Possible environmental quenching in an interacting little red dot pair at $z\sim7$
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_ | 1866912490079649792 |
|---|---|
| author | Mérida, Rosa M. Gaspar, Gaia Sawicki, Marcin Asada, Yoshihisa Desprez, Guillaume Rihtaršič, Gregor Antwi-Danso, Jacqueline Tripodi, Roberta Willott, Chris J. Bradač, Maruša Brammer, Gabriel B. Iyer, Kartheik G. Martis, Nicholas S. Muzzin, Adam Noirot, Gaël Sarrouh, Ghassan T. E. Markov, Vladan |
| author_facet | Mérida, Rosa M. Gaspar, Gaia Sawicki, Marcin Asada, Yoshihisa Desprez, Guillaume Rihtaršič, Gregor Antwi-Danso, Jacqueline Tripodi, Roberta Willott, Chris J. Bradač, Maruša Brammer, Gabriel B. Iyer, Kartheik G. Martis, Nicholas S. Muzzin, Adam Noirot, Gaël Sarrouh, Ghassan T. E. Markov, Vladan |
| contents | We report the discovery of a $z\sim7$ group of galaxies that contains two little red dots (LRDs) just 3.3 kpc apart, along with three potential satellite galaxies, as part of the Canadian NIRISS Unbiased Cluster Survey (CANUCS). The spectral energy distributions (SEDs) of this LRD pair show evidence of a Balmer break, consistent with a recent ($\sim 100$ Myr) quenching of star formation. In contrast, the satellites are compatible with a recent-onset ($\sim 100$ Myr), ongoing burst of star formation. LRD1's SED is consistent with a dust-free active galactic nucleus (AGN) being the source of the UV excess in the galaxy. The optical continuum would be powered by the emission from an obscured post-starburst and the AGN at a subdominant level. LRD2's SED is more ambiguous, but it could also be indicative of a dust-free AGN. In this scenario, these LRDs would be massive ($M_\star\sim10^{10}\,M_\odot$) and dusty (A(V) $>1$ mag) and the three satellites would be lower-mass objects ($M_\star\sim10^{8-9}\,M_\odot$) subject to low dust attenuations. The proximity of the two LRDs suggests that their interaction is responsible for their recent star formation histories, which can be interpreted as environmental bursting and quenching in the epoch of reionization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_17925 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Possible environmental quenching in an interacting little red dot pair at $z\sim7$ Mérida, Rosa M. Gaspar, Gaia Sawicki, Marcin Asada, Yoshihisa Desprez, Guillaume Rihtaršič, Gregor Antwi-Danso, Jacqueline Tripodi, Roberta Willott, Chris J. Bradač, Maruša Brammer, Gabriel B. Iyer, Kartheik G. Martis, Nicholas S. Muzzin, Adam Noirot, Gaël Sarrouh, Ghassan T. E. Markov, Vladan Astrophysics of Galaxies We report the discovery of a $z\sim7$ group of galaxies that contains two little red dots (LRDs) just 3.3 kpc apart, along with three potential satellite galaxies, as part of the Canadian NIRISS Unbiased Cluster Survey (CANUCS). The spectral energy distributions (SEDs) of this LRD pair show evidence of a Balmer break, consistent with a recent ($\sim 100$ Myr) quenching of star formation. In contrast, the satellites are compatible with a recent-onset ($\sim 100$ Myr), ongoing burst of star formation. LRD1's SED is consistent with a dust-free active galactic nucleus (AGN) being the source of the UV excess in the galaxy. The optical continuum would be powered by the emission from an obscured post-starburst and the AGN at a subdominant level. LRD2's SED is more ambiguous, but it could also be indicative of a dust-free AGN. In this scenario, these LRDs would be massive ($M_\star\sim10^{10}\,M_\odot$) and dusty (A(V) $>1$ mag) and the three satellites would be lower-mass objects ($M_\star\sim10^{8-9}\,M_\odot$) subject to low dust attenuations. The proximity of the two LRDs suggests that their interaction is responsible for their recent star formation histories, which can be interpreted as environmental bursting and quenching in the epoch of reionization. |
| title | Possible environmental quenching in an interacting little red dot pair at $z\sim7$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.17925 |