The excitation mechanisms and evolutionary stages of UWISH2 planetary nebula candidates
The excitation mechanisms and evolutionary stages of UWISH2 planetary nebula candidates
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UWISH2行星状星云候选者的激发机制和演化阶段
DOI:
10.1093/mnras/sty1931
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发表时间:
2018
影响因子:
4.8
通讯作者:
Jones A
中科院分区:
文献类型:
--
作者:
Jones A
We present medium-resolutionK-band long-slit spectroscopy of 29 true, likely, possible, and candidate Galactic Plane planetary nebulae (PNe) from the UWISH2 survey, many of which have only been recently discovered. These objects are bright in molecular hydrogen (H2) emission, and many have bipolar morphologies. Through the detection of the Brγ emission line, which traces ionized hydrogen, we find that the majority of the candidate PNe are indeed likely to be PNe, while 2 of the targets are more likely young stellar objects (YSOs) or pre-planetary nebulae (pPNe). We detect Brγ in 13 objects which have no detection in IPHAS or SHS Hα surveys. This implies that they are potential members of the little-known optically obscured PN population, hidden from wide-field optical surveys. We use the spatial extent of the H21-0 S(1) and Brγ lines to estimate the evolutionary stage of our targets, and find that W-BPNe (bipolar PNe with pinched waist morphologies) are likely to be younger objects, while R-BPNe (bipolar PNe with large ring structures) are more evolved. We use line ratios to trace the excitation mechanism of the H2, and find the 1-0 S(1) / 2-1 S(1) and 1-0 S(1) / Brγ ratios are higher for R-BPNe, implying the H2is thermally excited. However, in W-BPNe, these ratios are lower, and so UV-fluorescence may be contributing to the excitation of H2.
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DOI:
10.1088/0004-637x/799/1/29
发表时间:
2014-11
期刊:
The Astrophysical Journal
影响因子:
--
作者:
T. Ellsworth-Bowers;E. Rosolowsky;J. Glenn;A. Ginsburg;N. Evans II;C. Battersby;Y. Shirley;B. Svoboda
通讯作者:
T. Ellsworth-Bowers;E. Rosolowsky;J. Glenn;A. Ginsburg;N. Evans II;C. Battersby;Y. Shirley;B. Svoboda
DOI:
10.1086/154777
发表时间:
1976
期刊:
The Astrophysical Journal
影响因子:
--
作者:
R. Treffers;U. Fink;H. Larson;T. Gautier
通讯作者:
T. Gautier
DOI:
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发表时间:
2002
期刊:
影响因子:
--
作者:
D. A. García;A. Manchado;P. Garcı́a;C. Dominguez;G. Conway;F. Prada
通讯作者:
F. Prada
DOI:
10.1046/j.1365-8711.2001.04868.x
发表时间:
2001-07
影响因子:
4.8
作者:
S. Lumsden;P. Puxley;M. H. D. O. Physics;Astronomy;U. Leeds;UK.;G. Observatory;Hilo;Hawaii;Usa
通讯作者:
S. Lumsden;P. Puxley;M. H. D. O. Physics;Astronomy;U. Leeds;UK.;G. Observatory;Hilo;Hawaii;Usa
DOI:
10.3847/1538-4357/aac01e
发表时间:
2018-04
期刊:
The Astrophysical Journal
影响因子:
--
作者:
X. Fang;Yong Zhang;S. Kwok;C. Hsia;Wayne Chau;G. Ramos-Larios;M. Guerrero
通讯作者:
X. Fang;Yong Zhang;S. Kwok;C. Hsia;Wayne Chau;G. Ramos-Larios;M. Guerrero