Search Publications
Wavelet reconstruction of E and B modes for CMB polarization and cosmic shear analyses
Leistedt, Boris; Peiris, Hiranya V.; McEwen, Jason D. +1 more
We present new methods for mapping the curl-free (E-mode) and divergence-free (B-mode) components of spin 2 signals using spin directional wavelets. Our methods are equally applicable to measurements of the polarization of the cosmic microwave background (CMB) and the shear of galaxy shapes due to weak gravitational lensing. We derive pseudo- and …
High signal-to-noise spectral characterization of the planetary-mass object HD 106906 b
Fortney, Jonathan J.; Meyer, Michael R.; Quanz, Sascha P. +4 more
Context. Directly imaged planets are ideal candidates for spectroscopic characterization of their atmospheres. The angular separations that are typically close to their host stars, however, reduce the achievable contrast and thus signal-to-noise ratios (S/N).
Aims: We spectroscopically characterize the atmosphere of HD 106906 b, which is a yo…
Gas inflows towards the nucleus of the Seyfert 2 galaxy NGC 1667
Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa; Nagar, Neil M. +1 more
We use optical spectra from the inner 2 × 3 kpc2 of the Seyfert 2 galaxy NGC 1667, obtained with the Gemini Multi-Object Spectrograph integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈240 pc, to assess the feeding and feedback processes in this nearby active galactic nucleus (AGN). We have identified …
X-ray orbital modulation of a white dwarf accreting from an L dwarf. The system SDSS J121209.31+013627.7
de Martino, D.; Stelzer, B.; Wynn, G. A. +2 more
In an XMM-Newton observation of the binary SDSS J121209.31+013627.7, consisting of a white dwarf and an L dwarf, we detect X-ray orbital modulation as proof of accretion from the substellar companion onto the magnetic white dwarf. We constrain the system geometry (inclination as well as magnetic and pole-cap angle) through modelling of the X-ray l…
"TNOs are Cool": A survey of the trans-Neptunian region. XIII. Statistical analysis of multiple trans-Neptunian objects observed with Herschel Space Observatory
Lellouch, E.; Stansberry, J.; Doressoundiram, A. +3 more
Context. Gravitationally bound multiple systems provide an opportunity to estimate the mean bulk density of the objects, whereas this characteristic is not available for single objects. Being a primitive population of the outer solar system, binary and multiple trans-Neptunian objects (TNOs) provide unique information about bulk density and intern…
The stellar mass-size relation for cluster galaxies at z = 1 with high angular resolution from the Gemini/GeMS multiconjugate adaptive optics system
Glazebrook, Karl; Abraham, Roberto; Bayliss, Matthew +7 more
We present the stellar mass-size relation for 49 galaxies within the z = 1.067 cluster SPT-CL J0546-5345, with full width at half-maximum ∼80-120 mas Ks-band data from the Gemini multiconjugate adaptive optics system (GeMS/GSAOI). This is the first such measurement in a cluster environment, performed at sub-kpc resolution at rest-frame …
Simultaneous optical/X-ray study of GS 1354-64 (=BW Cir) during hard outburst: evidence for optical cyclo-synchrotron emission from the hot accretion flow
Gandhi, Poshak; Altamirano, Diego; Misra, Ranjeev +3 more
We present results from simultaneous optical [South African Large Telescope (SALT)] and X-ray (Swift and INTEGRAL) observations of GS 1354-64/BW Cir during the 2015 hard state outburst. During the rising phase, optical/X-ray time series shows a strong anti-correlation with X-ray photons lagging optical. Optical and X-ray power spectra show quasi-p…
Soft extragalactic X-ray binaries at the Eddington Threshold
Roberts, Timothy P.; Earnshaw, Hannah M.
The luminosity range at and just below the 1039 erg s-1 cut-off for defining ultraluminous X-ray sources (ULXs) is a little-explored regime. It none the less hosts a large number of X-ray sources, and has great potential for improving our understanding of sources with ∼Eddington accretion rates. We select a sample of four sou…
Listing of 502 Times When the Ulysses Magnetic Fields Instrument Observed Waves Due to Newborn Interstellar Pickup Protons
Isenberg, Philip A.; Murphy, Neil; Cannon, Bradford E. +4 more
In two earlier publications we analyzed 502 intervals of magnetic waves excited by newborn interstellar pickup protons that were observed by the Ulysses spacecraft. Due to the considerable effort required in identifying these events, we provide a list of the times for the 502 wave event intervals previously identified. In the process, we provide a…
The final year of the Rosetta mission
Ferri, Paolo; Accomazzo, Andrea; Hubault, Armelle +6 more
The International Rosetta Mission was launched on 2nd March 2004 on its 10 year journey to rendezvous with comet 67P Churyumov-Gerasimenko. Rosetta performed comet orbit insertion on the 6th of August 2014, after which it characterised the nucleus and orbited it at altitudes as low as a few kilometres. In November 2014 Rosetta delivered the lander…