Search Publications
An improved model of diffuse galactic radio emission from 10 MHz to 5 THz
Reich, W.; Liu, A.; Reich, P. +6 more
We present an improved Global Sky Model (GSM) of diffuse Galactic radio emission from 10 MHz to 5 THz, whose uses include foreground modelling for cosmic microwave background (CMB) and 21 cm cosmology. Our model improves on past work both algorithmically and by adding new data sets such as the Planck maps and the enhanced Haslam map. Our method ge…
The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity
Goldman, Steven R.; Matsuura, Mikako; Whitelock, Patricia A. +8 more
We present the results of our survey of 1612-MHz circumstellar OH maser emission from asymptotic giant branch (AGB) stars and red supergiants (RSGs) in the Large Magellanic Cloud (LMC). We have discovered four new circumstellar maser sources in the LMC, and increased the number of reliable wind speeds from infrared (IR) stars in the LMC from 5 to …
The dust mass in Cassiopeia A from a spatially resolved Herschel analysis
De Looze, I.; Rho, J.; Gomez, H. L. +4 more
Theoretical models predict that core-collapse supernovae (CCSNe) can be efficient dust producers (0.1-1.0 M⊙), potentially accounting for most of the dust production in the early Universe. Observational evidence for this dust production efficiency is however currently limited to only a few CCSN remnants (e.g. SN 1987A, Crab nebula). In …
Fundamental parameters and infrared excesses of Tycho-Gaia stars
Zijlstra, A. A.; McDonald, I.; Watson, R. A.
Effective temperatures and luminosities are calculated for 1475 921 Tycho-2 and 107 145 Hipparcos stars, based on distances from Gaia Data Release 1. Parameters are derived by comparing multi-wavelength archival photometry to bt-settl model atmospheres. The 1σ uncertainties for the Tycho-2 and Hipparcos stars are ±137 and ±125 K in temperature and…
SONS: The JCMT legacy survey of debris discs in the submillimetre
Matthews, Brenda C.; Duchêne, Gaspard; Chen, Christine H. +32 more
Debris discs are evidence of the ongoing destructive collisions between planetesimals, and their presence around stars also suggests that planets exist in these systems. In this paper, we present submillimetre images of the thermal emission from debris discs that formed the SCUBA-2 Observations of Nearby Stars (SONS) survey, one of seven legacy su…
A population of eruptive variable protostars in VVV
Minniti, D.; Lucas, P. W.; Thompson, M. A. +10 more
We present the discovery of 816 high-amplitude infrared variable stars (ΔKs > 1 mag) in 119 deg2 of the Galactic mid-plane covered by the VISTA Variables in the Via Lactea (VVV) survey. Almost all are new discoveries and about 50 per cent are young stellar objects (YSOs). This provides further evidence that YSOs are the co…
Infrared spectroscopy of eruptive variable protostars from VVV
Minniti, D.; Marocco, F.; Lucas, P. W. +11 more
In a companion work (Paper I), we detected a large population of highly variable Young Stellar Objects (YSOs) in the Vista Variables in the Via Lactea (VVV) survey, typically with class I or flat spectrum spectral energy distributions and diverse light-curve types. Here we present infrared spectra (0.9-2.5 µm) of 37 of these variables, many …
The life cycles of Be viscous decretion discs: time-dependent modelling of infrared continuum observations
Carciofi, A. C.; Rivinius, Th.; Vieira, R. G. +3 more
We apply the viscous decretion disc (VDD) model to interpret the infrared disc continuum emission of 80 Be stars observed in different epochs. In this way, we determined 169 specific disc structures, namely their density scale, ρ0, and exponent, n. We found that the n values range mainly between 1.5 and 3.5, and ρ0 varies bet…
A high-resolution H I study towards the supernova remnant Puppis A and its environments
Reynoso, E. M.; Cichowolski, S.; Walsh, A. J.
We observed the supernova remnant Puppis A in the 21 cm line with the Australia Telescope Compact Array with the aim of determining the systemic velocity and, hence, the corresponding kinematic distance. For the compact, background sources in the field, we obtain absorption spectra by applying two methods: (a) subtracting profiles on- and off-sour…
Star formation and AGN activity in a sample of local luminous infrared galaxies through multiwavelength characterization
Mattila, Seppo; Alberdi, Antxon; Väisänen, Petri +8 more
Nuclear starbursts and active galactic nucleus (AGN) activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In this paper, we study the star formation and AGN activity of a sample of 11 local LIRGs imaged with subarcsecond angular resolution at radio (8.4 …