Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.b1512v&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #B15.12
Physics
Scientific paper
We present the first results of our observations of the Galactic ridge from 2-60 keV with RXTE. The observations, performed in September of 1996, consist of 14 one hour scans along the galactic plane from 56^o to -44^o in galactic longitude and -1.5^o to 1.5^o in latitude (fov 1^o FWHM circular). Maps of the Galactic ridge in the 2-9, 9-13 and 13-19 keV have been constructed from the scans. A bright, unresolved extended emission extending to at least ± 40^o in galactic longitude and ± 1^o in galactic latitude is clearly visible in these maps confirming results from previous missions (e.g. EXOSAT). Maps in the >10 keV band represent the first clear detection of the ridge emission in high energies. We report on the spatial variation of the extended emission and its scale height in various energy bands. Spectral measurements provide clues as to the origin of the emission. However, the spectrum of the ridge in the 10-100 keV has not been previously well measured. We present preliminary measurement of the spectrum of the ridge in the 2-60 keV band and discuss its relationship to the measurements in higher energies.
Ebisawa Ken
Gehrels Neil
Jahoda Keith
Marshall Francis E.
Smale Alan P.
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