Search Publications
Star formation in the local Universe from the CALIFA sample. I. Calibrating the SFR using integral field spectroscopy data
Bomans, D. J.; Galbany, L.; Kennicutt, R. C. +24 more
Context. The star formation rate (SFR) is one of the main parameters used to analyze the evolution of galaxies through time. The need for recovering the light reprocessed by dust commonly requires the use of low spatial resolution far-infrared data. Recombination line luminosities provide an alternative, although uncertain dust-extinction correcti…
The AKARI far-infrared all-sky survey maps
Nakagawa, Takao; Doi, Yasuo; Takita, Satoshi +15 more
We present a far-infrared all-sky atlas from a sensitive all-sky survey using the Japanese AKARI satellite. The survey covers > 99% of the sky in four photometric bands centred at 65 µm, 90 µm, 140 µm, and 160 µm, with spatial resolutions ranging from 1' to 1{^''.}5. These data provide crucial information on t…
Rest-frame Optical Spectra and Black Hole Masses of 3 < z < 6 Quasars
Goto, Tomotsugu; Nakagawa, Takao; Fan, Xiaohui +11 more
We present the rest-frame optical spectral properties of 155 luminous quasars at 3.3 < z < 6.4 taken with the AKARI space telescope, including the first detection of the Hα emission line as far out as z ∼ 6. We extend the scaling relation between the rest-frame optical continuum and the line luminosity of active galactic nuclei (AGNs) to the…
Hierarchical progressive surveys. Multi-resolution HEALPix data structures for astronomical images, catalogues, and 3-dimensional data cubes
Boch, T.; Fernique, P.; Pineau, F. -X. +8 more
Context. Scientific exploitation of the ever increasing volumes of astronomical data requires efficient and practical methods for data access, visualisation, and analysis. Hierarchical sky tessellation techniques enable a multi-resolution approach to organising data on angular scales from the full sky down to the individual image pixels.
Aims…
Mixed aliphatic and aromatic composition of evaporating very small grains in NGC 7023 revealed by the 3.4/3.3 µm ratio
Boulanger, F.; Joblin, C.; Onaka, T. +1 more
Context. A chemical scenario was proposed for photon-dominated regions (PDRs) according to which UV photons from nearby stars lead to the evaporation of very small grains (VSGs) and the production of gas-phase polycyclic aromatic hydrocarbons (PAHs).
Aims: Our goal is to achieve better insight into the composition and evolution of evaporating…
A near-infrared spectroscopic survey of massive jets towards extended green objects
Sanna, A.; Stecklum, B.; Linz, H. +2 more
Context. Protostellar jets and outflows are the main outcome of the star formation process, and their analysis can provide us with major clues about the ejection and accretion history of young stellar objects (YSOs).
Aims: We aim at deriving the main physical properties of massive jets from near-infrared (NIR) observations, comparing them to …
The IRAS PSC/FSC Combined Catalogue
Mickaelian, A. M.; Abrahamyan, H. V.; Knyazyan, A. V.
Optical identifications of a few thousands of IRAS sources showed that IRAS Point Source and IRAS Faint Source catalogues (PSC and FSC, respectively) contain many quasars and active galactic nuclei, late-type stars, planetary nebulae, variables, etc. To increase the efficiency of using IRAS PSC and FSC, which contain a lot of common sources, one n…
New light on Galactic post-asymptotic giant branch stars - I. First distance catalogue
Parker, Quentin A.; Vickers, Shane B.; Frew, David J. +1 more
We have commenced a detailed analysis of the known sample of Galactic post-asymptotic giant branch (PAGB) objects compiled in the Toruń catalogue of Szczerba et al., and present, for the first time, homogeneously derived distance determinations for the 209 likely and 87 possible catalogued PAGB stars from that compilation. Knowing distances are es…
Spitzer infrared spectrograph point source classification in the Small Magellanic Cloud
van Loon, J. Th.; Antoniou, V.; Szczerba, R. +16 more
The Magellanic Clouds are uniquely placed to study the stellar contribution to dust emission. Individual stars can be resolved in these systems even in the mid-infrared, and they are close enough to allow detection of infrared excess caused by dust. We have searched the Spitzer Space Telescope data archive for all Infrared Spectrograph (IRS) stari…
Circumstellar Dust around AGB Stars and Implications for Infrared Emission from Galaxies
Conroy, Charlie; Johnson, Benjamin D.; Villaume, Alexa
Stellar population synthesis (SPS) models are used to infer many galactic properties including star formation histories, metallicities, and stellar and dust masses. However, most SPS models neglect the effect of circumstellar dust shells around evolved stars and it is unclear to what extent they impact the analysis of spectral energy distributions…