The interstellar spectrum of the bright Seyfert galaxy NGC 3783 - Evidence for an extragalactic origin of high-velocity clouds

Details The interstellar spectrum of the bright Seyfert galaxy NGC 3783 - Evidence for an extragalactic origin of high-velocity clouds The interstellar spectrum of the bright Seyfert galaxy NGC 3783 - Evidence for an extragalactic origin of high-velocity clouds

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..481w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, Aug. 1, 1985, p. 481-497.

Astronomy and Astrophysics

Astronomy

48

Intergalactic Media, Interstellar Matter, Interstellar Radiation, Seyfert Galaxies, Calcium, Centimeter Waves, Interstellar Extinction, Interstellar Gas, Quasars, Sodium

Scientific paper

The authors present high-resolution (FWHM ≅ 20 km s-1), high signal-to-noise observations of the interstellar lines of Ca II and Na I in the spectrum of the bright Seyfert galaxy NGC 3783. These observations probe the interstellar medium over a very extended path length through the disc and halo of our Galaxy and of NGC 3783, as well as any intergalactic gas. The authors interpret the strong and complex interstellar absorption as evidence for parcels of gas in the Galactic halo which could be as far as 5.5 kpc above the disc, if they share in the differential rotation of the disc. In addition, a weak Ca II component at vLSR = +241 km s-1 is detected, in excellent agreement with the velocity of an intervening neutral hydrogen high-velocity complex. It is argued that this cloud is not local, but more likely is an independent extragalactic object, possibly associated with the Magellanic Stream. The mass of the cloud probably exceeds 107 solar masses. The implications of the findings for the interpretation of QSO absorption line systems are briefly discussed.

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