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

I. Aleman ; T. Ueta ; D. Ladjal ; K. M. Exter ; J. H. Kastner ; R. Montez ; Aggm Tielens ; Y. H. Chu ; H. Izumiura ; I. McDonald ; R. Sahai ; N. Siodmiak ; R. Szczerba ; P. A. M. van Hoof ; E. Villaver ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. Wittkowski ; A. A. Zijlstra
Astronomy and Astrophysics (0004-6361). Vol. 566 (2014),
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2014-08-13. Senast ändrad 2015-06-23.
CPL Pubid: 201361


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Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium


Astronomi, astrofysik och kosmologi

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