OSSE Observations of the M87/NGC 4388 Region

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Session 46 -- Seyfert Galaxies and LINERS
Display presentation, Thursday, January 13, 9:30-6:45, Salons I/II Room (Crystal Gateway)

[46.11] OSSE Observations of the M87/NGC 4388 Region

C.K. Guerard, G. Jung (USRA), W.N. Johnson, R.L. Kinzer, J.D. Kurfess, M.S. Strickman (NRL), D.A. Grabelsky, W.R. Purcell, M.P. Ulmer (Northwestern University)

The central region of the Virgo Cluster includes the giant elliptical galaxy M87 which has been extensively studied as a low-energy x-ray source. In hard x-rays the nearby Seyfert 2 galaxy NGC 4388 can be more intense and may dominate the hard x-ray emission from the Virgo cluster. The OSSE instrument on the COMPTON Observatory has observed these two sources on two ocassions. The first was 17 Sept 1992 - 8 Oct 1992 and the second was 26 Aug 1993 - 6 Sept 1993. These respresent the most sensitive observations of this region of the sky in low-energy gamma-rays; however the analysis is complicated by the large 3.7 x 11.4 degree field-of-view of the OSSE detectors and the 1.2 degrees separation between M87 and NGC 4388. Preliminary results of the spectra and variability of both sources will be presented.

Thursday program listing