The Herschel Exploitation of Local Galaxy Andromeda ( Helga ) . Ii . Dust and Gas in Andromeda ∗

@inproceedings{Smith2012TheHE,
  title={The Herschel Exploitation of Local Galaxy Andromeda ( Helga ) . Ii . Dust and Gas in Andromeda ∗},
  author={Matthew W. L. Smith and Stephen A. Eales and Haley L. Gomez and Julia Roman-Duval and Jacopo Fritz and Robert L. Braun and Maarten Baes and G. J. Bendo and Joris Blommaert and M. Boquien and Alessandro Boselli and D. L. Clements and Asantha Cooray and Luca Cortese and I. de Looze and G. P. Ford and Walter K. P. Gear and Gianfranco Gentile and K. D. Gordon and Jason M. Kirk and Vianney Lebouteiller and Suzanne C. Madden and E. Mentuch and Brian O’Halloran and Mathew J. Page and Bernhard Schulz and Luigi Spinoglio and Jochem Verstappen and Christine J. Wilson and David Thilker},
  year={2012}
}
We present an analysis of the dust and gas in Andromeda, using Herschel images sampling the entire far-infrared peak. We fit a modified-blackbody model to ∼4000 quasi-independent pixels with spatial resolution of ∼140 pc and find that a variable dust-emissivity index (β) is required to fit the data. We find no significant long-wavelength excess above this model, suggesting there is no cold dust component. We show that the gas-to-dust ratio varies radially, increasing from ∼20 in the center to… CONTINUE READING