WSRT and VLA observations of HI in the direction of 3C 10.

Details WSRT and VLA observations of HI in the direction of 3C 10. WSRT and VLA observations of HI in the direction of 3C 10.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..193s&link_type=abstract

Astronomy and Astrophysics, v.299, p.193

Astronomy and Astrophysics

Astrophysics

35

Ism: Tycho Snr, Atoms, Galaxy: Structure, Radio Lines: Ism, Techniques: Interferometric

Scientific paper

Westerbork Synthesis Radio Telescope HI observations combined with Effelsberg 100m antenna observations have been made of the galactic supernova remnant 3C 10 (Tycho) with an angular resolution =~50" and a velocity resolution of 0.62km/s and with the VLA with resolutions of ~13" and 1.3km/s, respectively. HI absorption against 3C 10 was detected in the velocity range -60<=v<=10km/s. The most negative velocity component is at -57km/s. HI absorption in the direction of extragalactic source 3C11.1 and two additional sources close to 3C 10 (distance <~1deg) was obtained using the Very Large Array. Comparison of the spectra together with two other sources from Taylor & Roberts (1993) (distance <~2deg) leads to the conclusion that 3C 10 is at a distance of 4.5kpc. The implications of this distance are discussed. The HI absorption at -48km/s in the direction of 3C 10 shows a filament of size ~4'. Self-absorption near 3C 10 is also detected at this velocity, and an upper limit of 25 K for the spin temperature can be derived. A comparison with a high resolution 100μ IRAS image is discussed. The HI absorption at low velocities (-20<=v<=+10km/s) shows primarily large scale structure. For this gas a spin temperature of 75K can be derived. All distances are based on Rsun_=8.5kpc.

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