The Rees-Sciama effect and the primordial nucleosynthesis

Mészáros, A.

doi:10.1051/0004-6361:20020371

Cited by 55 publications

(79 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although (sub-)GeV flashes in GRB afterglows could arise in other scenarios (e.g. Mészáros & Rees 1994;Plaga 1995;Granot & Guetta 2003;Dermer & Atoyan 2004;Beloborodov 2005;Fan, Zhang & Wei 2005a), the high-energy photon flashes predicted in this Letter can be distinguished easily since they follow the high-energy (soft X-ray) tail of the FUV flares (see also Wang, Li & Mészáros 2006), which is unexpected in any alternative model. Our prediction could be tested by the cooperation of Swift and GLAST.…”

Section: Introductionmentioning

confidence: 55%

“…A new spectral component in the energy range larger than several tens of MeV is needed. Possible models include the interaction of ultrarelativistic protons with a dense cloud (Katz 1994), SSC scattering in early forward and reverse shocks (Mészáros & Rees 1994), and an electromagnetic cascade of TeV γ -rays in the infrared/microwave background (Plaga 1995).…”

Section: P O S S I B L E C a N D I Dat E S F O R T H E P R E D I C T mentioning

confidence: 99%

See 1 more Smart Citation

Sub-GeV flashes in γ-ray burst afterglows as probes of underlying bright far-ultraviolet flares

Fan

Piran

2006

Monthly Notices of the Royal Astronomical Society: Letters

View full text Add to dashboard Cite

Bright optical and X‐ray flares have been observed in many γ‐ray burst (GRB) afterglows. These flares have been attributed to late activity of the central engine. In most cases the peak energy is not known and it is possible and even likely that there is a significant far‐ultraviolet component. These far‐ultraviolet photons escape our detection because they are absorbed by the neutral hydrogen before reaching Earth. However, these photons cross the blast wave produced by the ejecta that has powered the initial GRB. They can be inverse Compton upscattered by hot electrons within this blast wave. This process will produce a strong sub‐GeV flare that follows the high‐energy (soft X‐ray) tail of the far‐ultraviolet flare but lasts much longer and can be detected by the upcoming Gamma‐ray Large Area Space Telescope (GLAST) satellite. This signature can be used to probe the spectrum of the underlying far‐ultraviolet flare. The extra cooling produced by this inverse Compton process can lower the X‐ray emissivity of the forward shock and explain the unexpected low, early X‐ray flux seen in many GRBs.

show abstract

Section: Introductionmentioning

confidence: 55%

Section: P O S S I B L E C a N D I Dat E S F O R T H E P R E D I C T mentioning

confidence: 99%

Sub-GeV flashes in γ-ray burst afterglows as probes of underlying bright far-ultraviolet flares

Fan

Piran

2006

Monthly Notices of the Royal Astronomical Society: Letters

View full text Add to dashboard Cite

show abstract

“…It is not clear if the supercollapsar bursts will also exhibit the fine substructure characteristic of normal GRBs. If the variability of normal GRBs is due to internal shocks in baryondominated flow, as this is proposed in the currently most popular model of prompt gamma-ray emission (Mésźaros & Rees 1994), then the supercollapsar burst produced by the magnetically dominated BZ jet may well be smooth and featureless. However, there are models of normal GRBs that attribute the observed variability to unsteady magnetic dissipation (Lyutikov & Blandford 2003;Giannios et al 2009;Kumar & Narayan 2009).…”

Section: O B S E Rvat I O Na L S I G Nat U R E Smentioning

confidence: 99%

Supercollapsars and their X-ray bursts

Komissarov

Barkov

2010

Monthly Notices of the Royal Astronomical Society: Letters

View full text Add to dashboard Cite

The very first stars in the Universe can be very massive, up to 103 M⊙. If born in large numbers, such massive stars can have a strong impact on the subsequent star formation, producing strong ionizing radiation and contaminating the primordial gas with heavy elements. They would leave behind massive black holes that could act as seeds for growing supermassive black holes of active galactic nuclei. Given the anticipated fast rotation, such stars would end their life as supermassive collapsars and drive powerful magnetically dominated jets. In this Letter, we investigate the possibility of observing the bursts of high‐energy emission similar to the long gamma‐ray bursts associated with normal collapsars. We show that during the collapse of supercollapsars, the Blandford–Znajek mechanism can produce jets as powerful as few ×1052 erg s−1 and release up to 1054 erg of the black hole rotational energy. Due to the higher intrinsic time‐scale and higher redshift, the initial bright phase of the burst can last for about 104 s, whereas the central engine would remain active for about 1 d. Due to the high redshift the burst spectrum is expected to be soft, with the spectral energy distribution peaking at around 20–30 keV. The peak total flux density is relatively low, 10−7 erg cm−2 s−1, but not prohibitive. If one supercollapsar is produced per every minihalo of dark matter arising from the 3σ cosmological fluctuations, then the whole sky frequency of such bursts could reach several tens per year.

show abstract

“…A number of different proposals have been put forward for the generation of high‐energy photons in GRBs. For instance, one possible mechanism is the synchrotron process – either electron or proton synchrotron – for example Meszaros & Rees (1994), Totani (1998) and Zhang & Meszaros (2001). Another possibility is inverse‐Compton scattering of lower energy photons produced in the same region (such as the synchrotron‐self‐Compton process) or of an external origin for example Meszaros & Rees (1994), Pilla & Loeb (1998), Dermer, Chiang & Mitman (2000), Sari & Esin (2001), Wang, Dai & Lu (2001a,b), Zhang & Meszaros (2001), Granot & Guetta (2003), Guetta & Granot (2003), Piran, Nakar & Granot (2004), Beloborodov (2005), Fan, Zhang & Wei (2005), Fan et al (2008), Fan & Piran (2006), Wang, Li & Meszaros (2006), Galli & Guetta (2008) and Zou, Fan & Piran (2009).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, one possible mechanism is the synchrotron process – either electron or proton synchrotron – for example Meszaros & Rees (1994), Totani (1998) and Zhang & Meszaros (2001). Another possibility is inverse‐Compton scattering of lower energy photons produced in the same region (such as the synchrotron‐self‐Compton process) or of an external origin for example Meszaros & Rees (1994), Pilla & Loeb (1998), Dermer, Chiang & Mitman (2000), Sari & Esin (2001), Wang, Dai & Lu (2001a,b), Zhang & Meszaros (2001), Granot & Guetta (2003), Guetta & Granot (2003), Piran, Nakar & Granot (2004), Beloborodov (2005), Fan, Zhang & Wei (2005), Fan et al (2008), Fan & Piran (2006), Wang, Li & Meszaros (2006), Galli & Guetta (2008) and Zou, Fan & Piran (2009). Yet another class of high‐energy photon generation mechanism is hadronic collisions and photo‐pion production for example Katz (1994), Derishev, Kocharovsky & Kocharovsky (1999), Bahcall & Meszaros (2000), Dermer & Atoyan (2004), Razzaque & Meszaros (2006), Gupta & Zhang (2007) and Fan & Piran (2008).…”

Section: Introductionmentioning

confidence: 99%

On the generation of high-energy photons detected by the Fermi Satellite from gamma-ray bursts

Kumar

Duran

2009

Monthly Notices of the Royal Astronomical Society: Letters

242

236

View full text Add to dashboard Cite

Observations of gamma‐ray bursts by the Fermi satellite, capable of detecting photons in a very broad energy band: 8 keV to >300 GeV, have opened a new window for the study of these enigmatic explosions. It is widely assumed that photons of energy larger than 100 MeV are produced by the same source that generated lower energy photons – at least whenever the shape of the spectrum is a Band function. We report here a surprising result – the Fermi data for a bright burst, GRB 080916C, unambiguously shows that the high‐energy photons (≳102 MeV) were generated in the external shock via the synchrotron process, and the lower energy photons had a distinctly different source. The magnetic field in the region where high‐energy photons were produced (and also the late‐time afterglow emission region) is found to be consistent with shock compressed magnetic field of the circum‐stellar medium. This result sheds light on the important question of the origin of magnetic fields required for gamma‐ray burst afterglows. The external shock model for high‐energy radiation makes a firm prediction that can be tested with existing and future observations.

show abstract

The Rees-Sciama effect and the primordial nucleosynthesis

Cited by 55 publications

References 21 publications

Sub-GeV flashes in γ-ray burst afterglows as probes of underlying bright far-ultraviolet flares

Sub-GeV flashes in γ-ray burst afterglows as probes of underlying bright far-ultraviolet flares

Supercollapsars and their X-ray bursts

On the generation of high-energy photons detected by the Fermi Satellite from gamma-ray bursts

Contact Info

Product

Resources

About