galaxies: individual: M83 NGC 5236; galaxies: kinematics and dynamics; galaxies: nuclei; galaxies: starburst; galaxies: structure
Abstract :
[en] The barred grand-design spiral M83 (NGC 5236) is one of the most studied galaxies given its proximity, orientation, and particular complexity. Nonetheless, many aspects of the central regions remain controversial, conveying our limited understanding of the inner gas and stellar kinematics, and ultimately of the nucleus evolution. In this work, we present AO VLT-SINFONI data of its central ~235 × 140 pc with an unprecedented spatial resolution of ~0.2 arcsec, corresponding to ~4 pc. We have focused our study on the distribution and kinematics of the stars and the ionized and molecular gas by studying the Paα and Brγ emission in detail, the H2 1-0S(1) line at 2.122 μm, and the [Fe II] line at 1.644 μm, together with the CO absorption bands at 2.293 μm and 2.323 μm. Our results reveal a complex situation where the gas and stellar kinematics are totally unrelated. Supernova explosions play an important role in shaping the gas kinematics, dominated by shocks and inflows at scales of tens of parsecs that make them unsuitable to derive general dynamical properties. We propose that the location of the nucleus of M83 is unlikely to be related to the off-center "optical nucleus." The study of the stellar kinematics reveals that the optical nucleus is a gravitationally bound massive star cluster with M dyn = (1.1 ± 0.4) × 107 M ⊙, formed by a past starburst. The kinematic and photometric analysis of the cluster yield that the stellar content of the cluster is well described by an intermediate age population of log T(yr) = 8.0 ± 0.4, with a mass of M sstarf ~= (7.8 ± 2.4) × 106 M ⊙.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Piqueras López, J.; Centro de Astrobiología, INTA-CSIC
Barth, A. J., Strigari, L. E., Bentz, M. C., Greene, J. E., & Ho, L. C. 2009, ApJ, 690, 1031
Basu-Zych, A. R., Gonçalves, T. S., & Overzier, R. et al. 2009, ApJ, 699, L118
Bournaud, F., Combes, F., Jog, C. J., & Puerari, I. 2005, A&A, 438, 507 (Pubitemid 41092347)
Burton, M. G., Hollenbach, D. J., Haas, M. R., & Erickson, E. F. 1990, ApJ, 355, 197
Cappellari, M. & Copin, Y. 2003, MNRAS, 342, 345 (Pubitemid 37268730)
Cappellari, M. & Emsellem, E. 2004, PASP, 116, 138
Cohen, M., Wheaton, W. A., & Megeath, S. T. 2003, AJ, 126, 1090 (Pubitemid 37177772)
Colina, L. 1993, ApJ, 411, 565
Comte, G. 1981, A&AS, 44, 441
Crosthwaite, L. P., Turner, J. L., Buchholz, L., Ho, P. T. P., & Martin, R. N. 2002, AJ, 123, 1892 (Pubitemid 37189089)
Dale, D. A., Cohen, S. A., & Johnson, L. C. et al. 2009, ApJ, 703, 517
Davies, R. 2008, The 2007 ESO Calibration Workshop, ESO Astrophysics Symp., ed. A. Kaufer & F. Kerber (Berlin: Springer-Verlag), 249
Davies, R., Förster Schreiber, N. M., & Cresci, G. et al. 2011, ApJ, 741, 69
Davies, R. I. 2007, MNRAS, 375, 1099
Davies, R. I., Sternberg, A., Lehnert, M., & Tacconi-Garman, L. E. 2003, ApJ, 597, 907 (Pubitemid 38202788)
Díaz, R. J., Dottori, H., & Aguero, M. P. et al. 2006, ApJ, 652, 1122
Dopita, M. A., Blair, W. P., & Long, K. S. et al. 2010, ApJ, 710, 964
Dopita, M. A. & Sutherland, R. S. 1995, ApJ, 455, 468 (Pubitemid 126008229)
Dopita, M. A. & Sutherland, R. S. 1996, ApJS, 102, 161
Eisenhauer, F., Abuter, R., & Bickert, K. et al. 2003, Proc. SPIE, 4841, 1548
Elmegreen, D. M., Chromey, F. R., & Warren, A. R. 1998, AJ, 116, 2834
Fathi, K., Beckman, J. E., & Lundgren, A. A. et al. 2008, ApJ, 675, L17
Förster-Schreiber, N., Genzel, R., & Bouché, N. et al. 2009, ApJ, 706, 1364
Grimm, H.-J., Gilfanov, M., & Sunyaev, R. 2003, MNRAS, 339, 793 (Pubitemid 37282165)
Hägele, G. F., Díaz, Á. I., Cardaci, M. V., Terlevich, E., & Terlevich, R. 2009, MNRAS, 396, 2295
Harris, J., Calzetti, D., Gallagher, J. S., Conselice, C. J., & Smith, D. A. 2001, AJ, 122, 3046 (Pubitemid 33591795)
Hopkins, P. F. & Quataert, E. 2010, MNRAS, 405, L41
Houghton, R. C. W. & Thatte, N. 2008, MNRAS, 385, 1110
Knapen, J. H., Sharp, R. G., & Ryder, S. D. et al. 2010, MNRAS, 408, 797
Leitherer, C., Schaerer, D., & Goldader, J. D. et al. 1999, ApJS, 123, 3
Maraston, C. 2005, MNRAS, 362, 799 (Pubitemid 41337277)
Marconi, A. & Hunt, L. K. 2003, ApJ, 589, L21 (Pubitemid 37394789)
Mast, D., Díaz, R. J., & Agüero, M. P. 2006, AJ, 131, 1394 (Pubitemid 43461514)
McCrady, N. & Graham, J. R. 2007, ApJ, 663, 844
Peng, C. Y., Ho, L. C., Impey, C. D., & Rix, H.-W. 2010, AJ, 139, 2097
Puxley, P. J., Hawarden, T. G., & Mountain, C. M. 1990, ApJ, 364, 77
Raymond, J. C. 2001, Space Sci. Rev., 99, 209
Rodrigues, I., Dottori, H., Díaz, R. J., Agüero, M. P., & Mast, D. 2009, AJ, 137, 4083
Saikia, D. J., Pedlar, A., Unger, S. W., & Axon, D. J. 1994, MNRAS, 270, 46
Sakamoto, K., Matsushita, S., Peck, A. B., Wiedner, M. C., & Iono, D. 2004, ApJ, 616, L59
Skrutskie, M. F., Cutri, R. M., & Stiening, R. et al. 2006, AJ, 131, 1163 (Pubitemid 43268387)
Soria, R. & Wu, K. 2002, A&A, 384, 99
Thatte, N., Tecza, M., & Genzel, R. 2000, A&A, 364, L47
Tremaine, S. 1995, AJ, 110, 628
Tremaine, S., Gebhardt, K., & Bender, R. et al. 2002, ApJ, 574, 740 (Pubitemid 37083981)
Walcher, C. J., van der Marel, R. P., & McLaughlin, D. et al. 2005, ApJ, 618, 237 (Pubitemid 40272982)
Wiklind, T., Lundgren-Andersson, A., & Olofsson, H. 2004, The Interplay among Black Holes, Stars and ISM in Galactic Nuclei (Proc. IAU Symp. 222), ed. T. Storchi Bergmann, L.C. Ho, & H. R. Schmitt (Cambridge: Cambridge Univ. Press), 219
Winge, C., Riffel, R. A., & Storchi-Bergmann, T. 2009, ApJS, 185, 186
Wright, C. O., Egan, M. P., Kraemer, K. E., & Price, S. D. 2003, AJ, 125, 359