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Astron. Astrophys. 342, 671-686 (1999)

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Dark matter in early-type spiral galaxies: the case of NGC 2179 and of NGC 2775 * **

E.M. Corsini 1, A. Pizzella 2, M. Sarzi 3, P. Cinzano 3, J.C. Vega Beltrán 4, J.G. Funes S.J. 3, F. Bertola 3, M. Persic 5 and P. Salucci 6

1 Osservatorio Astrofisico di Asiago, Dipartimento di Astronomia, Università di Padova, via dell'Osservatorio 8, I-36012 Asiago, Italy
2 European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
3 Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
4 Osservatorio Astronomico di Padova, Telescopio Nazionale Galileo, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
5 Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34131 Trieste, Italy
6 SISSA, via Beirut 2-4, I-34013 Trieste, Italy

Received 8 June 1998 / Accepted 3 November 1998

Abstract

We present the stellar and ionized-gas velocity curves and velocity-dispersion profiles along the major axis for six early-type spiral galaxies.

Two of these galaxies, namely NGC 2179 and NGC 2775, are particularly suited for the study of dark matter halos. Using their luminosity profiles and modeling their stellar and gaseous kinematics, we derive the mass contributions of the luminous and the dark matter to the total potential. In NGC 2179 we find that the data (measured out to about the optical radius [FORMULA]) unambiguously require the presence of a massive dark halo. For the brighter and bigger object NGC 2775, we can rule out a significant halo contribution at radii [FORMULA]. Although preliminary, these results agree with the familiar mass distribution trend known for late-type spirals of comparable mass.

Key words: galaxies: individual: NGC 2179 – galaxies: individual: NGC 2775 – galaxies: kinematics and dynamics – galaxies: spiral – cosmology: dark matter

* Based on observations carried out at ESO, La Silla (Chile) (ESO N. 52, 1-020) and on observations obtained with the VATT: the Alice P. Lennon Telescope and the Thomas J. Bannan Astrophysics Facility.
** Tables 4 to 42 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html.

Send offprint requests to: E.M. Corsini

Correspondence to: (corsini@pd.astro.it)

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© European Southern Observatory (ESO) 1999

Online publication: February 23, 1999
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