Abstract: The project's aim is to give reasons for the existence of a massive black hole in M 84. By measuring the galaxy's differential rotation (blue- and redshifts) the mass and density of the core can be determined. Now there are three possibilities to proof the existence of a black hole: 1. The density of the core must be higher than the density of giants in a minimal space. 2. The brightness of the core must be higher than the brightness which could be reached by bright stars in this area. 3. Jets could be discovered at short wavelengths.

Full Text of Proposal

Comments by OPC

General Comments: The program is feasible. Short exposures in B and V filters are no problem, but the measurement of differential rotation depends on the availability of a spectrograph.

Visibility: Would have to be observed at the very end of the night.

Special Comments: It is not clear if a spectrograph will be available. Placement/orientation of slit across galaxy needs to be decided.

Expected time consumption (including overhead): About 1 hour.

Proposed facility: Will depend on the availability of an adequate spectrograph. Otherwise, no problem for the broad-band images; Wendelstein?