Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91...56a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, Jan. 1986, p. 56, 57.
Astronomy and Astrophysics
Astronomy
5
Extragalactic Radio Sources, Galaxies, Infrared Astronomy Satellite, Radio Astronomy, Centimeter Waves, Radiant Flux Density, Radio Spectra, Size Determination, Spectral Resolution, Very Long Base Interferometry
Scientific paper
Aaronson and Olszewski (1984) have identified five IRAS infrared sources, previously considered to be blank fields, with faint galaxies. The authors reported previously the results of their VLA D-array observations at 6 cm (Antonucci and Olszewski, 1985), which resulted in detections of all objects at the mJy level. The sources were unresolved by the ≡16 arcsec beam. The present paper reports on B-array observations at 6 and 20 cm, made in order to determine or limit the source angular sizes, and to measure the spectral indices. The source 0358+223 has an angular size of ≡3 arcsec at 20 cm, but no redshift is available for this object; also 0404+101 is marginally resolved at 20 cm. The other sources are unresolved by the ≡1.1 arcsec resolution deep 6 cm maps, implying linear sizes <2 kpc. The spectra are steep, indicating that the radiation mechanism is optically thin synchrotron emission.
Antonucci Robert R. J.
Olszewski Edward W.
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