Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98..300t&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. 300-308. Research supported by the Academy of Finland.
Astronomy and Astrophysics
Astrophysics
15
Absorption Spectra, Galactic Radiation, Quasars, Red Shift, Astronomical Photometry, Galactic Structure, Hubble Diagram, Hydrogen Clouds, Interstellar Extinction, Line Spectra, Optical Thickness
Scientific paper
1. This paper concerns quasars as a new means of studying galactic absorption.
2. It is argued that the residual δ(B-V)=B-V-(B-V)0(z), where (B-V)0(z) is the unreddened colour vs. redshift relation, is a promising indicator of galactic selective extinction for radio quasars with z <1.6. This is supported by evidence from δ(B-V) vs. MV, δ(B-V) vs. A(Hubble counts), δ(U-V) vs. δ(B-V), and δ(B-V) vs. NHI diagrams.
3. The δ(B-V) vs. MV diagram here introduced is consistent with the following propositions: a) RV ≍ 3.3, b) there is a quasar population with a sharp cut-off in optical luminosities, and c) the redshifts are cosmological.
4. The δ(B-V) vs. A(Hubble counts) and δ(B-V) vs. NHI diagrams suggest that AB, or the optical half-thickness of the Galaxy, is larger than 0m.25. Revised KV-corrections are derived for different values of AB for z ≦ 2.0.
5. The δ(B-V) vs. NHI diagram reveals a remarkable two-branch structure, suggested to reflect high-latitude clouds towards the Local spiral arm. It is hypothesized that the clouds are mostly H2.
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