An unsuccessful search for very extended halos around NGC 1300 and M61

Details An unsuccessful search for very extended halos around NGC 1300 and M61 An unsuccessful search for very extended halos around NGC 1300 and M61

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..583b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Aug. 1984, p. 583-587.

Astronomy and Astrophysics

Astronomy

12

Astronomical Spectroscopy, Galactic Clusters, H Lines, K Lines, Quasars, Spiral Galaxies, Absorption Spectra, Spectrographs

Scientific paper

The authors have undertaken a sensitive search for H and K absorption arising of two spiral galaxies that are projected against background QSOs, using a blue-sensitive spectrograph attached to the Multiple Mirror Telescope. Despite good sensitivity (S/N ≡ 20) and high spectral resolution (1 Å), this search program produced a null result. In the best case, the authors can set an upper limit on the equivalent width of H and K absorption of 0.1 Å. A 21-cm search for a very extended halo around NGC 1300 was also negative, restricting H I emission column densities to <1020cm-2 at distances >50 kpc from the nucleus.

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