Extended Lyman-alpha emission in 3C 326.1: A 100 kiloparsec cloud of ionized gas at a redshift of 1.82

Details Extended Lyman-alpha emission in 3C 326.1: A 100 kiloparsec cloud of ionized gas at a redshift of 1.82 Extended Lyman-alpha emission in 3C 326.1: A 100 kiloparsec cloud of ionized gas at a redshift of 1.82

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319l..39m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. L39-L44. Research supported

Astronomy and Astrophysics

Astrophysics

119

Extragalactic Radio Sources, Interstellar Gas, Ionized Gases, Lyman Alpha Radiation, Red Shift, Very Large Array (Vla), Emission Spectra, Galactic Evolution, High Resolution, Line Spectra, Radio Galaxies

Scientific paper

The discovery of a large cloud of ionized gas associated with the high-redshift radio source 3C 326.1 is reported; this cloud is the best candidate for a protogalaxy yet observed. The radio source is a small double without a detectable core which is encompassed by a cloud of ionized gas of approximately 100 kpc diameter and a redshift of 1.825. Two faint blue objects are located on the periphery of the cloud along with some very faint, extremely diffuse blue objects roughly coincident with the brightest regions of the cloud. The Ly-alpha emission from the cloud appears to have a large intrinsic width. Weak extended emission from semiforbidden C II and semiforbidden C III is seen, but C IV emission is not detected. The large equivalent width of Ly-alpha and the relative strengths of the carbon lines are consistent with H II region-type photoionization.

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