Abstract
Highly noncircular outer stellar disks have been detected in two SA0 (unbarred) galaxies by comparing the spectroscopic data on the rotation of stars and the photometric data on the shape and orientation of isophotes. In NGC 502, the oval distortion of the disk is manifested in the shape of the inner and outer elliptical rings occupying wide radial zones between the bulge and the disk and at the outer disk edge; such a structure can be a consequence of the so-called “dry minor merger,” multiple cannibalization of gas-free satellites. In NGC 5485, the stellar kinematics is absolutely unrelated to the orientation of isophotes in the disk region, and for this galaxy the conclusion about its global triaxial structure is unavoidable.
Similar content being viewed by others
References
V. L. Afanasiev and A. V. Moiseev, Astron. Lett. 31, 194 (2005).
V. L. Afanasiev and A. V. Moiseev, Baltic Astron. 20, 363 (2011).
D. R. Andersen, M. A. Bershady, L. S. Sparke, J. S. Gallagher III, and E. M. Wilcots, Astrophys. J. 551, L131 (2001).
R. Bacon, Y. Copin, G. Monnet, B. W. Miller, J. R. Allington-Smith, M. Bureau, C. M. Carollo, R. L. Davies, et al., Mon. Not. R. Astron. Soc. 326, 23 (2001).
M. Baes, F. Allaert, M. Sarzi, I. de Looze, J. Fritz, G. Gentile, T. M. Hughes, I. Puerari, M. W. L. Smith, and S. Viaene, Mon. Not. R. Astron. Soc. 444, L90 (2014).
M. Cappellari, E. Emsellem, D. Krajnovic, R. M. Mc-Dermid, N. Scott, G. A. Verdoes Kleijn, L. M. Young, K. Alatalo, et al., Mon. Not. R. Astron. Soc. 413, 813 (2011).
P.-A. Duc, J.-Ch. Cuillandre, E. Karabal, M. Cappellari, K. Alatalo, L. Blitz, F. Bournaud, M. Bureau, et al., Mon. Not. R. Astron. Soc. 446, 120 (2015).
M. Franx and T. de Zeeuw, Astrophys. J. 392, L47 (1992).
A. M. Garcia, Astron. Astrophys. Suppl. Ser. 100, 47 (1993).
R. Garcia-Benito, S. Zibetti, S. F. Sánchez, B. Husemann, A. L. de Amorin, A. Castillo-Morales, R. Cid Fernandes, S. C. Ellis, et al., Astron. Astrophys. 576, id135 (2015).
L. Gutiérrez, P. Erwin, R. Aladro, and J. E. Beckman, Astron. J. 142, 145 (2011).
J. P. Huchra and M. J. Geller, Astrophys. J. 257, 423 (1982).
M. A. Il’ina and O. K. Sil’chenko, Astron. Rep. 56, 578 (2012).
D. Krajnovic, E. Emsellem, M. Cappellari, K. Alatalo, L. Blitz, M. Bois, F. Bournaud, M. Bureau, et al., Mon. Not. R. Astron. Soc. 414, 2923 (2011).
E. Laurikainen, H. Salo, R. Buta, J. H. Knapen, and S. Comerón, Mon. Not. R. Astron. Soc. 405, 1089 (2010).
E. Laurikainen, H. Salo, R. Buta, and J. H. Knapen, Mon. Not. R. Astron. Soc. 418, 1452 (2011).
J. Méndez-Abreu, J. A. L. Aguerri, E. M. Corsini, and E. Simonneau, Astron. Astrophys. 478, 353 (2008).
A. V. Moiseev, J. R. Valdés, and V. H. Chavushyan, Astron. Astrophys. 421, 433 (2004).
H.-W. Rix and D. Zaritsky, Astrophys. J. 447, 82 (1995).
S. F. Sánchez, R. C. Kennicutt, A. Gil de Paz, G. van de Ven, J. M. Vilchez, L. Wisotzki, C. J. Walcher, D. Mast, et al., Astron. Astrophys. 538, id. 8 (2012).
K. Sheth, M. Regan, J. L. Hinz, A. Gil de Paz, K. Menéndez-Delmestre, J.-K. Munoz-Mateos, M. Seibert, T. Kim, et al., Publ. Astron. Soc. Pacif. 122, 1397 (2010).
O. K. Sil’chenko, Astron. Lett. 31, 227 (2005).
O. K. Sil’chenko, IAU Symp. 245, 277 (2008).
O. K. Sil’chenko, Astron. J. (2016, submitted).
G. Theureau, M. O. Hanski, N. Coudreau, N. Hallet, and J.-M. Martin, Astron. Astrophys. 465, 71 (2007).
G. de Vaucouleurs, A. de Vaucouleurs, H. G. Corwin, R. J. Buta, G. Paturel, and P. Fouque, Third Reference Catalogue of Bright Galaxies (Springer, Berlin, Heidelberg, New York, 1991), p. 2069.
S. J. Wagner, R. Bender, and C. Moellenhoff, Astron. Astrophys. 195, L5 (1988).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © O.K. Sil’chenko, 2016, published in Pis’ma v Astronomicheskii Zhurnal, 2016, Vol. 42, No. 3, pp. 189–199.
Rights and permissions
About this article
Cite this article
Sil’chenko, O.K. Noncircular outer disks in unbarred S0 galaxies: NGC 502 and NGC 5485. Astron. Lett. 42, 163–172 (2016). https://doi.org/10.1134/S1063773716030051
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063773716030051