Herschel studies of infrared dark clouds\ud and cores in the Hi-GAL Survey

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Wilcock, Lucy Ann;
  • Subject: QB

ABSTRACT\ud High mass stars affect their environments on a large scale. However, the processes\ud behind the formation of high mass stars are still relatively poorly understood\ud compared to their low mass counterparts. Infrared dark clouds (IRDCs) and their\ud cold co... View more
  • References (132)
    132 references, page 1 of 14

    3.4 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 3.4.1 Masses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 3.4.2 Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . 110 3.4.3 The Interstellar Radiation Field . . . . . . . . . . . . . . . . 112 3.4.4 Internal Heating Sources . . . . . . . . . . . . . . . . . . . . 114

    3.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 6.3.5 Central Density . . . . . . . . . . . . . . . . . . . . . . . . . 276 6.3.6 The Interstellar Radiation Field . . . . . . . . . . . . . . . . 282 6.3.7 Asymmetry Factor . . . . . . . . . . . . . . . . . . . . . . . 284 6.3.8 Mean Core Properties . . . . . . . . . . . . . . . . . . . . . 285

    6.4 Principal Component Analysis . . . . . . . . . . . . . . . . . . . . . 285 6.4.1 Principal Component Analysis Assuming a Linear Relationship285 6.4.2 Principal Component Analysis Assuming a Logarithmic Relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

    7 Summary and Future Work 299 7.1 Thesis summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299 7.2 Numbers and Lifetimes of IRDCs and their Cores . . . . . . . . . . 300 7.3 The Physical Properties of Cores . . . . . . . . . . . . . . . . . . . 302 7.4 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

    1.10 Left: A 6 cm continuum image of G075.78+0.34 (Wood & Churchwell, 1989). Right: A 7 mm continuum image of the same area (Carral et al., 1997). . . . . . . . . . . . . . . . . . . . . . . . . . . 23

    1.11 The H92 radio recombination line ( 0 = 8309:38 MHz) from G028.20- 0.04N, a HCHII region (Sewilo et al., 2004). . . . . . . . . . . . . . 25

    1.12 Diagrams showing two cases for the photoevaporating disk model (Hollenbach et al., 1994). . . . . . . . . . . . . . . . . . . . . . . . . 28

    1.13 UCHII regions with various morphologies (Campbell, 1984; Wood & Churchwell, 1989; Churchwell, 2002) . . . . . . . . . . . . . . . . 31

    1.14 Diagram illustrating the creation of a cometary UCHII via a champagne ow (Churchwell, 1999). . . . . . . . . . . . . . . . . . . . . . 33

    1.15 Diagram illustrating the theory of mass loaded stellar winds (Churchwell, 1999). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

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