Search Publications
High-precision optical polarimetry of the accreting black hole V404 Cyg during the 2015 June outburst
Miles-Páez, Paulo A.; Piirola, Vilppu; Tsygankov, Sergey S. +4 more
Our simultaneous three-colour (BVR) polarimetric observations of the low-mass black hole X-ray binary V404 Cyg show a small but statistically significant change of polarization degree (Δp ∼ 1 per cent) between the outburst in 2015 June and the quiescence. The polarization of V404 Cyg in the quiescent state agrees within the errors with that of the…
Constrains on Kähler moduli inflation from reheating
Bhattacharya, Sukannya; Dutta, Koushik; Maharana, Anshuman
We present predictions of the Kähler moduli inflation model for the spectral tilt by parametrizing the reheating epoch by an effective equation-of-state parameter and the number of e-foldings of reheating; and taking into account the post-inflationary history of the model. This model has an epoch in which the energy density of the universe is domi…
Hubble Space Telescope Scattered-light Imaging and Modeling of the Edge-on Protoplanetary Disk ESO-Hα 569
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
We present new Hubble Space Telescope (HST) Advanced Camera for Surveys observations and detailed models for a recently discovered edge-on protoplanetary disk around ESO-Hα 569 (a low-mass T Tauri star in the Cha I star-forming region). Using radiative transfer models, we probe the distribution of the grains and overall shape of the disk (inclinat…
Polygonal ridge networks on Mars: Diversity of morphologies and the special case of the Eastern Medusae Fossae Formation
Head, James W.; Kerber, Laura; Dickson, James L. +1 more
Polygonal ridge networks, also known as boxwork or reticulate ridges, are found in numerous locations and geological contexts across Mars. Distinguishing the morphologies and geological context of the ridge networks sheds light on their potential as astrobiological and mineral resource sites of interest. The most widespread type of ridge morpholog…
Different Accretion Heating of the Neutron Star Crust during Multiple Outbursts in MAXI J0556-332
Homan, Jeroen; Miller, Jon M.; Fridriksson, Joel K. +12 more
The transient neutron star (NS) low-mass X-ray binary MAXI J0556-332 provides a rare opportunity to study NS crust heating and subsequent cooling for multiple outbursts of the same source. We examine MAXI, Swift, Chandra, and XMM-Newton data of MAXI J0556-332 obtained during and after three accretion outbursts of different durations and brightness…
Inferring the photometric and size evolution of galaxies from image simulations. I. Method
Bertin, Emmanuel; Le Borgne, Damien; Carassou, Sébastien +1 more
Context. Current constraints on models of galaxy evolution rely on morphometric catalogs extracted from multi-band photometric surveys. However, these catalogs are altered by selection effects that are difficult to model, that correlate in non trivial ways, and that can lead to contradictory predictions if not taken into account carefully.
Ai…
Galaxy evolution in merging clusters: The passive core of the "Train Wreck" cluster of galaxies, A 520
Park, Byeong-Gon; Hwang, Narae; Hwang, Ho Seong +9 more
Aims: The mergers of galaxy clusters are the most energetic events in the Universe after the Big Bang. With the increased availability of multi-object spectroscopy and X-ray data, an ever increasing fraction of local clusters are recognised as exhibiting signs of recent or past merging events on various scales. Our goal is to probe how these …
An ALMA survey of submillimetre galaxies in the COSMOS field: The extent of the radio-emitting region revealed by 3 GHz imaging with the Very Large Array
Bondi, M.; Magnelli, B.; Aussel, H. +32 more
Context. The observed spatial scale of the radio continuum emission from star-forming galaxies can be used to investigate the spatial extent of active star formation, constrain the importance of cosmic-ray transport, and examine the effects of galaxy interactions.
Aims: We determine the radio size distribution of a large sample of 152 submill…
Constraints on Io's interior from auroral spot oscillations
Saur, Joachim; Roth, Lorenz; Feldman, Paul D. +3 more
The morphology of Io's aurora is dominated by bright spots near the equator that oscillate up and down in approximate correlation with the oscillating orientation of the Jovian magnetospheric field. Analyzing Hubble Space Telescope images, we find that the auroral spots oscillate in phase with the time-variable Jovian magnetic field at Io and that…
An atlas of exotic variability in IGR J17091-3624: a comparison with GRS 1915+105
Court, J. M. C.; Altamirano, D.; Belloni, T. +5 more
We performed an analysis of all Rossi X-ray Timing Explorer observations of the low-mass X-ray binary (LMXB) and black hole candidate IGR J17091-3624 during the 2011-2013 outburst of the source. By creating light curves, hardness-intensity diagrams and power density spectra of each observation, we have created a set of nine variability 'classes' t…