Open AccessStellar mass loss and the intracluster medium in Galactic globular clusters: a deep radio survey for H i and OH
Author(s) -
Van Loon Jacco Th.,
Stanimirović Snežana,
Evans A.,
Muller Erik
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.09815.x
Subject(s) - physics , globular cluster , astrophysics , intracluster medium , maser , astronomy , galaxy , galaxy cluster
We present the results of a survey, the deepest to date, for H i emission at 21 cm and OH emission at 18 cm (lines at 1612, 1665, 1667 and 1720 MHz) in the direction towards the Galactic globular clusters M15, M2, NGC 6934, NGC 7006 and Pal 13. The aim is to measure the amount of hydrogen in the intracluster medium, and to find OH masers in the circumstellar envelopes of globular cluster red giants. We present a tentative detection of 0.3 M ⊙ of neutral hydrogen in M15 and possible detections of neutral hydrogen in M2 and Pal 13. We derive upper limits to the neutral hydrogen content of NGC 6934 and 7006. No OH emission is detected. We also present deep H i data of the northern tip of the Magellanic Stream behind Pal 13.