Large-beam radio and infra-red observations toward the Virgo Cluster

Details Large-beam radio and infra-red observations toward the Virgo Cluster Large-beam radio and infra-red observations toward the Virgo Cluster

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ncimc...8..374c&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 8, July-Aug. 1985, p. 374-378. CNR-supported research.

Astronomy and Astrophysics

Astronomy

Extragalactic Radio Sources, Galactic Structure, Infrared Astronomy, Virgo Galactic Cluster, Bremsstrahlung, Dark Matter, Elliptical Galaxies, Halos

Scientific paper

Two 70 cm diam horn antennas pointed at sky targets 3 deg apart were used to scan M87 at IR wavelengths on two nights in May 1984. Details of the atmospheric correction procedures employed are provided. The scans revealed a 16 mK signal from an extended source, associated with M87, which had an angular dimension near 30 kpc. The presence of the extended source, which is suspected to be a halo around M87, was not revealed by earlier measurements at soft X-ray wavelengths. The total mass of the dark matter in the halo is projected to be 10 to the 13th solar masses. Finally, bremsstrahlung radiation is considered to be the source of the far-IR signatures observed.

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