3-D CMZ I: Central Molecular Zone Overview
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912246608691200 |
|---|---|
| author | Battersby, Cara Walker, Daniel L. Barnes, Ashley Ginsburg, Adam Lipman, Dani Alboslani, Danya Hatchfield, H Perry Bally, John Glover, Simon C. O. Henshaw, Jonathan D. Immer, Katharina Klessen, Ralf S. Longmore, Steven N. Mills, Elisabeth A. C. Molinari, Sergio Smith, Rowan Sormani, Mattia C. Tress, Robin G. Zhang, Qizhou |
| author_facet | Battersby, Cara Walker, Daniel L. Barnes, Ashley Ginsburg, Adam Lipman, Dani Alboslani, Danya Hatchfield, H Perry Bally, John Glover, Simon C. O. Henshaw, Jonathan D. Immer, Katharina Klessen, Ralf S. Longmore, Steven N. Mills, Elisabeth A. C. Molinari, Sergio Smith, Rowan Sormani, Mattia C. Tress, Robin G. Zhang, Qizhou |
| contents | The Central Molecular Zone (CMZ) is the largest reservoir of dense molecular gas in the Galaxy and is heavily obscured in the optical and near-IR. We present an overview of the far-IR dust continuum, where the molecular clouds are revealed, provided by Herschel in the inner 40°($|l| <$ 20°) of the Milky Way with a particular focus on the CMZ. We report a total dense gas ($N$(H$_2$) $> 10^{23}$ cm$^{-2}$) CMZ mass of M=$2\substack{+2 \\ -1} \times 10^7$ M$_{\odot}$ and confirm that there is a highly asymmetric distribution of dense gas, with about 70-75% at positive longitudes. We create and publicly release complete fore/background-subtracted column density and dust temperature maps in the inner 40°($|l| <$ 20°) of the Galaxy. We find that the CMZ clearly stands out as a distinct structure, with an average mass per longitude that is at least $3\times$ higher than the rest of the inner Galaxy contiguously from 1.8°$> \ell >$ -1.3°. This CMZ extent is larger than previously assumed, but is consistent with constraints from velocity information. The inner Galaxy's column density peaks towards the SgrB2 complex with a value of about 2 $\times$ 10$^{24}$ cm$^{-2}$, and typical CMZ molecular clouds are about N(H$_2$)=10$^{23}$ cm$^{-2}$. Typical CMZ dust temperatures range from about $12-35$ K with relatively little variation. We identify a ridge of warm dust in the inner CMZ that potentially traces the base of the northern Galactic outflow seen with MEERKAT. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17334 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | 3-D CMZ I: Central Molecular Zone Overview Battersby, Cara Walker, Daniel L. Barnes, Ashley Ginsburg, Adam Lipman, Dani Alboslani, Danya Hatchfield, H Perry Bally, John Glover, Simon C. O. Henshaw, Jonathan D. Immer, Katharina Klessen, Ralf S. Longmore, Steven N. Mills, Elisabeth A. C. Molinari, Sergio Smith, Rowan Sormani, Mattia C. Tress, Robin G. Zhang, Qizhou Astrophysics of Galaxies Solar and Stellar Astrophysics The Central Molecular Zone (CMZ) is the largest reservoir of dense molecular gas in the Galaxy and is heavily obscured in the optical and near-IR. We present an overview of the far-IR dust continuum, where the molecular clouds are revealed, provided by Herschel in the inner 40°($|l| <$ 20°) of the Milky Way with a particular focus on the CMZ. We report a total dense gas ($N$(H$_2$) $> 10^{23}$ cm$^{-2}$) CMZ mass of M=$2\substack{+2 \\ -1} \times 10^7$ M$_{\odot}$ and confirm that there is a highly asymmetric distribution of dense gas, with about 70-75% at positive longitudes. We create and publicly release complete fore/background-subtracted column density and dust temperature maps in the inner 40°($|l| <$ 20°) of the Galaxy. We find that the CMZ clearly stands out as a distinct structure, with an average mass per longitude that is at least $3\times$ higher than the rest of the inner Galaxy contiguously from 1.8°$> \ell >$ -1.3°. This CMZ extent is larger than previously assumed, but is consistent with constraints from velocity information. The inner Galaxy's column density peaks towards the SgrB2 complex with a value of about 2 $\times$ 10$^{24}$ cm$^{-2}$, and typical CMZ molecular clouds are about N(H$_2$)=10$^{23}$ cm$^{-2}$. Typical CMZ dust temperatures range from about $12-35$ K with relatively little variation. We identify a ridge of warm dust in the inner CMZ that potentially traces the base of the northern Galactic outflow seen with MEERKAT. |
| title | 3-D CMZ I: Central Molecular Zone Overview |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.17334 |