Search Publications
The Herschel census of infrared SEDs through cosmic time
Berta, S.; Magnelli, B.; Nordon, R. +57 more
Using Herschel data from the deepest SPIRE and PACS surveys (HerMES and PEP) in COSMOS, GOODS-S and GOODS-N, we examine the dust properties of infrared (IR)-luminous (LIR > 1010 L⊙) galaxies at 0.1 < z < 2 and determine how these evolve with cosmic time. The unique angle of this work is the rigorous analys…
The sub-mJy radio sky in the Extended Chandra Deep Field-South: source population
Tozzi, P.; Mainieri, V.; Rosati, P. +5 more
The sub-mJy radio population is a mixture of active systems, that is star-forming galaxies (SFGs) and active galactic nuclei (AGNs). We study a sample of 883 radio sources detected at 1.4 GHz in a deep Very Large Array survey of the Extended Chandra Deep Field-South that reaches a best rms sensitivity of 6 µJy. We have used a simple scheme t…
Resolved debris discs around A stars in the Herschel DEBRIS survey
Matthews, Brenda C.; Duchêne, Gaspard; Kalas, Paul +12 more
The majority of debris discs discovered so far have only been detected through infrared excess emission above stellar photospheres. While disc properties can be inferred from unresolved photometry alone under various assumptions for the physical properties of dust grains, there is a degeneracy between disc radius and dust temperature that depends …
SN 2009ip à la PESSTO: no evidence for core collapse yet
Zhou, George; Fraser, Morgan; Benetti, Stefano +35 more
We present ultraviolet, optical and near-infrared observations of the interacting transient SN 2009ip, covering the period from the start of the outburst in 2012 October until the end of the 2012 observing season. The transient reached a peak magnitude of MV = -17.7 mag, with a total integrated luminosity of 1.9 × 1049 erg ov…
The evolution of the mass-size relation for early-type galaxies from z ∼ 1 to the present: dependence on environment, mass range and detailed morphology
Finoguenov, A.; Huertas-Company, M.; Kneib, J. P. +7 more
We study the dependence of the galaxy size evolution on morphology, stellar mass and large-scale environment for a sample of 298 group and 384 field quiescent early-type galaxies from the COSMOS survey, selected from z ∼ 1 to the present, and with masses log(M/M⊙) > 10.5.
From a detailed morphological analysis we infer that ∼80 …Interferometric radii of bright Kepler stars with the CHARA Array: θ Cygni and 16 Cygni A and B
Stello, D.; White, T. R.; Baron, F. +18 more
We present the results of long-baseline optical interferometry observations using the Precision Astronomical Visual Observations (PAVO) beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array to measure the angular sizes of three bright Kepler stars: θ Cygni, and both components of the binary system 16 Cygni. Supporting inf…
Discovery of high-frequency iron K lags in Ark 564 and Mrk 335
Fabian, A. C.; Uttley, P.; Cackett, E. M. +3 more
We use archival XMM-Newton observations of Ark 564 and Mrk 335 to calculate the frequency-dependent time lags for these two well-studied sources. We discover high-frequency Fe K lags in both sources, indicating that the red wing of the line precedes the rest-frame energy by roughly 100 and 150 s for Ark 564 and Mrk 335, respectively. Including the…
Calibration of the total infrared luminosity of nearby galaxies from Spitzer and Herschel bands
Helou, G.; Boquien, M.; Roussel, H. +20 more
When combined with infrared observations with the Spitzer telescope (3 to 160 µm), the Herschel Space Observatory now fully samples the thermal dust emission up to 500 µm and enables us to better estimate the total infrared-submm energy budget (LTIR) of nearby galaxies. We present new empirical calibrations to estimate resol…
Long XMM observation of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: rapid variability, high spin and a soft lag
Young, A. J.; Brandt, W. N.; Ponti, G. +21 more
The narrow-line Seyfert 1 galaxy IRAS 13224-3809 has been observed with XMM-Newton for 500 ks. The source is rapidly variable on time-scales down to a few 100 s. The spectrum shows strong broad Fe - K and L emission features which are interpreted as arising from reflection from the inner parts of an accretion disc around a rapidly spinning black h…
Flux calibration of the Herschel★-SPIRE photometer
Valtchanov, I.; Bock, J. J.; Spencer, L. D. +16 more
We describe the procedure used to flux calibrate the three-band submillimetre photometer in the Spectral and Photometric Imaging Receiver instrument on the Herschel Space Observatory. This includes the equations describing the calibration scheme, a justification for using Neptune as the primary calibration source, a description of the observations…