2000ApJ...531..883L


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:44:53

2000ApJ...531..883L - Astrophys. J., 531, 883-901 (2000/March-2)

Radio scintillation due to discontinuities in the interstellar plasma density.

LAMBERT H.C. and RICKETT B.J.

Abstract (from CDS):

We develop the theory of interstellar scintillation as caused by an irregular plasma having a power-law spatial-density spectrum with a spectral exponent of β=4 corresponding to a medium with abrupt changes in its density. An ``outer scale'' is included in the model that represents the typical scale over which the density of the medium remains uniform. Such a spectrum could be used to model plasma shock fronts in supernova remnants or other plasma discontinuities. We investigate and develop equations for the decorrelation bandwidth of diffractive scintillations and the refractive scintillation index and compare our results with pulsar measurements. We consider both a medium concentrated in a thin layer and an extended irregular medium. We conclude that the β=4 model gives satisfactory agreement for many diffractive measurements, in particular the VLBI measurements of the structure function exponent between 5/3 and 2. However, it gives less satisfactory agreement for the refractive scintillation index than does the Kolmogorov turbulence spectrum. The comparison suggests that the medium consists of a pervasive background distribution of turbulence embedded with randomly placed discrete plasma structures such as shocks or H II regions. This can be modeled by a composite spectrum following the Kolmogorov form at high wavenumbers and steepening at lower wavenumbers corresponding to the typical (inverse) size of the discrete structures. Such a model can also explain the extreme scattering events. However, lines of sight through the enhanced scattering prevalent at low Galactic latitudes are accurately described by the Kolmogorov spectrum in an extended medium and do not appear to have a similar low-wavenumber steepening.

Abstract Copyright:

Journal keyword(s): ISM: General - Stars: Pulsars: General - Radiative Transfer

CDS comments: Table 2 : PSR 1859-03 misprint for 1859+03

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PSR B0136+57 Psr 01 39 19.744 +58 14 31.73     13.41     ~ 140 0
2 PSR B0329+54 Psr 03 32 59.3462817079 +54 34 45.047901390           ~ 588 1
3 PSR B0525+21 Psr 05 28 52.308 +22 00 01.00     14.30     ~ 333 0
4 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4881 1
5 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5724 4
6 PSR B0736-40 Psr 07 38 32.2620 -40 42 39.420           ~ 174 0
7 PSR B0740-28 Psr 07 42 49.0730 -28 22 43.510           ~ 360 0
8 PSR B0809+74 Psr 08 14 59.500 +74 29 05.70           ~ 371 0
9 PSR B0818-13 Psr 08 20 26.4020 -13 50 56.400           ~ 187 0
10 PSR B0823+26 Psr 08 26 51.4 +26 37 23           ~ 475 1
11 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2105 1
12 PSR B0834+06 Psr 08 37 05.642 +06 10 14.56           ~ 400 0
13 PSR B0835-41 Psr 08 37 21.1943 -41 35 14.563     12.69     ~ 127 0
14 PSR B0950+08 Psr 09 53 09.2970 +07 55 36.400           ~ 701 2
15 PSR B1133+16 Psr 11 36 03.0720 +15 51 15.500           ~ 618 0
16 PSR B1237+25 Psr 12 39 40.386 +24 53 49.87           ~ 421 0
17 PSR B1508+55 Psr 15 09 25.7 +55 31 33           ~ 275 1
18 PSR B1641-45 Psr 16 44 49.2730 -45 59 09.710     12.60     ~ 181 0
19 PSR B1642-03 Psr 16 45 02.0330 -03 17 57.200           ~ 327 0
20 [KRL2007b] 236 AGN 17 20 21.81 -35 52 48.2           ~ 101 0
21 PSR B1749-28 Psr 17 52 58.7130 -28 06 33.900           ~ 241 0
22 PSR B1818-04 Psr 18 20 52.5920 -04 27 37.120           ~ 190 0
23 PSR B1859+03 Psr 19 01 31.7700 +03 31 04.960           ~ 133 0
24 W 49n HII 19 10 13.2 +09 06 12           ~ 423 3
25 PSR B1911-04 Psr 19 13 54.1820 -04 40 47.600           ~ 158 0
26 PSR B1919+21 Psr 19 21 44.815 +21 53 02.25           ~ 354 0
27 PSR B1933+16 Psr 19 35 47.7012077756 +16 16 40.025845719           ~ 277 1
28 PSR B1946+35 Psr 19 48 25.0067 +35 40 11.057           ~ 157 0
29 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1804 2
30 PSR B2111+46 Psr 21 13 24.2 +46 44 09           ~ 190 1
31 PSR B2217+47 Psr 22 19 48.139 +47 54 53.93           ~ 206 0

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:44:53

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