2001ApJ...553L.125B -
Astrophys. J., 553, L125-L128 (2001/June-1)
The detection of a cooling flow elliptical galaxy from O VI emission.
BREGMAN J.N., MILLER E.D. and IRWIN J.A.
Abstract (from CDS):
Cooling flow models for the hot gas in elliptical galaxies predict that gas is cooling at a rate of ∼1 M☉.yr–1, yet there is little evidence for this phenomenon beyond the X-ray wave band. If hot gas is cooling, it will pass through the 3x105 K regime and radiate in the O VI λλ1032, 1038 ultraviolet lines, which can be detected with the Far-Ultraviolet Spectroscopic Explorer (FUSE), and here we report on FUSE observations of the X-ray bright early-type galaxies NGC 1404 and NGC 4636. In NGC 1404, the O VI doublet is not detected, implying a cooling rate less than 0.3 M☉.yr–1, which is below the predicted values from the cooling flow model of 0.4-0.9 M☉.yr–1. In NGC 4636, both O VI lines are clearly detected, indicating a cooling rate of 0.43±0.06 M☉.yr–1, which falls within the range of values from the cooling flow prediction, 0.36-2.3 M☉.yr–1, and is closest to the model where the production of the cooled gas is distributed through the galaxy. The emission-line widths, 44±15 km.s–1, are close to the Doppler broadening value (30 km.s–1), indicating that the flow is quiescent rather than turbulent and that the flow velocity is less than 30 km.s–1.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Individual: NGC Number: NGC 1404 - Galaxies: Individual: NGC Number: NGC 4636 - Galaxies: ISM
Simbad objects:
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