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ALMA observations of 4U 1728-34 and 4U 1820-30: first detection of neutron star X-ray binaries at 300 GHz
Díaz Trigo, M.; Rahoui, F.; Russell, D. M. +3 more
We report on the first observations of neutron star low-mass X-ray binaries with the Atacama Large Millimeter/submillimeter Array (ALMA) at 300 GHz. Quasi-simultaneous observations of 4U 1728-34 and 4U 1820-30 were performed at radio (ATCA), infrared (VLT) and X-ray (Swift) frequencies, spanning more than eight decades in frequency coverage. Both …
Evidence for distributed gas sources of hydrogen halides in the coma of comet 67P/Churyumov-Gerasimenko
Neefs, Eddy; Mall, Urs; De Keyser, Johan +24 more
Rosetta has detected the presence of the hydrogen halides HF, HCl, and HBr in the coma of comet 67P/Churyumov-Gerasimenko. These species are known to freeze out on icy grains in molecular clouds. Analysis of the abundances of HF and HCl as a function of cometocentric distance suggests that these hydrogen halides are released both from the nucleus …
CLUMP-3D: three-dimensional lensing and multi-probe analysis of MACS J1206.2-0847, a remarkably regular cluster
Zitrin, Adi; Umetsu, Keiichi; Meneghetti, Massimo +5 more
Multi-wavelength techniques can probe the distribution and the physical properties of baryons and dark matter in galaxy clusters from the inner regions out to the peripheries. We present a full three-dimensional analysis combining strong and weak lensing, X-ray surface brightness and temperature, and the Sunyaev-Zel'dovich effect. The method is ap…
Atmospheric tides in Earth-like planets
Mathis, S.; Laskar, J.; Auclair-Desrotour, P.
Context. Atmospheric tides can strongly affect the rotational dynamics of planets. In the family of Earth-like planets, which includes Venus, this physical mechanism coupled with solid tides makes the angular velocity evolve over long timescales and determines the equilibrium configurations of their spin.
Aims: Unlike the solid core, the atmo…
Origin and Ion Charge State Evolution of Solar Wind Transients during 4 - 7 August 2011
Slemzin, V.; Goryaev, F.; Pagano, P. +5 more
We present a study of the complex event consisting of several solar wind transients detected by the Advanced Composition Explorer (ACE) on 4 - 7 August 2011, which caused a geomagnetic storm with Dst =−110 nT. The supposed coronal sources, three flares and coronal mass ejections (CMEs), occurred on 2 - 4 August 2011 in active region (AR) 11261. To…
ALMA Observations of the Interaction of a Radio Jet with Molecular Gas in Minkowski's Object
Nyland, Kristina; Lacy, Mark; Croft, Steve +2 more
We use the Atacama Large Millimeter Array (ALMA) to detect and image CO (1-0) emission from Minkowski’s Object, a dwarf galaxy in the cluster Abell 194 that is interacting with a radio jet from a nearby elliptical galaxy. The ALMA observations, which are the first to detect molecular gas in Minkowski’s Object, also image the high-frequency continu…
Impact of a cometary outburst on its ionosphere. Rosetta Plasma Consortium observations of the outburst exhibited by comet 67P/Churyumov-Gerasimenko on 19 February 2016
Altwegg, K.; Tsurutani, B. T.; Nilsson, H. +15 more
We present a detailed study of the cometary ionospheric response to a cometary brightness outburst using in situ measurements for the first time. The comet 67P/Churyumov-Gerasimenko (67P) at a heliocentric distance of 2.4 AU from the Sun, exhibited an outburst at ~1000 UT on 19 February 2016, characterized by an increase in the coma surface bright…
Origin of warm and hot gas emission from low-mass protostars: Herschel-HIFI observations of CO J = 16-15. I. Line profiles, physical conditions, and H2O abundance
Maret, S.; van Dishoeck, E. F.; Evans, N. J. +18 more
Context. Through spectrally unresolved observations of high-J CO transitions, Herschel Photodetector Array Camera and Spectrometer (PACS) has revealed large reservoirs of warm (300 K) and hot (700 K) molecular gas around low-mass protostars. The excitation and physical origin of this gas is still not understood.
Aims: We aim to shed light on …
A Potential Recoiling Supermassive Black Hole, CXO J101527.2+625911
Kim, D. -C.; Kim, Ji Hoon; Privon, G. C. +4 more
We have carried out a systematic search for recoiling supermassive black holes (rSMBH) using the Chandra Source and SDSS Cross-Match Catalog. From the survey, we have detected a potential rSMBH, CXO J101527.2+625911, at z = 0.3504. The source CXO J101527.2+625911 has a spatially offset (1.26 ± 0.05 kpc) active SMBH and kinematically offset broad e…
Characteristics that Produce White-light Enhancements in Solar Flares Observed by Hinode/SOT
Masuda, Satoshi; Watanabe, Kyoko; Kitagawa, Jun
To understand the conditions that produce white-light (WL) enhancements in solar flares, a statistical analysis of visible continuum data as observed by Hinode/Solar Optical Telescope (SOT) was performed. In this study, approximately 100 flare events from M- and X-class flares were selected. The time period during which the data were recorded span…