Other
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..943e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 943-948.
Other
4
H Alpha Line, Infrared Spectra, Interstellar Matter, Line Spectra, Paschen Series, Quasars, Interstellar Extinction, Pixels
Scientific paper
The importance of internal reddening in QSOs can be assessed by comparison of Pa-alpha line fluxes with Balmer line fluxes. For two QSOs, Pa-alpha lines with a cooled grating spectrometer were observed using a resolving power of 200. In the case of PG 0026 + 129, the Pa-alpha line flux is considerably less than that determined by some earlier, lower resolution measurements. This result suggests that the Pa-alpha lines in other QSOs should also be reobserved with higher resolution. The Pa-alpha/H-alpha line ratios in both QSOs are consistent with standard QSO models without reddening. It is concluded that substantial reddening is unlikely in these objects unless the intrinsic Pa-alpha/H-alpha ratios are lower than those of current models.
Evans Neal J. II
Natta Antonella
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