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Development of the Model of Galactic Interstellar Emission for Standard Point-source Analysis of Fermi Large Area Telescope Data
Troja, E.; Caraveo, P. A.; Mirabal, N. +131 more
Most of the celestial γ rays detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope originate from the interstellar medium when energetic cosmic rays interact with interstellar nucleons and photons. Conventional point-source and extended-source studies rely on the modeling of this diffuse emission for accurate char…
Fermi GBM Observations of LIGO Gravitational-wave Event GW150914
McBreen, S.; Meegan, C. A.; McEnery, J. E. +32 more
With an instantaneous view of 70% of the sky, the Fermi Gamma-ray Burst Monitor (GBM) is an excellent partner in the search for electromagnetic counterparts to gravitational-wave (GW) events. GBM observations at the time of the Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914 reveal the presence of a weak transient above 5…
Planck 2015 results. XXII. A map of the thermal Sunyaev-Zeldovich effect
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +199 more
We have constructed all-sky Compton parameters maps, y-maps, of the thermal Sunyaev-Zeldovich (tSZ) effect by applying specifically tailored component separation algorithms to the 30 to 857 GHz frequency channel maps from the Planck satellite. These reconstructed y-maps are delivered as part of the Planck 2015 release. The y-maps are characterized…
Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +195 more
Within ten nearby (d < 450 pc) Gould belt molecular clouds we evaluate statistically the relative orientation between the magnetic field projected on the plane of sky, inferred from the polarized thermal emission of Galactic dust observed by Planck at 353 GHz, and the gas column density structures, quantified by the gradient of the column densi…
The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
Esquej, P.; Motch, C.; Ballet, J. +37 more
Context. Thanks to the large collecting area (3 ×~1500 cm2 at 1.5 keV) and wide field of view (30' across in full field mode) of the X-ray cameras on board the European Space Agency X-ray observatory XMM-Newton, each individual pointing can result in the detection of up to several hundred X-ray sources, most of which are newly discovere…
Dark energy at early times, the Hubble parameter, and the string axiverse
Kamionkowski, Marc; Karwal, Tanvi
Precise measurements of the cosmic microwave background (CMB) power spectrum are in excellent agreement with the predictions of the standard Λ CDM cosmological model. However, there is some tension between the value of the Hubble parameter H0 inferred from the CMB and that inferred from observations of the Universe at lower redshifts, a…
Discovery of Coherent Pulsations from the Ultraluminous X-Ray Source NGC 7793 P13
Harrison, F. A.; Ptak, A.; Stern, D. +12 more
We report the detection of coherent pulsations from the ultraluminous X-ray source (ULX) NGC 7793 P13. The ≈0.42 s nearly sinusoidal pulsations were initially discovered in broadband X-ray observations using XMM-Newton and NuSTAR taken in 2016. We subsequently also found pulsations in archival XMM-Newton data taken in 2013 and 2014. The significan…
Large gradual solar energetic particle events
Giacalone, Joe; Desai, Mihir
Solar energetic particles, or SEPs, from suprathermal (few keV) up to relativistic (
Reconciling Planck with the local value of H0 in extended parameter space
Di Valentino, Eleonora; Melchiorri, Alessandro; Silk, Joseph
The recent determination of the local value of the Hubble constant by Riess et al., 2016 (hereafter R16) is now 3.3 sigma higher than the value derived from the most recent CMB anisotropy data provided by the Planck satellite in a ΛCDM model. Here we perform a combined analysis of the Planck and R16 results in an extended parameter space, varying …
The MUSCLES Treasury Survey. I. Motivation and Overview
Loyd, R. O. Parke; Kowalski, Adam F.; Hawley, Suzanne L. +19 more
Ground- and space-based planet searches employing radial velocity techniques and transit photometry have detected thousands of planet-hosting stars in the Milky Way. With so many planets discovered, the next step toward identifying potentially habitable planets is atmospheric characterization. While the Sun-Earth system provides a good framework f…