Herschel Planetary Nebula Survey (HerPlaNS) First detection of OH+ in planetary nebulae

被引：25

作者：

Aleman, I. ^{[1
]}

Ueta, T. ^{[2
,3
]}

Ladjal, D. ^{[2
]}

Exter, K. M. ^{[4
]}

Kastner, J. H. ^{[5
,6
]}

Montez, R., Jr. ^{[7
]}

Tielens, A. G. G. M. ^{[1
]}

Chu, Y. -H. ^{[8
]}

Izumiura, H. ^{[9
]}

McDonald, I. ^{[10
]}

Sahai, R. ^{[11
]}

Siodmiak, N. ^{[12
]}

Szczerba, R. ^{[12
]}

van Hoof, P. A. M. ^{[13
]}

Villaver, E. ^{[14
]}

Vlemmings, W. ^{[15
]}

Wittkowski, M. ^{[16
]}

Zijlstra, A. A. ^{[10
]}

机构：

[1] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[2] Univ Denver, Dept Phys & Astron, Denver, CO 80210 USA

[3] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[4] Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Leuven, Belgium

[5] Rochester Inst Technol, Chester F Carlson Ctr Imaging Sci, Rochester, NY 14623 USA

[6] Rochester Inst Technol, Lab Multiwavelength Astrophys, Rochester, NY 14623 USA

[7] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[8] Univ Illinois, Dept Astron, Urbana, IL 61801 USA

[9] Natl Astron Observ Japan, Okayama Astrophys Observ, Asakuchi, Okayama 7190232, Japan

[10] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

[11] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[12] N Copernicus Astron Ctr, PL-87100 Torun, Poland

[13] Royal Observ Belgium, B-1180 Brussels, Belgium

[14] Univ Autonoma Madrid, Dept Fis Teor, Fac Ciencias, E-28049 Madrid, Spain

[15] Chalmers, Dept Earth & Space Sci, Onsala Space Observ, S-43992 Onsala, Sweden

[16] ESO, D-85748 Garching, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2014年 / 566卷

基金：

欧洲研究理事会;

关键词：

astrochemistry; circumstellar matter; planetary nebulae: general; planetary nebulae: individual: NGC 6445; planetary nebulae: individual: NGC 6720; planetary nebulae: individual: NGC 6781; INTERSTELLAR OH+; STAR-FORMATION; ORION-KL; MOLECULAR FRACTION; DIPOLE-MOMENT; H-2; EMISSION; HELIX-NEBULA; NGC; 6781; ARP; 220; SUBMILLIMETER;

D O I：

10.1051/0004-6361/201322940

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We report the first detections of OH+ emission in planetary nebulae (PNe). Methods. As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51 mu m and 672 mu m to look for new detections. Results. The rotational emission lines of OH+ at 152.99, 290.20, 308.48, and 329.77 mu m were detected in the spectra of three planetary nebulae: NGC 6445, NGC6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27-47 K and 2 x 10(10)-4 x 10(11) cm(-2), respectively. Conclusions. In PNe, the OH+ rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH+ is observed only in PNe with hot central stars (T-eff > 100 000 K), suggesting that high-energy photons may play a role in OH+ formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies.

引用

页数：9

共 62 条

[1] H2 infrared line emission from the ionized region of planetary nebulae [J].