Speaker
Ji-hyun Kang
(Korea Astronomy and Space Science Institute)
Description
Turbulence study of the neutral hydrogen gas associated with supernova remnants (SNRs) has not been done so far, in spite of the fact that many HI surveys have been used to characterize the turbulent interstellar medium. This is mainly because the shocked HI emission of SNRs is difficult to be distinguished from the ambient HI emission in the Galactic Plane. We notice that some expanding HI shells of Galactic SNRs have observed at high velocities, and they are free from the contamination of other Galactic HI gas at such high velocities. In the Arecibo HI Inner Galactic Plane Survey data, four of these SNRs are detected and resolved at such high velocities, which enables us to investigate the turbulence properties of internal HI structures of SNRs. We present our preliminary results. We estimated the HI column density power spectra of four Galactic supernova remnants, W44, W51C, G54.4-0.3, and CTB80. We find that they follow a power-law with a slope of about -3, except CTB80, of which slope is flatter. This value is similar to those derived using the HI data in the Galaxy and the Large Magellanic Cloud. We discuss parameters affecting on the determination of the spectral slope, such as the integrated velocity range, the noise pattern of the data, and the edge effect. We also present the HI column density probability distribution functions of the same sources.
Author
Ji-hyun Kang
(Korea Astronomy and Space Science Institute)