VLBI aperture synthesis observations of 1720-MHz OH in NGC 7538 /IRS1/

Details VLBI aperture synthesis observations of 1720-MHz OH in NGC 7538 /IRS1/ VLBI aperture synthesis observations of 1720-MHz OH in NGC 7538 /IRS1/

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201p...7f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 7P-12P.

Astronomy and Astrophysics

Astronomy

5

Hydroxyl Emission, Interstellar Masers, Very Long Base Interferometry, Apertures, Astronomical Maps, Brightness Temperature

Scientific paper

The 1720-MHz OH source in NGC 7358 (IRS1) has been observed with four telescopes in the European VLBI network. Aperture synthesis mapping with a beam of 0.03 arcsec shows six discrete maser positions concentrated in an elongated region of size 0.3 x 0.15 sq arcsec. The maser emission arises from two groups of unresolved spots, with apparent brightness temperatures greater than 10 billion K. The two separate spatial groups correspond to two distinct velocity groups.

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