A search for QSOs behind globular clusters

Details A search for QSOs behind globular clusters A search for QSOs behind globular clusters

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104...53h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 53-62. Research supported by Royal Society.

Astronomy and Astrophysics

Astronomy

14

Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Quasars, Schmidt Telescopes, Astronomical Maps, Galactic Clusters, Radio Astronomy, Radio Sources (Astronomy), X Ray Sources

Scientific paper

In order to provide a reference frame against which proper motions of stars in globular clusters might be measured, QSOs projected behind (primarily) northern globular clusters were searched for. Optical, X-ray, and radio techniques were used to select QSO candidates in these relatively crowded fields. Optical photometry, obtained from both CCD images and UK Schmidt Telescope photographic plates, resulted in most of the QSO identifications. Follow-up spectroscopy on the Multiple Mirror Telescope has confirmed 14 new QSOs and one H II galaxy in the fields of eight clusters.

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