Herschel Planetary Nebula Survey (HerPlaNS): Hydrogen Recombination Laser Lines in Mz 3

Abstract

The bipolar nebula Menzel 3 (Mz 3) was observed as part of the \textit{Herschel} Planetary Nebula Survey (\textit{HerPlaNS}), which used the PACS and SPIRE instruments aboard the \textit{Herschel Space Observatory} to study a sample of planetary nebulae (PNe). In this paper, one of the series describing \textit{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 to 680 $\mu$m range covered by the PACS and SPIRE instruments (H11$\alpha$ to H21$\alpha$ and H14$\beta$). 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 $\alpha$ 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.

arXiv commentPublished in MNRAS. ESA Portal Story. 13 Pages, 7 figures

References in corpus (38)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Non-linear Least Squares Fitting in IDL with MPFIT
• In-flight calibration of the Herschel-SPIRE instrument
• A Compact X-ray Source and Possible X-ray Jets within the Planetary Nebula Menzel 3
• Planetary nebula or symbiotic Mira? Near infrared colours mark the difference
• A Photoevaporating Rotating Disk in the Cepheus A HW2 Star Cluster
• IPHAS and the symbiotic stars. II. New discoveries and a sample of the most common mimics
• Planetary nebulae abundances and stellar evolution II
• A morpho-kinematic and spectroscopic study of the bipolar nebulae: M 2-9, Mz 3, and Hen 2-104
• VLA H92 Alpha and H53 Alpha Radio Recombination Line Observations of M82
• Spectroscopic survey of emission-line stars. I. B[e] stars
• Hydrogen Masers. I: Theory and Prospects
• Menzel 3: Dissecting the ant
• Herschel-SPIRE FTS spectroscopy of the carbon-rich objects AFGL 2688, AFGL 618 and NGC 7027
• Multi-wavelength diagnostic properties of Galactic Planetary Nebulae detected by GLIMPSE-I
• A disc in the heart of the Ant nebula
• Extremely broad radio recombination maser lines toward the high-velocity ionized jet in Cepheus A HW2
• A silicate disk in the heart of the Ant
• Bispectrum speckle interferometry of the B[e] star MWC 349A
• Rotating and infalling motion around the high-mass young stellar object Cepheus A-HW2 observed with the methanol maser at 6.7 GHz
• The Herschel Planetary Nebula Survey (HerPlaNS) I. Data Overview and Analysis Demonstration with NGC 6781
• The Herschel Planetary Nebula Survey (HerPlaNS) - a comprehensive dusty photoionization model of NGC6781
• A non-LTE radiative transfer model to study ionized outflows and disks. The case of MWC349A
• Discovery of a parsec-scale bipolar nebula around MWC 349A
• Mz 3, a Multipolar Nebula in the Making
• A new radio recombination line maser object toward the MonR2 HII region
• A pilot search for mm-wavelength recombination lines from emerging ionized winds in pre-planetary nebulae candidates
• $\eta$ Carinae Baby Homunculus Uncovered by ALMA
• [Fe III] emission lines in the planetary nebula NGC 2392
• Spectroscopic Analysis in the Virtual Observatory Environment with SPLAT-VO
• Hydrogen Masers. II: MWC349
• Disk evaporation in a planetary nebula
• Origin of the ionized wind in MWC 349A
• Improved Constraints on the Disk Around MWC 349A from the 23-Meter LBTI
• Optically Thick Radio Cores of Narrow-Waist Bipolar Nebulae
• A genetic algorithm approach to fitting interferometric data of post-AGB objects: I. the case of the Ant nebula

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