MAGAZ3NE: Evidence for Galactic Conformity in $z\gtrsim3$ Protoclusters
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866909399687102464 |
|---|---|
| author | McConachie, Ian Wilson, Gillian Forrest, Ben Marsan, Z. Cemile Muzzin, Adam Cooper, M. C. Annunziatella, Marianna Marchesini, Danilo Gomez, Percy Chang, Wenjun Stawinski, Stephanie M. Urbano McDonald, Michael Webb, Tracy Noble, Allison Lemaux, Brian C. Shah, Ekta A. Staab, Priti Lubin, Lori M. Gal, Roy R. |
| author_facet | McConachie, Ian Wilson, Gillian Forrest, Ben Marsan, Z. Cemile Muzzin, Adam Cooper, M. C. Annunziatella, Marianna Marchesini, Danilo Gomez, Percy Chang, Wenjun Stawinski, Stephanie M. Urbano McDonald, Michael Webb, Tracy Noble, Allison Lemaux, Brian C. Shah, Ekta A. Staab, Priti Lubin, Lori M. Gal, Roy R. |
| contents | We examine the quiescent fractions of massive galaxies in six $z\gtrsim3$ spectroscopically-confirmed protoclusters in the COSMOS field, one of which is newly confirmed and presented here. We report the spectroscopic confirmation of MAGAZ3NE~J100143+023021 at $z=3.122^{+0.007}_{-0.004}$ by the Massive Ancient Galaxies At $z>3$ NEar-infrared (MAGAZ3NE) survey. MAGAZ3NE~J100143+023021 contains a total of 79 protocluster members (28 spectroscopic and 51 photometric). Three spectroscopically-confirmed members are star-forming ultra-massive galaxies ($\log(M_{\star}/{\rm M}_\odot)>11$; UMGs), the most massive of which has $\log(M_{\star}/{\rm M}_\odot)=11.15^{+0.05}_{-0.06}$. Combining Keck/MOSFIRE spectroscopy and the COSMOS2020 photometric catalog, we use a weighted Gaussian kernel density estimator to map the protocluster and measure its total mass $2.25^{+1.55}_{-0.65}\times10^{14}~{\rm M}_{\odot}$ in the dense ``core'' region. For each of the six COSMOS protoclusters, we compare the quiescent fraction to the status of the central UMG as star-forming or quiescent. We observe that galaxies in these protoclusters appear to obey galactic conformity: elevated quiescent fractions are found in protoclusters with $UVJ$ quiescent UMGs and low quiescent fractions are found in protoclusters containing $UVJ$ star-forming UMGs. This correlation of star-formation/quiescence in UMGs and the massive galaxies nearby in these protoclusters is the first evidence for the existence of galactic conformity at $z>3$. Despite disagreements over mechanisms behind conformity at low redshifts, its presence at these early cosmic times would provide strong constraints on the physics proposed to drive galactic conformity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_14641 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | MAGAZ3NE: Evidence for Galactic Conformity in $z\gtrsim3$ Protoclusters McConachie, Ian Wilson, Gillian Forrest, Ben Marsan, Z. Cemile Muzzin, Adam Cooper, M. C. Annunziatella, Marianna Marchesini, Danilo Gomez, Percy Chang, Wenjun Stawinski, Stephanie M. Urbano McDonald, Michael Webb, Tracy Noble, Allison Lemaux, Brian C. Shah, Ekta A. Staab, Priti Lubin, Lori M. Gal, Roy R. Astrophysics of Galaxies We examine the quiescent fractions of massive galaxies in six $z\gtrsim3$ spectroscopically-confirmed protoclusters in the COSMOS field, one of which is newly confirmed and presented here. We report the spectroscopic confirmation of MAGAZ3NE~J100143+023021 at $z=3.122^{+0.007}_{-0.004}$ by the Massive Ancient Galaxies At $z>3$ NEar-infrared (MAGAZ3NE) survey. MAGAZ3NE~J100143+023021 contains a total of 79 protocluster members (28 spectroscopic and 51 photometric). Three spectroscopically-confirmed members are star-forming ultra-massive galaxies ($\log(M_{\star}/{\rm M}_\odot)>11$; UMGs), the most massive of which has $\log(M_{\star}/{\rm M}_\odot)=11.15^{+0.05}_{-0.06}$. Combining Keck/MOSFIRE spectroscopy and the COSMOS2020 photometric catalog, we use a weighted Gaussian kernel density estimator to map the protocluster and measure its total mass $2.25^{+1.55}_{-0.65}\times10^{14}~{\rm M}_{\odot}$ in the dense ``core'' region. For each of the six COSMOS protoclusters, we compare the quiescent fraction to the status of the central UMG as star-forming or quiescent. We observe that galaxies in these protoclusters appear to obey galactic conformity: elevated quiescent fractions are found in protoclusters with $UVJ$ quiescent UMGs and low quiescent fractions are found in protoclusters containing $UVJ$ star-forming UMGs. This correlation of star-formation/quiescence in UMGs and the massive galaxies nearby in these protoclusters is the first evidence for the existence of galactic conformity at $z>3$. Despite disagreements over mechanisms behind conformity at low redshifts, its presence at these early cosmic times would provide strong constraints on the physics proposed to drive galactic conformity. |
| title | MAGAZ3NE: Evidence for Galactic Conformity in $z\gtrsim3$ Protoclusters |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.14641 |