NGC 404, a galaxy without dark matter

Details NGC 404, a galaxy without dark matter NGC 404, a galaxy without dark matter

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..11..121d&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

We present high resolution (15'' and 2.5 km/s) HI observations of the S0 gal axy NGC 404. We derive an HI mass of MHI = 6.7 × 107 Msolar, in good agreement with previous measurements. The HI is distributed in a broad annulus and extends out to a diameter of 9', well beyond the optical diameter of 6'. The velocity field is regular and shows, surprisingly, a declining rotation curve. This decline is purely Keplerian, strongly suggesting that all the mass is contained within the inner 200''.

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