DOI QR코드

DOI QR Code

HCN AND HCO+ EMISSION IN M31 : TRACING THE DENSE MOLECULAR GAS IN A GALACTIC DISK

  • MULLER SEBASTIEN (Academia Sinica Institute of Astronomy and Astrophysics) ;
  • BROUILLET NATHALIE (Observatoire de Bordeaux, Universite Bordeaux 1- CNRS) ;
  • HERPIN FABRICE (Observatoire de Bordeaux, Universite Bordeaux 1- CNRS) ;
  • BRAINE JONATHAN (Observatoire de Bordeaux, Universite Bordeaux 1- CNRS) ;
  • JACQ THIERRY (Observatoire de Bordeaux, Universite Bordeaux 1- CNRS)
  • Published : 2005.06.01

Abstract

We present mm observations with the IRAM 30m radiotelescope of the HCN (J=1-0) and HCO+ (J=1-0) emission lines from Giant Moleculat Clouds (GMC) in the disk of the Andromeda Galaxy, The selected GMC targets have various morphology and environments, including locations within spiral arms or in interarm regions and with galactocentric radii ranging from 2.4 to 15.5 kpc over the disk. The radial distributions of the ratios HCN/CO and HCO+ /CO are discussed and their values are compared to other galaxies.

Keywords

Galaxies: ISM;Galaxies: M31;ISM: molecules

References

  1. Brouillet N., Muller S., Herpin F., Braine J., & Jacq T., 2005 A&A 429, 153 https://doi.org/10.1051/0004-6361:20034354
  2. Downes D., Radford S. J. E., Guilloteau S., Guelin M., Greve A., & Morris D., 1992 A&A 262, 424
  3. Gao Y. & Solomon P. M., 2004, ApJ 152, 63 https://doi.org/10.1086/383003
  4. Guelin M., Nieten C., Neininger N., Muller S., Lucas R., Ungerechts H., & Wielebinski R., 2000, The interstellar medium in M31 and M33, Proceedings, 232 Eds
  5. Berkhuijsen E., Beck R., & Walterbos R. A. M., Shaker, Aachen, 15
  6. Helfer T. T. & Blitz L., 1997, ApJ, 478, 233 (a) https://doi.org/10.1086/303774
  7. Helfer T. T. & Blitz L., 1997, ApJ, 478,162 (b) https://doi.org/10.1086/303760
  8. Jackson J. M., Heyer M. H., Paglione T. A. D., & Bolatto A. D., 1996 ApJ 456, L91
  9. Kuno N., Nakai N., Handa T., & Sofue Y, 1995 PASJ 47, 745
  10. Liszt H. S., 1995, ApJ, 442, 163 https://doi.org/10.1086/175431
  11. Nguyen-Q-Rieu, Jackson J. M., Henkel C., Truong-Bach, & Mauersberger R., 1992, ApJ, 399, 521 https://doi.org/10.1086/171944
  12. Nieten C., Neininger N., Guelin M., Ungerechts H., Lucas R., Wielebinski R., Beck R., & Berkhuijsen E. M., 2005, submitted to A&A
  13. Paglione T. A. D., Jackson J. M., Bolatto A. D., & Heyer M. H., 1998, ApJ 493, 680 https://doi.org/10.1086/305136
  14. Solomon P. M., Downes D., & Radford S. J. E., 1992, ApJ ,387, L55 https://doi.org/10.1086/186304
  15. Sorai K., Nakai N., Kuno N., & Nishiyama K., 2002, PASJ, 54, 179 https://doi.org/10.1093/pasj/54.2.179