Search Publications
Astrometric detection of giant planets around nearby M dwarfs: the Gaia potential
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +3 more
Cool M dwarfs within a few tens of parsecs from the Sun are becoming the focus of dedicated observational programs in the realm of exoplanet astrophysics. Gaia, in its all-sky survey of >109 objects, will deliver precision astrometry for a magnitude-limited (V = 20) sample of M dwarfs. We investigate some aspects of the synergy betwe…
The soft-X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view
Harrison, F. A.; Stern, D.; Zhang, W. W. +17 more
We present simultaneous XMM-Newton and NuSTAR observations of the `bare' Seyfert 1 galaxy, Ark 120, a system in which ionized absorption is absent. The NuSTAR hard-X-ray spectral coverage allows us to constrain different models for the excess soft-X-ray emission. Among phenomenological models, a cutoff power law best explains the soft-X-ray emissi…
Closing the loop: a self-consistent model of optical, X-ray and Sunyaev-Zel'dovich scaling relations for clusters of Galaxies
Bartlett, J. G.; Rykoff, E. S.; Evrard, A. E. +1 more
We demonstrate that optical data from Sloan Digital Sky Survey, X-ray data from ROSAT and Chandra, and Sunyaev-Zel'dovich (SZ) data from Planck can be modelled in a fully self-consistent manner. After accounting for systematic errors and allowing for property covariance, we find that scaling relations derived from optical and X-ray selected cluste…
The neutron star transient and millisecond pulsar in M28: from sub-luminous accretion to rotation-powered quiescence
Heinke, Craig; Bahramian, Arash; Homan, Jeroen +6 more
The X-ray transient IGR J18245-2452 in the globular cluster M28 contains the first neutron star (NS) seen to switch between rotation-powered and accretion-powered pulsations. We analyse its 2013 March-April 25 d long outburst as observed by Swift, which had a peak bolometric luminosity of ∼6 per cent of the Eddington limit (LEdd), and g…
Iron Kα emission in type-I and type-II active galactic nuclei
Paltani, S.; Gandhi, P.; Ricci, C. +3 more
The narrow Fe Kα line is one of the main signatures of the reprocessing of X-ray radiation from the material surrounding supermassive black holes, and it has been found to be omnipresent in the X-ray spectra of active galactic nuclei (AGN). In this work, we study the characteristics of the narrow Fe Kα line in different types of AGN. Using the res…
Highly accreting quasars: sample definition and possible cosmological implications
Marziani, P.; Sulentic, J. W.
We propose a method to identify quasars radiating closest to the Eddington limit, defining primary and secondary selection criteria in the optical, UV and X-ray spectral range based on the 4D eigenvector 1 formalism. We then show that it is possible to derive a redshift-independent estimate of luminosity for extreme Eddington ratio sources. Using …
The distribution of interstellar dust in CALIFA edge-on galaxies via oligochromatic radiative transfer fitting
De Looze, Ilse; Baes, Maarten; Fritz, Jacopo +5 more
We investigate the amount and spatial distribution of interstellar dust in edge-on spiral galaxies, using detailed radiative transfer modelling of a homogeneous sample of 12 galaxies selected from the Calar Alto Legacy Integral Field Area survey. Our automated fitting routine, FITSKIRT, was first validated against artificial data. This is done by …
Herschel Multitiered Extragalactic Survey: clusters of dusty galaxies uncovered by Herschel and Planck
Pérez-Fournon, I.; Clements, D. L.; de Zotti, G. +21 more
The potential for Planck to detect clusters of dusty, star-forming galaxies at z > 1 is tested by examining the Herschel-SPIRE images of Planck Early Release Compact Source Catalog sources lying in fields observed by the Herschel Multitiered Extragalactic Survey. Of the 16 Planck sources that lie in the ∼90 sq. deg. examined, we find that 12 ar…
The mass-metallicity relation at z ∼ 1.4 revealed with Subaru/FMOS
Curtis-Lake, Emma; Tamura, Naoyuki; Ohta, Kouji +16 more
We present a stellar mass-metallicity relation at z ∼ 1.4 with an unprecedentedly large sample of ∼340 star-forming galaxies obtained with Fibre Multi-Object Spectrograph (FMOS) on the Subaru Telescope. We observed K-band selected galaxies at 1.2 ≤ zph ≤ 1.6 in the Subaru XMM-Newton Deep Survey/Ultra Deep Survey fields with M*
The thermal Sunyaev-Zel'dovich effect power spectrum in light of Planck
Holder, G. P.; Le Brun, A. M. C.; McCarthy, I. G. +1 more
The amplitude of the thermal Sunyaev-Zel'dovich effect (tSZ) power spectrum is extremely sensitive to the abundance of the most massive dark matter haloes (galaxy clusters) and therefore to fundamental cosmological parameters that control their growth, such as σ8 and Ωm. Here we explore the sensitivity of the tSZ power spectr…