Search Publications
Chandra and XMM monitoring of the black hole X-ray binary IC 10 X-1
Laycock, Silas G. T.; Cappallo, Rigel C.; Moro, Matthew J.
The massive black hole (BH)+Wolf-Rayet (WR) binary IC 10 X-1 was observed in a series of 10 Chandra and two XMM-Newton observations spanning 2003-2012, showing consistent variability around 7 × 1037 erg s-1, with a spectral hardening event in 2009. We phase connected the entire light curve by folding the photon arrival times …
Radio haloes in Sunyaev-Zel'dovich-selected clusters of galaxies: the making of a halo?
Sommer, M.; Cassano, R.; Vazza, F. +8 more
Radio haloes are synchrotron radio sources detected in some massive galaxy clusters. Their size of Mpc indicates that (re)acceleration processes are taking place in the host cluster. X-ray catalogues of galaxy clusters have been used in the past to search for radio haloes and to understand their connection with cluster-cluster mergers and with the…
Resolved Millimeter Emission from the HD 15115 Debris Disk
MacGregor, Meredith A.; Hughes, A. Meredith; Wilner, David J. +1 more
We have used the Submillimeter Array (SMA) to make 1.3 mm observations of the debris disk surrounding HD 15115, an F-type star with a putative membership in the β Pictoris moving group. This nearly edge-on debris disk shows an extreme asymmetry in optical scattered light, with an extent almost two times larger to the west of the star than to the e…
The Mg i line: a new probe of the atmospheres of evaporating exoplanets
Lecavelier des Etangs, A.; Bourrier, V.; Vidal-Madjar, A.
Transit observations of HD 209458b in the UV revealed signatures of neutral magnesium escaping the planet's upper atmosphere. The absorption detected in the Mg i line provides unprecedented information on the physical conditions at the altitude where the atmospheric blow-off takes place. Here we use a 3D model of atmospheric escape to estimate the…
Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability. III. The Central Star of Abell 65
Bond, Howard E.; Jones, David; De Marco, Orsola +4 more
A growing number of close binary stars are being discovered among central stars of planetary nebulae. Recent and ongoing surveys are finding new systems and contributing to our knowledge of the evolution of close binary systems. The push to find more systems was largely based on early discoveries which suggested that 10%-15% of all central stars a…
Exploring the Intrabinary Shock from the Redback Millisecond Pulsar PSR J2129-0429
Cheng, K. S.; Takata, J.; Kong, A. K. H. +7 more
We have investigated the intrabinary shock emission from the redback millisecond pulsar PSR J2129-0429 with XMM-Newton and Fermi. Orbital modulation in X-ray and UV can be clearly seen. The X-ray modulation of this pulsar has a double-peaked structure with a dip in between. The observed X-rays are non-thermal dominant and can be modeled by a power…
A neural-network based estimator to search for primordial non-Gaussianity in Planck CMB maps
Wuensche, C. A.; Novaes, C. P.; Bernui, A. +1 more
We present an upgraded combined estimator, based on Minkowski Functionals and Neural Networks, with excellent performance in detecting primordial non-Gaussianity in simulated maps that also contain a weighted mixture of Galactic contaminations, besides real pixel's noise from Planck cosmic microwave background radiation data. We rigorously test th…
Time delay of interplanetary magnetic field penetration into Earth's magnetotail
Petrukovich, A. A.; Wei, Y.; Zhang, T. L. +6 more
Many previous studies have demonstrated that the interplanetary magnetic field (IMF) can control the magnetospheric dynamics. Immediate magnetospheric responses to the external IMF have been assumed for a long time. The specific processes by which IMF penetrates into magnetosphere, however, are actually unclear. Solving this issue will help to acc…
ALMA detection of [C ii] 158 µm emission from a strongly lensed z = 2.013 star-forming galaxy
Schaerer, D.; Jones, T.; Dessauges-Zavadsky, M. +9 more
Aims: Our objectives are to determine the properties of the interstellar medium (ISM) and of star formation in typical star-forming galaxies at high redshift.
Methods: Following up on our previous multi-wavelength observations with HST, Spitzer, Herschel, and the Plateau de Bure Interferometer (PdBI), we have studied a strongly lensed z …
Indications of R-mode Oscillations in SOHO/MDI Solar Radius Measurements
Scargle, J. D.; Gough, D. O.; Sturrock, P. A. +1 more
Analysis of solar radius measurements acquired by the Michelson Doppler Imager on the Solar and Heliospheric Observatory spacecraft supports previously reported evidence of solar internal r-mode oscillations in Mt Wilson radius data and in 90Sr beta-decay data. The frequencies of these oscillations are compatible with oscillations in a …