Search Publications
Missions
Journals
Publication Years
The IRX-β relation on subgalactic scales in star-forming galaxies of the Herschel Reference Survey
Ciesla, L.; Buat, V.; Boquien, M. +13 more
Aims: It is still not understood why star-forming galaxies deviate from the ultraviolet colour-attenuation relation of starburst galaxies. Previous work and models hint that the role of the shape of the attenuation curve and the age of stellar populations play an important role. In this paper we aim at understanding the fundamental reasons fo…
Evolution of the Quasar Luminosity Function over 3 < z < 5 in the COSMOS Survey Field
Salvato, M.; Hasinger, G.; Capak, P. +10 more
We investigate the high-redshift quasar luminosity function (QLF) down to an apparent magnitude of I AB = 25 in the Cosmic Evolution Survey (COSMOS). Careful analysis of the extensive COSMOS photometry and imaging data allows us to identify and remove stellar and low-redshift contaminants, enabling a selection that is nearly complete fo…
The SLUGGS survey: calcium triplet-based spectroscopic metallicities for over 900 globular clusters
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +6 more
Although the colour distribution of globular clusters in massive galaxies is well known to be bimodal, the spectroscopic metallicity distribution has been measured in only a few galaxies. After redefining the calcium triplet index-metallicity relation, we use our relation to derive the metallicity of 903 globular clusters in 11 early-type galaxies…
Analysis of astrometric catalogues with vector spherical harmonics
Mignard, F.; Klioner, S.
Aims: We compare stellar catalogues with position and proper motion components using a decomposition on a set of orthogonal vector spherical harmonics. We aim to show the theoretical and practical advantages of this technique as a result of invariance properties and the independence of the decomposition from a prior model.
Methods: We de…
Information Content of Exoplanetary Transit Spectra: An Initial Look
Line, Michael R.; Zhang, Xi; Yung, Yuk L. +3 more
It has been shown that spectroscopy of transiting extrasolar planets can potentially provide a wealth of information about their atmospheres. Herein, we set up the inverse problem in spectroscopic retrieval. We use nonlinear optimal estimation to retrieve the atmospheric state (pioneered for Earth sounding by Rodgers). The formulation quantifies t…
Comparative study of CH+ and SH+ absorption lines observed towards distant star-forming regions⋆⋆⋆
Menten, K. M.; Falgarone, E.; Godard, B. +8 more
Aims: The HIFI instrument onboard Herschel has allowed high spectral resolution and sensitive observations of ground-state transitions of three molecular ions: the methylidyne cation CH+, its isotopologue 13CH+, and sulfanylium SH+. Because of their unique chemical properties, a comparative analysis…
A Jet Break in the X-Ray Light Curve of Short GRB 111020A: Implications for Energetics and Rates
Troja, E.; Sakamoto, T.; Berger, E. +8 more
We present broadband observations of the afterglow and environment of the short GRB 111020A. An extensive X-ray light curve from Swift/XRT, XMM-Newton, and Chandra, spanning ~100 s to 10 days after the burst, reveals a significant break at δt ≈ 2 days with pre- and post-break decline rates of α X, 1 ≈ -0.78 and α X, 2 <~ -…
A Suzaku survey of Fe K lines in Seyfert 1 active galactic nuclei
Porquet, D.; Reeves, J. N.; Braito, V. +3 more
We construct full broad-band models in an analysis of Suzaku observations of nearby Seyfert 1 active galactic nuclei (AGN) (z ≤ 0.2) with exposures >50 ks and with greater than 30 000 counts in order to study their iron line profiles. This results in a sample of 46 objects and 84 observations. After a full modelling of the broad-band Suzaku and…
A chronology of early Mars climatic evolution from impact crater degradation
Mangold, N.; Ansan, V.; Adeli, S. +2 more
The degradation of impact craters provides a powerful tool to analyze surface processes in the Martian past. Previous studies concluded that large impact craters (20-200 km in diameter) were strongly degraded by fluvial erosion during early Martian history. Our goal is to study the progression of crater degradation through time with a particular e…
A remarkably high fraction of strong Lyα emitters amongst luminous redshift 6.0 < z < 6.5 Lyman-break galaxies in the UKIDSS Ultra-Deep Survey
McLure, R. J.; Dunlop, J. S.; Cirasuolo, M. +8 more
We present spectroscopic confirmation of 10 highly luminous (L≥ 2L★) Lyα emitters (LAEs) in the redshift range 6.01 < z < 6.49 (nine galaxies and one active galactic nucleus), initially drawn from a sample of 14 zphot≥ 6 Lyman-break galaxies (LBGs) selected from an area of 0.25 deg2 within the UK Infrared Dee…