Search Publications
Planck intermediate results. XXXII. The relative orientation between the magnetic field and structures traced by interstellar dust
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +201 more
The role of the magnetic field in the formation of the filamentary structures observed in the interstellar medium (ISM) is a debated topic owing to the paucity of relevant observations needed to test existing models. The Planck all-sky maps of linearly polarized emission from dust at 353 GHz provide the required combination of imaging and statisti…
Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes
Lützgendorf, Nora; Böker, Torsten; Neumayer, Nadine +2 more
Galactic nuclei typically host either a Nuclear Star Cluster (NSC, prevalent in galaxies with masses $\lesssim 10^{10}M_\odot$) or a Massive Black Hole (MBH, common in galaxies with masses $\gtrsim 10^{12}M_\odot$). In the intermediate mass range, some nuclei host both a NSC and a MBH. In this paper, we explore scaling relations between NSC mass (…
Reconciling CMB and structure growth measurements with dark energy interactions
Pourtsidou, Alkistis; Tram, Thomas
We study a coupled quintessence model with pure momentum exchange and present the effects of such an interaction on the cosmic microwave background (CMB) and matter power spectrum. For a wide range of negative values of the coupling parameter β structure growth is suppressed and the model can reconcile the tension between cosmic microwave backgrou…
Galaxy And Mass Assembly (GAMA): Panchromatic Data Release (far-UV-far-IR) and the low-z energy budget
Holwerda, Benne W.; Wilkins, Stephen M.; Conselice, Christopher J. +63 more
We present the Galaxy And Mass Assembly (GAMA) Panchromatic Data Release (PDR) constituting over 230 deg2 of imaging with photometry in 21 bands extending from the far-UV to the far-IR. These data complement our spectroscopic campaign of over 300k galaxies, and are compiled from observations with a variety of facilities including: GALax…
Evidence for dark matter interactions in cosmological precision data?
Lesgourgues, Julien; Marques-Tavares, Gustavo; Schmaltz, Martin
We study a two-parameter extension of the cosmological standard model ΛCDM in which cold dark matter interacts with a new form of dark radiation. The two parameters correspond to the energy density in the dark radiation fluid ΔNfluid and the interaction strength between dark matter and dark radiation. The interactions give rise to a ver…
A quasi-periodic modulation of the iron line centroid energy in the black hole binary H1743-322
Ingram, Adam; Done, Chris; Middleton, Matthew +5 more
Accreting stellar-mass black holes often show a `Type-C' quasi-periodic oscillation (QPO) in their X-ray flux and an iron emission line in their X-ray spectrum. The iron line is generated through continuum photons reflecting off the accretion disc, and its shape is distorted by relativistic motion of the orbiting plasma and the gravitational pull …
The primordial nucleus of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +45 more
Context. We investigate the formation and evolution of comet nuclei and other trans-Neptunian objects (TNOs) in the solar nebula and primordial disk prior to the giant planet orbit instability foreseen by the Nice model.
Aims: Our goal is to determine whether most observed comet nuclei are primordial rubble-pile survivors that formed in the s…
Q1549-C25: A Clean Source of Lyman-Continuum Emission at z = 3.15
Siana, Brian; Shapley, Alice E.; Steidel, Charles C. +5 more
We present observations of Q1549-C25, an ∼ {L}* star-forming galaxy at z = 3.15 for which Lyman-continuum (LyC) radiation is significantly detected in deep Keck/LRIS spectroscopy. We find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of Q1549-C25. Furthermo…
A radio-pulsing white dwarf binary star
Gänsicke, B. T.; Dhillon, V. S.; Pala, A. F. +23 more
White dwarfs are compact stars, similar in size to Earth but approximately 200,000 times more massive. Isolated white dwarfs emit most of their power from ultraviolet to near-infrared wavelengths, but when in close orbits with less dense stars, white dwarfs can strip material from their companions and the resulting mass transfer can generate atomi…
Refractory and semi-volatile organics at the surface of comet 67P/Churyumov-Gerasimenko: Insights from the VIRTIS/Rosetta imaging spectrometer
Fornasier, S.; Erard, S.; Drossart, P. +34 more
The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument aboard the Rosetta spacecraft has performed extensive spectral mapping of the surface of comet 67P/Churyumov-Gerasimenko in the range 0.3-5 µm. The reflectance spectra collected across the surface display a low reflectance factor over the whole spectral range, two spe…