2007A&A...461.1013L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET20:50:53

2007A&A...461.1013L - Astronomy and Astrophysics, volume 461, 1013-1018 (2007/1-3)

Radio spectrum and distance of the SNR HB9.

LEAHY D.A. and TIAN W.W.

Abstract (from CDS):

New images are presented of the supernova remnant (SNR) HB9 based on 408 MHz and 1420 MHz continuum emission and HI-line emission data from the Canadian Galactic Plane Survey (CGPS). Two different T-T plot methods and new integrated flux densities give spectral index (Sν∝ν–α) for the whole of HB9 of 0.48±0.03; 0.49; and 0.47±0.06, respectively. These values are lower than the previous spectral index estimated for HB9 (α=0.61). The change is mainly due to improved 1420 MHz data. No difference in spectral index is detected between strong and weak filaments. A new result is that the spectral index for interior regions is steeper than for the rim. This can be explained by a standard curved interstellar electron energy spectrum combined with lower interior magnetic field compared to that near the outer shock. This results in a larger proportion of steep spectrum emission for lines-of-sight through the central body of the SNR. HI observations show structures probably associated with the SNR in the radial velocity range -3 to -9km/s, suggesting a kinematic distance of 0.8±0.4kpc for the SNR. This is consistent with the distance to the radio pulsar PSR B0458+46, offset from the center of HB9 by 23'. However the pulsar spindown and kinematic ages are significantly greater than estimates of the SNR age: the Sedov age for HB9 is 6600yr and the evaporative cloud model yields ages of 4000-7000yr.

Abstract Copyright:

Journal keyword(s): radio continuum: ISM - radio lines: ISM - ISM: supernova remnants

Simbad objects: 5

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Number of rows : 5

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 33P 99 G 04 58 26.741 +46 24 31.13           ~ 11 1
2 SNR G160.8+02.6 SNR 05 01 00.000 +46 40 00.00           ~ 195 0
3 PSR B0458+46 Psr 05 02 04.561 +46 54 06.09           ~ 76 0
4 GAL 000.0+00.0 gam 17 45 39.60213 -29 00 22.0000           ~ 12009 0
5 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 836 0

    Equat.    Gal    SGal    Ecl

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2021.03.04-20:50:53

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