NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T22:16:12 PDT
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For refcode 2017MNRAS.465.3741D:
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Copyright by Royal Astronomical Society. 2017MNRAS.465.3741D The interstellar medium in Andromeda's dwarf spheroidal galaxies - II. Multiphase gas content and ISM conditions De Looze, Ilse; Baes, Maarten; Cormier, Diane; Kaneko, Hiroyuki; Kuno, Nario; Young, Lisa; Bendo, George J.; Boquien, Mederic; Fritz, Jacopo; Gentile, Gianfranco; Kennicutt, Robert C.; Madden, Suzanne C.; Smith, Matthew W. L.; Wilson, Christine D. Abstract. We make an inventory of the interstellar medium material in three low-metallicity dwarf spheroidal galaxies of the Local Group (NGC 147, NGC 185 and NGC 205). Ancillary H I, CO, Spitzer Infrared Spectrograph spectra, Halpha and X-ray observations are combined to trace the atomic, cold and warm molecular, ionized and hot gas phases. We present new Nobeyama CO(1-0) observations and Herschel SPIRE FTS [C I] observations of NGC 205 to revise its molecular gas content. We derive total gas masses of M_g_ = 1.9-5.5 x 10^5^ M_&sun;_ for NGC 185 and M_g_ = 8.6-25.0 x 10^5^ M_&sun;_ for NGC 205. Non-detections combine to an upper limit on the gas mass of M_g_ <= 0.3-2.2 x 10^5^ M_&sun;_ for NGC 147. The observed gas reservoirs are significantly lower compared to the expected gas masses based on a simple closed-box model that accounts for the gas mass returned by planetary nebulae and supernovae. The gas-to-dust mass ratios GDR ~ 37-107 and 48-139 are also considerably lower compared to the expected GDR ~ 370 and 520 for the low metal abundances in NGC 185 (0.36 Z_&sun;_) and NGC 205 (0.25 Z_&sun;_), respectively. To simultaneously account for the gas deficiency and low gas-to-dust ratios, we require an efficient removal of a large gas fraction and a longer dust survival time (~1.6 Gyr). We believe that efficient galactic winds (combined with heating of gas to sufficiently high temperatures in order for it to escape from the galaxy) and/or environmental interactions with neighbouring galaxies are responsible for the gas removal from NGC 147, NGC 185 and NGC 205. Key words: ISM: evolution, galaxies: dwarf, galaxies: individual: NGC 147, NGC 185, NGC 205, Local Group, infrared: ISM
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