New observations of Pa-alpha lines in two quasi-stellar objects
Journal Article
·
· Astrophys. J.; (United States)
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. 35 refs.
- Research Organization:
- Texas Univ., Austin (USA); CNR, Centro per l'Astronomia Infrarossa, Florence (Italy)
- OSTI ID:
- 5726964
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 339; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
BALMER LINES
COMPARATIVE EVALUATIONS
COSMIC RADIO SOURCES
INFRARED SPECTRA
INTERSTELLAR SPACE
MEASURING INSTRUMENTS
PASCHEN LINES
QUASARS
SPACE
SPECTRA
SPECTROMETERS
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
BALMER LINES
COMPARATIVE EVALUATIONS
COSMIC RADIO SOURCES
INFRARED SPECTRA
INTERSTELLAR SPACE
MEASURING INSTRUMENTS
PASCHEN LINES
QUASARS
SPACE
SPECTRA
SPECTROMETERS