The Central Regions of NGC 4691: A Remarkable Structure with a Fast Outflow near the Nucleus

Details The Central Regions of NGC 4691: A Remarkable Structure with a Fast Outflow near the Nucleus The Central Regions of NGC 4691: A Remarkable Structure with a Fast Outflow near the Nucleus

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451..156g&link_type=abstract

Astrophysical Journal v.451, p.156

Astronomy and Astrophysics

Astronomy

11

Galaxies: Jets, Galaxies: Individual Ngc Number: Ngc 4691, Galaxies: Nuclei, Infrared: Galaxies

Scientific paper

We present new R, I, and Hα imaging, and spectroscopy near Hα, for the barred galaxy NGC 4691. A remarkable structure in the innermost regions, composed of four main unresolved sources symmetrically distributed around the center, is apparent in all R, I, and Hα images. The spectroscopic data reveal the existence of a broad Hα component, ΔVFWHM ≃ 1207+180-5 km s-1, with a centroid that is blueshifted by some 500 km s-1 with respect to the normal emission of the galaxy. We interpret this broad-line component as an outflow that is pushing gas out of the plane of the galaxy, most probably due to compact supernova remnants inside dense H ii circumnuclear regions.

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