E-viri
Recenzirano
Odprti dostop
-
Jordana-Mitjans, N; Mundell, C G; Smith, R J; Guidorzi, C; Marongiu, M; Kobayashi, S; Gomboc, A; Shrestha, M; Steele, I A
Monthly Notices of the Royal Astronomical Society, 08/2021, Letnik: 505, Številka: 2Journal Article
ABSTRACT We report the earliest ever detection of optical polarization from a GRB forward shock (GRB 141220A), measured $129.5{-}204.3\,$s after the burst using the multicolour RINGO3 optical polarimeter on the 2-m fully autonomous robotic Liverpool Telescope. The temporal decay gradient of the optical light curves from $86\,$ to $\sim 2200\,$s post-burst is typical of classical forward shocks with α = 1.091 ± 0.008. The low-optical polarization $P_{ BV} = 2.8 _{- 1.6} ^{+ 2.0} \, {{\ \rm per\ cent}}$ (2σ) at mean time $\sim 168\,$s post-burst is compatible with being induced by the host galaxy dust ($A_{V, {\rm HG}}= 0.71 \pm 0.15 \,$mag), leaving low polarization intrinsic to the GRB emission itself – as theoretically predicted for forward shocks and consistent with previous detections of low degrees of optical polarization in GRB afterglows observed hours to days after the burst. The current sample of early-time polarization data from forward shocks suggests polarization from (a) the Galactic and host galaxy dust properties (i.e. $P \sim 1-3{{\ \rm per\ cent}}$), (b) contribution from a polarized reverse shock (GRB deceleration time, jet magnetization) or (c) forward shock intrinsic polarization (i.e. $P \le 2{{\ \rm per\ cent}}$), which depends on the magnetic field coherence length-scale and the size of the observable emitting region (burst energetics, circumburst density).
Avtor
Vnos na polico
Trajna povezava
- URL:
Faktor vpliva
Dostop do baze podatkov JCR je dovoljen samo uporabnikom iz Slovenije. Vaš trenutni IP-naslov ni na seznamu dovoljenih za dostop, zato je potrebna avtentikacija z ustreznim računom AAI.
Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
---|
Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
---|
Vir: Osebne bibliografije
in: SICRIS
To gradivo vam je dostopno v celotnem besedilu. Če kljub temu želite naročiti gradivo, kliknite gumb Nadaljuj.