Xie, Jin-Jin, Wu, Jing-Wen, Fuller, Gary A., Peretto, Nicolas, Ren, Zhi-Yuan, Chen, Long-Fei, Yan, Yao-Ting, Li, Guo-Dong, Duan, Yan, Xia, Ji-Feng, Wang, Yong-Xiong and Li, Di ORCID: 0000-0003-3010-7661 (2021). Studying infall in infrared dark clouds with multiple HCO+ transitions. Res. Astron. Astrophys., 21 (8). BEIJING: NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES. ISSN 2397-6209

Full text not available from this repository.

Abstract

We investigate the infall properties in a sample of 11 infrared dark clouds (IRDCs) showing blue-asymmetry signatures in HCO+ J=1-0 line profiles. We used JCMT to conduct mapping observations in HCO+ J=4-3 as well as single-point observations in HCO+ J=3-2, towards 23 clumps in these IRDCs. We applied the HILL model to fit these observations and derived infall velocities in the range of 0.5-2.7 km s(-1), with a median value of 1.0 km s(-1), and obtained mass accretion rates of 0.5-14 x 10(-3) M (circle dot)yr(-1). These values are comparable to those found in massive star forming clumps in later evolutionary stages. These IRDC clumps are more likely to form star clusters. HCO+ J=3-2 and HCO+ J=1-0 were shown to trace infall signatures well in these IRDCs with comparable inferred properties. HCO+ J=4-3, on the other hand, exhibits infall signatures only in a few very massive clumps, due to smaller opacities. No obvious correlation for these clumps was found between infall velocity and the NH3/CCS ratio.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Xie, Jin-JinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wu, Jing-WenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fuller, Gary A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peretto, NicolasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ren, Zhi-YuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, Long-FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yan, Yao-TingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, Guo-DongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Duan, YanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Xia, Ji-FengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, Yong-XiongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, DiUNSPECIFIEDorcid.org/0000-0003-3010-7661UNSPECIFIED
URN: urn:nbn:de:hbz:38-597672
DOI: 10.1088/1674-4527/21/8/208
Journal or Publication Title: Res. Astron. Astrophys.
Volume: 21
Number: 8
Date: 2021
Publisher: NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Place of Publication: BEIJING
ISSN: 2397-6209
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MOLECULAR LINE-PROFILES; GRAVITATIONAL INFALL; MASSIVE CORES; COLLAPSE; INFLOW; MOTIONS; REGIONS; CH3CN; III.Multiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/59767

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item