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; M. Wittkowski; A. Zijlstra

doi:10.1051/0004-6361/201322940

Herschel Planetary Nebula Survey (HerPlaNS) First detection of OH+ in planetary nebulae
Journal article, 2014

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.

Author

I. Aleman

Leiden University

T. Ueta

JAXA Institute of Space and Astronautical Science

University of Denver

D. Ladjal

University of Denver

K. M. Exter

KU Leuven

J. H. Kastner

Rochester Institute of Technology

R. Montez

Vanderbilt University

Aggm Tielens

Leiden University

Y. H. Chu

University of Illinois

H. Izumiura

National Astronomical Observatory of Japan

I. McDonald

University of Manchester

R. Sahai

Jet Propulsion Laboratory, California Institute of Technology

N. Siodmiak

Polish Academy of Sciences

R. Szczerba

Polish Academy of Sciences

P. A. M. van Hoof

Royal Observatory of Belgium

E. Villaver

Universidad Autonoma de Madrid (UAM)

Wouter Vlemmings

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Other publications Research

M. Wittkowski

European Southern Observatory (ESO)

A. Zijlstra

University of Manchester

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 566 A79

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/201322940

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9/10/2019

Herschel Planetary Nebula Survey (HerPlaNS) First detection of OH+ in planetary nebulae Journal article, 2014