Four Highly Luminous Massive Star Forming Regions in the Norma Spiral Arm II. Deep NIR imaging

Autor:	Chavarria, L., Mardones, D., Garay, G., Escala, A., Bronfman, L., Lizano, S.
Rok vydání:	2009
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
Zdroj:	Astrophys.J.710:583-596,2010
Druh dokumentu:	Working Paper
DOI:	10.1088/0004-637X/710/1/583
Popis:	We present sensitive NIR (J, H and K) imaging observations toward four luminous massive star forming regions in the Norma Spiral Arm: G324.201+0.119, G328.307+0.432, G329.337+0.147 and G330.949-0.174. We identify three clusters of young stellar objects (YSO) based on surface density diagnostics. We also find that sources detected only in the H and K-bands and with colors corresponding to spectral types earlier than B2, are likely YSOs. We analyze the spatial distribution of stars of different masses and find signatures in two clusters of primordial mass segregation which can't be explained as due to incompleteness effects. We show that dynamic interactions of cluster members with the dense gas from the parent core can explain the observed mass segregation, indicating that the gas plays an important role in the dynamics of young clusters. Comment: Submitted to ApJ in September 2009
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0911.4888 Zobrazit plný text záznamu View this record from Arxiv