Other
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.2102c&link_type=abstract
American Astronomical Society, HEAD meeting #4, #21.02; Bulletin of the American Astronomical Society, Vol. 31, p.723
Other
Scientific paper
The second EGRET catalog and its supplement (Thompson et al. 1995, 1996) contain 157 point sources detected at energies between 30 MeV and 20 GeV. Just about 40 % of these sources have been identified with objects also detected at lower energy bands, like pulsars and blazars. Of the unidentified sources, 56 are located at galactic latitudes mid b mid > 10(deg) , and 40 at mid b mid < 10(deg) . We present here the results of 1.42-GHz continuum and HI-line observations of the environs of the unidentified EGRET sources 2EG J0720-4746, 2EGS J0724-5157, and 2EG J1648-5042, obtained with single dish telescopes at IAR. From these observations we have found that the most likely radio counterparts of 2EG J0720-4746 and 2EG J1648-5042 are extragalactic sources, namely J0721-4744 and J1650-5044. On the other hand, a galactic origin seems feasible for 2EGS J0724-5157: it is supported by the detection of a nonthermal source positionally coincident with a minimum in the HI maps at a velocity of -3+/-2 km s(-1) . The possibility of a SNR interacting with a nearby cloud, in a similar case to that disclosed by Combi et al (1998), should be explored in the future. References: Combi J.A., et al. 1998, A&A 333, L91; Thompson D.J., et al. 1995, ApJS 101, 259; Thompson D.J., et al. 1996, ApJS 107, 227.
Azcarate I. N.
Benaglia Paula
Combi Jorge Ariel
Romero Gustavo E.
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