# CIELO-RGS: a catalogue of soft X-ray ionized emission lines

## TL;DR

The paper presents CIELO-RGS, a comprehensive catalogue of soft X-ray ionized emission lines from high-resolution spectra, enabling better scientific analysis of astrophysical plasmas across various cosmic sources.

## Contribution

It introduces an automated method for detecting and cataloging emission lines in X-ray spectra, significantly expanding the available data for astrophysical research.

## Key findings

- Catalog contains ~12,000 emission lines from ~1,600 observations.
- Automated line detection algorithm validated against literature.
- Provides detailed line parameters for diverse astrophysical sources.

## Abstract

High-resolution X-ray spectroscopy has advanced our understanding of the hot Universe by revealing physical properties like kinematics, temperature, and abundances of the astrophysical plasmas. Despite the technical and scientific achievements, the lack of scientific products at a level higher than count spectra is hampering full scientific exploitation of high-quality data. This paper introduces the Catalogue of Ionized Emission Lines Observed by the Reflection Grating Spectrometer (CIELO-RGS) onboard the XMM-Newton space observatory. The CIELO-RGS catalogue aims to facilitate the exploitation of emission features in the public RGS spectra archive, in particular, to perform the correlation between X-ray spectral diagnostics parameters with measurements at other wavelengths. This paper focuses on the methodology of catalogue generation, describing the automated line detection algorithm. A moderate sample (~2400 observations) of high-quality RGS spectra available at XMM-Newton Science Archive is used as our starting point. A list of potential emission lines is selected based on a multi-scale peak detection algorithm in a uniform and automated way without prior assumption on the underlying astrophysical model. The candidate line list is validated via spectral fitting with simple continuum and line profile models. We also compare the catalogue content with published literature results on a small number of exemplary sources. We generate a catalogue of emission lines ~12000 detected in ~1600 observations toward stars, X-ray binaries, supernovae remnants, active galactic nuclei, and groups and clusters of galaxies. For each line, we report the observed wavelength, broadening, energy and photon flux, and equivalent width, etc.