2002ApJ...567..342B


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET11:22:10

2002ApJ...567..342B - Astrophys. J., 567, 342-353 (2002/March-1)

Pulsar scintillation in the local interstellar medium: Loop I and beyond.

BHAT N.D.R. and GUPTA Y.

Abstract (from CDS):

Recent pulsar scintillation measurements from Ooty, in conjunction with those from Parkes and other large radio telescopes, are used for a systematic investigation of the local interstellar medium (LISM) toward the general direction of the Loop I Bubble. For several pulsars, clear evidence is found for an enhanced level of scattering that is over and above what can be accounted for by the enhanced scattering model for the Local Bubble. These results are interpreted in terms of enhanced scattering due to turbulent plasma associated with the Loop I shell. Useful constraints are obtained for the scattering properties of the shell. The inferred value for the scattering measure for the Loop I shell is found to be ∼0.3 pc m–20/3. Assuming a shell thickness of ∼5-10 pc, this implies an average strength of scattering in the shell that is ∼100-200 times larger than that in the ambient ISM. An alternative explanation, where the enhanced level of scattering is due to a possible ``interaction zone'' between the Local Bubble and the Loop I Bubble, is also considered; it is found to be somewhat less satisfactory in explaining the observations. The best-fit value for the scattering measure for such an interaction zone region is estimated to be ∼1.1 pc m–20/3. Furthermore, several pulsars beyond ∼1 kpc are found to show enhanced levels of scattering over and above that expected from this ``two-bubble model.'' For some of the low-latitude pulsars, this is found to be due to enhanced scattering from plasma inside the intervening Sagittarius spiral arm. We discuss the implications of our results for the interpretation of scintillation data and for the general understanding of the LISM.

Abstract Copyright:

Journal keyword(s): ISM: Bubbles - ISM: General - ISM: Structure - Stars: Pulsars: General

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Loop III SR? 01 12 +78.3           ~ 73 1
2 NAME Eri Bubble HI 03 52 -02.0           ~ 83 0
3 NAME MONOGEM SNR SNR 06 58 50 +13 55.9           ~ 86 0
4 NAME Vela Supershell sh 07 40 -22.           ~ 24 0
5 NAME GUM Nebula ISM 07 43 -42.1           ~ 383 1
6 PSR B0950+08 Psr 09 53 09.3 +07 55 36           ~ 681 2
7 PSR B1055-52 Psr 10 57 58.970 -52 26 56.52           ~ 673 0
8 PSR B1133+16 Psr 11 36 03.180 +15 51 09.62           ~ 598 0
9 NAME North Polar Spur ISM 12 00 +00.0           ~ 298 1
10 NAME Loop IV SNR 13 24 -13.6           ~ 53 1
11 PSR B1426-66 Psr 14 30 40.872 -66 23 05.04           ~ 74 0
12 PSR J1455-3300 Psr 14 55 47.9624 -33 30 46.360           ~ 106 1
13 PSR B1451-68 Psr 14 56 00.0177962908 -68 43 40.036712740           ~ 166 0
14 NAME Loop I SR? 15 01 -38.7           ~ 324 2
15 PSR B1534+11 Psr 15 37 09.9603 +11 55 55.554           ~ 386 1
16 PSR B1540-06 Psr 15 43 30.1579 -06 20 45.250           ~ 92 0
17 PSR B1541-52 Psr 15 44 59.844 -53 08 46.50           ~ 36 0
18 PSR B1556-44 Psr 15 59 41.535 -44 38 46.11           ~ 111 0
19 PSR J1604-72 Psr 16 03 35.67980 -72 02 32.6984           ~ 90 0
20 PSR B1601-52 Psr 16 05 16.3 -52 57 34           ~ 46 0
21 PSR B1604-00 Psr 16 07 12.1034 -00 32 40.830           ~ 197 0
22 PSR B1612+07 Psr 16 14 40.906 +07 37 31.00           ~ 79 0
23 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1087 1
24 PSR B1706-16 Psr 17 09 26.4413 -16 40 57.730           ~ 197 0
25 PSR J1713+0447 Psr 17 13 49.53053 +07 47 37.5264           ~ 347 1
26 PSR J1730-2304 Psr 17 30 21.6483 -23 04 31.400           ~ 108 1
27 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 470 1
28 PSR J1744-1134 Psr 17 44 29.4103 -11 34 54.727           ~ 199 1
29 PSR B1747-46 Psr 17 51 42.233 -46 57 24.80           ~ 97 0
30 PSR B1749-28 Psr 17 52 58.6896 -28 06 37.300           ~ 234 0
31 ICRF J181926.5+384501 SyG 18 19 26.54737811 +38 45 01.7863328           ~ 106 0
32 PSR B1845-19 Psr 18 48 18.03 -19 52 31.0           ~ 65 0
33 NAME Sgr Arm PoG 19 00 -30.0           ~ 505 1
34 PSR B2048-72 Psr 20 53 47.14 -72 00 42.2           ~ 47 0
35 NAME Loop 2 SR? 23 25 +26.5           ~ 71 1
36 NAME Local Bubble ISM ~ ~           ~ 675 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-11:22:10

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