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Cosmic troublemakers: the Cold Spot, the Eridanus supervoid, and the Great Walls
García-Bellido, Juan; Kovács, András
The alignment of the CMB Cold Spot and the Eridanus supervoid suggests a physical connection between these two relatively rare objects. We use galaxy catalogues with photometric (2MPZ) and spectroscopic (6dF) redshift measurements, supplemented by low-redshift compilations of cosmic voids, in order to improve the 3D mapping of the matter density i…
Planck intermediate results. XXXVI. Optical identification and redshifts of Planck SZ sources with telescopes at the Canary Islands observatories
Böhringer, H.; Kneissl, R.; Dahle, H. +188 more
We present the results of approximately three years of observations of Planck Sunyaev-Zeldovich (SZ) sources with telescopes at the Canary Islands observatories as part of the general optical follow-up programme undertaken by the Planck Collaboration. In total, 78 SZ sources are discussed. Deep-imaging observations were obtained for most of these …
Information gain on reheating: The one bit milestone
Ringeval, Christophe; Martin, Jérôme; Vennin, Vincent
We show that the Planck 2015 and BICEP2/KECK measurements of the cosmic microwave background (CMB) anisotropies provide together an information gain of 0.82 ±0.13 bits on the reheating history over all slow-roll single-field models of inflation. This corresponds to a 40% improvement compared to the Planck 2013 constraints on the reheating. Our met…
Titan's "Magic Islands": Transient features in a hydrocarbon sea
Soderblom, Jason M.; Lorenz, Ralph D.; Malaska, Michael J. +6 more
The region of Titan's hydrocarbon sea, Ligeia Mare, where transient bright features were previously discovered, was anomalously bright in the first of two more recent Cassini RADAR observations but not the second. Another transient bright feature in a different region of Ligeia Mare was also discovered in the first of the new observations. Here we…
The prevalence of star formation as a function of Galactocentric radius
Moore, T. J. T.; Elia, D.; Molinari, S. +3 more
We present large-scale trends in the distribution of star-forming objects revealed by the Hi-GAL survey. As a simple metric probing the prevalence of star formation in Hi-GAL sources, we define the fraction of the total number of Hi-GAL sources with a 70 µm counterpart as the `star-forming fraction' or SFF. The mean SFF in the inner galactic…
Correlated X-ray/ultraviolet/optical variability in NGC 6814
Horne, Keith; Goad, Michael R.; Cackett, Edward M. +4 more
We present results of a three-month combined X-ray/UV/optical monitoring campaign of the Seyfert 1 galaxy NGC 6814. The object was monitored by Swift from June through August 2012 in the X-ray and UV bands and by the Liverpool Telescope from May through July 2012 in B and V. The light curves are variable and significantly correlated between waveba…
Chandra Observations of Outflows from PSR J1509-5850
Pavlov, George G.; Kargaltsev, Oleg; Klingler, Noel +3 more
PSR J1509-5850 is a middle-aged pulsar with a period of P ≈ 89 ms and spin-down power of \dot{E}=5.1× {10}35 erg s-1, at a distance of about 3.8 kpc. We report on deep Chandra X-ray Observatory observations of this pulsar and its pulsar wind nebula (PWN). In addition to the previously detected tail extending up to 7‧ southwes…
The global surface composition of 67P/Churyumov-Gerasimenko nucleus by Rosetta/VIRTIS. II) Diurnal and seasonal variability
Mottola, S.; Barucci, M. A.; Ip, W. -H. +24 more
VIRTIS-M observations of the nucleus of comet 67P/Churyumov-Gerasimenko acquired from 2014 August to 2015 May have been analysed to investigate surface temporal variability at both seasonal and diurnal scales. The measured reflectance spectra are studied by means of comet spectral indicators (CSI) such as slopes in the visible and infrared ranges,…
High-speed Bullet Ejections during the AGB-to-Planetary Nebula Transition: HST Observations of the Carbon Star, V Hydrae
Sahai, R.; Morris, M. R.; Scibelli, S.
The well-studied carbon star, V Hya, showing evidence for high-speed, collimated outflows and dense equatorial structures, is a key object in the study of the poorly understood transition of AGB stars into aspherical planetary nebulae. Using the Space Telescope Imaging Spectrograph instrument on board the Hubble Space Telescope, we have obtained h…
Structure of Prominence Legs: Plasma and Magnetic Field
Schmieder, B.; Labrosse, N.; López Ariste, A. +1 more
We investigate the properties of a “solar tornado” observed on 2014 July 15, and aim to link the behavior of the plasma to the internal magnetic field structure of the associated prominence. We made multi-wavelength observations with high spatial resolution and high cadence using SDO/AIA, the Interface Region Imaging Spectrograph (IRIS) spectrogra…