High-resolution H i and radio continuum observations of the SNR G290.1−0.8 |
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| Authors: | Estela M Reynoso † Simon Johnston Anne J Green Bärbel S Koribalski |
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| Institution: | Instituto de Astronomía y Física del Espacio (IAFE), C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina;School of Physics, University of Sydney, NSW 2006, Australia;Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia |
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| Abstract: | We have observed the supernova remnant (SNR) G290.1?0.8 in the 21-cm H i line and the 20-cm radio continuum using the Australia Telescope Compact Array (ATCA). The H i data were combined with data from the Southern Galactic Plane Survey to recover the shortest spatial frequencies. In contrast, H i absorption was analysed by filtering extended H i emission, with spatial frequencies shorter than 1.1 kλ. The low-resolution ATCA radio continuum image of the remnant shows considerable internal structure, resembling a network of filaments across its 13-arcmin diameter. A high-resolution ATCA radio continuum image was also constructed to study the small-scale structure in the SNR. It shows that there are no structures smaller than ～17 arcsec, except perhaps for a bright knot to the south, which is probably an unrelated object. The H i absorption study shows that the gas distribution and kinematics in front of SNR G290.1?0.8 are complex. We estimate that the SNR probably lies in the Carina arm, at a distance 7 (±1) kpc. In addition, we have studied nearby sources in the observed field using archival multiwavelength data to determine their characteristics. |
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| Keywords: | line: profiles ISM: individual: G290 1?0 8 supernova remnants radio lines: ISM |
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