FALCON (FERMI-ALMA Calibrator ObservatioN): Cross-matching ALMA Calibrators with Fermi-LAT Blazars
Abstract
Blazars are active galactic nuclei with relativistic jets closely aligned with our line of sight, producing Doppler-boosted emission from radio to gamma rays. Millimeter emission near the synchrotron self-absorption turnover probes compact regions at the jet base, yet large statistical studies in this regime remain limited. We construct the FALCON (FERMI--ALMA Calibrator ObservatioN) catalogue, a millimeter-selected blazar sample by cross-matching the ALMA Calibrator Source Catalogue with the Third Data Release of the Fourth LAT AGN Catalog (4LAC-DR3). After removing duplicates, we obtain 949 unique gamma-ray-associated sources, corresponding to approximately 25 % of the 4LAC-DR3 blazar population. For the subset with available redshift measurements, we compute millimeter and gamma-ray luminosities and find a strong, statistically significant correlation that remains robust after accounting for redshift effects. Fermi-detected blazars exhibit systematically flatter millimeter spectral indices than gamma-ray non-detected ALMA calibrators, while the redshift-controlled luminosity correlation becomes progressively weaker from high-synchrotron-peaked BL Lacs toward flat-spectrum radio quasars. These results indicate an intrinsic connection between millimeter and gamma-ray emission, consistent with a common origin in relativistic jets governed by Doppler boosting and time-averaged jet power.
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BibTeX
@misc{narita2026falcon,
title = {{FALCON (FERMI-ALMA Calibrator ObservatioN): Cross-matching ALMA Calibrators with Fermi-LAT Blazars}},
author = {Kanako Narita and Yoshiyuki Inoue and Bunyo Hatsukade and Yasushi Fukazawa},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.07737},
eprint = {2611.07737},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.07737},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - FALCON (FERMI-ALMA Calibrator ObservatioN): Cross-matching ALMA Calibrators with Fermi-LAT Blazars
AU - Kanako Narita
AU - Yoshiyuki Inoue
AU - Bunyo Hatsukade
AU - Yasushi Fukazawa
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.07737
UR - https://arxiv.org/abs/2611.07737
AB - Blazars are active galactic nuclei with relativistic jets closely aligned with our line of sight, producing Doppler-boosted emission from radio to gamma rays. Millimeter emission near the synchrotron self-absorption turnover probes compact regions at the jet base, yet large statistical studies in this regime remain limited. We construct the FALCON (FERMI--ALMA Calibrator ObservatioN) catalogue, a millimeter-selected blazar sample by cross-matching the ALMA Calibrator Source Catalogue with the Third Data Release of the Fourth LAT AGN Catalog (4LAC-DR3). After removing duplicates, we obtain 949 unique gamma-ray-associated sources, corresponding to approximately 25 % of the 4LAC-DR3 blazar population. For the subset with available redshift measurements, we compute millimeter and gamma-ray luminosities and find a strong, statistically significant correlation that remains robust after accounting for redshift effects. Fermi-detected blazars exhibit systematically flatter millimeter spectral indices than gamma-ray non-detected ALMA calibrators, while the redshift-controlled luminosity correlation becomes progressively weaker from high-synchrotron-peaked BL Lacs toward flat-spectrum radio quasars. These results indicate an intrinsic connection between millimeter and gamma-ray emission, consistent with a common origin in relativistic jets governed by Doppler boosting and time-averaged jet power.
ER -