J/A+A/709/A50 3C 84 jet images (Paraschos+, 2026)
Where within the 3C 84 jet are gamma-rays produced?
Paraschos G.F., Liodakis I., Jorstad S., Kovalev Y.Y., Chakraborty S.,
Marin F., Ehlert S.R., Traianou E., Debbrecht L.C., Agudo I., Barnouin T.,
Casey J.J., Di Gesu L., Kaaret P., Kim D.E., Kislat F., Ratheesh A.,
Saade M.L., Tombesi F., Marscher A., Gomez J.-L., Pushkarev A.B.,
Savolainen T., Myserlis I., Gurwell M., Keating G., Rao R., Kang S.,
Lee S.-S., Kim S., Yeon Cheong W., Jeong H.-W., Song C., Li S., Nam M.-S.,
Alvarez-Ortega D., Casadio C., Chen C.-T., Costa E., Churazov E.,
Ferrazzoli R., Galanti G., Khabibullin I., O'Dell S.L., Pacciani L.,
Roncadelli M., Roberts O.J., Soffitta P., Swartz D.A., Tavecchio F.,
Weisskopf M.C., Zhuravleva I.
<Astron. Astrophys. 709, A50 (2026)>
=2026A&A...709A..50P 2026A&A...709A..50P (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Interferometry ; Polarization
Keywords: galaxies: jets - galaxies: active -
galaxies: individual: 3C 84 (NGC 1275) - techniques: interferometric -
techniques: high angular resolution - techniques: polarimetric
Abstract:
The location of gamma-ray creation and emission within extra-galactic
jets is a matter of active debate. One particularly well-suited source
to pinpoint the location is the nearby, bright radio galaxy 3C 84,
harbouring a powerful jet. Here we investigate the origin of
gamma-rays measured during a recent gamma-ray flare, by analysing the
linear polarisation signal of close-in-time very long baseline
interferometry (VLBI) observations at centimetre and millimetre
wavelengths. While 3C 84 is overall almost unpolarised, we find that
close-in-time to the gamma-ray flare peak regions at parsec-scale
distances from the central engine shows a fractional linear
polarisation increase. Under the physically well-motivated assumption
of a causal relation between this polarisation enhancement and the
gamma-ray flare, and combined with insights from concurrent X-ray
polarisation measurements, the gamma-rays being created in this region
is a physically motivated scenario, in a process consistent with
synchrotron self-Compton.
Description:
Polarised images in fits format, as they appear in the paper.
Objects:
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RA (2000) DE Designation(s)
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03 19 48.15 +41 30 42.1 3C 84 = NGC 1275
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 98 17 List of fits images
fits/* . 17 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 39 A10 "datime" Obs.date Observation date
41- 44 I4 Kibyte size Size of FITS file
46- 79 A34 --- FileName Name of FITS file, in subdirectory fits
81- 98 A18 --- Title Title of the FITS file
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Acknowledgements:
Georgios F. Paraschos, gfpara(at)utu.fi
License: CC-BY-4.0 [see https://spdx.org/licenses/]
(End) Patricia Vannier [CDS] 24-Mar-2026