Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..386y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. 386-392. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
15
Gravitational Lenses, Lyman Alpha Radiation, Quasars, Astronomical Spectroscopy, Carbon, Red Shift, Spectral Resolution
Scientific paper
Spatially resolved, long-slit spectra of components A and B of the gravitational lens system 2237 + 030 have been obtained in Ly-alpha and C IV at the CFHT. For Ly-alpha, A and B are clearly resolved in both the emission line and continuum with almost no contamination from components C or D. The spectrogram of the two components shows an absorption trough situated about 255 km/s redward of the broad emission-line centroid which contains a narrow emission feature lying spatially between the two components. There are, however, two distinct absorption systems in both the N V and C IV doublets which are matched in redshift. It is proposed that this partially resolved Ly-alpha emission component, spatially distinct from the quasars, arises from the gravitational lensing of a massive compact star-forming region that is associated with either the host galaxy or a companion galaxy and which also likely produces the absorption systems. The Ly-alpha absorption clouds have sufficiently high column density that the two profiles merge, whereas the lower column densities in N V and C IV give rise to separate absorption lines. The C IV spectrogram shows neither this narrow emission component nor the double-peaked structure so evident in Ly-alpha. This is probably the result of contamination from component D caused by a slight misalignment of the slit and the fact that the Ly-alpha/C IV intensity ratio is larger in star-forming regions than in ACN.
de Robertis Michael M.
Yee Howard K. C.
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