| Name | OT2_mboyer_1 |
| Title | Investigating the origin of the intercluster medium in M15 |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342246710&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-t2c8krw |
| Author | boyer, m. |
| Description | M15 (NGC 7078) is, quite possibly, the most unusual Galactic globularcluster. It is among the most metal-poor clusters (Fe/H = -2.4),yet has an extremely dusty environment. M15 is home to a dustyplanetary nebula (PN), one of only four in a globular cluster, and isthe only globular cluster with a dusty intercluster medium (ICM). Dustis expected to collect in globular clusters when mass-losing evolvedstars eject material towards the end of their lives, but it is unclearwhy only M15 has been able to retain this ICM. It is possible that thedust originates in the Milky Way, as either swept-up or chancesuperimposed material. We propose to (1) image M15 with PACS and SPIREto determine the ICM (and PN) dust temperature and mass, and (2)obtain PACS line spectroscopy of C II at 158 microns to determinewhether the ICM is of Milky Way origin. These observations allow us toprobe the nature of the ICM material, determine how long it has beencollecting (or how quickly it is being removed), and rule out whetherthe material is instead from the Milky Way. The results will havebroad implications for the presence of ICM in other globular clusters;if the ICM is found to be of Galactic origin, it will significantlyweaken the case for ICM to be present in any globular cluster. |
| Publication |
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| Instrument | PACS_PacsPhoto_largeScan |
| Temporal Coverage | 2012-06-07T06:49:17Z/2012-06-07T12:34:02Z |
| 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 | 2012-12-07T11:08:38Z |
| Last Update | 2025-01-24 |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, boyer et al., 2012, 'Investigating the origin of the intercluster medium in M15', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-t2c8krw |