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The far-infrared emitting region in local galaxies and QSOs: Size and scaling relations
Berta, S.; Lutz, D.; Förster Schreiber, N. M. +9 more
We use Herschel 70 to 160 µm images to study the size of the far-infrared emitting region in about 400 local galaxies and quasar (QSO) hosts. The sample includes normal "main-sequence" star-forming galaxies, as well as infrared luminous galaxies and Palomar-Green QSOs, with different levels and structures of star formation. Assuming Gaussian…
Titan's surface at 2.18-cm wavelength imaged by the Cassini RADAR radiometer: Results and interpretations through the first ten years of observation
Lorenz, R. D.; Janssen, M. A.; Hayes, A. G. +12 more
A comprehensive calibration and mapping of the thermal microwave emission from Titan's surface is reported based on radiometric data obtained at 2.18-cm wavelength by the passive radiometer included in the Cassini RADAR instrument. Compared to previous work, the present results incorporate the much larger data set obtained in the approximately ten…
First Images of Debris Disks around TWA 7, TWA 25, HD 35650, and HD 377
Stark, Christopher C.; Schneider, Glenn; Chen, Christine H. +15 more
We present the first images of four debris disks observed in scattered light around the young (4-250 Myr old) M dwarfs TWA 7 and TWA 25, the K6 star HD 35650, and the G2 star HD 377. We obtained these images by reprocessing archival Hubble Space Telescope NICMOS coronagraph data with modern post-processing techniques as part of the Archival Legacy…
The XXL Survey . IV. Mass-temperature relation of the bright cluster sample
Smith, G. P.; Chiappetti, L.; Pierre, M. +18 more
Context. The XXL Survey is the largest survey carried out by XMM-Newton. Covering an area of 50 deg2, the survey contains ~450 galaxy clusters out to a redshift ~2 and to an X-ray flux limit of ~ 5 × 10-15 erg s-1 cm-2. This paper is part of the first release of XXL results focussed on the bright cluster…
Constraint on the abundance of primordial black holes in dark matter from Planck data
Huang, Qing-Guo; Wang, Ke; Chen, Lu
We use Planck data released in 2015 to constrain the abundance of primordial black holes (PBHs) in dark matter in two different reionization models (one is the instantaneous reionization and the other is the asymmetric reionization), and significantly improve the existing upper limits on the abundance of PBHs by around two orders of magnitude. The…
New CMB constraints for Abelian Higgs cosmic strings
Kunz, Martin; Lizarraga, Joanes; Urrestilla, Jon +2 more
We present cosmic microwave background (CMB) power spectra from recent numerical simulations of cosmic strings in the Abelian Higgs model and compare them to CMB power spectra measured by Planck. We obtain revised constraints on the cosmic string tension parameter Gµ. For example, in the ΛCDM model with the addition of strings and no primord…
Dust properties of Lyman-break galaxies at z ~ 3
Pérez-Fournon, I.; Rodighiero, G.; Ilbert, O. +18 more
Context. Since the mid-1990s, the sample of Lyman-break galaxies (LBGs) has been growing thanks to the increasing sensitivities in the optical and in near-infrared telescopes for objects at z> 2.5. However, the dust properties of the LBGs are poorly known because the samples are small and/or biased against far-infrared (far-IR) or submillimeter…
Probing primordial features with future galaxy surveys
Finelli, F.; Moscardini, L.; Ballardini, M. +1 more
We study the capability of future measurements of the galaxy clustering power spectrum to probe departures from a power-law spectrum for primordial fluctuations. On considering the information from the galaxy clustering power spectrum up to quasi-linear scales, i.e. k < 0.1 h Mpc-1, we present forecasts for DESI, Euclid and SPHEREx i…
The Rotation of the Hot Gas around the Milky Way
Bregman, Joel N.; Miller, Matthew J.; Hodges-Kluck, Edmund J.
The hot gaseous halos of galaxies likely contain a large amount of mass and are an integral part of galaxy formation and evolution. The Milky Way has a 2× {10}6 K halo that is detected in emission and by absorption in the O vii resonance line against bright background active galactic nuclei (AGNs), and for which the best current model i…
Systematic comparison of photoionised plasma codes with application to spectroscopic studies of AGN in X-rays
Kaastra, J. S.; Mehdipour, M.; Kallman, T.
Atomic data and plasma models play a crucial role in the diagnosis and interpretation of astrophysical spectra, thus influencing our understanding of the Universe. In this investigation we present a systematic comparison of the leading photoionisation codes to determine how much their intrinsic differences impact X-ray spectroscopic studies of hot…