Detection of filaments of ionized gas in NGC 4684

Details Detection of filaments of ionized gas in NGC 4684 Detection of filaments of ionized gas in NGC 4684

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280..121b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 1, p. 121-127

Astronomy and Astrophysics

Astrophysics

6

Elliptical Galaxies, Galactic Evolution, Gas Jets, Interstellar Matter, Ionized Gases, Lenticular Bodies, Rotation, Velocity Distribution, Astronomical Spectroscopy, Carbon Monoxide, Cosmology, Emission Spectra, H Alpha Line, Kinematics, Nitrogen

Scientific paper

Two filaments of ionized gas, extending several kpc from each side of the nucleus, have been detected in the small (MB = -20.0) SO galaxy NGC 4684. An oval structure around the nucleus, with a projected size of 680 pc, is also visible. Both structures are only evident in hydrogen alpha + (N II) images, and not visible in V or red wavebands. The spectroscopic data indicate noncircular gas motions, similar to a radial flow. The nature of these structures and their physical conditions are discussed. The least exotic explanation, that peculiar motions are due to a small tumbling bar near the center, is the preferred choice.

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