NASA Goddard Space Flight CenterAnna Trindade FalcãoMultiwavelength AGN astrophysicist

Multiphase AGN OutflowsHot X-Ray WindsPublication overview

The Astrophysical Journal · 2026

Hot X-Ray Gas in Two Luminous Type 2 Quasars

Chandra-HST evidence for a proposed wind-driven sequence

Anna Trindade Falcão, S. B. Kraemer, L. Feuillet, R. Middei, T. J. Turner, J. Reeves, V. Braito, et al.

Read the paper NASA ADS

ApJ 1000, 242 (2026)

Observational composites of 2MASX J13003807+5454367 and FIRST J120041.4+314745, with Chandra X-ray emission in red, Hubble [O III] emission in green, and Hubble stellar continuum in blue.
Observational composites of 2MASX J13003807+5454367 and FIRST J120041.4+314745, with Chandra X-ray emission in red, Hubble [O III] emission in green, and Hubble stellar continuum in blue. X-ray: NASA/CXC; optical: NASA/ESA/HST; image processing and composition: Anna Trindade Falcão.

Scientific summary

Two quasars, two wind-gas relationships

New Chandra/ACIS-S imaging spectroscopy of FIRST J120041.4+314745 and 2MASX J13003807+5454367 is compared with archival Hubble [O III] imaging and STIS kinematics. Both quasars contain kiloparsec-scale soft X-ray emission dominated by photoionized gas. In FIRST J120041, X-ray surface-brightness enhancements are co-spatial with locations where [O III] reaches its highest measured centroid velocities and line widths; in 2MASX J130038, the X-rays are more centrally concentrated and show no clear spatial correlation with the largely rotational [O III] kinematics. Considered with ten additional type 2 quasars, these contrasts motivate a proposed wind-driven feedback sequence. The study does not measure a velocity field for the extended X-ray-emitting gas or observe temporal evolution directly.

Key results

Measurements and physical implications

01

Spectral modeling indicates that photoionization dominates the kiloparsec-scale soft X-ray emission in both quasars.

02

In FIRST J120041, clumpy soft X-ray emission follows the [O III] bicone, and X-ray brightness enhancements coincide spatially with positions where [O III] reaches centroid velocities of approximately 600-750 km s⁻¹ and line widths up to approximately 1700 km s⁻¹. These kinematic measurements apply to [O III], not to the X-ray-emitting gas.

03

Within 1″ apertures—approximately 2 kpc for FIRST J120041 and 1.6 kpc for 2MASX J130038—photoionization modeling gives X-ray-emitting gas masses of approximately 4.1 × 10⁸ M⊙ and 1.8 × 10⁸ M⊙, respectively. After volume normalization, these exceed the outflowing [O III] masses by factors of approximately 4 and 16.

04

The 2MASX J130038 spectrum contains a tentative feature at 7.14 ± 0.06 keV. Its ΔCstat = 10 improvement for two additional parameters corresponds to approximately 2.7σ, but is not a formal line-detection significance. If identified as blueshifted Fe XXVI Lyα, it would imply highly ionized nuclear gas moving at approximately 7600 km s⁻¹; the line identification and nascent-wind interpretation require confirmation.

05
Interpretive conclusion

Together with ten additional luminous type 2 quasars, the two systems motivate a proposed sequence of circumnuclear clearing and feedback. The four stages are an interpretive framework, not an observed temporal progression.

Connected research series

From ionized-outflow energetics to multiphase feedback

Three studies build a common observational picture of how ionized gas, hot X-ray winds, and circumnuclear clearing may be connected across luminous quasars.

  1. 2021Warm-ionized outflow energetics

    Physical Properties of Ionized Outflows in Nearby Type 2 Quasars

    Resolved [O III] gas masses, outflow rates, and energetics for the 12 type 2 quasars.

    Explore this study
  2. 2024Type 1 ionized-gas distributions

    Hubble Observations of Nearby Type 1 Quasars

    More extended but less massive [O III] regions motivate a later, more cleared phase.

    Explore this study
  3. 2026Hot and warm ionized feedback

    Hot, Photoionized X-Ray Gas in Two Luminous Type 2 Quasars

    Chandra and Hubble observations connect hot-wind coupling to a proposed clearing sequence.

    Current study

Proposed physical context

01Confined and diverse
type 2 quasar states
02Increasing wind-gas coupling
in type 2 quasars
03A more cleared,
unobscured type 1 quasar context

Interpretive framework. This sequence connects measurements across different quasars; it does not trace individual systems evolving with time.

Figures from the study

Four-panel decomposition of 2MASX J130038.
2MASX J130038 feedback composite2MASX J13003807+5454367, from left: Chandra X-ray emission, Hubble [O III] emission, Hubble stellar continuum, and the combined observational composite. The scale bar represents 2 kpc.X-ray: NASA/CXC; optical: NASA/ESA/HST; image processing and composition: Anna Trindade Falcão.
Four-panel decomposition of FIRST J120041.
FIRST J120041 feedback compositeFIRST J120041.4+314745, from left: Chandra X-ray emission, Hubble [O III] emission, Hubble stellar continuum, and the combined observational composite. The scale bar represents 2 kpc.X-ray: NASA/CXC; optical: NASA/ESA/HST; image processing and composition: Anna Trindade Falcão.
Four-stage evolutionary sequence for quasar feedback.
Wind-driven feedback sequenceFour proposed quasar-feedback contexts, from a compact obscured configuration to increasingly extended outflow structures. The panels are an interpretive framework, not observations of either quasar evolving with time.Scientific concept and illustration: Anna Trindade Falcão.

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