Search Publications
Probing Oort Clouds around Milky Way Stars with CMB Surveys
Jain, Bhuvnesh; Blake, Cullen H.; Baxter, Eric J.
Long-period comets observed in our solar system are believed to originate from the Oort cloud, which is estimated to extend from roughly a few thousand to 105 au from the Sun. Despite many theoretical arguments for the existence of the Oort cloud, no direct observations of outer Oort cloud objects have been reported. Here, we explore th…
The XXL Survey: XXIII. The Mass Scale of XXL Clusters from Ensemble Spectroscopy
Valtchanov, Ivan; Driver, Simon P.; Rapetti, David +34 more
Context. An X-ray survey with the XMM-Newton telescope, XMM-XXL, has identified hundreds of galaxy groups and clusters in two 25 deg2 fields. Combining spectroscopic and X-ray observations in one field, we determine how the kinetic energy of galaxies scales with hot gas temperature and also, by imposing prior constraints on the relative…
Mapping spiral waves and other radial features in Saturn's rings
Tiscareno, Matthew S.; Harris, Brent E.
We have analyzed the highest-quality images to be obtained by Cassini of Saturn's main rings after the Saturn Orbit Insertion (SOI) and before the Ring Grazing Orbits (RGO) and Grand Finale (GF). These images are comparable to those of SOI in fidelity, though not in nominal resolution, due to their high signal-to-noise. We have systematically sear…
Circumnuclear star formation in Mrk 42 mapped with Gemini Near-infrared Integral Field Spectrograph
Colina, Luis; Storchi-Bergmann, Thaisa; Riffel, Rogemar A. +3 more
We present Gemini Near-infrared Integral Field Spectrograph (NIFS) observations of the inner 1.5 × 1.5 kpc2 of the narrow-line Seyfert 1 galaxy Mrk 42 at a spatial resolution of 60 pc and spectral resolution of 40 km s^{-1}. The emission-line flux and equivalent width maps clearly show a ring of circumnuclear star formation regions surr…
A low-mass eclipsing binary within the fully convective zone from the Next Generation Transit Survey
Bouchy, F.; Queloz, D.; Smith, A. M. S. +22 more
We have discovered a new, near-equal-mass, eclipsing M dwarf binary from the Next Generation Transit Survey. This system is only one of three field-age (>1 Gyr), late M dwarf eclipsing binaries known, and has a period of 1.74774 d, similar to that of CM Dra and KOI126. Modelling of the eclipses and radial velocities shows that the component mas…
DePhine - The Deimos and Phobos Interior Explorer
Willner, Konrad; Oberst, Jürgen; Pätzold, Martin +15 more
DePhine - Deimos and Phobos Interior Explorer - is a mission proposed in the context of ESA's Cosmic Vision program, for launch in 2030. The mission will explore the origin and the evolution of the two Martian satellites, by focusing on their interior structures and diversity, by addressing the following open questions: Are Phobos and Deimos true …
Where is the Engine Hiding Its Missing Energy? Constraints from a Deep X-Ray Non-detection of the Superluminous SN 2015bn
Berger, Edo; Chornock, Ryan; Margutti, Raffaella +5 more
SN 2015bn is a nearby hydrogen-poor superluminous supernova (SLSN-I) that has been intensively observed in X-rays with the goal to detect the spindown powered emission from a magnetar engine. The early-time ultraviolet/optical/infrared (UVOIR) data fit well to the magnetar model, but require leakage of energy at late times of ≲1043 erg …
Low-Frequency Quasi-Periodic Oscillations in the X-ray Nova MAXI J1535-571 at the Initial Stage of Its 2017 Outburst
Grebenev, S. A.; Mereminskiy, I. A.; Semena, A. N. +1 more
We report the discovery of low-frequency quasi-periodic oscillations (QPOs) in the power spectrum of the X-ray nova MAXI J1535-571 at the initial stage of its outburst in September 2017. Based on data from the SWIFT and INTEGRAL instruments, we have traced the evolution of the QPO parameters (primarily their frequency) with time and their correlat…
The coordinated radio and infrared survey for high-mass star formation - IV. A new radio-selected sample of compact galactic planetary nebulae
Umana, G.; Lumsden, S. L.; Zijlstra, A. A. +6 more
We present a new radio-selected sample of PNe from the CORNISH survey. This is a radio continuum survey of the inner Galactic plane covering Galactic longitude, 10° < l < 65° and latitude, |b| < 1° with a resolution of 1.5 arcsec and sensitivity better than 0.4 mJy beam-1. The radio regime, being unbiased by dust extinction, al…
Extended ammonia observations towards the integral-shaped filament
Qiu, Keping; Li, Dalei; Wu, Gang +4 more
Context. Recent observations suggest a scenario in which filamentary structures in the interstellar medium represent the first step towards clumps/cores and eventually star formation. The densest filaments would then fragment into prestellar cores owing to gravitational instability.
Aims: We seek to understand the roles filamentary structures…