Detection of a Noble Gas Molecular Ion, 36ArH+, in the Crab Nebula

被引：146

作者：

Barlow, M. J. ^{[1
]}

Swinyard, B. M. ^{[1
,2
]}

Owen, P. J. ^{[1
]}

Cernicharo, J. ^{[3
]}

Gomez, H. L. ^{[4
]}

Ivison, R. J. ^{[5
]}

Krause, O. ^{[6
]}

Lim, T. L. ^{[2
]}

Matsuura, M. ^{[1
]}

Miller, S. ^{[1
]}

Olofsson, G. ^{[7
]}

Polehampton, E. T. ^{[2
,8
]}

机构：

[1] Univ London Univ Coll, Dept Phys & Astron, London WC1E 6BT, England

[2] Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot OX11 0QX, Oxon, England

[3] CSIC, Inst Nacl Tecn Aeroesp, Lab Mol Astrophys, Dept Astrophys,Ctr Astrobiol, Madrid 28850, Spain

[4] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales

[5] Royal Observ Edinburgh, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland

[6] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[7] Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, S-10691 Stockholm, Sweden

[8] Univ Lethbridge, Dept Phys & Astron, Inst Space Imaging Sci, Lethbridge, AB T1K 3M4, Canada

来源：

SCIENCE | 2013年 / 342卷 / 6164期

关键词：

ROTATIONAL-EXCITATION; HERSCHEL; SPECTROSCOPY; KNOTS; HEH+;

D O I：

10.1126/science.1243582

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Noble gas molecules have not hitherto been detected in space. From spectra obtained with the Herschel Space Observatory, we report the detection of emission in the 617.5- and 1234.6-gigahertz J = 1-0 and 2-1 rotational lines of (ArH+)-Ar-36 at several positions in the Crab Nebula, a supernova remnant known to contain both molecular hydrogen and regions of enhanced ionized argon emission. Argon-36 is believed to have originated from explosive nucleosynthesis in massive stars during core-collapse supernova events. Its detection in the Crab Nebula, the product of such a supernova event, confirms this expectation. The likely excitation mechanism for the observed (ArH+)-Ar-36 emission lines is electron collisions in partially ionized regions with electron densities of a few hundred per centimeter cubed.

引用

页码：1343 / 1345

页数：3

共 32 条

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