Abstract
We present the results of our photometric (BV R) and spectroscopic CCD observations of NGC 304 and NGC 7625, candidate polar-ring galaxies, performed with the 6-m Special Astrophysical Observatory telescope. For NGC 304, such a study has been carried out for the first time. We have obtained basic integrated characteristics of the galaxies and determined their morphological types (S0 for NGC 304 and Sa for NGC 7625). The absolute magnitudes of the galaxies, M B = −20m.81 for NGC 304 and M B = −19m.34 for NGC7625, are indicative of their fairly high luminosities. The disk and bulge parameters have been determined forNGC 304 (µ0 = 20m.60, h = 3.86 kpc, µ e = 21m.59, r e = 1.26 kpc in the B band); these correspond to the parameters of S0-type objects. The rotation velocity for NGC 304 (200 km s−1) reaches its maximum at a galactocentric distance of 3.1 kpc, which yields a mass estimate for the galaxy of 2.8 × 1010 \( \mathcal{M}_ \odot \). The observed photometric features at the center of NGC 304 indicate that it may have an inner ring structure, although we have failed to confirm the existence of two kinematic systems based on our spectroscopic observations. In NGC 7625, the disk makes a dominant contribution to the total brightness. The derived integrated color indices (B-V = 0m.81 and V-R = 0m.61) agree with previous determinations of other authors. We have estimated the учештсешщт in the inner galactic regions. In the outer regions, we have detected structures with bluer colors (B-V = 0m.60), which may be indicative of a polar ring with a minor stellar component.
Similar content being viewed by others
References
N. Broch and F. Loinger, Astron. Astrophys. 249, 327 (1991).
R. Buta, S. Mitra, G. de Vaucouleurs, et al., Astron. J. 107, 118 (1994).
R. Buta and K. L. Williams, Astron. J. 109, 543 (1995).
M. Cairos Luz, N. Caon, M. Vilchez, et al., Astrophys. J., Suppl. Ser. 136, 393 (2001).
M.-H. Demoulin, Astrophys. J. 157, 69 (1969).
D. A. Hunter, J. S. Gallagher, and D. Rautenkrantz, Astrophys. J., Suppl. Ser. 49, 53 (1982).
A. U. Landolt, Astron. J. 88, 439 (1983).
G. J. Li, E. R. Seaquist, J. M. Wrobel, et al., Astrophys. J. 413, 150 (1993).
G. Longo and A. de Vaucouleurs, A General Catalog of Photoelectric Magnitudes and Colors in the U,B, V System of 3578 Galaxies Brighter Than 16-th V-magnitude, University of Texas Monograph in Astronomy, No. 3 (1983).
N. Y. Lu, Astrophys. J. 506, 673 (1998).
B. T. Lynds and I. Furenlid, Astrophys. J. 186, 445 (1973).
D. Schlegel, D. Finkbeiner, and M. Davis, Astrophys. J. 500, 523 (1998).
B. C. Whitmore, R. A. Lucas, D. B. McElroy, et al., Astron. J. 100, 1489 (1990).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © G.M. Karataeva, A.N. Kuznetsov, 2008, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2008, Vol. 34, No. 9, pp. 673–684.
Rights and permissions
About this article
Cite this article
Karataeva, G.M., Kuznetsov, A.N. Observational study of the candidate polar-ring galaxies NGC 304 and NGC 7625. Astron. Lett. 34, 608–619 (2008). https://doi.org/10.1134/S1063773708090041
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063773708090041