A Correlation Between Surface Densities of Young Stellar

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Mon R2 grayscale = near-IR extinction IR-excess YSOs = red dots 20+ member groups 10-19 member groups 5 pc N(CII)/N(CI) = 788/185 = 4.3 Age ~ 2 Myr
A Correlation Between Star and Gas Surface Density in MonR2! YSO surface densities: - 11 th nearest neighbor - Each YSO ~ 0.5 Msun Gas surface densities: - Near-IR reddening maps 1 Av ~ 15 Msun / pc 2 Uniform baseline removed Class I YSOs in red Class II YSOs in gray Diagonal shading: - Lower Av limit (Av < 1) on left - Lower YSO surface density limit on bottom (AGN) Power law fit in green Alpha = 2.5 !(YSOs) (Msun / pc 2 ) 2000 200 20 2 0.2 High SF Efficiency (20-30%) in “clusters” 10 100 !(gas) (Msun / pc 2 ) Low SF efficiency (~1%) outside
Page 1 and 2: A Star and Gas Surface Density Corr
Page 3 and 4: A Few Terms Explained... YSO - Youn
Page 5 and 6: Nearby clusters are not spherical,
Page 7: Class I Class II Stars Form in Mole
Page 11 and 12: !(YSOs) (Msun / pc 2 ) A Correlatio
Page 13 and 14: Gas Poor (YSO Rich?): Cep OB3b Clus
Page 15 and 16: Circles: c2d cloud-integrated value
Page 17 and 18: Conclusions Most stars form in clus
Page 19 and 20: -5 -4 -3 -2 -1 Log {!(YSOs) / ! 2 (
Page 21 and 22: YSO Evolutionary State Ratio Maps M
Page 23 and 24: Area distributions of Surface Densi

A Correlation Between Surface Densities of Young Stellar

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