Search Publications
The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)
de Graauw, Th.; Beintema, D. A.; Murphy, J. A. +163 more
Aims: This paper describes the Heterodyne Instrument for the Far-Infrared (HIFI) that was launched onboard ESA's Herschel Space Observatory in May 2009.
Methods: The instrument is a set of 7 heterodyne receivers that are electronically tuneable, covering 480-1250 GHz with SIS mixers and the 1410-1910 GHz range with hot electron bolometer…
The X-ray to optical-UV luminosity ratio of X-ray selected type 1 AGN in XMM-COSMOS
Le Floc'h, E.; Jahnke, K.; Salvato, M. +29 more
We present a study of the X-ray to optical properties of a sample of 545 X-ray selected type 1 AGN, from the XMM-COSMOS survey, over a wide range of redshifts (0.04 < z < 4.25) and X-ray luminosities (40.6 ≤ Log L[2-10]~keV ≤ 45.3). About 60% of them are spectroscopically identified type 1 AGN, while the others have a reliable pho…
Evidence of the accelerated expansion of the Universe from weak lensing tomography with COSMOS
Benabed, K.; Simon, P.; Schrabback, T. +19 more
We present a comprehensive analysis of weak gravitational lensing by large-scale structure in the Hubble Space Telescope Cosmic Evolution Survey (COSMOS), in which we combine space-based galaxy shape measurements with ground-based photometric redshifts to study the redshift dependence of the lensing signal and constrain cosmological parameters. Af…
Evaporation of the planet HD 189733b observed in H I Lyman-α
Ehrenreich, D.; Udry, S.; Ferlet, R. +7 more
We observed three transits of the extrasolar planet HD 189733b in H i Lyman-α and in a few other lines in the ultraviolet with HST/ACS, in the search for atmospheric signatures. We detect a transit signature in the Lyman-α light curve with a transit depth of 5.05 ± 0.75%. This depth exceeds the occultation depth produced by the planetary disk alon…
Gas entropy in a representative sample of nearby X-ray galaxy clusters (REXCESS): relationship to gas mass fraction
Böhringer, H.; Arnaud, M.; Pratt, G. W. +6 more
We examine the radial entropy distribution and its scaling using 31 nearby galaxy clusters from the representative XMM-Newton cluster structure survey (REXCESS), a sample in the temperature range 2-9 keV selected in X-ray luminosity only, with no bias toward any particular morphological type. The entropy profiles are robustly measured at least out…
HerMES: The SPIRE confusion limit
Aussel, H.; Elbaz, D.; Valtchanov, I. +69 more
We report on the sensitivity of SPIRE photometers on the Herschel Space Observatory. Specifically, we measure the confusion noise from observations taken during the science demonstration phase of the Herschel Multi-tiered Extragalactic Survey. Confusion noise is defined to be the spatial variation of the sky intensity in the limit of infinite inte…
Black hole accretion and star formation as drivers of gas excitation and chemistry in Markarian 231
Veilleux, S.; Sanders, D. B.; Savini, G. +34 more
We present a full high resolution SPIRE FTS spectrum of the nearby ultraluminous infrared galaxy Mrk 231. In total 25 lines are detected, including CO J = 5-4 through J = 13-12, 7 rotational lines of H2O, 3 of OH+ and one line each of H2O+, CH+, and HF. We find that the excitation of the CO ro…
Weighing simulated galaxy clusters using lensing and X-ray
Rasia, E.; Mazzotta, P.; Ettori, S. +5 more
Context. Among the methods employed to measure the mass of galaxy clusters, the techniques based on lensing and X-ray analyses are perhaps the most widely used; however, the comparison between these mass estimates is often difficult and, in several clusters, the results apparently inconsistent.
Aims: We aim at investigating potential biases i…
Herschel-PACS spectroscopic diagnostics of local ULIRGs: Conditions and kinematics in Markarian 231
Lutz, D.; Genzel, R.; Poglitsch, A. +9 more
In this first paper on the results of our Herschel PACS survey of local ultra luminous infrared galaxies (ULIRGs), as part of our SHINING survey of local galaxies, we present far-infrared spectroscopy of Mrk 231, the most luminous of the local ULIRGs, and a type 1 broad absorption line AGN. For the first time in a ULIRG, all observed far-infrared …
The Aquila prestellar core population revealed by Herschel
Olofsson, G.; Abergel, A.; Roussel, H. +37 more
The origin and possible universality of the stellar initial mass function (IMF) is a major issue in astrophysics. One of the main objectives of the Herschel Gould Belt Survey is to clarify the link between the prestellar core mass function (CMF) and the IMF. We present and discuss the core mass function derived from Herschel data for the large pop…