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Systematic Variation of Central Mass Density Slope in Early-Type Galaxies

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Book cover The Universe of Digital Sky Surveys

Part of the book series: Astrophysics and Space Science Proceedings ((ASSSP,volume 42))

Abstract

We study the total density distribution in the central regions (\(\lesssim 1\) effective radius, R e) of early-type galaxies (ETGs), using data from the SPIDER survey (La Barbera et al., MNRAS 408:1313, 2010). We model each galaxy with two components (dark matter halo + stars), exploring different assumptions for the dark matter (DM) halo profile, and leaving stellar mass-to-light (M ⋆∕L) ratios as free fitting parameters to the data. For a Navarro et al. (ApJ 462:563, 1996) profile, the slope of the total mass profile is non-universal. For the most massive and largest ETGs, the profile is isothermal in the central regions (\(\sim \mbox{ $R_{\mathrm{e}}$}/2\)), while for the low-mass and smallest systems, the profile is steeper than isothermal, with slopes similar to those for a constant-M∕L profile. For a concentration-mass relation steeper than that expected from simulations, the correlation of density slope with mass tends to flatten. Our results clearly point to a “non-homology” in the total mass distribution of ETGs, which simulations of galaxy formation suggest may be related to a varying role of dissipation with galaxy mass.

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Acknowledgements

CT has received funding from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement n. 267251 “Astronomy Fellowships in Italy” (AstroFIt)

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Authors and Affiliations

  1. INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, 80131, Napoli, Italy

    C. Tortora, F. La Barbera & N. R. Napolitano

  2. Department of Physics and Astronomy, San José State University, San Jose, CA, 95192, USA

    A. J. Romanowsky

  3. University of California Observatories, 1156 High Street, Santa Cruz, CA, 95064, USA

    A. J. Romanowsky

  4. Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK

    I. Ferreras

  5. Instituto Nacional de Pesquisas Espaciais/MCTI Av. dos Astronautas 1758, Jd. Granja São José dos Campos, 12227-010, SP, Brazil

    R. R. de Carvalho

Authors
  1. C. Tortora
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  2. F. La Barbera
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  3. N. R. Napolitano
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  4. A. J. Romanowsky
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  5. I. Ferreras
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  6. R. R. de Carvalho
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Corresponding author

Correspondence to C. Tortora .

Editor information

Editors and Affiliations

  1. INAF - Observatory of Capodimonte, Napoli, Italy

    Nicola R. Napolitano

  2. Department of Physics “Ettore Pancini”, University “Federico II”, Naples, Italy

    Giuseppe Longo

  3. INAF - Observatory of Capodimonte, Napoli, Italy

    Marcella Marconi

  4. Department of Physics “Ettore Pancini”, University "Federico II", Napoli, Italy

    Maurizio Paolillo

  5. INAF - Observatory of Capodimonte, Naples, Italy

    Enrichetta Iodice

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© 2016 Springer International Publishing Switzerland

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Tortora, C., La Barbera, F., Napolitano, N.R., Romanowsky, A.J., Ferreras, I., de Carvalho, R.R. (2016). Systematic Variation of Central Mass Density Slope in Early-Type Galaxies. In: Napolitano, N., Longo, G., Marconi, M., Paolillo, M., Iodice, E. (eds) The Universe of Digital Sky Surveys. Astrophysics and Space Science Proceedings, vol 42. Springer, Cham. https://doi.org/10.1007/978-3-319-19330-4_33

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