Search Publications
A mid-infrared imaging catalogue of post-asymptotic giant branch stars
Gledhill, Tim; Matsuura, Mikako; Szczerba, Ryszard +11 more
Post-asymptotic giant branch (post-AGB) stars are key objects for the study of the dramatic morphological changes of low- to intermediate-mass stars on their evolution from the AGB towards the planetary nebula stage. There is growing evidence that binary interaction processes may very well have a determining role in the shaping process of many obj…
Luminosity functions of local infrared galaxies with AKARI: implications for the cosmic star formation history and AGN evolution
Goto, Tomotsugu; Inami, Hanae; Nakagawa, Takao +15 more
Infrared (IR) luminosity is fundamental to understanding the cosmic star formation history and active galactic nuclei (AGN) evolution, since their most intense stages are often obscured by dust. However, local IR luminosity function estimates today are still based on the IRAS survey in the 1980s, with wavelength coverage only up to 100 µm. T…
Modelling galaxy and AGN evolution in the infrared: black hole accretion versus star formation activity
Pozzi, F.; Vignali, C.; Gruppioni, C. +1 more
We present a new backward evolution model for galaxies and active galactic nuclei (AGNs) in the infrared (IR). What is new in this model is the separate study of the evolutionary properties of different IR populations (i.e. spiral galaxies, starburst galaxies, low-luminosity AGNs, 'unobscured' type 1 AGNs and 'obscured' type 2 AGNs) defined throug…
Three-dimensional chemically homogeneous and bi-abundance photoionization models of the `super-metal-rich' planetary nebula NGC 6153
Yuan, H. -B.; Zhang, Y.; Liu, X. -W. +3 more
Deep spectroscopy of the planetary nebula NGC 6153 shows that its heavy element abundances derived from optical recombination lines (ORLs) are 10 times higher than those derived from collisionally excited lines (CELs), and points to the existence of H-deficient inclusions embedded in the diffuse nebula. In this study, we have constructed chemicall…
A 3D photoionization model of the extreme planetary nebula NGC 6302
Rauch, T.; Barlow, M. J.; Wright, N. J. +1 more
We present a 3D photoionization model of the planetary nebula NGC 6302, one of the most complex and enigmatic objects of its kind. Its highly bipolar geometry and dense massive disc, coupled with the very wide range of ions present, from neutral species up to Si8 +, make it one of the ultimate challenges to nebular photoionization model…
Dust-correlated cm wavelength continuum emission from translucent clouds ζ Oph and LDN 1780
Bond, J. R.; Davies, R. D.; Davis, R. J. +17 more
The diffuse cm wave IR-correlated signal, the 'anomalous' CMB foreground, is thought to arise in the dust in cirrus clouds. We present Cosmic Background Imager (CBI) cm wave data of two translucent clouds, ζ Oph and LDN 1780 with the aim of characterizing the anomalous emission in the translucent cloud environment.
In ζ Oph, the measured brig…Infrared two-colour diagrams for AGB stars using AKARI, MSX, IRAS and near-infrared data
Suh, Kyung-Won; Kwon, Young-Joo
Using a revised version of the catalogue of asymptotic giant branch (AGB) stars by Suh & Kwon, we present various infrared two-colour diagrams (2CDs) for 3003 O-rich, 1168 C-rich, 362 S-type and 35 silicate carbon stars in our Galaxy. For each object in the new catalogue, we cross-identify the AKARI, Midcourse Space Experiment (MSX) and Two-Mi…
Far-infrared luminosity function of local star-forming galaxies in the AKARI Deep Field-South
Goto, Tomotsugu; Clements, D. L.; Shirahata, Mai +8 more
We present a far-infrared galaxy luminosity function for the local universe. We have obtained 389 spectroscopic redshifts for galaxies observed at 90 µm in the AKARI Deep Field-South, using the AAOmega fibre spectrograph via optical identifications in the digitized sky survey and 4-m class optical imaging. For the luminosity function present…
The halo and rings of the planetary nebula NGC 40 in the mid-infrared
Ramos-Larios, G.; Phillips, J. P.; Cuesta, L. C.
We present the imaging and spectroscopy of NGC 40 acquired using the Spitzer Space Telescope and the Infrared Space Observatory. These are used to investigate the nature of emission from the central nebular shell, from the nebular halo and from the associated circumnebular rings. It is pointed out that a variety of mechanisms may contribute to the…
Debris disc candidates in systems with transiting planets
Krivov, A. V.; Löhne, T.; Neuhäuser, R. +2 more
Debris discs are known to exist around many planet-host stars, but no debris dust has been found so far in systems with transiting planets. Using publicly available catalogues, we searched for infrared excesses in such systems. In the recently published Wide-field Infrared Survey Explorer catalogue, we found 52 stars with transiting planets. Two s…