Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..480k&link_type=abstract
Nature, vol. 276, Nov. 30, 1978, p. 480.
Astronomy and Astrophysics
Astronomy
22
Astronomical Photometry, Astronomical Spectroscopy, Radio Sources (Astronomy), Supernova Remnants, Line Spectra, Radio Galaxies, Visual Observation
Scientific paper
Spectrophotometric measurements of the red diffuse object identified with the very small-diameter radio source at the center of the galactic supernova remnant G127.1+0.5 are reported which were made over the wavelength range from 4000 to 7500 A with an image dissector scanner at a resolution of about 20 A. The data suggest that the link between the central source and the supernova remnant is purely circumstantial. The spectrum of the object is found to consist of a very red continuum with two broad emission bands at 6691 and 6841 A, respectively; the first band is identified as a blend of forbidden N II and H-alpha emission, while the second is identified as the S II doublet at 6717 and 6731 A. An extinction factor of 5 mag in the visible is determined, the corrected absolute magnitude of the object is estimated to be near -21, and other properties are noted which are characteristic of radio galaxies. It is proposed that the central source in G127.1+0.5 is a luminous galaxy at a distance of the order of 100 Mpc which contains a compact and energetic radio source.
Chevalier Roger A.
Kirshner Robert P.
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