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The 1-1000µm spectral energy distributions of far-infrared galaxies

Dole, H.; Lagache, G.; Scott, D. +3 more

Galaxies selected at 170µm by the Infrared Space Observatory (ISO) Far-IR BACKground (FIRBACK) survey represent the brightest ~10 per cent of the cosmic infrared background. Examining their nature in detail is therefore crucial for constraining models of galaxy evolution. Here, we combine Spitzer archival data with previous near-infrared (ne…

A far-infrared molecular and atomic line survey of the Orion KL region

Barlow, M. J.; Cernicharo, J.; Goicoechea, J. R. +8 more

We have carried out a high spectral resolution (λ/Δλ ~ 6800-9700) line survey towards the Orion Kleinmann-Low (KL) cluster from 44 to 188 µm. The observations were taken with the Long Wavelength Spectrometer (LWS) in Fabry-Pérot mode, on board the Infrared Space Observatory (ISO). A total of 152 lines are clearly detected and a further 34 fe…

SCUBA observations of the Horsehead nebula - what did the horse swallow?

Bontemps, S.; Ward-Thompson, D.; Nutter, D. +2 more

We present observations taken with the Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT) of the Horsehead nebula in Orion (B33), at wavelengths of 450 and 850 µm. We see bright emission from that part of the cloud associated with the photon-dominated region (PDR) at the `top' of the horse's head, w…

Constraints on the nature of dust particles by infrared observations

Ábrahám, P.; Birkmann, S. M.; Laureijs, R. J. +2 more

The far-infrared (FIR) emissivity of dust is an important parameter characterizing the physical properties of the grains. With the availability of stellar data bases and FIR data from Infrared Space Observatory (ISO), it is possible to compare the optical and infrared properties of dust, and derive the FIR emissivity with respect to the optical ex…

Challenging the identification of nitride dust in extreme carbon star spectra

Speck, A. K.; Pitman, K. M.; Hofmeister, A. M.

Nitride dust is predicted to form in small amounts around carbon stars, but the most likely candidate species such as aluminium nitride (AlN) have not yet been detected. Recently, α-Si₃N₄ was inferred to be the main carrier of the 8.5-12.5 µm absorption band(s) of an extreme carbon star (AFGL 5625), based on comparison …

Properties of dust and detection of Hα emission in LDN 1780

del Burgo, C.; Cambrésy, L.

We present ISOPHOT observations between 60 and 200µm and a near-infrared extinction map of the small intermediate-density cloud Lynds Dark Nebula (LDN) 1780 (Galactic coordinates l = 359° and b = 36.8°). For an angular resolution of 4arcmin, the visual extinction maximum is A_V = 4.4mag. We have used the ISOPHOT data together with …