Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z≈3 Radio-loud Quasars

Jaya Maithil; Daniel A. Schwartz; Aneta Siemiginowska; Preeti Kharb; Diana M. Worrall; John F.C. Wardle; Giulia Migliori; Chi C. Cheung; Bradford Snios; Doug B. Gobeille; Herman L. Marshall; Mark Birkinshaw

doi:10.3847/1538-4357/adccc1

Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z≈3 Radio-loud Quasars

Jaya Maithil^*
, Daniel A. Schwartz
, Aneta Siemiginowska
, Preeti Kharb
, Diana M. Worrall
, John F.C. Wardle
, Giulia Migliori
, Chi C. Cheung
, Bradford Snios
, Doug B. Gobeille
, Herman L. Marshall
, Mark Birkinshaw

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

1 Citation (Scopus)

Abstract

This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and confirm extended kiloparsec-scale jets emission in two quasars (J1405+0415, z = 3.215; J1610+1811, z = 3.122) through meticulous analysis of Chandra X-ray data. To deepen our understanding, high-resolution radio follow-up observations were conducted to constrain relativistic parameters, providing valuable insights into the enthalpy flux of these high-redshift active galactic nucleus jets. The investigation specifically aims to test the X-ray emission mechanism in these quasars by exploring the inverse Compton scattering of cosmic microwave background photons by synchrotron-emitting electrons. Our novel method uses a prior to make a Bayesian estimate of the unknown angle of the jet to our line of sight, thus breaking the usual degeneracy of the bulk Lorentz factor and the Doppler beaming factor.

Original language	English
Article number	75
Number of pages	22
Journal	Astrophysical Journal
Volume	986
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/adccc1
Publication status	Published - 10 Jun 2025

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© 2025. The Author(s). Published by the American Astronomical Society.

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Maithil, J., Schwartz, D. A., Siemiginowska, A., Kharb, P., Worrall, D. M., Wardle, J. F. C., Migliori, G., Cheung, C. C., Snios, B., Gobeille, D. B., Marshall, H. L., & Birkinshaw, M. (2025). Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z≈3 Radio-loud Quasars. Astrophysical Journal, 986(1), Article 75. https://doi.org/10.3847/1538-4357/adccc1

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title = "Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z≈3 Radio-loud Quasars",

abstract = "This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and confirm extended kiloparsec-scale jets emission in two quasars (J1405+0415, z = 3.215; J1610+1811, z = 3.122) through meticulous analysis of Chandra X-ray data. To deepen our understanding, high-resolution radio follow-up observations were conducted to constrain relativistic parameters, providing valuable insights into the enthalpy flux of these high-redshift active galactic nucleus jets. The investigation specifically aims to test the X-ray emission mechanism in these quasars by exploring the inverse Compton scattering of cosmic microwave background photons by synchrotron-emitting electrons. Our novel method uses a prior to make a Bayesian estimate of the unknown angle of the jet to our line of sight, thus breaking the usual degeneracy of the bulk Lorentz factor and the Doppler beaming factor.",

author = "Jaya Maithil and Schwartz, \{Daniel A.\} and Aneta Siemiginowska and Preeti Kharb and Worrall, \{Diana M.\} and Wardle, \{John F.C.\} and Giulia Migliori and Cheung, \{Chi C.\} and Bradford Snios and Gobeille, \{Doug B.\} and Marshall, \{Herman L.\} and Mark Birkinshaw",

note = "Publisher Copyright: {\textcopyright} 2025. The Author(s). Published by the American Astronomical Society.",

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month = jun,

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doi = "10.3847/1538-4357/adccc1",

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AU - Maithil, Jaya

AU - Schwartz, Daniel A.

AU - Siemiginowska, Aneta

AU - Kharb, Preeti

AU - Worrall, Diana M.

AU - Wardle, John F.C.

AU - Migliori, Giulia

AU - Cheung, Chi C.

AU - Snios, Bradford

AU - Gobeille, Doug B.

AU - Marshall, Herman L.

AU - Birkinshaw, Mark

PY - 2025/6/10

Y1 - 2025/6/10

N2 - This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and confirm extended kiloparsec-scale jets emission in two quasars (J1405+0415, z = 3.215; J1610+1811, z = 3.122) through meticulous analysis of Chandra X-ray data. To deepen our understanding, high-resolution radio follow-up observations were conducted to constrain relativistic parameters, providing valuable insights into the enthalpy flux of these high-redshift active galactic nucleus jets. The investigation specifically aims to test the X-ray emission mechanism in these quasars by exploring the inverse Compton scattering of cosmic microwave background photons by synchrotron-emitting electrons. Our novel method uses a prior to make a Bayesian estimate of the unknown angle of the jet to our line of sight, thus breaking the usual degeneracy of the bulk Lorentz factor and the Doppler beaming factor.

AB - This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and confirm extended kiloparsec-scale jets emission in two quasars (J1405+0415, z = 3.215; J1610+1811, z = 3.122) through meticulous analysis of Chandra X-ray data. To deepen our understanding, high-resolution radio follow-up observations were conducted to constrain relativistic parameters, providing valuable insights into the enthalpy flux of these high-redshift active galactic nucleus jets. The investigation specifically aims to test the X-ray emission mechanism in these quasars by exploring the inverse Compton scattering of cosmic microwave background photons by synchrotron-emitting electrons. Our novel method uses a prior to make a Bayesian estimate of the unknown angle of the jet to our line of sight, thus breaking the usual degeneracy of the bulk Lorentz factor and the Doppler beaming factor.

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JF - Astrophysical Journal

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ER -

Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z≈3 Radio-loud Quasars

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