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Issue A&A
Volume 408, Number 1, September II 2003
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20031139



A&A 408, L9-L12 (2003)
DOI: 10.1051/0004-6361:20031139

Letter

Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster

A. Evans1, M. Stickel2, J. Th. van Loon1, S. P. S. Eyres3, M. E. L. Hopwood1 and A. J. Penny4

1  Astrophysics Group, School of Chemistry & Physics, Keele University, Staffordshire ST5 5BG, UK
2  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
3  Space Science & Technology Department, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
4  Centre for Astrophysics, University of Central Lancashire, Preston, Lancashire PR1 2HE, UK

(Revised 3 July 2003 / Accepted 28 July 2003)

Abstract
Improved data analysis of far infrared imaging data of the globular cluster NGC 7078 obtained with the ISO instrument ISOPHOT at 60 $\mu$m, 70 $\mu$m and 90 $\mu$m has detected the thermal emission from dust in its core, the first secure detection of intra-cluster dust in a globular cluster. The amount of dust is broadly consistent with mass-loss from evolved, metal-deficient stars in NGC 7078 in the time since it last crossed the Galactic plane.


Key words: globular clusters: general -- infrared: general -- globular clusters: individual: NGC 7078 -- ISM: general

Offprint request: A. Evans, ae@astro.keele.ac.uk

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© ESO 2003


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