# Charge exchange in the ultraviolet : implication for interacting clouds in the core of NGC 1275

Gu, Liyi and Mao, Junjie and O'Dea, Christopher P. and Baum, Stefi A. and Mehdipour, Missagh and Kaastra, Jelle S. (2017) Charge exchange in the ultraviolet : implication for interacting clouds in the core of NGC 1275. Astronomy and Astrophysics, 601. A45. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361/201730596)

 Preview Text. Filename: Gu_etal_AAA_2018_Charge_exchange_in_the_ultraviolet_implication.pdf Accepted Author Manuscript Download (418kB)| Preview

## Abstract

Charge exchange emission is known to provide a key diagnostic to the interface between hot and cold matter in many astrophysical environments. Most of the recent charge exchange studies focus on its emission in the X-ray band, but few on the UV part, although the latter can also provide a powerful probe of the charge exchange process. An atomic calculation, as well as an application to observed data, are presented to explore and describe the potential use of the UV data for the study of cosmic charge exchange. Using the newest charge exchange model in the SPEX code v3.03, we re-analyze an archival Hubble STIS data of the central region of NGC 1275. The NGC 1275 spectrum shows hints for three possible weak lines at about 1223.6~{\AA}, 1242.4~{\AA}, and 1244.0~{\AA}, each with a significance of about $2-3\sigma$. The putative features are best explained by charge exchange between highly ionized hydrogen, neon, and sulfur with neutral matter. The wavelengths of the charge exchange lines are found robustly with uncertainties $\leq 0.3$~{\AA}. The possible charge exchange emission shows a line-of-sight velocity offset of about $-3400$ km s$^{-1}$ with respect to the NGC 1275 nucleus, which resembles one of the Ly$\alpha$ absorbers reported in Baum et al. (2005). This indicates that the charge exchange lines might be emitted as the same position of the absorber, which could be ascribed to outflowing gas from the nucleus.

#### ORCID iDs

Gu, Liyi, Mao, Junjie ORCID: https://orcid.org/0000-0001-7557-9713, O'Dea, Christopher P., Baum, Stefi A., Mehdipour, Missagh and Kaastra, Jelle S.;
• Item type: Article 70900 DateEvent31 May 2017Published26 April 2017Published Online3 March 2017Accepted atomic processes, galaxies, X-rays, ultraviolet, Physics, Astronomy and Astrophysics Science > Physics Faculty of Science > Physics Pure Administrator 16 Dec 2019 10:30 24 Jan 2023 02:38 Related item https://strathprints.strath.ac.uk/id/eprint/70900