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Large Scale CO Emission in the Orion Nebula

Large Scale CO Emission in the Orion Nebula. HST. CO (2-1). Núria Marcelino (NRAO-CV) Olivier Berné (Leiden Obs , The Netherlands) José Cernicharo (CSIC /INTA , Spain). The closest (brightest) massive star forming region Prototypical source: observed at almost all wavelengths

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Large Scale CO Emission in the Orion Nebula

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  1. Large Scale CO Emission in the Orion Nebula HST CO (2-1) NúriaMarcelino (NRAO-CV) Olivier Berné (Leiden Obs, The Netherlands) José Cernicharo (CSIC/INTA, Spain)

  2. The closest (brightest) massive star forming region Prototypical source: observed at almost all wavelengths Star formation features: hot cores, HII regions, protostars, circumstellar disks, outflows, HH objects, PDRs, etc. 12CO and 13CO: spatial distribution, kinematics, and column densities of molecular gas Previous large scale CO maps have poor spectral and/or angular resolution Motivations Postdoc Symposium, April 11 2011

  3. IRAM 30M radiotelescope(Granada, Spain) Size 1ox0.8o (63 submaps), centeredat IRc2/KL : =05h35m14.5s, =-05o22’29.3’’ HERA 3x3 multibeam receiver 12CO (2-1) @ 230.5 GHz 13CO (2-1) @ 220.4 GHz Angular resolution ~ 11’’ (0.02 pc @ 414 pc) Velocity resolution ~ 0.4 km/s Observations Postdoc Symposium, April 11 2011

  4. 12CO (2-1) Postdoc Symposium, April 11 2011

  5. 13CO (2-1) Postdoc Symposium, April 11 2011

  6. 12CO (2-1) Postdoc Symposium, April 11 2011

  7. 12CO emission @ -5 to 8 km/s Postdoc Symposium, April 11 2011

  8. 12CO emission @ -5 to 8 km/s Postdoc Symposium, April 11 2011

  9. 12CO emission @ -5 to 8 km/s IRAC 3.6 m Postdoc Symposium, April 11 2011

  10. 12CO emission @ -5 to 8 km/s Postdoc Symposium, April 11 2011

  11. 12CO emission @ -5 to 8 km/s IRAC 3.6 m Postdoc Symposium, April 11 2011

  12. Postdoc Symposium, April 11 2011

  13. Orion Waves • Expansion of the HII region • provoked Kelvin-Helmholtz • instabilities and cloud • fragmentation • Intense and ionizing stellar irradiation caused the acceleration of the clumps • First observational evidence of KH instabilities, result of hydrodynamicalfeedback of massive stars on their parental cloud Berné, Marcelino & Cernicharo (Nature, 466, 947) Postdoc Symposium, April 11 2011

  14. 12CO emission @ 8 to 12 km/s Postdoc Symposium, April 11 2011

  15. 12CO emission @ 12 to 25 km/s Postdoc Symposium, April 11 2011

  16. 12CO emission @ 12 to 25 km/s SCUBA 850 m Postdoc Symposium, April 11 2011

  17. Very complex dynamics and velocity structure Clumps, filaments, cavities, pillars/cometary globules, outflows, etc. Interaction between massive star winds, HII regions, and molecular ambient cloud: energy transport, turbulence, formation of filaments, triggered star formation, etc. High angular and spectral resolutions are essential to study in detail these processes Conclusions Postdoc Symposium, April 11 2011

  18. 12CO (2-1) emission Postdoc Symposium, April 11 2011

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