Abstract
Dwarf elliptical galaxies (dEs) are the most common galaxy type in nearby galaxy clusters; even so, many of their basic properties have yet to be quantified. Here we present the results of our study of 4 Virgo dwarf ellipticals obtained with the SAURON integral field unit on the William Herschel Telescope (La Palma, Spain). While traditional long-slit observations are likely to miss more complicated kinematic features, with SAURON we are able to study both kinematics and stellar populations in two dimensions, obtaining a much more detailed view of the mass distribution and star formation histories. What is visible even in such a small sample is that dEs are not a uniform group, not only morphologically, but also as far as their kinematic and stellar population properties are concerned. We find the presence of substructures, varying degrees of flattening and of rotation, as well as differences in age and metallicity gradients. We confirm that two of our galaxies are significantly flattened, yet non-rotating objects, which makes them likely triaxial systems. The comparison between the dwarf and the giant groups shows that dEs could be a low-mass extension of Es in the sense that they do seem to follow the same trends with mass. However, dEs as progenitors of Es seem less likely as we have seen that dEs have much lower abundance ratios.
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Notes
- 1.
\([\mathrm{MgFe50}] = \frac{0.69\cdot \mathrm{Mg}b+\mathrm{Fe}5015} {2}\).
- 2.
M\({}_{\mathit{dyn}} = 5.0 \cdot {R}_{e} \cdot {\sigma }_{e}^{2}/G\).
References
Beasley, M.A., Cenarro, A.J., Strader, J., Brodie, J.P.: Evidence for the Disky origin of luminous virgo dwarf ellipticals from the kinematics of their globular cluster systems. AJ 137, 5146–5153 (2009)
Cappellari, M., Emsellem, E.: Parametric recovery of line-of-sight velocity distributions from absorption-line spectra of galaxies via penalized likelihood. PASP 116, 138–147 (2004)
Cervantes, J.L., Vazdekis, A.: An optimized Hβ index for disentangling stellar population ages. MNRAS 392, 691–704 (2009)
Chilingarian, I.V.: Evolution of dwarf early-type galaxies - I. Spatially resolved stellar populations and internal kinematics of Virgo cluster dE/dS0 galaxies. MNRAS 394, 1229–1248 (2009)
Emsellem, E., Cappellari, M., Krajnović, D., van de Ven, G., Bacon, R., Bureau, M., Davies, R.L., de Zeeuw, P.T., Falcón-Barroso, J., Kuntschner, H., McDermid, R., Peletier, R.F., Sarzi, M.: The SAURON project - IX. A kinematic classification for early-type galaxies. MNRAS 379, 401–417 (2007)
Emsellem, E., Cappellari, M., Peletier, R.F., McDermid, R.M., Bacon, R., Bureau, M., Copin, Y., Davies, R.L., Krajnović, D., Kuntschner, H., Miller, B.W., de Zeeuw, P.T.: The SAURON project - III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies. MNRAS 352, 721–743 (2004)
Geha, M., Guhathakurta, P., van der Marel, R.P.: Internal dynamics, structure, and formation of dwarf elliptical galaxies. II. Rotating versus nonrotating dwarfs. AJ 126, 1794–1810 (2003)
Kormendy, J., Fisher, D.B., Cornell, M.E., Bender, R.: Structure and formation of elliptical and spheroidal galaxies. ApJS 182, 216–309 (2009)
Kuntschner, H., Emsellem, E., Bacon, R., Bureau, M., Cappellari, M., Davies, R.L., de Zeeuw, P.T., Falcón-Barroso, J., Krajnović, D., McDermid, R.M., Peletier, R.F., Sarzi, M.: The SAURON project - VI. Line strength maps of 48 elliptical and lenticular galaxies. MNRAS 369, 497–528 (2006)
Kuntschner, H., Emsellem, E., Bacon, R., Cappellari, M., Davies, R.L., de Zeeuw, P.T., Falcón-Barroso, J., Krajnović, D., McDermid, R.M., Peletier, R.F., Sarzi, M., Shapiro, K.L., van den Bosch, R.C.E., van de Ven, G.: The SAURON project - XVII. Stellar population analysis of the absorption line strength maps of 48 early-type galaxies. MNRAS 408, 97–132 (2010)
Lisker, T., Grebel, E.K., Binggeli, B.: Virgo cluster early-type dwarf galaxies with the sloan digital sky survey. I. On the possible disk nature of bright early-type dwarfs. AJ 132, 497–513 (2006)
McDermid, R.M., Emsellem, E., Shapiro, K.L., Bacon, R., Bureau, M., Cappellari, M., Davies, R.L., de Zeeuw, T., Falcón-Barroso, J., Krajnović, D., Kuntschner, H., Peletier, R.F., Sarzi, M.: The SAURON project - VIII. OASIS/CFHT integral-field spectroscopy of elliptical and lenticular galaxy centres. MNRAS 373, 906–958 (2006)
Michielsen, D., Boselli, A., Conselice, C.J., Toloba, E., Whiley, I.M., Aragón-Salamanca, A., Balcells, M., Cardiel, N., Cenarro, A.J., Gorgas, J., Peletier, R.F., Vazdekis, A.: The relation between stellar populations, structure and environment for dwarf elliptical galaxies from the MAGPOP-ITP. MNRAS 385, 1374–1392 (2008)
Thomas, D., Maraston, C., Bender, R.: The epochs of early-type galaxy formation. Ap&SS 281, 371–374 (2002)
Toloba, E., Boselli, A., Cenarro, A.J., Peletier, R.F., Gorgas, J., Gil de Paz, A., Munoz-Mateos, J.C.: Formation and evolution of dwarf early-type galaxies in the Virgo cluster I. Internal kinematics. ArXiv e-prints (2010)
Trentham, N., Hodgkin, S.: The luminosity function of the Virgo Cluster from \(\mathrm{MB} = -22\) to − 11. MNRAS 333, 423–442 (2002)
Vazdekis, A.: Evolutionary stellar population synthesis at 2 Å spectral resolution. ApJ 513, 224–241 (1999)
Vazdekis, A., Sánchez-Blázquez, P., Falcón-Barroso, J., Cenarro, A.J., Beasley, M.A., Cardiel, N., Gorgas, J., Peletier, R.F.: Evolutionary stellar population synthesis with MILES - I. The base models and a new line index system. MNRAS 404, 1639–1671 (2010)
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Ryś, A., Falcón-Barroso, J. (2012). A SAURON Study of Dwarf Elliptical Galaxies in the Virgo Cluster: Kinematics and Stellar Populations. In: Papaderos, P., Recchi, S., Hensler, G. (eds) Dwarf Galaxies: Keys to Galaxy Formation and Evolution. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22018-0_17
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