Search Publications
Spatial deconvolution of spectropolarimetric data: an application to quiet Sun magnetic elements
Ruiz Cobo, B.; Quintero Noda, C.; Orozco Suárez, D. +1 more
Context. One of the difficulties in extracting reliable information about the thermodynamical and magnetic properties of solar plasmas from spectropolarimetric observations is the presence of light dispersed inside the instruments, known as stray light.
Aims: We aim to analyze quiet Sun observations after the spatial deconvolution of the data…
Unusual A2142 supercluster with a collapsing core: distribution of light and mass
Park, Changbom; Nevalainen, Jukka; Tempel, Elmo +6 more
Context. Superclusters of galaxies can be used to test cosmological models of the formation and evolution of the largest structures in the cosmic web, and of galaxy and cluster evolution in superclusters.
Aims: We study the distribution, masses, and dynamical properties of galaxy groups in the A2142 supercluster.
Methods: We analyse the …
First New Solar Models with OPAS Opacity Tables
Salmon, S.; Turck-Chièze, S.; Le Pennec, M. +4 more
Stellar seismology appears more and more as a powerful tool for a better determination of the fundamental properties of solar-type stars. However, the particular case of the Sun is still challenging. For about a decade now, the helioseismic sound-speed determination has continued to disagree with the standard solar model (SSM) prediction, question…
Non-local bias in the halo bispectrum with primordial non-Gaussianity
Ross, Ashley J.; Tasinato, Gianmassimo; Wands, David +1 more
Primordial non-Gaussianity can lead to a scale-dependent bias in the density of collapsed halos relative to the underlying matter density. The galaxy power spectrum already provides constraints on local-type primordial non-Gaussianity complementary those from the cosmic microwave background (CMB), while the bispectrum contains additional shape inf…
Band-9 ALMA Observations of the [N II] 122 µm Line and FIR Continuum in Two High-z galaxies.
Sheth, Kartik; Falgarone, Edith; Nikola, Thomas +4 more
We present Atacama Large Millimeter Array (ALMA) observations of two high-redshift systems (SMMJ02399-0136 at z 1 ∼ 2.8 and the Cloverleaf QSO at z 1 ∼ 2.5) in their rest-frame 122 µm continuum (ν sky ∼ 650 GHz, λ sky ∼ 450 µm) and [N ii] 122 µm line emission. The continuum observations…
X-ray time lags and non-linear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1
Vaughan, S.; Roberts, T. P.; Middleton, M. +1 more
We present our analysis of the X-ray variability of two ultraluminous X-ray sources (ULXs) based on multiple XMM-Newton observations. We show that the linear rms-flux relation is present in eight observations of NGC 5408 X-1 and also in three observations of NGC 6946 X-1, but data from other ULXs are generally not sufficient to constrain any rms-f…
Characterizing extragalactic anomalous microwave emission in NGC 6946 with CARMA
Hensley, Brandon; Murphy, Eric; Staguhn, Johannes
Using 1 cm and 3 mm observations from the Combined Array for Research in Millimeter-wave Astronomy and 2 mm observations from the Goddard IRAM Superconducting 2 Millimeter Observer observations, we follow up the first extragalactic detection of anomalous microwave emission (AME) reported by Murphy et al. in an extranuclear region (Enuc. 4) of the …
Compositional provinces of Mars from statistical analyses of TES, GRS, OMEGA and CRISM data
Rogers, A. Deanne; Hamilton, Victoria E.
identified 10 distinct classes of mineral assemblage on Mars through statistical analyses of mineral abundances derived from Mars Global Surveyor Thermal Emission Spectrometer (TES) data at a spatial resolution of 8 pixels per degree. Two classes are new regions in Sinus Meridiani and northern Hellas basin. Except for crystalline hematite abundanc…
Asteroid lightcurve inversion with Lommel-Seeliger ellipsoids
Muinonen, Karri; Wilkman, Olli; Cellino, Alberto +2 more
We derive initial rotation, shape, and scattering properties for asteroids from sparse and dense photometry based on the so-called Lommel-Seeliger ellipsoid (LS ellipsoid). Due to the analytical disk-integrated brightness, the LS ellipsoid allows for fast rotation-period, pole-orientation, and shape analyses, as well as efficient Markov-chain Mont…
Dissecting galactic bulges in space and time - I. The importance of early formation scenarios versus secular evolution
Seidel, M. K.; Falcón-Barroso, J.; Vogt, F. P. A. +7 more
The details of bulge formation via collapse, mergers, secular processes or their interplay remain unresolved. To start answering this question and quantify the importance of distinct mechanisms, we mapped a sample of three galactic bulges using data from the integral field spectrograph WiFeS on the ANU's 2.3-m telescope in Siding Spring Observator…