The Deep Multicolor Survey (DMS) Home Page

The Deep Multicolor Survey utilized CCD imaging with the Mayall 4-m telescope in the U, B, V, R', I75 and I86 bands to cover 0.83 sq. deg. in six fields at high galactic latitude. The survey reached 5 sigma limiting magnitudes of 22.1 in I86 to 23.8 in B. The goals of the survey were to search for fainter quasars at high redshift, z > 3, and at lower redshift, z < 2.2, than had been done before with multicolor images and an electronic detector. The survey was also intended to be useful for the study of faint field galaxies and of faint stars at high galactic latitude.

The survey is described in three main papers which are listed below. Paper I covers the main properties of the survey, the data reductions, how objects were detected and classified, and the photometric measurements. Paper II discusses the different techniques used to find quasars in the survey, the initial spectroscopic observations, and the first results obtained for quasars, compact emission-line galaxies, and stars. Paper III describes the additional spectroscopic observations made of quasar candidates and summarizes the results to date.

In Paper IV, we make available in electronic form, via the hyperlinks listed immediately below, the stellar catalog of 19,494 objects that emerged from the survey. The catalog contains positions, magnitudes, and error estimates in the six filter bands for all the objects. We also present tables that contain the spectroscopic results for the 55 quasars, 44 compact narrow emission-line galaxies, and 135 stars in the catalog that we have confirmed to date. The tables also have hyperlinks to illustrations of all the spectra. Paper IV can be obtained electronically from the link under the Publications heading.

[The Stellar Catalog] [Quasars] [CNELG's] [Stars] [Recent Changes/Updates]
Note: A compressed tar file containing the above files can also be obtained by anonymous ftp to


A Deep Multicolor Survey. V. The M Dwarf Luminosity Function by Martini, P., and Osmer, P.S, 1998, AJ, 116, 2513 (astro-ph/9808028)[ Compressed Postscript file (129KB)].

A Deep Multicolor Survey. IV. The Electronic Stellar Catalog by Osmer, P.S., Kennefick, J.D., Hall, P.B., and Green, R.F. 1998, ApJSupp, 119,189 (astro-ph/9806366). [ Text (50KB), tables (12-18KB each), and figures (12-130KB each)]

Luminosity Functions And Evolution Of Blue Galaxies In A Deep Multicolor CCD Field Survey, (astro-ph/9806041) by Liu, C.T., Green, R.F., Hall, P.B. and Osmer, P.S., AJ in press

A Deep Multicolor Survey. III. Additional Spectroscopy and Implications for the Number Counts of Faint Quasars by Kennefick, J.D., Osmer, P.S., Hall, P.B, and Green, R.F. 1997, AJ, 114, 2269. [Abstract] [Postscript(88k)] This file is also available at anonymous ftp at in pub/julia/ and at astro-ph/9708138.

Spectroscopic Observations of Quasar Candidates from a Deep Multicolor Survey by Osmer, P.S., Kennefick, J.D., Hall, P.B., and Green, R.F. 1996, in N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall (eds.), The Hubble Space Telescope and the High Redshift Universe, Singapore: World Scientific Publishing Company, 405. [Abstract] [Postscript(49k)]

Deep Multicolor Quasar Survey II. Initial Spectroscopy and Comparison with Expected Number Counts by Hall, P. B., Osmer, P. S., Green, R. F., Porter, A. C., and Warren, S. J. 1996, ApJ 462, 614. Compressed PostScript format files: Text and Tables (64k); Figures (2750k).
These files are also available at anonymous ftp at in pub/julia/dms2*.ps.gz and at astro-ph/9512051. An ERRATUM was published in ApJ, 471, 1073 (1996). The originally published Figures 16b and 16c are reversed. Also, the quality of many of the figures is rather poor since they were scanned by the printers rather than produced from the postscript files. The figures available at this web site are full quality, as are those in the erratum.
A few minor additional errors in Paper 2 have come to light: DMS 1715+4952 (Quasar #33 in Table 1) should have a declination of +49 52 00.75. Some of the uncertainties in Tables 3 and 4 were computed incorrectly, though the differences are small and do not change the conclusions, and in any case those Tables have been superceded by Tables 3 and 4 of Paper III.

Deep Multicolor Quasar Survey I. Imaging Observations and Catalog of Stellar Objects by Hall, P. B., Osmer, P. S., Green, R. F., Porter, A. C., and Warren, S. J. 1996, ApJS 104, 185. [Compressed PostScript(169k)] This file is also available at anonymous ftp at in pub/julia/ and at astro-ph/9512052.

Followup Research

Djorgovski et al. have spectroscopically confirmed that the z>4 quasar discovered in the DMS survey has z=4.36. They have also spectroscopically confirmed a counterpart to the z=4.10 DLA system seen in its spectrum. The counterpart is an R=26 galaxy with a star formation rate of about 0.7 solar masses per year.

Patrick S. Osmer, updated June 30, 1998