Gespeichert in:
| Hauptverfasser: | , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2503.17324 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866909595424784384 |
|---|---|
| author | Watson, Courtney B. Blanton, Elizabeth L. Golden-Marx, Emmet Ashby, Matthew L. N. Randall, Scott W. Wing, J. D. Douglass, E. M. |
| author_facet | Watson, Courtney B. Blanton, Elizabeth L. Golden-Marx, Emmet Ashby, Matthew L. N. Randall, Scott W. Wing, J. D. Douglass, E. M. |
| contents | We present new Hubble Space Telescope/Wide Field Camera 3 G141 grism observations for COBRA1411+3415, originally identified as a high-redshift cluster candidate in the Clusters Occupied by Bent Radio AGN (COBRA) survey using radio, infrared, and optical data. We spectroscopically identify seven cluster members within a 0.5 Mpc radius with grism redshifts in the range $1.8006 \leq z_{grism} \leq 1.8175$, consistent with COBRA1411+3415 being a high-redshift cluster with a mean redshift of $\langle z_{grism}\rangle = 1.8106 \pm 0.0006$. The detection of seven galaxies within this small redshift range is significant above the background distribution of galaxies at the level of 5$σ$. The line-of-sight velocity dispersion of the cluster is found to be $σ_{\parallel} = 701^{+347}_{-138}$ km/s with a virial mass of $M_{200} \approx 2.2^{+3.3}_{-1.3}\times 10^{14}$ M$_{\odot}$. However, the mass may be lower if the cluster is still in formation. In projected phase-space, we also identify two possible infalling members of COBRA1411+3415 and two additional structures at $z\sim 1.73$ and $z\sim 1.88$. The similar spatial distributions and small projected separation from the main cluster suggest they could be a part of the same large-scale filament and together may form a protocluster system that could eventually merge to form a single, massive cluster. COBRA1411+3415 is the highest redshift cluster to be spectroscopically confirmed using a bent, double-lobed radio source as a cluster tracer. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_17324 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HST Grism Observations of a z~1.8 Cluster Candidate from the Clusters Occupied by Bent Radio AGN (COBRA) Survey Watson, Courtney B. Blanton, Elizabeth L. Golden-Marx, Emmet Ashby, Matthew L. N. Randall, Scott W. Wing, J. D. Douglass, E. M. Astrophysics of Galaxies We present new Hubble Space Telescope/Wide Field Camera 3 G141 grism observations for COBRA1411+3415, originally identified as a high-redshift cluster candidate in the Clusters Occupied by Bent Radio AGN (COBRA) survey using radio, infrared, and optical data. We spectroscopically identify seven cluster members within a 0.5 Mpc radius with grism redshifts in the range $1.8006 \leq z_{grism} \leq 1.8175$, consistent with COBRA1411+3415 being a high-redshift cluster with a mean redshift of $\langle z_{grism}\rangle = 1.8106 \pm 0.0006$. The detection of seven galaxies within this small redshift range is significant above the background distribution of galaxies at the level of 5$σ$. The line-of-sight velocity dispersion of the cluster is found to be $σ_{\parallel} = 701^{+347}_{-138}$ km/s with a virial mass of $M_{200} \approx 2.2^{+3.3}_{-1.3}\times 10^{14}$ M$_{\odot}$. However, the mass may be lower if the cluster is still in formation. In projected phase-space, we also identify two possible infalling members of COBRA1411+3415 and two additional structures at $z\sim 1.73$ and $z\sim 1.88$. The similar spatial distributions and small projected separation from the main cluster suggest they could be a part of the same large-scale filament and together may form a protocluster system that could eventually merge to form a single, massive cluster. COBRA1411+3415 is the highest redshift cluster to be spectroscopically confirmed using a bent, double-lobed radio source as a cluster tracer. |
| title | HST Grism Observations of a z~1.8 Cluster Candidate from the Clusters Occupied by Bent Radio AGN (COBRA) Survey |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.17324 |