pc cm-3) s] radio afterglows of the gamma-ray bursts. We find that the proposed Square Kilometer Array can detect bright radio afterglows around the time ~103(ν/160 MHz)-2 s to measure the intergalactic DM (≳6000 pc cm-3 at redshift z > 6) up to z ~ 30, from which we can determine the reionization history of the universe and identify the missing warm-hot baryons if many DMs can be measured. At low z, the DM in the host galaxy may reach ~105 pc cm-3 depending on the burst environment, which may be probed by the current detectors. Free-free absorption and diffractive scattering may also affect the radio emission at a high density.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Pulmonary and Respiratory Medicine

View Paper: https://www.semanticscholar.org/paper/283fdd1395447e58b6fe607967e372552f1acc28

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Citations in the corpus

FRBCAT: The Fast Radio Burst Catalogue (2016, methodology): “The redshift is calculated as z = DMexcess/1200 pc cm−3 from estimates of the intergalactic medium (IGM) electron density from Ioka (2003).”
The Host Galaxies and Progenitors of Fast Radio Bursts Localized with the Australian Square Kilometre Array Pathfinder (2020, background): “Based on models of the intergalactic medium [3], their large dispersion measures (DMs) imply that they originate at redshifts z ∼ 0.”
COSMOLOGICAL IMPLICATIONS OF FAST RADIO BURST/GAMMA-RAY BURST ASSOCIATIONS (2013, background): “Ioka (2003) and Inoue (2004) have derived some equations of DMIGM for a fully ionized, pure hydrogen plasma.”
LOCATING THE “MISSING” BARYONS WITH EXTRAGALACTIC DISPERSION MEASURE ESTIMATES (2013, background): “Previous theoretical investigations of the uses of extragalactic DM measurements assumed a homogeneous universe (Ioka 2003; Inoue 2004).”
A FAST RADIO BURST IN THE DIRECTION OF THE CARINA DWARF SPHEROIDAL GALAXY (2014, background): “In this case, the distances inferred from the values of ∆DM are & 1Gpc in the absence of significant host contributions (Ioka 2003).”
Constraints on the distribution and energetics of fast radio bursts using cosmological hydrodynamic simulations (2014, unknown): “1 (Ioka 2003; Lorimer et al. 2007; Thornton et al. 2013).”
A Multi-telescope Campaign on FRB 121102: Implications for the FRB Population (2017, background): “…Rate of FRB Sources Thornton et al. (2013) estimated an isotropic rate of FRB events of 10−3 galaxy−1 yr−1 by calculating the number of Milky Way-type galaxies out to a distance implied by assming all extragalactic DM originates in the IGM (z ≈ 0.9 for DM≈ z× 900 pc cm−3; Ioka 2003; Inoue 2004).”
A burst in a wind bubble and the impact on baryonic ejecta: high-energy gamma-ray flashes and afterglows from fast radio bursts and pulsar-driven supernova remnants (2016, background): “If the dispersion originates mainly from the intergalactic propagation (Ioka 2003; Inoue 2004), the sources can be at cosmological distance up to z ∼ 1 (but see, e.g., Loeb, Shvartzvald & Maoz 2014; Maoz et al. 2015), and a high brightness temperature requires a coherent emission mechanism (e.g.,…”
Probing the cosmic reionization history and local environment of gamma‐ray bursts through radio dispersion (2003, unknown): “We conclude in §6 along with remarks on † A similar study has recently been carried out by Ioka (2003). future prospects.”
Fast radio bursts: search sensitivities and completeness (2014, unknown): “…2012; Bannister & Madsen 2014): we use this to gauge a reasonable uncertainty in the maximum Milky Way contribution to each event’s DM. Subtracting this contribution one can invoke a model relating DM and redshift (Ioka 2003; Inoue 2004) to derive an upper limit redshift estimate for each event.”
A real-time fast radio burst: polarization detection and multiwavelength follow-up (2014, background): “…& Lazio 2002), only 6% of the total, which sets an upper limit on redshift z 0.4(1) based on ionization models of the intergalactic medium (IGM), making no assumptions about a host contribution to the total DM, and assuming an upper limit on the Galactic DM contribution of 70 pc cm−3 (Ioka 2003).”
The SUrvey for Pulsars and Extragalactic Radio Bursts – II. New FRB discoveries and their follow-up. (2017, methodology): “FRB 160102 is the highest DM FRB yet observed with DM = 2596.1 ± 0.3 pc cm−3, and has an inferred luminosity distance of 17 Gpc, assuming the nominal redshift z = 2.1 from the models of Ioka (2003) and Inoue (2004) for the observed DM excess.”
COSMOLOGICAL FAST RADIO BURSTS FROM BINARY WHITE DWARF MERGERS (2013, methodology): “By combining the dispersion measure of the FRBs, one could put unique constraints on cosmological parameters (since the luminosity distance and the dispersion measure have different dependences on the redshift) and the cosmological reionization history (Ioka 2003; Inoue 2004).”
The Search for the Missing Baryons at Low Redshift (2007, unknown): “Ioka (2003) has examined this possibility and discussed that it may be feasible with a future instrument such as the Square Kilometer Array.”
The First Cosmic Structures and Their Effects (2004, background): “High-energy neutrinos from Pop III GRBs could dominate the overall flux in two energy bands, 104 − 105 GeV and 105 − 106 GeV, of neutrino telescopes.”