Kapteyn Institute, Annual Report 1995 -- Rolf A. Jansen

The following contributions were included in the
1995 Annual Report of the Kapteyn Astronomical Institute
of the Rijksuniversiteit Groningen, p. 27

A Spectroscopic and Photometric Survey of Nearby Field Galaxies

To tackle the current lack of a comparison sample, representative of the nearby universe, R.A. Jansen and M. Franx have selected a magnitude limited sample of 200 nearby field galaxies from the CfA Redshift Survey, including galaxies of all types and of all luminosities. In collaboration with D.G. Fabricant and N. Caldwell they have obtained nuclear and integrated spectra for 90, B and R photometry for 160 and U photometry for 39 galaxies in this sample. The purpose of this study is to obtain an accurate description of the distribution of magnitude, structural parameters, color, and spectral types of nearby galaxies. The colors and spectral types are necessary to determine the probable evolutionary histories of the galaxies. The magnitude and structural parameters (effective radius and surface brightness) are necessary to calculate the detection rates at increasing redshift. This survey will serve as a benchmark for interpreting spectra and number counts of distant galaxies.

Conference papers

Knapen, J.H., Jansen, R.A., Beckman, J.E., Peletier, R.F., & Hes, R., ``Dust Extinction in Highly
Inclined Spirals'', in: The Opacity of Spiral Disks (eds. J. Davies and D. Burstein),
Proceedings of the NATO Advanced Research Workshop (Cardiff, UK), Kluwer Academic,
Publ., Dordrecht, p. 185, 1995

Research notes / Circulars

Johnson, W., Garnavich, P., Challis, P., Kirshner, R., Jansen, R., ''Supernova 1995J in
NGC 4512'', IAU Circ. 6157, 1, 1995
Pollas, C., Garnavich, P., Riess, A., Challis, P., Jansen, R., Filippenko, A., Barth, A., &
Stevens, D., ''Supernova 1995L in NGC 5157'', IAU Circ. 6165, 1, 1995
Pollas, C., Dennefeld, M., Garnavich, P., Challis, P., Kirshner, R., Caldwell, N., Jansen, R.,
''Supernova 1995ai in NGC 7794'', IAU Circ. 6252, 1, 1995

Participation in Scientific Meetings

R.A. Jansen, 50^e Nederlandse Astronomen Conferentie (Rokanje, the Netherlands,
18 - 20 May '95): ``Spectroscopic and Photometric Nearby Field Galaxy Survey''
(poster paper - Jansen, R.A., Franx, M., Fabricant, D.G., & Caldwell, N.)
R.A. Jansen, IAU Symposium 171 ``New Light on Galaxy Evolution'' (Heidelberg,
Germany, 26 - 30 June '95): ``Spectroscopic and Photometric Nearby Field Galaxy
Survey'' (poster paper - Jansen, R.A., Franx, M., Fabricant, D.G., & Caldwell, N.)

Work Visits

R.A. Jansen, Harvard-Smithsonian Ctr. for Astrophysics (Cambridge, U.S.A.) 10 - 30 April,
30 Aug.- 31 Dec. '95.

Observing trips

R.A. Jansen,
- 60'' telescope, F.L. Whipple Observatory (Mt.Hopkins, Arizona, USA); 23 - 31 March,
16 - 25 Oct. '95
- 48'' telescope, F.L. Whipple Observatory (Mt.Hopkins, Arizona, USA); Mar. 30 - Apr. 8,
23 - 30 Oct. '95.