Search Publications
Semi-analytic modelling of the extragalactic background light and consequences for extragalactic gamma-ray spectra
Somerville, Rachel S.; Primack, Joel R.; Domínguez, Alberto +1 more
Attenuation of high-energy gamma-rays by pair production with ultraviolet, optical and infrared (IR) extragalactic background light (EBL) photons provides a link between the history of galaxy formation and high-energy astrophysics. We present results from our latest semi-analytic models (SAMs), which employ the main ingredients thought to be impor…
Fundamental parameters and infrared excesses of Hipparcos stars
Zijlstra, A. A.; Boyer, M. L.; McDonald, I.
We derive the fundamental parameters (temperature and luminosity) of 107 619 Hipparcos stars and place these stars on a true Hertzsprung-Russell diagram. This is achieved by comparing BT-SETTL model atmospheres to spectral energy distributions (SEDs) created from Hipparcos, Tycho, Sloan Digital Sky Survey, DENIS, Two Micron All Sky Survey, MSX, AK…
Galaxy properties from the ultraviolet to the far-infrared: Λ cold dark matter models confront observations
Somerville, Rachel S.; Primack, Joel R.; Domínguez, Alberto +1 more
We combine a semi-analytic model of galaxy formation with simple analytic recipes describing the absorption and re-emission of starlight by dust in the interstellar medium of galaxies. We use the resulting models to predict galaxy counts and luminosity functions from the far-ultraviolet (FUV) to the submillimetre, from redshift five to the present…
The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black hole accretion events
Schawinski, Kevin; Sonnenfeld, Alessandro; Keel, William C. +8 more
Some active galactic nuclei (AGN) are surrounded by extended emission-line regions (EELRs), which trace both the illumination pattern of escaping radiation and its history over the light travel time from the AGN to the gas. From a new set of such EELRs, we present evidence that the AGN in many Seyfert galaxies undergo luminous episodes 0.2-2 ? yea…
Herschel imaging of 61 Vir: implications for the prevalence of debris in low-mass planetary systems
Ivison, R. J.; Bryden, G.; Kavelaars, J. J. +15 more
This paper describes Herschel observations of the nearby (8.5 pc) G5V multi-exoplanet host star 61 Vir at 70, 100, 160, 250, 350 and 500 ?m carried out as part of the DEBRIS survey. These observations reveal emission that is significantly extended out to a distance of >15 arcsec with a morphology that can be fitted by a nearly edge-on (77° incl…
Recurrent dust formation by WR 48a on a 30-year time-scale
Marang, Fred; Whitelock, Patricia A.; Williams, Peredur M. +4 more
We present infrared photometry of the WC8 Wolf-Rayet system WR 48a observed with telescopes at the European Southern Observatory, the South African Astronomical Observatory and the Anglo Australian Telescope between 1982 and 2011, which show a slow decline in dust emission from the previously reported outburst in 1978-79 until about 1997, when sig…
YSO jets in the Galactic plane from UWISH2 - I. MHO catalogue for Serpens and Aquila
Froebrich, D.; Ioannidis, G.
Jets and outflows from young stellar objects (YSOs) are important signposts of currently ongoing star formation. In order to study these objects, we are conducting an unbiased survey along the Galactic plane in the 1-0 S(1) emission line of molecular hydrogen at 2.122 µm using the United Kingdom Infrared Telescope. In this paper, we are focu…
Revised and updated catalogue of the First Byurakan Survey of late-type stars
Gigoyan, K. S.; Mickaelian, A. M.
There have been 15 lists of late-type stars published between 1990 and 2010. These late-type stars have been found in the low-dispersion spectroscopic plates of the First Byurakan Survey (FBS). The systematic search and selection was carried out on a surface ∼16 000 deg2 on almost the whole area of the FBS. As a result, a comprehensive …
A search for pre-substellar cores and proto-brown dwarf candidates in Taurus: multiwavelength analysis in the B213-L1495 clouds
de Gregorio-Monsalvo, I.; Eiroa, C.; Bayo, A. +9 more
In anattempt to study whether the formation of brown dwarfs (BDs) takes place as a scaled-down version of low-mass stars, we conducted Institut de Radioastronomie Millimetrique (IRAM) 30 m/MAMBO-II observations at 1.2 mm in a sample of 12 proto-BD candidates selected from Spitzer/IRAC data in the B213-L1495 clouds in Taurus. Subsequent observation…
A deep ATCA 20 cm radio survey of the AKARI Deep Field South near the South Ecliptic Pole
Goto, Tomotsugu; Nakagawa, Takao; Shirahata, Mai +18 more
The results of a deep radio survey at 20 cm wavelength are reported for a region containing the AKARI Deep Field South (ADF-S) near the South Ecliptic Pole (SEP), using the Australia Telescope Compact Array (ATCA). The survey (hereafter referred to as the ATCA-ADFS survey) has 1σ detection limits ranging from 18.7 to 50 µJy beam-1…