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

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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)

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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 logoORCID: https://orcid.org/0000-0001-7557-9713, O'Dea, Christopher P., Baum, Stefi A., Mehdipour, Missagh and Kaastra, Jelle S.;
  • Item type:Article
    ID code:70900
    Dates:
    Date
    Event
    31 May 2017
    Published
    26 April 2017
    Published Online
    3 March 2017
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:16 Dec 2019 10:30
    Last modified:11 Nov 2024 12:32
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/70900
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