Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasau..11r..79g&link_type=abstract
Astronomical Society of Australia, Proceedings, vol. 11, no. 1, p. 79
Astronomy and Astrophysics
Astrophysics
4
Galactic Nuclei, Image Analysis, Sky Surveys (Astronomy), Supernova Remnants, Astrophysics, Nonthermal Radiation, Pulsars, Radio Astronomy, Thermal Emission
Scientific paper
The Molonglo Observatory Synthesis Telescope (MOST) has been used to make an 843 MHz survey of the Galactic Center region. This survey has excellent sensitivity to structures up to approximately 30 min in size and has given an unprecedented view of the region between longitudes l = 5 deg and l = 355 deg, with latitudes in the range absolute value of b less than or equal to 2.5 deg (see Gray, 1993, PhD thesis, University of Sydney). Using these data, a detailed study of the supernova remannts (SNRs) in the inner Galaxy--both known objects and new identifications--was possible. Nine objects in the survey region are catalogued as SNRs, only one of which, G358.4-1.9, had properties inconsistent with those previously published (Green, 1991 Proc. Astron. Soc. Pacific, 103, 209). It was, in fact, totally absent from the MOST images, although it is quite prominent in single-dish images (e.g., Reich et al., 1990, Astron. Astrophys. Suppl., 85, 633). No other SNR in the southern Galaxy exhibits this behavior (Anne Green, private communication). Comparisons with data from other wave-bands, notably Parkes 6 and 13 cm images and IRAS 60 micrometers plates, suggest that this object is in fact thermal, as was originally suggested by Westerhout (1958, Bull. Astron. Inst. Netherlands, 14, 215). In addition to the known objects, seventeen new objects were identified as SNR candidates on the basis of their morphological features and/or nonthermal emission properties. A comparison of the longitude distribution of SNRs before and after the MOST surveys (including the MOST Galactic Plane Survey; see the previous Abstract by Green) showed that, on the whole, the distribution does not deviate significantly from that expected from a random distribution of SNRs in the Galactic disc. However, an excess of 14 SNRs is present in the Galactic Center.
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