Search Publications
A search for z= 7.3 Lyα emitters behind gravitationally lensing clusters
Richard, Johan; Shibuya, Takatoshi; Egami, Eiichi +3 more
We searched for z= 7.3 Lyα emitters (LAEs) behind two gravitationally lensing clusters, Abell 2390 and CL 0024, using the Subaru Telescope Suprime-Cam and a narrow-band filter NB1006 (λc∼ 1005 nm and full width at half-maximum of about 21 nm). The combination of the fully depleted CCDs of the Suprime-Cam, sensitive to z∼ 7 Lyα emission …
Overlapping ion structures in the mid-altitude cusp under northward IMF: signature of dual lobe reconnection?
Berchem, J.; Escoubet, C. P.; Pitout, F. +2 more
On some rare occasions, data from the Cluster Ion Spectrometer (CIS) in the mid-altitude cusp reveal overlapping ion populations under northward interplanetary magnetic field (IMF). While the poleward part of the cusp exhibits the expected reverse dispersion due to lobe reconnection, its equatorward part shows a second ion population at higher-ene…
Stellar subsystems of different ages in spiral and irregular galaxies
Tikhonov, N. A.; Galazutdinova, O. A.
Based on archival Hubble Space Telescope images, we have performed stellar photometry for eight edge-on spiral and irregular galaxies. We have identified stars of three ages in the derived Hertzsprung-Russell diagrams and constructed their number density distribution perpendicularly to the plane of the galactic disk. The sizes of the stellar subsy…
Asymmetry of Hard X-Ray Emissions at Conjugate Footpoints in Solar Flares
Krucker, Säm; Cheng, C. Z.; Yang, Ya-Hui +2 more
The chromospheric double hard X-ray (HXR) sources generally appear at the conjugate footpoints of flaring loops with asymmetric flux distributions. The behavior of such HXR footpoint asymmetry should be affected by several effects simultaneously and cannot be attributed to a single effect easily. In this study, we attempt to address the properties…
Cool Dust in the Outer Ring of NGC 1291
Murphy, E. J.; Armus, L.; Walter, F. +18 more
We examine Herschel Space Observatory images of one nearby prototypical outer ring galaxy, NGC 1291, and show that the ring becomes more prominent at wavelengths longer than 160 µm. The mass of cool dust in the ring dominates the total dust mass of the galaxy, accounting for at least 70% of it. The temperature of the emitting dust in the rin…
The Cassini Enceladus encounters 2005-2010 in the view of energetic electron measurements
Krupp, N.; Jones, G. H.; Roussos, E. +8 more
The moon Enceladus, embedded in Saturn’s radiation belts, is the main internal source of neutral and charged particles in the Kronian magnetosphere. A plume of water ice molecules and dust released through geysers on the south polar region provides enough material to feed the E-ring and also the neutral torus of Saturn and the entire magnetosphere…
Temperature and grain size dependence of near-IR spectral signature of crystalline water ice: From lab experiments to Enceladus' south pole
Le Mouélic, Stéphane; Taffin, Cécile; Grasset, Olivier +3 more
An experimental facility has been set up to acquire infrared spectra of pure water ices with controlled grain sizes ranging from 80 to 700 µm and temperatures ranging from 80 to 140 K at 10-2 mbar. Forty-seven near IR spectra (1.0-5.0 µm), selected among the total acquired spectra, permit us to determine how spectral charact…
Broadband analysis techniques for Herschel/HIFI spectral surveys of chemically rich star-forming regions
Bergin, Edwin A.; Lis, Dariusz C.; Phillips, Thomas G. +3 more
The Heterodyne Instrument for the Far Infrared (HIFI) aboard the Herschel Space Observatory has acquired high-resolution broadband molecular spectra of star-forming regions in a wavelength range that is mostly inaccessible from ground-based astronomical observatories. These spectral surveys provide new insight into the chemical composition and phy…
Is there long-range memory in solar activity on timescales shorter than the sunspot period?
Rypdal, M.; Rypdal, K.
The sunspot number (SSN), the total solar irradiance (TSI), a TSI reconstruction, and the solar flare index (SFI) are analyzed for long-range persistence (LRP). Standard Hurst analysis yields H ≈ 0.9, which suggests strong LRP. However, solar activity time series are nonstationary because of the almost-periodic 11 year smooth component, and the an…
On the Nature of the Hot Component in the Symbiotic, Supersoft X-Ray Binary AG Draconis
Sion, Edward M.; Godon, Patrick; Mikolajewska, Joanna +2 more
AG Dra is a symbiotic variable consisting of a metal-poor, yellow giant mass donor underfilling its Roche lobe and a hot accreting white dwarf, possibly surrounded by an optically thick, bright accretion disk (which could be present from wind accretion). We constructed NLTE synthetic spectral models for white dwarf spectra and optically thick accr…