J-HERTz: J-PLUS Heritage Exploration of Radio Targets at z $<$ 5
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2025
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| author | Gil, D. Fernández Fernández-Ontiveros, J. A. López-Sanjuan, C. Arizo-Borillo, F. del Pino, A. Hernán-Caballero, A. Lumbreras-Calle, A. Rahna, P. T. Sobral, David Ramió, H. Vázquez Cenarro, A. J. Marín-Franch, A. Angulo, R. E. Ederoclite, A. Cristóbal-Hornillos, D. Dupke, R. A. Hernández-Monteagudo, C. Moles, M. Sodré Jr, L. Varela, J. |
| author_facet | Gil, D. Fernández Fernández-Ontiveros, J. A. López-Sanjuan, C. Arizo-Borillo, F. del Pino, A. Hernán-Caballero, A. Lumbreras-Calle, A. Rahna, P. T. Sobral, David Ramió, H. Vázquez Cenarro, A. J. Marín-Franch, A. Angulo, R. E. Ederoclite, A. Cristóbal-Hornillos, D. Dupke, R. A. Hernández-Monteagudo, C. Moles, M. Sodré Jr, L. Varela, J. |
| contents | We introduce J-HERTz (J-PLUS Heritage Exploration of Radio Targets at $z < 5$), a new multi-wavelength catalog that combines optical narrow-band photometry from J-PLUS, infrared observations from WISE, and deep low-frequency radio data from LoTSS for nearly half a million sources across 2,100 deg$^2$ of the northern sky. Key innovations of J-HERTz include Bayesian neural network classifications for 390,000 galaxies, 31,000 quasars, and 20,000 stars, along with significantly improved photometric redshifts for 235,000 galaxies compared to previous J-PLUS DR3 and LoTSS DR2 estimates. We identify 831 candidate Galactic radio stars, which, if confirmed, would constitute a significant addition to the number of radio-emitting stars identified to date. Among radio-loud galaxies with spectroscopic observations, $\gtrsim$20% lack Seyfert or LINER signatures, indicating a substantial population of optically quiescent radio galaxies, in agreement with previous works. Spectral energy distribution fitting of their host galaxies using J-PLUS photospectra reveals systematically low specific star formation rates, consistent with quenched stellar populations. J-HERTz thus provides a powerful dataset to exploit radio-optical synergies, enabling studies that span from the origin of stellar radio emission to the AGN life cycle and the role of jet activity in shaping host galaxy evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_14844 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | J-HERTz: J-PLUS Heritage Exploration of Radio Targets at z $<$ 5 Gil, D. Fernández Fernández-Ontiveros, J. A. López-Sanjuan, C. Arizo-Borillo, F. del Pino, A. Hernán-Caballero, A. Lumbreras-Calle, A. Rahna, P. T. Sobral, David Ramió, H. Vázquez Cenarro, A. J. Marín-Franch, A. Angulo, R. E. Ederoclite, A. Cristóbal-Hornillos, D. Dupke, R. A. Hernández-Monteagudo, C. Moles, M. Sodré Jr, L. Varela, J. Astrophysics of Galaxies We introduce J-HERTz (J-PLUS Heritage Exploration of Radio Targets at $z < 5$), a new multi-wavelength catalog that combines optical narrow-band photometry from J-PLUS, infrared observations from WISE, and deep low-frequency radio data from LoTSS for nearly half a million sources across 2,100 deg$^2$ of the northern sky. Key innovations of J-HERTz include Bayesian neural network classifications for 390,000 galaxies, 31,000 quasars, and 20,000 stars, along with significantly improved photometric redshifts for 235,000 galaxies compared to previous J-PLUS DR3 and LoTSS DR2 estimates. We identify 831 candidate Galactic radio stars, which, if confirmed, would constitute a significant addition to the number of radio-emitting stars identified to date. Among radio-loud galaxies with spectroscopic observations, $\gtrsim$20% lack Seyfert or LINER signatures, indicating a substantial population of optically quiescent radio galaxies, in agreement with previous works. Spectral energy distribution fitting of their host galaxies using J-PLUS photospectra reveals systematically low specific star formation rates, consistent with quenched stellar populations. J-HERTz thus provides a powerful dataset to exploit radio-optical synergies, enabling studies that span from the origin of stellar radio emission to the AGN life cycle and the role of jet activity in shaping host galaxy evolution. |
| title | J-HERTz: J-PLUS Heritage Exploration of Radio Targets at z $<$ 5 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2511.14844 |