Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pkas...12...63c&link_type=abstract
Publications of the Korean Astronomical Society, vol.12, no.1, p.63-84
Astronomy and Astrophysics
Astronomy
Scientific paper
We carried out high-resolution(FWHM=3'.3) HI 21cm observations of the supernova remnant(SNR) PKS0607+17 and HII region S261 using Arecibo 305m telescope. The observation was to investigate whether the high-velocity(HV) gas detected in the southern area of PKS0607+17 by Koo & Heiles(1991) is physically associated with the SNR or not. The velocity of the HV gas ranges from +64km/s to +87km/s, which is difficult to result from the Galactic rotation. The HV gas could be the gas accelerated by supernova blast wave. However, because the observation of Koo and Heiles(1991) was carried out using Hat Creek radio telescope(FWHM=~ 36'), the association of the HV gas with the SNR could not be investigated. Using the Arecibo HI 21cm data, we have found that the HV gas appears in the southern part of the SNR and its velocity ranges from +61km/s to +77km/s. But the HV gas is scattered in the whole field, not only toward PKS0607+17 but also outside the SNR. Accordingly the HV gas is probably not associated with the SNR, but is accidentally aligned along the same line of sight toward the SNR. Instead we have found that HI clouds at low velocities could be possibly associated with the SNR. In Arecibo HI 21cm channel maps the HI gas seems to surround the southern boundary of the SNR at VLSR=+19.6~+40.2km/s. But because the region of the Arecibo HI 21cm observation is not wide enough to examine the HI gas distribution, we investigated this area using the Berkeley low-latitude HI survey data(Weaver & Williams 1974) too. There we found HI gas surrounding the radio continuum boundary of PKS0607+17 at VLSR= +21.6 - +25.8km/s. It is possible that this HI gas is associated with the SNR, in which case, the velocity of the SNR V_o =~ +26km/s, its distance d=~12.5kpc, and its radius R=~145pc. If we assume that the expansion velocity is ~10km/s, then the age of the SNR is ~4.4x10e6 years. PKS0607+17 could be one of the oldest SNRs in the Galaxy. We also studied HI properties of the HII region S261, which is ~1 deg away from PKS0607+17. There has been no high-resolution HI 21cm observational study on S261. We discovered HI cloud located at the north-eastern part of S261 at VLSR=+5km/s - ~+10km/s, which is possibly associated with the HII region. The central velocity of the HI cloud VLSR=+7.2km/s and the corresponding distance d=1.5kpc. This velocity is comparable to the radio recombination line velocities.
Chang Myung Soon
Koo Bon-Chul
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