Molecular gas in the Cartwheel Galaxy
We present the first detection of molecular gas in the Cartwheel, the prototype of a collisional ring galaxy formed in the head-on encounter of two galaxies. Until now, only very little atomic gas and no CO had been detected in the centre, where gas is theoretically expected to pile up. Using the Sw...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00046361_v340_n2_pL51_Horellou |
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todo:paper_00046361_v340_n2_pL51_Horellou2023-10-03T13:59:53Z Molecular gas in the Cartwheel Galaxy Horellou, C. Charmandaris, V. Combes, F. Appleton, P.N. Casoli, F. Mirabel, I.F. Galaxies: individual: AM 0035-33 Galaxies: individual: The Cartwheel Galaxies: ISM Radio lines: galaxies We present the first detection of molecular gas in the Cartwheel, the prototype of a collisional ring galaxy formed in the head-on encounter of two galaxies. Until now, only very little atomic gas and no CO had been detected in the centre, where gas is theoretically expected to pile up. Using the Swedish ESO Submm Telescope, we detected both 12CO(1-0) and (2-1) line emission towards the central position. The line ratio and the line widths suggest that the CO(2-1) emission is sub-thermal and that the CO(1-0) emission arises within the central 22″ (13 kpc); it is probably associated with the inner ring and nucleus. We infer a mass of molecular gas (H2) of 1.5 to 6109 M⊙, which is significantly higher than the ∼ 108 M· of atomic gas within that region. The low excitation of the gas, whether it is due to a low temperature or a low density, is consistent with the weak star-forming activity observed in the centre of the Cartwheel. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v340_n2_pL51_Horellou |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Galaxies: individual: AM 0035-33 Galaxies: individual: The Cartwheel Galaxies: ISM Radio lines: galaxies |
| spellingShingle |
Galaxies: individual: AM 0035-33 Galaxies: individual: The Cartwheel Galaxies: ISM Radio lines: galaxies Horellou, C. Charmandaris, V. Combes, F. Appleton, P.N. Casoli, F. Mirabel, I.F. Molecular gas in the Cartwheel Galaxy |
| topic_facet |
Galaxies: individual: AM 0035-33 Galaxies: individual: The Cartwheel Galaxies: ISM Radio lines: galaxies |
| description |
We present the first detection of molecular gas in the Cartwheel, the prototype of a collisional ring galaxy formed in the head-on encounter of two galaxies. Until now, only very little atomic gas and no CO had been detected in the centre, where gas is theoretically expected to pile up. Using the Swedish ESO Submm Telescope, we detected both 12CO(1-0) and (2-1) line emission towards the central position. The line ratio and the line widths suggest that the CO(2-1) emission is sub-thermal and that the CO(1-0) emission arises within the central 22″ (13 kpc); it is probably associated with the inner ring and nucleus. We infer a mass of molecular gas (H2) of 1.5 to 6109 M⊙, which is significantly higher than the ∼ 108 M· of atomic gas within that region. The low excitation of the gas, whether it is due to a low temperature or a low density, is consistent with the weak star-forming activity observed in the centre of the Cartwheel. |
| format |
JOUR |
| author |
Horellou, C. Charmandaris, V. Combes, F. Appleton, P.N. Casoli, F. Mirabel, I.F. |
| author_facet |
Horellou, C. Charmandaris, V. Combes, F. Appleton, P.N. Casoli, F. Mirabel, I.F. |
| author_sort |
Horellou, C. |
| title |
Molecular gas in the Cartwheel Galaxy |
| title_short |
Molecular gas in the Cartwheel Galaxy |
| title_full |
Molecular gas in the Cartwheel Galaxy |
| title_fullStr |
Molecular gas in the Cartwheel Galaxy |
| title_full_unstemmed |
Molecular gas in the Cartwheel Galaxy |
| title_sort |
molecular gas in the cartwheel galaxy |
| url |
http://hdl.handle.net/20.500.12110/paper_00046361_v340_n2_pL51_Horellou |
| work_keys_str_mv |
AT horellouc moleculargasinthecartwheelgalaxy AT charmandarisv moleculargasinthecartwheelgalaxy AT combesf moleculargasinthecartwheelgalaxy AT appletonpn moleculargasinthecartwheelgalaxy AT casolif moleculargasinthecartwheelgalaxy AT mirabelif moleculargasinthecartwheelgalaxy |
| _version_ |
1807316400121839616 |