EPoS Contribution
EPoS Contribution
Stellar feedback effect on star formation in the Carina Nebula

David Rebolledo
JAO-NRAO, Santiago, CL
I will present ALMA high spatial resolution observations towards two star forming regions located in one of the most extreme zones of star formation in the Galaxy, the Carina Nebula. One region (Northern Cloud) is located at the center of the nebula and is severally affected by the stellar feedback from high-mass stars, while the other region (Southern Pillars) is located further south and is less disturbed by the massive star clusters. We found that the region at the center of the nebula is forming less but more massive cores than the region located in the south, suggesting that the level of stellar feedback effectively influence the fragmentation process in clumps. Lines such as HCN, HCO+ and SiO show abundant and complex gas distributions in both regions, confirming the presence of ionization and shock fronts. Jeans analysis suggests that the observed core masses in the region less affected by the massive stars are consistent with thermal fragmentation, but turbulent Jeans fragmentation might explain the high masses of the cores identified in the region in the center of Carina. Consistently, two different analyses in the HCO+ line provided evidence for a higher level of turbulence in the gas more affected by the stellar feedback. The gas column density probability functions, N-PDFs, show log-normal shapes with clear transitions to power law regimes. We observed a wider N-PDF in the region at the center of the nebula, which provides further evidence for a higher level of turbulence in the material with a higher level of massive stellar feedback. Paper reporting this is expected to be accepted in the ApJ in the next weeks. The paper in the registration form is a previous study performed on the HI map of the Carina Nebula Complex.
Caption: Black and white map shows the 1.7 GHz continuum image obtained with the Australia Telescope Compact Array of the Carina Nebula Complex. The center of the image has been displayed with a color range modified by a factor of 10 to better show the strong emission in the center of the nebula. The zoomed regions show the two clumps observed with high resolution with ALMA located in the Northern Cloud and in the Southern Pillars. Both regions are affected by the stellar feedback very differently.
Collaborators:
A. E. Guzman, NAOJ, JP
P. Sanhueza, NAOJ, JP
V. Guzman, UCatolica, CL
A. Green, USyd, AU
M. Burton, Armagh, GB
G. Garay, UChile, CL
S.N. Medina, MPIR, DE
Key publication

Suggested Session: Turbulence