A dataset provided by the European Space Agency

Name OT2_mboyer_1
Title Investigating the origin of the intercluster medium in M15


DOI 10.5270/esa-t2c8krw
Author boyer, m.
Description M15 (NGC 7078) is, quite possibly, the most unusual Galactic globular cluster. It is among the most metal-poor clusters ([Fe-H] = -2.4), yet has an extremely dusty environment. M15 is home to a dusty planetary nebula (PN), one of only four in a globular cluster, and is the only globular cluster with a dusty intercluster medium (ICM). Dust is expected to collect in globular clusters when mass-losing evolved stars eject material towards the end of their lives, but it is unclear why only M15 has been able to retain this ICM. It is possible that the dust originates in the Milky Way, as either swept-up or chance superimposed material. We propose to (1) image M15 with PACS and SPIRE to determine the ICM (and PN) dust temperature and mass, and (2) obtain PACS line spectroscopy of [C II] at 158 microns to determine whether the ICM is of Milky Way origin. These observations allow us to probe the nature of the ICM material, determine how long it has been collecting (or how quickly it is being removed), and rule out whether the material is instead from the Milky Way. The results will have broad implications for the presence of ICM in other globular clusters; if the ICM is found to be of Galactic origin, it will significantly weaken the case for ICM to be present in any globular cluster.
Publication Chemical Abundances and Dust in the Halo Planetary Nebula K648 in M15: Its Origin and Evolution Based on an Analysis of Multiwavelength Data . Otsuka Masaaki et al. . The Astrophysical Journal Supplement Series, Volume 217, Issue 2, article id. 22, 25 pp. (2015). . 217 . 10.1088\/0067-0049\/217\/2\/22 . 2015ApJS..217...22O ,
A Multi-band Catalog of 10978 Star Clusters, Associations, and Candidates in the Milky Way . Bica Eduardo et al. . The Astronomical Journal, Volume 157, Issue 1, article id. 12, 14 pp. (2019). . 157 . 10.3847\/1538-3881\/aaef8d . 2019AJ....157...12B ,
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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2012-12-07T11:08:38Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2012-12-07T11:08:38Z, OT2_mboyer_1, SPG v14.2.0. https://doi.org/10.5270/esa-t2c8krw