Hot, Photoionized X-Ray Gas in Two Luminous Type 2 Quasars: Chandra-HST Evidence for a Wind-driven Sequence

Résumé fourni par la source

Abstract We present new Chandra/ACIS-S imaging spectroscopy of two luminous type 2 quasars (QSO2s), FIRST J120041.4+314745 ( z = 0.116) and 2MASX J13003807+5454367 ( z = 0.088), and compare their X-ray emission with Hubble Space Telescope [O III ] λ 5007 morphologies and kinematics. Both systems show kiloparsec-scale soft X-ray emission. In FIRST J120041, the X-ray morphology is clumpy and closely follows the [O III ] structures, with surface-brightness peaks cospatial with the highest [O III ] velocities (600–750 km s −1 ) and broadest line widths (∼1700 km s −1 ). In 2MASX J130038, the X-ray emission is centrally concentrated and weakly correlated with rotational [O III ] kinematics. Spectral modeling indicates that photoionization dominates the soft X-rays in both quasars. The inferred hot-gas reservoirs are substantial, M Xray ∼ 4.5 × 10 8 M ⊙ (FIRST J120041) and M Xray ∼ 1.8 × 10 8 M ⊙ (2MASX J130038), exceeding the outflowing [O III ] masses by factors of ∼4 and ∼16. In 2MASX J130038, we identify a tentative blueshifted Fe XXVI Ly α line at E rest = 7.14 ± 0.06 keV ( v ∼ 7600 km s −1 ), consistent with a hot wind confined to the inner few hundred parsecs. Combining these results with a broader sample of 12 QSO2s, we argue that luminous quasars evolve along a continuous feedback sequence regulated by progressive clearing of circumnuclear gas. As active galactic nucleus radiation and winds pierce the surrounding medium, systems transition from heavily enshrouded, compact configurations to phases where the X-ray and [O III ] components strongly couple and, eventually, to energetically dominant outflows. FIRST J120041 and 2MASX J130038 represent two points along this sequence, tracing the emergence and growth of hot winds as primary drivers of quasar-scale feedback.

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