期刊
ASTROPHYSICAL JOURNAL
卷 814, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/814/1/43
关键词
circumstellar matter; stars: formation; stars: individual (L1157); stars: pre-main sequence; techniques: interferometric
资金
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1139950] Funding Source: National Science Foundation
- National Research Council of Science & Technology (NST), Republic of Korea [2015183001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A massive envelope and a strong bipolar outflow are the two main structures characterizing the youngest protostellar systems. In order to understand the physical properties of a bipolar outflow and the relationship with those of the envelope, we obtained a mosaic map covering the whole bipolar outflow of the youngest protostellar system L1157 with about 5 '' angular resolution in CO J = 2-1 using the Combined Array for Research in Millimeter-wave Astronomy. By utilizing these observations of the whole bipolar outflow, we estimate its physical properties and show that they are consistent with multiple jets. We also constrain a preferred precession direction. In addition, we observed the central envelope structure with 2 resolution in the lambda = 1.3 and 3 mm continua and various molecular lines: (CO)-O-17, (CO)-O-18, (13)CO3 CS, CN, N2H+, CH3OH, H2O, SO, and SO2. All of the CO isotopes and CS, CN, and N2H+ have been detected and imaged. We marginally detected the features that can be interpreted as a rotating inner envelope in (CO)-O-17 and (CO)-O-18 and as an infalling outer envelope in N2H+. We also estimated the envelope and central protostellar masses and found that the dust-opacity spectral index changes with radius.
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