Radio Variability in Recently-Quenched Galaxies: The Impact of TDE or AGN Driven Outflows
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915542017769472 |
|---|---|
| author | French, K. Decker Nyland, Kristina Patil, Pallavi De, Kishalay Dong, Dillon Earl, Nicholas Mondal, Samaresh Rowlands, Kate Shepherd, Margaret Verrico, Margaret E. |
| author_facet | French, K. Decker Nyland, Kristina Patil, Pallavi De, Kishalay Dong, Dillon Earl, Nicholas Mondal, Samaresh Rowlands, Kate Shepherd, Margaret Verrico, Margaret E. |
| contents | Outflows and jets launched from the nuclei of galaxies emit radio synchrotron emission that can be used to study the impact of accretion energy on the host galaxy. The decades-long baseline now enabled by large radio surveys allows us to identify cases where new outflows or jets have been launched. Here, we present the results of a targeted VLA program observing four post-starburst galaxies that have brightened significantly in radio emission over the past ~20 years. We obtain quasi-simultaneous observations in five bands (1-18 GHz) for each source. We find peaked spectral energy distributions, indicative of self-absorbed synchrotron emission. While all four sources have risen significantly over the past ~20 years in the 1-2 GHz band, two also show clear recent flares in the 2-4 GHz band. These sources are less luminous than typical peaked spectrum radio AGN. It remains unclear whether these sources are low luminosity analogs of the peaked radio AGN from accreted gas, or driven by tidal disruption events with missed optical flares. Regardless of the source of the accreted material, these newly-launched outflows contain sufficient energy to drive the molecular gas outflows observed in post-starburst galaxies and to drive turbulence suppressing star formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_21838 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Radio Variability in Recently-Quenched Galaxies: The Impact of TDE or AGN Driven Outflows French, K. Decker Nyland, Kristina Patil, Pallavi De, Kishalay Dong, Dillon Earl, Nicholas Mondal, Samaresh Rowlands, Kate Shepherd, Margaret Verrico, Margaret E. Astrophysics of Galaxies Outflows and jets launched from the nuclei of galaxies emit radio synchrotron emission that can be used to study the impact of accretion energy on the host galaxy. The decades-long baseline now enabled by large radio surveys allows us to identify cases where new outflows or jets have been launched. Here, we present the results of a targeted VLA program observing four post-starburst galaxies that have brightened significantly in radio emission over the past ~20 years. We obtain quasi-simultaneous observations in five bands (1-18 GHz) for each source. We find peaked spectral energy distributions, indicative of self-absorbed synchrotron emission. While all four sources have risen significantly over the past ~20 years in the 1-2 GHz band, two also show clear recent flares in the 2-4 GHz band. These sources are less luminous than typical peaked spectrum radio AGN. It remains unclear whether these sources are low luminosity analogs of the peaked radio AGN from accreted gas, or driven by tidal disruption events with missed optical flares. Regardless of the source of the accreted material, these newly-launched outflows contain sufficient energy to drive the molecular gas outflows observed in post-starburst galaxies and to drive turbulence suppressing star formation. |
| title | Radio Variability in Recently-Quenched Galaxies: The Impact of TDE or AGN Driven Outflows |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.21838 |