SCUBA Observations of the Elliptical Galaxy NGC 4374

Details SCUBA Observations of the Elliptical Galaxy NGC 4374 SCUBA Observations of the Elliptical Galaxy NGC 4374

1999-11-06

arxiv.org/abs/astro-ph/9911104v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03119.x

We present SCUBA imaging and photometry of the elliptical galaxy NGC 4374. The imaging observations are used to examine the spatial distribution of thermal emission from dust and the radio to infrared continuum spectrum. In the SCUBA 850 um image, the galaxy is found to be a point source, constraining the emission to less than 15'' (1.5 kpc for a distance of 20.74 Mpc). The simplest interpretation is that the 2000 um to 850 um SCUBA emission is synchroton from a compact core or inner-jet, and most unlikely thermal emission from cold diffuse dust. We cannot exclude free-free emission, but this would be very unexpected. The thermal emission from dust is shown in IRAS data and these along with the 450 um SCUBA datum give a dust temperature of 35 K, corresponding to a dust mass of 0.12 million solar masses. These are pilot observations in a program to look for cold, diffusely distributed dust in elliptical galaxies, however much deeper 450 um imaging is required to investigate this in NGC 4374.

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