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Observational Constraints on Planet Nine: Cassini Range Observations
Holman, Matthew J.; Payne, Matthew J.
We examine the tidal perturbations induced by a possible additional, distant planet in the solar system on the distance between the Earth and the Cassini spacecraft. We find that measured range residuals alone can significantly constrain the sky position, distance, and mass of the perturbing planet to sections of the sky essentially orthogonal to …
NuSTAR and XMM-Newton Observations of the Hard X-Ray Spectrum of Centaurus A
Harrison, F. A.; Stern, D.; Farrah, D. +28 more
We present simultaneous XMM-Newton and Nuclear Spectroscopic Telescope Array (NuSTAR) observations spanning 3-78 keV of the nearest radio galaxy, Centaurus A (Cen A). The accretion geometry around the central engine in Cen A is still debated, and we investigate possible configurations using detailed X-ray spectral modeling. NuSTAR imaged the centr…
Planck intermediate results. XLIII. Spectral energy distribution of dust in clusters of galaxies
Kneissl, R.; Miville-Deschênes, M. -A.; Planck Collaboration +179 more
Although infrared (IR) overall dust emission from clusters of galaxies has been statistically detected using data from the Infrared Astronomical Satellite (IRAS), it has not been possible to sample the spectral energy distribution (SED) of this emission over its peak, and thus to break the degeneracy between dust temperature and mass. By complemen…
Constraints on the running of the running of the scalar tilt from CMB anisotropies and spectral distortions
Di Valentino, Eleonora; Melchiorri, Alessandro; Cabass, Giovanni +2 more
We use the recent observations of cosmic microwave background (CMB) temperature and polarization anisotropies provided by the Planck satellite experiment to place constraints on the running αs=d ns/d log k and the running of the running βs=d αs/d log k of the spectral index ns of primordial sc…
A Search for an Optical Counterpart to the Gravitational-wave Event GW151226
Della Valle, M.; Sollerman, J.; Gal-Yam, A. +37 more
We present a search for an electromagnetic counterpart of the gravitational-wave source GW151226. Using the Pan-STARRS1 telescope we mapped out 290 square degrees in the optical I P1 filter, starting 11.5 hr after the LIGO information release and lasting for an additional 28 days. The first observations started 49.5 hr after the time of…
The SOPHIE search for northern extrasolar planets. IX. Populating the brown dwarf desert
Bouchy, F.; Deleuil, M.; Moutou, C. +20 more
Radial velocity planet search surveys of nearby solar-type stars have shown a strong scarcity of brown dwarf companions within ~5 AU. There is presently no comprehensive explanation for this lack of brown dwarf companions; therefore, increasing the sample of such objects is crucial to understand their formation and evolution. Based on precise radi…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - X. The radial distribution of stellar populations in NGC 2808
Milone, A. P.; Bedin, L. R.; Piotto, G. +4 more
Due to their extreme helium abundance, the multiple stellar populations of the globular cluster NGC 2808 have been widely investigated from a photometric, spectroscopic, and kinematic perspective. The most striking feature of the colour-magnitude diagram of NGC 2808 is the triple main sequence (MS), with the red MS corresponding to a stellar popul…
Lighting the Dark Molecular Gas: H2 as a Direct Tracer
Togi, Aditya; Smith, J. D. T.
Robust knowledge of molecular gas mass is critical for understanding star formation in galaxies. The {{{H}}}2 molecule does not emit efficiently in the cold interstellar medium, hence the molecular gas content of galaxies is typically inferred using indirect tracers. At low metallicity and in other extreme environments, these tracers ca…
Extreme star formation events in quasar hosts over 0.5 < z < 4
Wang, L.; Feltre, A.; Hatziminaoglou, E. +7 more
We explore the relationship between active galactic nuclei (AGN) and star formation in a sample of 513 optically luminous type 1 quasars up to redshifts of ∼4 hosting extremely high star formation rates (SFRs). The quasars are selected to be individually detected by the Herschel SPIRE instrument at >3σ at 250 µm, leading to typical SFRs o…
Towards the statistical detection of the warm-hot intergalactic medium in intercluster filaments of the cosmic web
Prochaska, J. Xavier; Tejos, Nicolas; Morris, Simon L. +6 more
Modern analyses of structure formation predict a universe tangled in a `cosmic web' of dark matter and diffuse baryons. These theories further predict that at low z, a significant fraction of the baryons will be shock-heated to T ∼ 105-107 K yielding a warm-hot intergalactic medium (WHIM), but whose actual existence has elude…