Search Publications
A deep VLA survey at 20 CM of the ISO ELAIS survey regions
Genzel, R.; Cesarsky, C.; Danese, L. +11 more
We have used the Very Large Array (VLA) in C configuration to carry out a sensitive 20-cm radio survey of regions of sky that have been surveyed in the far-infrared (FIR) over the wavelength range 5--200 µm with ISO (Infrared Space Observatory) as part of the European Large-Area ISO Survey (ELAIS). As usual in surveys based on a relatively s…
A 1.4-GHz survey of the southern European Large-Area ISO Survey region
Genzel, R.; Cesarsky, C.; Danese, L. +13 more
A deep survey of the European Large-Area ISO Survey (ELAIS) field in the southern celestial hemisphere (hereinafter S1) has been carried out with the Australia Telescope Compact Array (ATCA) at 1.4 GHz. The S1 region, covering about 4 deg^2, has also been surveyed in the mid- and far-infrared (5-200 µm) with the Infrared Space Observatory (I…
Properties of hot stars in the Wolf-Rayet galaxy NGC 5253 from ISO-SWS spectroscopy
Sutherland, Ralph S.; Conti, Peter S.; Morris, Patrick W. +3 more
ISO-SWS spectroscopy of the Wolf-Rayet galaxy NGC 5253 is presented, and analysed to provide estimates of its hot young star population. Our approach differs from previous investigations in that we are able to distinguish between the regions in which different infrared fine-structure lines form, using complementary ground-based observations. The h…
ISOGAL survey of Baade's Windows in the mid-infrared
Alard, C.; Blommaert, J. A. D. L.; Ganesh, S. +6 more
The ISOGAL mid-infrared survey of areas close to the Galactic plane aims to determine the stellar content of those areas, and its possible bearing on the history of the Galaxy. The NGC 6522 and Sgr I Baade's Windows of low obscuration towards the inner parts of the Galactic bulge represent ideal places in which to calibrate and understand the ISOG…
200-µm ISO observations of NGC 6946: evidence for an extended distribution of cold dust
Bianchi, S.; Davies, J. I.; Evans, R. +2 more
We have used the Infrared Space Observatory (ISO) to obtain a resolved 200-µm image of the nearby spiral galaxy NGC 6946. We compare these observations with those made at 60 and 100 µm by the Infrared Astronomical Satellite (IRAS). Whereas IRAS mainly detected warm dust (T ~ 30 K) heated by star-forming regions, ISO detects an extended…
Observations and a model for the infrared continuum of Centaurus A
Lutz, D.; Sturm, E.; Alexander, D. M. +4 more
We present ISOSWS, ISOPHOT_S and 8-13µm observations of Centaurus A which show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that, in a small nuclear aperture (~4arcsec, ~60pc), the spectral energy distribution is characteristic of emission from a starburst and dus…
[Cii] 158-µm observations of a sample of late-type galaxies from the Virgo cluster
Metcalfe, L.; Völk, H. J.; Heinrichsen, I. +6 more
We have observed 19 Virgo cluster spiral galaxies with the Long Wavelength Spectrometer (LWS) onboard ESA's Infrared Space Observatory (ISO) obtaining spectra around the [Cii] 157.741-µm fine-structure line. These 19 galaxies are quiescent in star-forming activity compared with previous studies from airborne observatories, sample RC3 types 0…
[CII] emission and star formation in late-type galaxies
Tuffs, R. J.; Pierini, D.; Leech, K. J. +1 more
We demonstrate the existence of a reasonably tight linear correlation between the ratio of the [CII (^2P_3/2-^2 P_1/2)] (lambda 158 mu m) fine-structure cooling line intensity to the [^12CO (J=1 -> 0)] (lambda 2.6 mm) line emission, I_CII/I_CO, and the H alpha (lambda 6563 A ) equivalent width (EW), over the range 2-71 A in H alpha EW, for a sa…
H_2 emission from shocks in molecular outflows: the significance of departures from a stationary state
Pineau des Forêts, G.; Flower, D. R.
We have computed the time dependence of the H_2 rovibrational emission spectrum from molecular outflows. This emission arises in shock waves generated by the impact of jets, associated with low-mass star formation, on molecular gas. The shocks are unlikely to have attained a state of equilibrium, and so their structure will exhibit both C- and J-t…
Modelling ISO galaxy counts with luminosity and merger rate evolution
Eales, Stephen A.; Roche, Nathan
We model galaxy evolution in the 6.75- and 15-µm passbands of the ISO satellite, by combining models of galaxy evolution at optical wavelengths (which are consistent with the optical galaxy counts) with observed spectral energy distributions in the infrared. Our model is consistent with the local 12-µm galaxy luminosity function (from …