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Issue A&A
Volume 383, Number 2, February IV 2002
Page(s) 390 - 397
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011784



A&A 383, 390-397 (2002)
DOI: 10.1051/0004-6361:20011784

ESO 603-G21: A strange polar-ring galaxy

V. P. Reshetnikov1, 2, M. Faúndez-Abans3 and M. de Oliveira-Abans3

1  Astronomical Institute of St.Petersburg State University, 198504 St. Petersburg, Russia
2  Isaac Newton Institute of Chile, St. Petersburg Branch, Russia
3  MCT/Laboratório Nacional de Astrofísica, Caixa Postal 21, CEP:37.504-364, Itajubá, MG, Brazil
    e-mail: mfaundez@lna.br, mabans@lna.br

(Received 16 August 2001 / Accepted 26 November 2001 )

Abstract
We present the results of B, V, R surface photometry of ESO 603-G21 - a galaxy with a possible polar ring. The morphological and photometric features of this galaxy are discussed. The central round object of the galaxy is rather red and presents a nearly exponential surface brightness distribution. This central structure is surrounded by a blue warped ring or disk. The totality of the observed characteristics (optical and NIR colors, strong color gradients, HI and H 2 content, FIR luminosity and star-formation rate, rotation-curve shape, global mass-to-luminosity ratio, the agreement with the Tully-Fisher relation, etc.) shows that ESO 603-G21 is similar to late-type spiral galaxies. We suppose that morphological peculiarities and the possible existence of two large-scale kinematically-decoupled subsystems in ESO 603-G21 can be explained as being a result of dissipative merging of two spiral galaxies or as a consequence of a companion accretion onto a pre-existing spiral host.


Key words: galaxies: individual: ESO 603-G21 -- galaxies: kinematics and dynamics -- galaxies: photometry -- galaxies: formation -- galaxies: structure

Offprint request: V. P. Reshetnikov, resh@astro.spbu.ru

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© ESO 2002


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