The gas motions around the protostar NGC 1333 IRAS4A2
| Autor: | Hung-Jin Huang, 黃虹瑾 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 IRAS 4A2 is a nearby, Class 0 low-mass protostellar system residing in the NGC 1333 molecular cloud in Perseus cluster. With detections of inverse P-Cygni profile, this target has been identified as a good infall candidate in several studies. Motions of outflow and rotation have also been observed. We decompose these different gas motions in aids of high resolution SMA observation and through radiative transfer modeling. Combining Compact-North, Extended and Very Extended configuration data from SMA, an inverse P-Cygni line profile together with a wide and strong absorption dip over a broad range of area is seen toward 4A2 in 13CO J=2-1. From our radiative transfer modeling, an infalling envelope with a compact disk structure inside, together with a foreground cold layer at around 8 km/s can be used to interpret the observed spectrum and PV diagram of 4A2. We derive a high mass infall rate of an order of 10^-4 M⊙/yr in the envelope. The unresolved disk component is roughly constrained to be 20 AU in radius and 0.02 M⊙ in mass. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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