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Dust evolution in the dwarf galaxy Holmberg II

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Abstract

A detailed photometric study of star-forming regions (SFRs) in the galaxy Holmberg II has been carried out using the archival observational data from the far infrared to the ultraviolet obtained with the GALEX, Spitzer, and Herschel telescopes. Spectroscopic observations with the 6-m BTA telescope (Special Astrophysical Observatory of the Russian Academy of Sciences) are used to estimate the ages and metallicities of SFRs. The ages of SFRs have been correlated for the first time with their emission parameters in a wide spectral range and with the physical parameters determined by fitting the observed spectra. It is shown that the fluxes at 8 and 24 µm characterizing the emission from polycyclic aromatic hydrocarbons (PAHs) and hot dust grains decrease with age, but their ratio increases. This implies that the relative contribution from PAHs to the total infrared flux increases with age. It is hypothesized that the detected increase in the ratio of the fluxes at 8 and 24 µm is related to the increase in the relative PAH fraction due to the destruction of larger grains.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya ul. 48, Moscow, 109017, Russia

    D. S. Wiebe & M. S. Khramtsova

  2. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia

    O. V. Egorov & T. A. Lozinskaya

Authors
  1. D. S. Wiebe
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  2. M. S. Khramtsova
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  3. O. V. Egorov
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  4. T. A. Lozinskaya
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Correspondence to D. S. Wiebe.

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Original Russian Text © D.S. Wiebe, M.S. Khramtsova, O.V. Egorov, T.A. Lozinskaya, 2014, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2014, Vol. 40, No. 5, pp. 316–329.

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Wiebe, D.S., Khramtsova, M.S., Egorov, O.V. et al. Dust evolution in the dwarf galaxy Holmberg II. Astron. Lett. 40, 278–290 (2014). https://doi.org/10.1134/S1063773714050065

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  • DOI: https://doi.org/10.1134/S1063773714050065

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