Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l..11m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, May 15, 1981, p. L11-L14. Research supported by the Consiglio N
Astronomy and Astrophysics
Astrophysics
27
Emission Spectra, Galactic Nuclei, Galactic Radiation, Heao 2, Spiral Galaxies, X Ray Sources, Cut-Off, Interstellar Gas, Line Spectra, Proportional Counters, Spectrum Analysis
Scientific paper
Imaging Proportional Counter observations reveal that three of the galaxies of the Grus Quartet, NGC 7552, 7582 and 7590, are X-ray emitters, with the strongest being the narrow emission line galaxy (NELG) NGC 7582. It is also confirmed, using Monitor Proportional Counter data, that the variable 2A 2315-428 consists essentially of this galaxy only; in whose spectrum evidence is found of a large photoelectric cutoff, with the corresponding galactic column density lying between 5 and 10 x 10 to the 22 nd/sq cm. It is shown that neither the interstellar medium nor the narrow emission line gas of this galaxy are likely to be the main causes of the cutoff. A crucial test to be pursued is time variability in the cutoff.
Maccacaro Tomasso
Perola Giuseppe Cesare
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