000003972 001__ 3972
000003972 005__ 20190128170208.0
000003972 0247_ $$2DOI$$a10.1093/mnras/sty966
000003972 037__ $$aSCART-2019-0099
000003972 100__ $$aAleman, Isabel
000003972 245__ $$aHerschel Planetary Nebula Survey (HerPlaNS). hydrogen recombination laser lines in Mz 3
000003972 260__ $$c2018
000003972 520__ $$aThe bipolar nebula Menzel 3 (Mz 3) was observed as part of the Herschel Planetary Nebula Survey (HerPlaNS), which used the PACS and SPIRE instruments aboard the Herschel Space Observatory to study a sample of planetary nebulae (PNe). In this paper, one of the series describing HerPlaNS results, we report the detection of H I recombination lines (HRLs) in the spectrum of Mz 3. Inspection of the spectrum reveals the presence of 12 HRLs in the 55-680 µm range covered by the PACS and SPIRE instruments (H11α to H21α and H14β). The presence of HRLs in this range is unusual for PNe and has not been reported in Mz 3 before. Our analysis indicates that the HRLs we observed are enhanced by laser effect occurring in the core of Mz 3. Our arguments for this are (i) the available Mz 3 optical to submillimetre HRL α line intensity ratios are not well reproduced by the spontaneous emission of optically thin ionized gas, as would be typical for nebular gas in PNe; (ii) the compact core of Mz 3 is responsible for a large fraction of the Herschel HRLs emission; (iii) the line intensity ratios for Mz 3 are very similar to those in the core emission of the well known star MWC 349A, where laser effect is responsible for the enhancement of HRLs in the Herschel wavelength range; (iv) the physical characteristics relevant to cause laser effect in the core of MWC 349A are very similar to those in the core of Mz 3.
000003972 594__ $$aNO
000003972 6531_ $$amasers
000003972 6531_ $$abinaries: symbiotic
000003972 6531_ $$acircumstellar matter
000003972 6531_ $$astars: emission-line
000003972 6531_ $$aplanetary nebulae: general
000003972 6531_ $$aplanetary nebulae: individual: Mz 3
000003972 6531_ $$aAstrophysics - Astrophysics of Galaxies
000003972 700__ $$aExter, Katrina
000003972 700__ $$aUeta, Toshiya
000003972 700__ $$aWalton, Samuel
000003972 700__ $$aTielens, A. G. G. M.
000003972 700__ $$aZijlstra, Albert
000003972 700__ $$aMontez, Rodolfo
000003972 700__ $$aAbraham, Zulema
000003972 700__ $$aOtsuka, Masaaki
000003972 700__ $$aBeaklini, Pedro P. B.
000003972 700__ $$avan Hoof, Peter A. M.
000003972 700__ $$aVillaver, Eva
000003972 700__ $$aLeal-Ferreira, Marcelo L.
000003972 700__ $$aMendoza, Edgar
000003972 700__ $$aLépine, Jacques D. R.
000003972 773__ $$c4499-4510$$n4$$pMonthly Notices of the Royal Astronomical Society$$v477$$y2018
000003972 8560_ $$fpeter.vanhoof@observatoire.be
000003972 85642 $$ahttps://ui.adsabs.harvard.edu/\#abs/2018MNRAS.477.4499A
000003972 905__ $$apublished in
000003972 980__ $$aREFERD