000002149 001__ 2149
000002149 005__ 20160706150028.0
000002149 0247_ $$2DOI$$a10.1051/0004-6361/201322940
000002149 037__ $$aASTROimport-306
000002149 100__ $$aAleman, I.
000002149 245__ $$aHerschel Planetary Nebula Survey (HerPlaNS). First detection of OH+ in planetary nebulae
000002149 260__ $$c2014
000002149 520__ $$aAims: We report the first detections of OH+ emission in planetary nebulae (PNe).  Methods: As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51µm and 672µm to look for new detections.  Results: The rotational emission lines of OH+ at 152.99, 290.20, 308.48, and 329.77µm were detected in the spectra of three planetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27-47 K and 2 × 1010-4 × 1011 cm-2, respectively.  Conclusions: In PNe, the OH+ rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH+ is observed only in PNe with hot central stars (Teff> 100 000 K), suggesting that high-energy photons may play a role in OH+ formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
000002149 700__ $$aUeta, T.
000002149 700__ $$aLadjal, D.
000002149 700__ $$aExter, K. M.
000002149 700__ $$aKastner, J. H.
000002149 700__ $$aMontez, R.
000002149 700__ $$aTielens, A. G. G. M.
000002149 700__ $$aChu, Y.-H.
000002149 700__ $$aIzumiura, H.
000002149 700__ $$aMcDonald, I.
000002149 700__ $$aSahai, R.
000002149 700__ $$aSiódmiak, N.
000002149 700__ $$aSzczerba, R.
000002149 700__ $$avan Hoof, P. A. M.
000002149 700__ $$aVillaver, E.
000002149 700__ $$aVlemmings, W.
000002149 700__ $$aWittkowski, M.
000002149 700__ $$aZijlstra, A. A.
000002149 773__ $$cA79$$pAstronomy and Astrophysics$$v566$$y2014
000002149 85642 $$ahttp://esoads.eso.org/abs/2014A%26A...566A..79A
000002149 905__ $$apublished in
000002149 980__ $$aREFERD