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No New Cosmological Concordance with Massive Sterile Neutrinos
Leistedt, Boris; Peiris, Hiranya V.; Verde, Licia
It has been claimed recently that massive sterile neutrinos could bring about a new concordance between observations of the cosmic microwave background, the large-scale structure of the Universe, and local measurements of the Hubble constant, H0. We demonstrate that this apparent concordance results from combining data sets which are in…
3XMM J185246.6+003317: Another Low Magnetic Field Magnetar
Rea, N.; Torres, D. F.; Israel, G. L. +2 more
We study the outburst of the newly discovered X-ray transient 3XMM J185246.6+003317, re-analyzing all available XMM-Newton observations of the source to perform a phase-coherent timing analysis, and derive updated values of the period and period derivative. We find the source rotating at P = 11.55871346(6) s (90% confidence level; at epoch MJD 547…
Planck 2013 results. XXXI. Consistency of the Planck data
Miville-Deschênes, M. -A.; Bernard, J. -P.; Planck Collaboration +181 more
The Planck design and scanning strategy provide many levels of redundancy that can be exploited to provide tests of internal consistency. One of the most important is the comparison of the 70 GHz (amplifier) and 100 GHz (bolometer) channels. Based on different instrument technologies, with feeds located differently in the focal plane, analysed ind…
A Survey of the Molecular ISM Properties of Nearby Galaxies Using the Herschel FTS
Conley, A.; Glenn, J.; Kamenetzky, J. +2 more
The 12CO J = 4 → 3 to J = 13 → 12 lines of the interstellar medium from nearby galaxies, newly observable with the Herschel SPIRE Fourier transform spectrometer, offer an opportunity to study warmer, more luminous molecular gas than that traced by 12CO J = 1 → 0. Here we present a survey of 17 nearby infrared-luminous galaxy …
A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds: First Results
Massey, Philip; Hillier, D. John; Morrell, Nidia +1 more
Over the years, directed surveys and incidental spectroscopy have identified 12 Wolf-Rayet (WR) stars in the Small Magellanic Cloud (SMC) and 139 in the Large Magellanic Cloud (LMC), numbers which are often described as "essentially complete." Yet, new WRs are discovered in the LMC almost yearly. We have therefore initiated a new survey of both Ma…
Where do Galaxies End?
Shull, J. Michael
Our current view of galaxies considers them as systems of stars and gas embedded in extended halos of dark matter, much of it formed by the infall of smaller systems at earlier times. The true extent of a galaxy remains poorly determined, with the "virial radius" (R vir) providing a characteristic separation between collapsed structures…
X-ray monitoring of classical novae in the central region of M 31 III. Autumn and winter 2009/10, 2010/11, and 2011/12
Della Valle, M.; Pietsch, W.; Haberl, F. +7 more
Context. Classical novae (CNe) represent the major class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31.
Aims: We performed a dedicated monitoring of the M 31 central region, which aimed to detect SSS counterparts of CNe, with XMM-Newton and Chandra between Nov. and Mar. of the years 2009/10, 2010/11, …
Planck 2013 results. V. LFI calibration
Bernard, J. -P.; Planck Collaboration; Aghanim, N. +217 more
We discuss the methods employed to photometrically calibrate the data acquired by the Low Frequency Instrument on Planck. Our calibration is based on a combination of the orbital dipole plus the solar dipole, caused respectively by the motion of the Planck spacecraft with respect to the Sun and by motion of the solar system with respect to the cos…
The formation of stellar nuclear discs in bar-induced gas inflows
Debattista, Victor P.; Erwin, Peter; Earp, Samuel W. F. +2 more
The role of gas in the mass assembly at the nuclei of galaxies is still subject to some uncertainty. Stellar nuclear discs bridge the gap between the large-scale galaxy and the central massive objects that reside there. Using a high-resolution simulation of a galaxy forming out of gas cooling and settling into a disc, we study the formation and pr…
Combining Planck data with large scale structure information gives a strong neutrino mass constraint
Riemer-Sørensen, Signe; Davis, Tamara M.; Parkinson, David
We present the strongest current cosmological upper limit on the neutrino mass of ∑mν<0.18 eV (95% confidence). It is obtained by adding observations of the large-scale matter power spectrum from the WiggleZ Dark Energy Survey to observations of the cosmic microwave background data from the Planck surveyor, and measurements of the ba…