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Title:
WSRT and VLA observations of HI in the direction of 3C 10.
Authors:
Schwarz, U. J.; Goss, W. M.; Kalberla, P. M.; Benaglia, P.
Publication:
Astronomy and Astrophysics, v.299, p.193 (A&A Homepage)
Publication Date:
07/1995
Origin:
A&A via CDS; KNUDSEN
A&A Keywords:
ISM: TYCHO SNR, ATOMS, GALAXY: STRUCTURE, RADIO LINES: ISM, TECHNIQUES: INTERFEROMETRIC
Bibliographic Code:
1995A&A...299..193S

Abstract

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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