| Name | OT2_mboquien_3 |
| Title | Searching for a missing molecular mass through dust emission in the huge HI collisional ring of NGC 5291. |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342249960&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-oxbqame |
| Author | boquien, m. |
| Description | We propose PACS+SPIRE observations from 70 to 500 micron of the giant (180 kpc across), massive (~5.5 10^10 Msun of HI), strongly star-forming collisional ring around NGC5291, a unique gas-rich object in the nearby Universe. These observations, in combination with available data and models, will allow us to not only study star formation and the dust properties in an unusual and extreme environment, but also to get insight into the nature of Dark Matter. Indeed our team showed that the gravitationally bound objects formed within the ring of NGC5291 contain an unexpected dark component. It is thought that this matter should be baryonic as the material in the collisional ring comes from galactic disks. The most likely candidate is H_2 that is not properly traced by CO. Herschel will allow us to trace this unseen component through dust emission and constrain its nature. The method requires to characterize the dust properties and estimate the dust/gas mass ratio, which are not known in collisional rings and might differ from those in other environments. Indeed, collisional rings are created by high speed collisions. The strong shocks generated by the impact have likely affected the dust properties. Through state-of-the-art modeling of the SED from the UV to the radio, we will constrain the properties of the dust such as their temperature, the distribution of the grain sizes, etc. Addressing the question of dust processing in high-speed collisions is fundamental to derive the molecular gas mass. Finally having an accurate estimate of the total molecular mass, we will be able to address star formation laws, in particular the Schmidt-Kennicutt relation which is suspected not to be universal. This will allow us to determine whether it varies with the environment, having selected an extreme one, such as the collisional ring of NGC5291. The project will require the combination of already available VLA HI observations, star formation tracers and Herschel PACS+SPIRE photometry. |
| Publication |
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| Instrument | PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_large |
| Temporal Coverage | 2012-08-20T17:48:47Z/2013-01-19T22:44:55Z |
| Version | SPG v14.2.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth cornerstone mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-07-19T22:16:40Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, boquien et al., 2013, 'Searching for a missing molecular mass through dust emission in the huge HI collisional ring of NGC 5291.', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-oxbqame |