Anomalous scattering of highly dispersed pulsars

被引：68
作者：
Löhmer, O
Kramer, M
Mitra, D
Lorimer, DR
Lyne, AG
机构：
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
来源：
ASTROPHYSICAL JOURNAL | 2001年 / 562卷 / 02期
关键词：
ISM : structure; pulsars : general; scattering;
D O I：
10.1086/338324
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report multifrequency measurements of scatter-broadening times for nine highly dispersed pulsars over a wide frequency range (0.6-4.9 GHz). We find the scatter-broadening times to be larger than expected and to scale with frequency with an average power-law index of 3.44 +/- 0.13, i.e., significantly less than that expected from standard theories. Such possible discrepancies have been predicted very recently by Cordes and Lazio.
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页码：L157 / L161
页数：5
相关论文
共 25 条
[1]   A programmable 36 MHz digital filter bank for radio science [J].
Backer, DC ;
Dexter, MR ;
Zepka, A ;
Ng, D ;
Werthimer, DJ ;
Ray, PS ;
Foster, RS .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1997, 109 (731) :61-68
[2]  
BHATTACHARYA D, 1992, ASTRON ASTROPHYS, V254, P198
[3]   A HIGH-FREQUENCY SURVEY OF THE GALACTIC PLANE FOR YOUNG AND DISTANT PULSARS [J].
CLIFTON, TR ;
LYNE, AG ;
JONES, AW ;
MCKENNA, J ;
ASHWORTH, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1992, 254 (02) :177-184
[4]   REFRACTIVE SCINTILLATION IN THE INTERSTELLAR-MEDIUM [J].
COLES, WA ;
FREHLICH, RG ;
RICKETT, BJ ;
CODONA, JL .
ASTROPHYSICAL JOURNAL, 1987, 315 (02) :666-674
[5]   SMALL-SCALE ELECTRON-DENSITY TURBULENCE IN THE INTERSTELLAR-MEDIUM [J].
CORDES, JM ;
WEISBERG, JM ;
BORIAKOFF, V .
ASTROPHYSICAL JOURNAL, 1985, 288 (01) :221-247
[6]   Anomalous radio-wave scattering from interstellar plasma structures [J].
Cordes, JM ;
Lazio, TJW .
ASTROPHYSICAL JOURNAL, 2001, 549 (02) :997-1010
[7]   SLOW PULSAR SCINTILLATION AND THE SPECTRUM OF INTERSTELLAR ELECTRON-DENSITY FLUCTUATIONS [J].
GOODMAN, J ;
NARAYAN, R .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1985, 214 (04) :519-537
[8]   Multifrequency polarimetry of 300 radio pulsars [J].
Gould, DM ;
Lyne, AG .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 301 (01) :235-260
[9]   Scintillation parameters for 49 pulsars [J].
Johnston, S ;
Nicastro, L ;
Koribalski, B .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 297 (01) :108-116
[10]   The characteristics of millisecond pulsar emission. III. From low to high frequencies [J].
Kramer, M ;
Lange, C ;
Lorimer, DR ;
Backer, DC ;
Xilouris, KM ;
Jessner, A ;
Wielebinski, R .
ASTROPHYSICAL JOURNAL, 1999, 526 (02) :957-975
123