Hamburger Sternwarte - Research
Objective Prism Surveys
The Hamburg sky surveys made on Schmidt plates taken with objective
prisms consist of two complementary parts: The northern Hamburg Quasar
Survey (HQS) (b > 200; δ < 00) and
the southern Hamburg/ESO Survey (HES) (b > 300; δ
> 2.50). The plates of the HQS were taken 1985 - 1997
with the Calar Alto Schmidt telescope, and contain usable spectra with
a seeing limited resolution of 45 Å at Hγ in the
magnitude range 14 < B < 19. The southern plates were obtained
with the ESO Schmidt telescope 1990 - 1996, having a spectral
resolution of 15 Å at Hγ and containing usable spectra in
the magnitude range 13 < B < 18.
The HQS archive contains 1288 plates for 567 fields, while for the
HES one spectral plate was taken for each of 428 fields. Plates for
both surveys are scanned in full mapping mode by the Hamburg PDS
microdensitometer and the digitized database is used for a variety of
astronomical applications, in addition to the search for (mostly
bright) quasars.
The HQS archive contains 1288 plates for
567 fields, while for the HES one spectral
plate was taken for each of 428 fields. Plates for both surveys are scanned
in full mapping mode by the Hamburg PDS microdensitometer and the digitized
database is used for a variety of
astronomical applications, in addition to the search for (mostly bright)
quasars.
X-ray astronomy became topic of research in Hamburg with the launch of the
ROSAT satellite in 1990. A larger effort undertaken is the identification of
ROSAT sources on Schmidt plates of the Hamburg Quasar Survey. Based on these
identifications several AGN related projects were pursued,
involving follow-up observations of selected X-ray sources with ROSAT and optical
telescopes.
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