Upper limits on a Lyman-alpha halo around PHL 957

Details Upper limits on a Lyman-alpha halo around PHL 957 Upper limits on a Lyman-alpha halo around PHL 957

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213l..31d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, Apr. 1, 1977, p. L31-L33. Research supported by the Alfred P. S

Astronomy and Astrophysics

Astrophysics

8

Astronomical Photometry, Halos, Lyman Alpha Radiation, Quasars, Electron Density (Concentration), Focal Plane Devices, Photoionization, Radiative Transfer, Red Shift, Sky Brightness

Scientific paper

Results are reported for a search for a Lyman-alpha halo around the quasar PHL 957, which was conducted using a beam-switching pulse-counting photometer with an interference filter and a circular focal-plane diaphragm. Hypothetical halo sizes and masses are considered, the observing procedure is described, and uncertainties in the results obtained are evaluated. Within the limits of uncertanties in telescope pointing, no halo was detected down to a limiting surface brightness far below that of the night sky.

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