Observations at 408 MHz of the supernova remnant HB 3 (G132.6 + 1.5)

Landecker, T. L.; Vaneldik, J. F.; Dewdney, P. E.; Routledge, D.

doi:10.1086/114453

Cited by 22 publications

(38 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This limitation holds not only for the present observations, but also for most of the previously published maps with larger beam sizes. Subtracting W3 we get an integrated flux density for HB3 of about 51.5 ± 3.5 Jy in reasonable agreement with an extrapolated flux density of 47.8 Jy from the α = 0.6 ± 0.04 spectrum derived by Landecker et al (1987). Trushkin (2002) calculated a flatter spectrum with α = 0.49 when adding RATAN-600 data at 3.65 GHz and 3.90 GHz, which predicts about 57.8 Jy at 865 MHz.…”

Section: G1327+13 (Hb3)supporting

confidence: 86%

35 cm observations of a sample of large supernova remnants

Reich

Zhang

Fürst

2003

A&A

View full text Add to dashboard Cite

Abstract. We present radio maps of ten large-diameter supernova remnants observed at 35 cm wavelength with the Effelsberg 100-m telescope. The angular resolution is 14. 5. The sources are G126.2+1.6, G127.1+0.5, HB3, HB9, S147, IC 443, Cygnus Loop, W63 and HB21. For each object we give an integrated flux density and improved spectra when necessary. We also present a map of G213.0−0.6, which we tentatively identify as a new large supernova remnant with a very low surface brightness, apparently interacting with the H  region S284.

show abstract

Section: G1327+13 (Hb3)supporting

confidence: 86%

35 cm observations of a sample of large supernova remnants

Reich

Zhang

Fürst

2003

A&A

View full text Add to dashboard Cite

show abstract

“…We obtained a spectral index for HB3 between 1408 MHz and 4800 MHz of α = −0.61±0.06, which is consistent with values obtained by Fesen et al (1995), Landecker et al (1987), Kothes et al (2006). The TT-plot method was used to verify the spectrum.…”

Section: Discussionsupporting

confidence: 84%

The radio spectrum and magnetic field structure of SNR HB3

Shi

Han

Gao

et al. 2008

A&A

View full text Add to dashboard Cite

Context. Evidence for a spectral flattening of the supernova remnant (SNR) HB3 (G132.7+1.3) was recently claimed in the literature based on previously published total flux density data, and the flattening was further interpreted as the discovery of thermal bremsstrahlung emission in the shell of HB3. Aims. A spectral flattening has never been observed from any SNR before. Reliable observations of HB3 at frequencies above 3000 MHz are crucial to confirm such a spectral behaviour. Methods. We extracted 4800 MHz total intensity and polarisation data of HB3 from the Sino-German 6 cm polarisation survey of the Galactic plane made with the Urumqi 25 m telescope, and analysed the spectrum of HB3, together with Effelsberg data at 1408 MHz and 2675 MHz. Results. We found an overall spectral index of HB3 of α = −0.61 ± 0.06 between 1408 MHz and 4800 MHz, similar to the index at lower frequencies. There is no spectral flattening at high frequencies. We detected strong polarised emission from HB3 at 4800 MHz. Our 4800 MHz data show a tangential field orientation in the HB3 shell.

show abstract

“…The evolved supernova remnant (SNR) HB3 (G132.7+1.3; Landecker et al 1987), as one of the largest galactic SNRs currently known, has been previously observed by Caswell (1967) and Landecker et al (1987) in the radio continuum, by Leahy et al (1985) in X-rays, by Routledge et al (1991) in the HI-line, by Fesen et al (1995) in Hα, and by Koralesky et al (1998) in hydroxy1 (OH). Its known basic physical features are 60×80 pc in size based on a distance of 2 kpc (Routledge 1991).…”

Section: Introductionmentioning

confidence: 94%

“…Here we conclude that the fit with two power-laws better fits the data, but the significance of the improvement is difficult to assess due to the difficulty in assessing the systematic errors in the data. Landecker et al (1987) presented DRAO ST observations on HB3 at 408 MHz, and estimated its flux density 75 ± 15 Jy at 408 MHz after they considered that the plateau of emission around W3 and the bright ridge near the apparent perimeter of HB3 are thermal and separated them from HB3. Landecker et al considered the location border between W3 and HB3.…”

Section: Hb3 Spectral Indexmentioning

confidence: 99%

Radio spectral index variations of the SNR HB3

Tian

Leahy

2005

A&A

View full text Add to dashboard Cite

Abstract. We present images of the SNR HB3 at both 408 MHz and 1420 MHz from the Canadian Galactic Plane Survey mainly based on data from the Synthesis Telescope of the Dominion Radio Astrophysical Observatory. We reproduce the 100 m-Effelsberg HB3 image at 2695 MHz at large scale, and find that there exists a background emission gradient across the HB3 area. Based on our analysis of background emission and the boundary between W3 and HB3, we give HB3's flux density as 68.6 ± 11.5 Jy at 408 MHz and 44.8 ± 12.0 Jy at 1420 MHz, after subtracting flux from compact sources within HB3. The integrated flux-density-based spectral index between 408 MHz and 1420 MHz is 0.34 ± 0.15. The averaged T-T plot spectral index using all subareas is 0.36. Our measurement values are less than a previously published value of 0.6. The 408-1420 MHz spectral index varies spatially in HB3 in the range 0.1 to 0.7. We investigate the data used by previous authors, and consider more data at 232 MHz, 3650 MHz and 3900 MHz which are not included in previous calculations. There is evidence for two spectral indices for HB3 in the radio band, i.e., 0.63 (38-610 MHz) and 0.32 (408-3900 MHz). This is consistent with the spatial variations: the low frequency data mainly reflects the steeper indices and the high frequency data mainly reflects the flatter indices.

show abstract

Observations at 408 MHz of the supernova remnant HB 3 (G132.6 + 1.5)

Cited by 22 publications

References 0 publications

35 cm observations of a sample of large supernova remnants

35 cm observations of a sample of large supernova remnants

The radio spectrum and magnetic field structure of SNR HB3

Radio spectral index variations of the SNR HB3

Contact Info

Product

Resources

About