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The gas-to-dust mass ratio of Centaurus A as seen by Herschel

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Abstract
We present photometry of the nearby galaxy NGC 5128 (Centaurus A) observed with the Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) instruments on board the Herschel Space Observatory, at 70, 160, 250, 350 and 500 mu m, as well as new CO J= 32 observations taken with the HARP-B instrument on the James Clerk Maxwell Telescope (JCMT). Using a single-component modified blackbody, we model the dust spectral energy distribution within the disc of the galaxy using all five Herschel wavebands and find dust temperatures of similar to 30 K towards the centre of the disc and a smoothly decreasing trend to similar to 20 K with increasing radius. We find a total dust mass of (1.59 +/- 0.05) x 107 M? and a total gas mass of (2.7 +/- 0.2) x 109 M?. The average gas-to-dust mass ratio is 103 +/- 8, but we find an interesting increase in this ratio to approximately 275 towards the centre of Cen A. We discuss several possible physical processes that may be causing this effect, including dust sputtering, jet entrainment and systematic variables such as the XCO factor. Dust sputtering by X-rays originating in the active galactic nucleus or the removal of dust by the jets is our most favoured explanation.
Keywords
TELESCOPE NEARBY GALAXIES, COOL INTERSTELLAR-MEDIUM, NEUTRAL HYDROGEN OBSERVATIONS, FAR-INFRARED EMISSION, EARLY-TYPE GALAXIES, submillimetre: ISM, infrared: ISM, galaxies: individual: Centaurus A, galaxies: ISM, NGC 5128 CENTAURUS, MOLECULAR GAS, ELLIPTIC GALAXIES, STAR-FORMATION, COLD DUST

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Chicago
Parkin, TJ, CD Wilson, K Foyle, Maarten Baes, GJ Bendo, A Boselli, M Boquien, et al. 2012. “The Gas-to-dust Mass Ratio of Centaurus A as Seen by Herschel.” Monthly Notices of the Royal Astronomical Society 422 (3): 2291–2301.
APA
Parkin, T., Wilson, C., Foyle, K., Baes, M., Bendo, G., Boselli, A., Boquien, M., et al. (2012). The gas-to-dust mass ratio of Centaurus A as seen by Herschel. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 422(3), 2291–2301.
Vancouver
1.
Parkin T, Wilson C, Foyle K, Baes M, Bendo G, Boselli A, et al. The gas-to-dust mass ratio of Centaurus A as seen by Herschel. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2012;422(3):2291–301.
MLA
Parkin, TJ, CD Wilson, K Foyle, et al. “The Gas-to-dust Mass Ratio of Centaurus A as Seen by Herschel.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 422.3 (2012): 2291–2301. Print.
@article{3001132,
  abstract     = {We present photometry of the nearby galaxy NGC 5128 (Centaurus A) observed with the Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) instruments on board the Herschel Space Observatory, at 70, 160, 250, 350 and 500 mu m, as well as new CO J= 32 observations taken with the HARP-B instrument on the James Clerk Maxwell Telescope (JCMT). Using a single-component modified blackbody, we model the dust spectral energy distribution within the disc of the galaxy using all five Herschel wavebands and find dust temperatures of similar to 30 K towards the centre of the disc and a smoothly decreasing trend to similar to 20 K with increasing radius. We find a total dust mass of (1.59 +/- 0.05) x 107 M? and a total gas mass of (2.7 +/- 0.2) x 109 M?. The average gas-to-dust mass ratio is 103 +/- 8, but we find an interesting increase in this ratio to approximately 275 towards the centre of Cen A. We discuss several possible physical processes that may be causing this effect, including dust sputtering, jet entrainment and systematic variables such as the XCO factor. Dust sputtering by X-rays originating in the active galactic nucleus or the removal of dust by the jets is our most favoured explanation.},
  author       = {Parkin, TJ and Wilson, CD and Foyle, K and Baes, Maarten and Bendo, GJ and Boselli, A and Boquien, M and Cooray, A and Cormier, D and Davies, JI and Eales, SA and Galametz, M and Gomez, HL and Lebouteiller, V and Madden, S and Mentuch, E and Page, MJ and Pohlen, M and Remy, A and Roussel, H and Sauvage, M and Smith, MWL and Spinoglio, L},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {TELESCOPE NEARBY GALAXIES,COOL INTERSTELLAR-MEDIUM,NEUTRAL HYDROGEN OBSERVATIONS,FAR-INFRARED EMISSION,EARLY-TYPE GALAXIES,submillimetre: ISM,infrared: ISM,galaxies: individual: Centaurus A,galaxies: ISM,NGC 5128 CENTAURUS,MOLECULAR GAS,ELLIPTIC GALAXIES,STAR-FORMATION,COLD DUST},
  language     = {eng},
  number       = {3},
  pages        = {2291--2301},
  title        = {The gas-to-dust mass ratio of Centaurus A as seen by Herschel},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2012.20778.x},
  volume       = {422},
  year         = {2012},
}

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