NGC 404, a galaxy without dark matter

Bibcode
2001RMxAC..11..121D
del Rio, M. S.; Brinks, E.; Cepa, J.
Bibliographical reference

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 1998, Eds: Aguilar, A.; Carramiñana, A.; Revista Mexicana de Astronomia y Astrofisica Serie de Conferencias, p. 121."

Advertised on:
7
2001
Number of authors
3
IAC number of authors
1
Citations
0
Refereed citations
0
Description
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''.
Type
Non-refereed

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