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Infrared stellar populations in the central parts of the Milky Way galaxy

Blommaert, J. A. D. L.; Glass, I. S.; Omont, A. +7 more

Near- and mid-IR survey data from DENIS and ISOGAL are used to investigate the structure and formation history of the inner 10° (1.4 kpc) of the Milky Way galaxy. Synthetic bolometric corrections and extinction coefficients in the near- and mid-infrared (mid-IR) are derived for stars of different spectral types, to allow the transformation of theo…

The radio-mid-infrared correlation and the contribution of 15-µm galaxies to the 1.4-GHz source counts

Pozzi, F.; Calabrese, E.; Gruppioni, C. +5 more

The radio counterparts to the 15-µm sources in the European Large Area ISO Survey southern fields are identified in 1.4-GHz maps down to ~80 µJy. The radio-mid-infrared correlation is investigated and derived for the first time at these flux densities for a sample of this size. Our results show that radio and mid-infrared (MIR) luminos…

Far-infrared photometry of deeply embedded outflow sources

Smith, M. D.; Eislöffel, J.; Froebrich, D. +1 more

We present far-infrared maps and spectroscopy for a number of deeply embedded protostellar objects (CepE, HH211-MM, IC1396 W, L1157, L1211, and RNO 15FIR) from data that we acquired with the Infrared Space Observatory (ISO) photopolarimeter (PHOT) and Long Wavelength Spectrometer (LWS). Several previously undetected deeply embedded sources are fou…

Anatomy of the Herbig-Haro object HH7 bow shock

Smith, Michael D.; Davis, Christopher J.; Khanzadyan, Tigran

We perform a detailed shock diagnosis of the Herbig-Haro object HH7, a well-defined bow shock from a protostellar outflow. We first present molecular hydrogen images in the 2-1 S(1) and 1-0 S(1) K-band emission lines. We then introduce revised models for magneto-hydrodynamic bow shocks that incorporate a limited C and O chemistry and account for t…

The far-infrared signature of dust in high-latitude regions

del Burgo, C.; Ábrahám, P.; Laureijs, R. J. +1 more

We present ISOPHOT observations of eight interstellar regions in the 60-200 µm wavelength range. The regions belong to mostly quiescent high-latitude clouds and have optical extinction peaks from A_V~1-6 mag. From the 150- and 200-µm emission, we derived colour temperatures for the classical big grain component which show a c…

Three-dimensional photoionization modelling of the planetary nebula NGC 3918

Morisset, C.; Barlow, M. J.; Liu, X. -W. +2 more

The three-dimensional Monte Carlo photoionization code MOCASSIN has been applied to construct a realistic model of the planetary nebula NGC 3918. Three different geometric models were tried, the first being the biconical density distribution already used some years ago by Clegg et al. In this model the nebula is approximated by a biconical structu…

The identification of HCN and HNC in carbon stars: model atmospheres, synthetic spectra and fits to observations in the 2.7-4.0 µm region

Jones, H. R. A.; Tennyson, J.; Pavlenko, Ya. V. +1 more

Model carbon star atmospheres and synthetic spectra have been calculated using the recent HCN/HNC vibration rotation line list of Harris et al. The calculations are repeated using only HCN lines and show that HNC has a significant effect upon the temperature, density and optical depth of a stellar atmosphere.

We fit synthetic spectra in the 2…

The complete submillimetre spectrum of NGC 891

Bernard, J. -P.; Dupac, X.; Giard, M. +8 more

Submillimetre maps of NGC 891 have been obtained with the Programme National d'Observations Submillimétriques (PRONAOS) balloon-borne telescope and with the Infrared Space Observatory Photopolarimeter (ISOPHOT) on board the ISO satellite. In this article, we also gather data from the Infrared Astronomical Satellite (IRAS) and the Submillimetre Com…

Crystalline water ice in OH32.8-0.3

Maldoni, M. M.; Robinson, G.; Wright, C. M. +2 more

The 2.2-200 µm spectrum of OH32.8-0.3 has been modelled. Mie theory and radiative transfer models of the 3-µm band of H₂O ice are consistent with a strongly crystalline structural phase. This is also confirmed by the presence of a 44/62-µm band complex analogous to that of laboratory crystalline H₂O ice anal…

A far-infrared view of the Lockman Hole from ISO 95-µm observations - I. A new data reduction method

Rodighiero, G.; Franceschini, A.; Lari, C. +2 more

We report results from a new analysis of a deep 95-µm imaging survey with the photopolarimeter ISOPHOT on-board the Infrared Space Observatory, over a 40 × 40 arcmin² area within the Lockman Hole. To this end we exploit a newly developed parametric algorithm able to identify and clean spurious signals induced by cosmic rays impact…