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Cold dust but warm gas in the unusual elliptical galaxy NGC 4125

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Abstract
Data from the Herschel Space Observatory have revealed an unusual elliptical galaxy, NGC 4125, which has strong and extended submillimeter emission from cold dust but only very strict upper limits to its CO and Hi emission. Depending on the dust emissivity, the total dust mass is 2-5 x 10(6) M-circle dot. While the neutral gas-to-dust mass ratio is extremely low (<12-30), including the ionized gas traced by [CII] emission raises this limit to <39-100. The dust emission follows a similar r(1/4) profile to the stellar light and the dust to stellar mass ratio is toward the high end of what is found in nearby elliptical galaxies. We suggest that NGC 4125 is currently in an unusual phase where evolved stars produced in a merger-triggered burst of star formation are pumping large amounts of gas and dust into the interstellar medium. In this scenario, the low neutral gas-to-dust mass ratio is explained by the gas being heated to temperatures >= 10(4) K faster than the dust is evaporated. If galaxies like NGC 4125, where the far-infrared emission does not trace neutral gas in the usual manner, are common at higher redshift, this could have significant implications for our understanding of high redshift galaxies and galaxy evolution.
Keywords
MAGELLANIC-CLOUD, SCALING RELATIONS, MOLECULAR GAS, C-II, MU-M, infrared: galaxies, HERSCHEL REFERENCE SURVEY, NEARBY GALAXIES, STAR-FORMATION, INTERSTELLAR-MEDIUM, OBSCURED GALAXIES, galaxies: individual (NGC 4125), cD, galaxies: elliptical and lenticular, galaxies: ISM

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MLA
Wilson, CD, A Cridland, K Foyle, et al. “Cold Dust but Warm Gas in the Unusual Elliptical Galaxy NGC 4125.” ASTROPHYSICAL JOURNAL LETTERS 776.2 (2013): n. pag. Print.
APA
Wilson, C., Cridland, A., Foyle, K., Parkin, T., Cooper, E., Roussel, H., Sauvage, M., et al. (2013). Cold dust but warm gas in the unusual elliptical galaxy NGC 4125. ASTROPHYSICAL JOURNAL LETTERS, 776(2).
Chicago author-date
Wilson, CD, A Cridland, K Foyle, TJ Parkin, EM Cooper, H Roussel, M Sauvage, et al. 2013. “Cold Dust but Warm Gas in the Unusual Elliptical Galaxy NGC 4125.” Astrophysical Journal Letters 776 (2).
Chicago author-date (all authors)
Wilson, CD, A Cridland, K Foyle, TJ Parkin, EM Cooper, H Roussel, M Sauvage, MWL Smith, Maarten Baes, G Bendo, M Boquien, A Boselli, L Ciesla, DL Clements, A Cooray, Ilse De Looze, M Galametz, W Gear, V Lebouteiller, S Madden, M Pereira-Santaella, and A Rémy-Ruyer. 2013. “Cold Dust but Warm Gas in the Unusual Elliptical Galaxy NGC 4125.” Astrophysical Journal Letters 776 (2).
Vancouver
1.
Wilson C, Cridland A, Foyle K, Parkin T, Cooper E, Roussel H, et al. Cold dust but warm gas in the unusual elliptical galaxy NGC 4125. ASTROPHYSICAL JOURNAL LETTERS. 2013;776(2).
IEEE
[1]
C. Wilson et al., “Cold dust but warm gas in the unusual elliptical galaxy NGC 4125,” ASTROPHYSICAL JOURNAL LETTERS, vol. 776, no. 2, 2013.
@article{4385321,
  abstract     = {Data from the Herschel Space Observatory have revealed an unusual elliptical galaxy, NGC 4125, which has strong and extended submillimeter emission from cold dust but only very strict upper limits to its CO and Hi emission. Depending on the dust emissivity, the total dust mass is 2-5 x 10(6) M-circle dot. While the neutral gas-to-dust mass ratio is extremely low (<12-30), including the ionized gas traced by [CII] emission raises this limit to <39-100. The dust emission follows a similar r(1/4) profile to the stellar light and the dust to stellar mass ratio is toward the high end of what is found in nearby elliptical galaxies. We suggest that NGC 4125 is currently in an unusual phase where evolved stars produced in a merger-triggered burst of star formation are pumping large amounts of gas and dust into the interstellar medium. In this scenario, the low neutral gas-to-dust mass ratio is explained by the gas being heated to temperatures >= 10(4) K faster than the dust is evaporated. If galaxies like NGC 4125, where the far-infrared emission does not trace neutral gas in the usual manner, are common at higher redshift, this could have significant implications for our understanding of high redshift galaxies and galaxy evolution.},
  articleno    = {L30},
  author       = {Wilson, CD and Cridland, A and Foyle, K and Parkin, TJ and Cooper, EM and Roussel, H and Sauvage, M and Smith, MWL and Baes, Maarten and Bendo, G and Boquien, M and Boselli, A and Ciesla, L and Clements, DL and Cooray, A and De Looze, Ilse and Galametz, M and Gear, W and Lebouteiller, V and Madden, S and Pereira-Santaella, M and Rémy-Ruyer, A},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {MAGELLANIC-CLOUD,SCALING RELATIONS,MOLECULAR GAS,C-II,MU-M,infrared: galaxies,HERSCHEL REFERENCE SURVEY,NEARBY GALAXIES,STAR-FORMATION,INTERSTELLAR-MEDIUM,OBSCURED GALAXIES,galaxies: individual (NGC 4125),cD,galaxies: elliptical and lenticular,galaxies: ISM},
  language     = {eng},
  number       = {2},
  pages        = {5},
  title        = {Cold dust but warm gas in the unusual elliptical galaxy NGC 4125},
  url          = {http://dx.doi.org/10.1088/2041-8205/776/2/L30},
  volume       = {776},
  year         = {2013},
}

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