New places and phases of CO-poor/CI-rich molecular gas in the Universe
In this work we extend the work on the recently discovered role of Cosmic Rays (CRs) in regulating the average CO/$\rm H_2$ abundance ratio in molecular clouds (and thus their CO line visibility) in starburst galaxies, and find that it can lead to a CO-poor/CI-rich $\rm H_2 $ gas phase even in envir...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
arXiv
2018
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.1804.09654 https://arxiv.org/abs/1804.09654 |
id |
ftdatacite:10.48550/arxiv.1804.09654 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.1804.09654 2023-05-15T13:37:39+02:00 New places and phases of CO-poor/CI-rich molecular gas in the Universe Papadopoulos, Padelis P. Bisbas, Thomas G. Zhang, Zhiyu 2018 https://dx.doi.org/10.48550/arxiv.1804.09654 https://arxiv.org/abs/1804.09654 unknown arXiv https://dx.doi.org/10.1093/mnras/sty1077 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Astrophysics of Galaxies astro-ph.GA FOS Physical sciences article-journal Article ScholarlyArticle Text 2018 ftdatacite https://doi.org/10.48550/arxiv.1804.09654 https://doi.org/10.1093/mnras/sty1077 2022-04-01T09:51:46Z In this work we extend the work on the recently discovered role of Cosmic Rays (CRs) in regulating the average CO/$\rm H_2$ abundance ratio in molecular clouds (and thus their CO line visibility) in starburst galaxies, and find that it can lead to a CO-poor/CI-rich $\rm H_2 $ gas phase even in environments with Galactic or in only modestly enhanced CR backgrounds expected in ordinary star-forming galaxies. Furthermore, the same CR-driven astro-chemistry raises the possibility of a widespread phase transition of molecular gas towards a CO-poor/CI-rich phase in: a) molecular gas outflows found in star-forming galaxies, b) active galactic nuclei (AGNs), and c) near synchrotron-emitting radio jets and the radio-loud cores of powerful radio galaxies. For main sequence galaxies we find that CRs can render some of their molecular gas mass CO-invisible, compounding the effects of low metallicities. Imaging the two fine structure lines of atomic carbon with resolution high enough to search beyond the CI/CO-bright line regions associated with central starbursts can reveal such a CO-poor/CI-rich molecular gas phase, provided that relative brightness sensitivity levels of $T_b$(CI $1-0$)/$T_b$(CO $J=1-0$)$\sim $0.15 are reached. The capability to search for such gas in the Galaxy is now at hand with the new high-frequency survey telescope HEAT deployed in Antarctica and future ones to be deployed in Dome A. ALMA can search for such gas in star-forming spiral disks, galactic molecular gas outflows and the CR-intense galactic and circumgalactic gas-rich environments of radio-loud objects. : 11 pages, 5 figures, MNRAS accepted Text Antarc* Antarctica DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
spellingShingle |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences Papadopoulos, Padelis P. Bisbas, Thomas G. Zhang, Zhiyu New places and phases of CO-poor/CI-rich molecular gas in the Universe |
topic_facet |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
description |
In this work we extend the work on the recently discovered role of Cosmic Rays (CRs) in regulating the average CO/$\rm H_2$ abundance ratio in molecular clouds (and thus their CO line visibility) in starburst galaxies, and find that it can lead to a CO-poor/CI-rich $\rm H_2 $ gas phase even in environments with Galactic or in only modestly enhanced CR backgrounds expected in ordinary star-forming galaxies. Furthermore, the same CR-driven astro-chemistry raises the possibility of a widespread phase transition of molecular gas towards a CO-poor/CI-rich phase in: a) molecular gas outflows found in star-forming galaxies, b) active galactic nuclei (AGNs), and c) near synchrotron-emitting radio jets and the radio-loud cores of powerful radio galaxies. For main sequence galaxies we find that CRs can render some of their molecular gas mass CO-invisible, compounding the effects of low metallicities. Imaging the two fine structure lines of atomic carbon with resolution high enough to search beyond the CI/CO-bright line regions associated with central starbursts can reveal such a CO-poor/CI-rich molecular gas phase, provided that relative brightness sensitivity levels of $T_b$(CI $1-0$)/$T_b$(CO $J=1-0$)$\sim $0.15 are reached. The capability to search for such gas in the Galaxy is now at hand with the new high-frequency survey telescope HEAT deployed in Antarctica and future ones to be deployed in Dome A. ALMA can search for such gas in star-forming spiral disks, galactic molecular gas outflows and the CR-intense galactic and circumgalactic gas-rich environments of radio-loud objects. : 11 pages, 5 figures, MNRAS accepted |
format |
Text |
author |
Papadopoulos, Padelis P. Bisbas, Thomas G. Zhang, Zhiyu |
author_facet |
Papadopoulos, Padelis P. Bisbas, Thomas G. Zhang, Zhiyu |
author_sort |
Papadopoulos, Padelis P. |
title |
New places and phases of CO-poor/CI-rich molecular gas in the Universe |
title_short |
New places and phases of CO-poor/CI-rich molecular gas in the Universe |
title_full |
New places and phases of CO-poor/CI-rich molecular gas in the Universe |
title_fullStr |
New places and phases of CO-poor/CI-rich molecular gas in the Universe |
title_full_unstemmed |
New places and phases of CO-poor/CI-rich molecular gas in the Universe |
title_sort |
new places and phases of co-poor/ci-rich molecular gas in the universe |
publisher |
arXiv |
publishDate |
2018 |
url |
https://dx.doi.org/10.48550/arxiv.1804.09654 https://arxiv.org/abs/1804.09654 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://dx.doi.org/10.1093/mnras/sty1077 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1804.09654 https://doi.org/10.1093/mnras/sty1077 |
_version_ |
1766095529183281152 |