AKARI/IRC Near-Infrared Spectral Atlas of Galactic Planetary Nebulae

TL;DR

This paper presents a near-infrared spectral atlas of 72 Galactic planetary nebulae, providing detailed emission feature measurements to aid in understanding their properties.

Contribution

It offers a new catalog of low-resolution near-infrared spectra of Galactic PNe obtained with IRC, including emission feature analysis without flux loss.

Findings

Detected hydrogen recombination lines and hydrocarbon features.

Measured emission line intensities and equivalent widths.

Provided a comprehensive spectral catalog for PNe studies.

Abstract

Near-infrared (2.5-5.0$\,\mu$m) low-resolution ($\lambda/\Delta\lambda{\sim}100$) spectra of 72 Galactic planetary nebulae (PNe) were obtained with the Infrared Camera (IRC) in the post-helium phase. The IRC, equipped with a $1'{\times}1'$ window for spectroscopy of a point source, was capable of obtaining near-infrared spectra in a slit-less mode without any flux loss due to a slit. The spectra show emission features including hydrogen recombination lines and the 3.3-3.5$\,\mu$m hydrocarbon features. The intensity and equivalent width of the emission features were measured by spectral fitting. We made a catalog providing unique information on the investigation of the near-infrared emission of PNe. In this paper, details of the observations and characteristics of the catalog are described.