Additional upper limits on a Lyman-alpha halo around PHL 957

Details Additional upper limits on a Lyman-alpha halo around PHL 957 Additional upper limits on a Lyman-alpha halo around PHL 957

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..817d&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Dec. 1979-Jan. 1980, p. 817-823.

Astronomy and Astrophysics

Astronomy

Halos, Lyman Alpha Radiation, Quasars, Stellar Radiation, Absorption Spectra, Telescopes

Scientific paper

The Kitt Peak video camera and 2.1-m telescope have been used to look for a possible Lyman-alpha halo around the quasar PHL 957, especially within the annular region of r in the range 2-10 arc sec. No halo was detected; this has implications regarding some of the absorption-line systems. Either there is a severe limit to the amount of absorbing material at distances between 25 and 100 kpc from the quasar (which would be evidence against some forms of the 'intrinsic' hypothesis for the origin of the absorption systems), or else the quasar's ionizing radiation fluctuates drastically on time scales of 100-100,000 years.

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