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Dust and ionized gas association in E/S0 galaxies with dust lanes: clues to their origin

Authors

  • Ido Finkelman,

    Corresponding author
    1. The Wise Observatory and the School of Physics and Astronomy, the Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
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  • Noah Brosch,

    1. The Wise Observatory and the School of Physics and Astronomy, the Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
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  • José G. Funes S. J.,

    1. Vatican Observatory, V-00120 Vatican City State, Italy
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  • Sudhanshu Barway,

    1. South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa
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  • Alexei Kniazev,

    1. South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa
    2. Southern African Large Telescope Foundation, PO Box 9, 7935 Observatory, Cape Town, South Africa
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  • Petri Väisänen

    1. South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa
    2. Southern African Large Telescope Foundation, PO Box 9, 7935 Observatory, Cape Town, South Africa
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E-mail: ido@wise.tau.ac.il

ABSTRACT

We present results from an ongoing programme to study the dust and ionized gas in E/S0 galaxies with dust lanes. Our data, together with results from previous studies of E/S0 galaxies, are used to demonstrate the close relationship between these two components. This relationship is discussed in light of our current understanding of the nature and origin of the interstellar medium (ISM), and in particular in the context of the interplay between the different multi-temperature components. We show that focusing on dust obscured regions as tracers of the ISM, and on their properties, serves as independent evidence for the external origin of the dust and ionized gas.

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