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Chandra/HETG Doppler velocity measurements in stellar coronal sources
E. Bozzo, D. P. Huenemoerder, M. Falanga +4
Stellar coronal sources have been observed in the past not only for their astrophysical interest in the field of binary system evolution and interaction, but also for their invalua…
Time-dependent photoionization spectroscopy of the Seyfert galaxy NGC 3783
Liyi Gu, Jelle Kaastra, Daniele Rogantini +4
We present an investigation into the spectroscopic properties of non-equilibrium photoionization processes operating in a time-evolving mode. Through a quantitative comparison betw…
Dimming of Continuum Captured in Mrk 841: New Clues on the Nature of the Soft X-ray Excess
Missagh Mehdipour, Gerard Kriss, Jelle Kaastra +2
We report on a remarkable change in the spectral energy distribution (SED) of Mrk 841, providing new insights on how the soft X-ray excess emission in active galactic nuclei (AGNs)…
A detailed analysis of X-ray emission line velocities of Capella from over 20 years of Chandra/HETG spectroscopy
E. Bozzo, D. P. Huenemoerder, N. Produit +3
Capella is the brightest chromospherically active binary in the sky, hosting a cooler G8III giant (Aa) and an hotter G1III companion (Ab). The source has been extensively observed…
Active galactic nuclei with high-resolution X-ray spectroscopy
Luigi C. Gallo, Jon M. Miller, Elisa Costantini
The imminent launch of XRISM will usher in an era of high-resolution X-ray spectroscopy. For active galactic nuclei (AGN) this is an exciting epoch that is full of massive potentia…
Supermassive Black Hole Winds in X-rays: SUBWAYS. II. HST UV spectroscopy of winds at intermediate redshifts
M. Mehdipour, G. A. Kriss, M. Brusa +35
We present a UV spectroscopic study of ionized outflows in 21 active galactic nuclei (AGN), observed with the HST. The targets of the SUBWAYS sample were selected with the aim to p…