Search Publications
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…
Candidate Gravitationally Lensed Dusty Star-forming Galaxies in the Herschel Wide Area Surveys
Ivison, R. J.; Frayer, D. T.; Omont, A. +21 more
We present a list of candidate gravitationally lensed dusty star-forming galaxies (DSFGs) from the HerMES Large Mode Survey and the Herschel Stripe 82 Survey. Together, these partially overlapping surveys cover 372 deg2 on the sky. After removing local spiral galaxies and known radio-loud blazars, our candidate list of lensed DSFGs is c…
Deep XMM observations of Draco rule out at the 99 per cent confidence level a dark matter decay origin for the 3.5 keV line
Profumo, Stefano; Jeltema, Tesla
We searched for an X-ray line at energies around 3.5 keV in deep, ∼1.6 Ms XMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was found in either the Metal Oxide Semi-conductor (MOS) or the p-type/n-type semiconductor (PN) detectors. The data in this energy range are completely consistent with a single, unfolded power-law modelli…
The High Resolution Stereo Camera (HRSC) of Mars Express and its approach to science analysis and mapping for Mars and its satellites
Jaumann, R.; Oberst, J.; Preusker, F. +32 more
The High Resolution Stereo Camera (HRSC) of ESA's Mars Express is designed to map and investigate the topography of Mars. The camera, in particular its Super Resolution Channel (SRC), also obtains images of Phobos and Deimos on a regular basis. As HRSC is a push broom scanning instrument with nine CCD line detectors mounted in parallel, its unique…
Deep Chandra observations of Pictor A
Stawarz, Ł.; Hardcastle, M. J.; Croston, J. H. +7 more
We report on deep Chandra observations of the nearby broad-line radio galaxy Pictor A, which we combine with new Australia Telescope Compact Array (ATCA) observations. The new X-ray data have a factor of 4 more exposure than observations previously presented and span a 15 yr time baseline, allowing a detailed study of the spatial, temporal and spe…