2017ApJ...846..104K

Query : 2017ApJ...846..104K

2017ApJ...846..104K - Astrophys. J., 846, 104-104 (2017/September-2)

Multi-frequency scatter broadening evolution of pulsars. I.

KRISHNAKUMAR M.A., JOSHI B.C. and MANOHARAN P.K.

Abstract (from CDS):

We present multi-wavelength scatter broadening observations of 47 pulsars made with the Giant Metre-wave Radio Telescope (GMRT), Ooty Radio Telescope (ORT), and Long Wavelength Array (LWA). The GMRT observations were made in the phased array mode at 148, 234, and 610 MHz and the ORT observations at 327 MHz. The LWA data sets were obtained from the LWA pulsar data archive. The broadening of each pulsar as a function of observing frequency provides the frequency scaling index, α. The estimations of α have been obtained for 39 pulsars and include entirely new estimates for 31 pulsars. This study increases the total sample of pulsars available with α estimates by ∼50%. The overall distribution of α with the dispersion measure (DM) of the pulsar shows interesting variations, which are consistent with earlier studies. However, for a given value of DM, a range of α values are observed, indicating the characteristic turbulence along each line of sight. For each pulsar, the estimated level of turbulence, Cne_2, has also been compared with α and DM. Additionally, we compare the distribution of α with the theoretically predicted model to infer the general characteristics of the ionized interstellar medium. Nearly 65% of the pulsars show a flatter index (i.e., α4.4) than that expected from the Kolmogorov turbulence model. Moreover, the group of pulsars with flatter indices is typically associated with an enhanced value of Cne_2 compared to those with steeper indices.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: general - pulsars: general - scattering - scattering

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 PSR B0329+54 Psr 03 32 59.3370698592 +54 34 45.028206408           ~ 645 1
2 PSR B0458+46 Psr 05 02 04.561 +46 54 06.09           ~ 85 0
3 M 1 SNR 05 34 30.9 +22 00 53           ~ 6191 1
4 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5258 0
5 PSR B0611+22 Psr 06 14 17.0324288405 +22 29 57.017874999           ~ 266 0
6 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2315 1
7 PSR B1325-49 Psr 13 28 33.58 -49 21 33.4           ~ 35 0
8 PSR J1556-4258 Psr 15 57 00.2520 -42 58 12.390           ~ 35 0
9 PSR B1600-49 Psr 16 04 22.9760 -49 09 57.980     13.00     ~ 72 0
10 PSR B1609-47 Psr 16 13 28.9900 -47 14 26.900     13.87     ~ 34 0
11 PSR B1620-42 Psr 16 23 48.34 -42 56 52.0           ~ 31 0
12 PSR B1635-45 Psr 16 39 21.201 -46 04 33.10           ~ 23 0
13 PSR B1647-52 Psr 16 51 42.9500 -52 22 58.600           ~ 40 0
14 PSR B1700-32 Psr 17 03 22.5200 -32 41 48.300           ~ 106 0
15 PSR J1705-3422 Psr 17 05 42.3620 -34 23 43.400           ~ 36 0
16 PSR B1718-32 Psr 17 22 02.9590 -32 07 45.300           ~ 90 0
17 PSR B1727-47 Psr 17 31 42.103 -47 44 34.56           ~ 148 0
18 PSR B1729-41 Psr 17 32 50.0 -41 28 48           ~ 23 0
19 PSR B1737-39 Psr 17 41 18.0790 -39 27 38.200           ~ 64 0
20 PSR B1740-13 Psr 17 43 37.622 -13 51 38.00           ~ 24 0
21 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
22 PSR B1742-30 Psr 17 45 56.3250 -30 40 22.600           ~ 165 0
23 PSR B1756-22 Psr 17 59 24.1350 -22 05 34.000           ~ 53 0
24 PSR B1758-03 Psr 18 01 22.660 -03 57 55.00           ~ 45 0
25 PSR B1804-27 Psr 18 07 08.5000 -27 15 02.000           ~ 45 0
26 PSR B1804-08 Psr 18 07 38.0266 -08 47 43.250           ~ 127 0
27 PSR J1808-0812 Psr 18 08 09.43 -08 13 01.5           ~ 37 0
28 PSR J1816-2650 Psr 18 16 35.3950 -26 49 54.000           ~ 53 0
29 PSR B1819-22 Psr 18 22 59.0000 -22 56 38.000           ~ 113 0
30 PSR J1823-0154 Psr 18 23 52.1600 -01 54 10.000           ~ 25 0
31 PSR B1822-09 Psr 18 25 30.5940 -09 35 21.200           ~ 346 0
32 PSR J1835-1106 Psr 18 35 18.287 -11 06 15.10           ~ 68 0
33 PSR B1846-06 Psr 18 49 06.4700 -06 37 06.100           ~ 65 0
34 PSR B1852+10 Psr 18 54 29.33 +10 46 42.0           ~ 15 0
35 PSR B1851-14 Psr 18 54 44.3000 -14 21 19.000           ~ 37 0
36 PSR B1900-06 Psr 19 03 37.9500 -06 32 22.100           ~ 60 0
37 PSR J1904-1224 Psr 19 04 33.281 -12 24 01.30           ~ 17 0
38 PSR B1902-01 Psr 19 05 28.3175436888 -00 56 43.316302416   11.6 11.2     ~ 36 0
39 PSR B1908+12 Psr 19 10 13.53 +12 31 40.2           ~ 38 0
40 PSR J1910+0714 Psr 19 10 18.597 +07 14 11.80           ~ 21 0
41 PSR B1907-03 Psr 19 10 29.7137636760 -03 09 54.925338636           ~ 56 0
42 PSR B1914+13 Psr 19 16 58.6000 +13 12 52.800           ~ 89 0
43 PSR B1923+04 Psr 19 26 24.4600 +04 31 31.900           ~ 66 0
44 PSR B1930+20 Psr 19 32 08.023 +20 20 46.41           ~ 82 0
45 PSR B1930+22 Psr 19 32 22.8565447656 +22 20 52.063074024     14.52     ~ 137 0
46 PSR B1933+16 Psr 19 35 47.7011639352 +16 16 40.034899524           ~ 302 1
47 PSR B2002+31 Psr 20 04 52.286 +31 37 10.01           ~ 132 0
48 PSR B2027+37 Psr 20 29 23.872 +37 44 08.17           ~ 42 0
49 PSR B2053+36 Psr 20 55 31.3552 +36 30 21.489           ~ 98 0
50 PSR B2111+46 Psr 21 13 24.3295 +46 44 08.844           ~ 208 1
51 PSR B2217+47 Psr 22 19 48.139 +47 54 53.93           ~ 219 0
52 PSR B2303+30 Psr 23 05 58.3212 +31 00 01.281           ~ 203 0

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