X-Ray Spectral Variability as a Probe of Multimessenger Emission in Blazar 5BZB J0630−2406

Sanchez Zaballa JM, Buson S, Marchesi S, Tombesi F, Dauser T, Wilms J, Azzollini A (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Astrophysical Journal American Astronomical Society

Book Volume: 988

Article Number: 120

Journal Issue: 1

DOI: 10.3847/1538-4357/addfd2

Abstract

X-ray observations are essential for understanding the multimessenger emission mechanisms of active galactic nuclei (AGN). Blazars, a subset of AGN whose X-ray emission predominantly originates from relativistic jets, have been proposed as promising high-energy neutrino sources. In this work, we study the candidate neutrino-emitting blazar 5BZB J0630-2406, which has been observed over multiple epochs with the XMM-Newton, NuSTAR, Neil Gehrels Swift-XRT, and eROSITA observatories. Analysis of the X-ray spectra in the 2.0-10.0 keV band shows significant variability, with high-flux states adhering to a power-law model indicative of jet emission. However, during low-flux states, the spectrum reveals an additional component in hard X-rays, indicating a transition from jet-dominated to multicomponent X-ray emission, possibly associated with hadronic processes. To investigate this spectral evolution, we tested various models and found it to be consistent with coronal emission or photoionized absorption processes typically observed in obscured AGN. The identification of the X-ray spectral variability in 5BZB J0630-2406, combined with its potential for neutrino production, opens new perspectives in multimessenger astrophysics of blazars, highlighting the synergies between the mechanisms of the jet and the nuclear environment.

Authors with CRIS profile

Thomas Dauser Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Jörn Wilms Professur für Astronomie und Astrophysik

Involved external institutions

Julius-Maximilians-Universität Würzburg DE Germany (DE) University of Bologna / Università di Bologna IT Italy (IT) Università degli Studi di Roma 'Tor Vergata' IT Italy (IT)

How to cite

APA:

Sanchez Zaballa, J.M., Buson, S., Marchesi, S., Tombesi, F., Dauser, T., Wilms, J., & Azzollini, A. (2025). X-Ray Spectral Variability as a Probe of Multimessenger Emission in Blazar 5BZB J0630−2406. Astrophysical Journal, 988(1). https://doi.org/10.3847/1538-4357/addfd2

MLA:

Sanchez Zaballa, Jose Maria, et al. "X-Ray Spectral Variability as a Probe of Multimessenger Emission in Blazar 5BZB J0630−2406." Astrophysical Journal 988.1 (2025).

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