Search Publications
A mid-IR interferometric survey with MIDI/VLTI: resolving the second-generation protoplanetary disks around post-AGB binaries
Waters, L. B. F. M.; Debosscher, J.; de Wit, W. -J. +7 more
Aims: We present a mid-IR interferometric survey of the circumstellar environment of a specific class of post-asymptotic giant branch (post-AGB) binaries. For this class the presence of a compact dusty disk has been postulated on the basis of various spatially unresolved measurements. The aim is to determine the angular extent of the N-band e…
The circumstellar envelope around the S-type AGB star W Aql. Effects of an eccentric binary orbit
Lindqvist, M.; Olofsson, H.; De Beck, E. +9 more
Context. Recent observations at subarcsecond resolution, now possible also at submillimeter wavelengths, have shown intricate circumstellar structures around asymptotic giant branch (AGB) stars, mostly attributed to binary interaction. The results presented here are part of a larger project aimed at investigating the effects of a binary companion …
η Carinae's Dusty Homunculus Nebula from Near-infrared to Submillimeter Wavelengths: Mass, Composition, and Evidence for Fading Opacity
Hillier, D. John; Gull, Theodore R.; Nielsen, Krister +5 more
Infrared observations of the dusty, massive Homunculus Nebula around the luminous blue variable η Carinae are crucial to characterize the mass-loss history and help constrain the mechanisms leading to the great eruption. We present the 2.4-670 µm spectral energy distribution, constructed from legacy Infrared Space Observatory observations an…
AGN Coronae through a Jet Perspective
Kara, Erin; Lohfink, Anne; King, Ashley L.
This paper presents an in-depth look at the jet and coronal properties of 41 active galactic nuclei (AGNs). Utilizing the highest quality NuSTAR, XMM-Newton, and NRAO VLA Sky Survey 1.4 GHz data, we find that the radio Eddington luminosity inversely scales with X-ray reflection fraction, and positively scales with the distance between the corona a…
Measurement of CIB power spectra over large sky areas from Planck HFI maps
Lagache, Guilaine; Mak, Daisy Suet Ying; Challinor, Anthony +1 more
We present new measurements of the power spectra of the cosmic infrared background (CIB) anisotropies using the Planck 2015 full-mission High frequency instrument data at 353, 545 and 857 GHz over 20 000 deg2. We use techniques similar to those applied for the cosmological analysis of Planck, subtracting dust emission at the power spect…
On the Dawn-Dusk Asymmetry of the Kelvin-Helmholtz Instability Between 2007 and 2013
Nykyri, K.; Moore, T. W.; Dimmock, A. P. +2 more
Using data from Time History of Events and Macroscale Interactions during Substorms (THEMIS), a statistical study was performed to determine whether a dawn-dusk asymmetry exists in the occurrence rates of the Kelvin-Helmholtz instability during Parker-Spiral (PS) and Ortho-Parker-Spiral (OPS) orientations of the interplanetary magnetic field (IMF)…
Non-parametric deprojection of NIKA SZ observations: Pressure distribution in the Planck-discovered cluster PSZ1 G045.85+57.71
Adam, R.; Arnaud, M.; Benoît, A. +38 more
The determination of the thermodynamic properties of clusters of galaxies at intermediate and high redshift can bring new insights into the formation of large-scale structures. It is essential for a robust calibration of the mass-observable scaling relations and their scatter, which are key ingredients for precise cosmology using cluster statistic…
Extending the Calibration of C IV-based Single-epoch Black Hole Mass Estimators for Active Galactic Nuclei
Treu, Tommaso; Barth, Aaron J.; Assef, Roberto J. +5 more
We provide an updated calibration of C IV λ 1549 broad emission line-based single-epoch (SE) black hole (BH) mass estimators for active galactic nuclei (AGNs) using new data for six reverberation-mapped AGNs at redshift z=0.005{--}0.028 with BH masses (bolometric luminosities) in the range {10}6.5{--}{10}7.5 {M}⊙ …
Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808
Sanna, A.; Rea, N.; Ferrigno, C. +6 more
We report on the discovery of coherent pulsations at a period of 2.9 ms from the X-ray transient MAXI J0911-655 in the globular cluster NGC 2808. We observed X-ray pulsations at a frequency of 339.97 Hz in three different observations of the source performed with XMM-Newton and NuSTAR during the source outburst. This newly discovered accreting mil…
A 1D Model of Radial Ion Motion Interrupted by Ion-Neutral Interactions in a Cometary Coma
Vigren, E.; Eriksson, A. I.
Because ion-neutral reaction cross sections are energy dependent, the distance from a cometary nucleus within which ions remain collisionally coupled to the neutrals is dictated not only by the comet’s activity level but also by the electromagnetic fields in the coma. Here we present a 1D model simulating the outward radial motion of water group i…