Deep silence: radio properties of little red dots

• DOI: 10.48550/arxiv.2411.19518
• Publication Date: 2024-11-29
• Authors: K. Perger; Judit Fogasy; S. Frey; K. É. Gabányi
• Keywords: Silence

To investigate the radio properties of recently found high-redshift population, we collected a sample $919$ little red dots (LRDs) from literature. By cross-matching their coordinates with catalogues based on first- and second-epoch observations Very Large Array Sky Survey (VLASS) Faint Images Radio at Twenty-centimeters (FIRST) survey, no counterparts coinciding any LRDs. uncover possible sub-mJy level weak emission, performed mean median image stacking analyses empty-field 'Quick Look' VLASS FIRST cutouts centred LRD positions. We emission above $3\sigma$ noise levels ($\sim11$ $\sim18~\mu$Jy~beam$^{-1}$ for maps, respectively) in either stacked images sample, while single-epoch are comparable to those earlier radio-quiet active galactic nuclei (AGNs). The non-detection LRDs suggests these sources host weaker (or no) AGNs.