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arXiv · 2301.06559

The Collisional and Photoionized Plasma in the Polarized NLS1 galaxy Mrk 1239

Margaret Z. Buhariwalla·Luigi C. Gallo·J. Mao·S. Komossa·J. Jiang·A Gonzalez·D. Grupe
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Abstract

Mrk 1239 is a highly polarized NLS1 in the optical band, whose $0.3-3$ keV spectrum has remained remarkably consistent over more than two decades of observation. Previous analysis of this object suggested that the soft X-ray band was dominated by emission lines (collisionally and/or photoionized) from the distant host galaxy as the X-ray emission from the central engine was highly obscured. New XMM-Newton data of Mrk 1239 are presented here to investigate the soft X-ray band of this galaxy with high resolution. The first RGS spectra of this source reveal a plethora of ionized emission lines originating from two distinct plasmas, one collisionally ionized and the other photoionized at approximately equal brightness. The best fit model uses {\sc apec} and {\sc xstar} grids to account for the collisionally ionized and photoionized components, respectively. The fit improves significantly if the photoionized material is allowed to outflow at $\approx 500$ km s$^{-1}$, matching the outflow velocity of the forbidden O{\sc vii} emission line. From constraints on the ionization and density of the photoionized material we can estimate the location of it to be no further than a few pc from the central source, around the outer radius of the torus, which is consistent with the O{\sc vii}$(f)$ emission line. Properties of the collisionally ionized plasma are consistent with star formation rate (SFR) of $\approx 3 M_{\odot} \textrm{yr}^{-1}$, which is comparable with several previous measurements of the SFR in this galaxy.

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Margaret Z. Buhariwalla, Luigi C. Gallo, J. Mao, S. Komossa, J. Jiang, A Gonzalez, D. Grupe. 2023-01-16. The Collisional and Photoionized Plasma in the Polarized NLS1 galaxy Mrk 1239. https://doi.org/10.1093/mnras%2Fstad265

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