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Lyman break and ultraviolet-selected galaxies at z ∼ 1 - I. Stellar populations from the ALHAMBRA survey
Cepa, J.; Infante, L.; Molino, A. +31 more
We take advantage of the exceptional photometric coverage provided by the combination of GALEX data in the ultraviolet (UV) and the ALHAMBRA survey in the optical and near-infrared to analyse the physical properties of a sample of 1225 GALEX-selected Lyman break galaxies (LBGs) at 0.8 ≲ z ≲ 1.2 that are located in the COSMOS field. This is the lar…
CV1 in the globular cluster M 22: confirming its nature through X-ray observations and optical spectroscopy
Servillat, M.; Webb, N. A.
Context. Observations of cataclysmic variables in globular clusters appear to show a dearth of outbursts compared to those observed in the field. A number of explanations have been proposed, including low mass-transfer rates and/or moderate magnetic fields implying higher mass white dwarfs than the average observed in the field. Alternatively this…
Intensities of the Martian N2 electron-impact excited dayglow emissions
Fox, Jane L.; Hać, Nicholas E. F.
The first N2 emissions in the Martian dayglow were detected by the SPICAM UV spectrograph on board the Mars Express spacecraft. Intensities of the (0,5) and (0,6) Vegard-Kaplan bands were found to be about one third of those predicted more than 35 years ago. The Vegard-Kaplan band system arises from the transition from the lowest N…
The Production Rate of SN Ia Events in Globular Clusters
Bregman, Joel N.; Washabaugh, Pearce C.
In globular clusters, dynamical evolution produces luminous X-ray emitting binaries at a rate about 200 times greater than in the field. If globular clusters also produce SN Ia at a high rate, it would account for many of the SN Ia production in early-type galaxies and provide insight into their formation. Here we use archival Hubble Space Telesco…
The X-ray spectrum of the black hole candidate Swift J1753.5-0127
Mostafa, Reham; Mendez, Mariano; Hiemstra, Beike +4 more
We present a spectral analysis of the black hole candidate and X-ray transient source Swift J1753.5-0127 making use of simultaneous observations of XMM-Newton and Rossi X-ray Timing Explorer in 2006, when the source was in outburst. The aim of this paper is to test whether a thermal component due to the accretion disc is present in the X-ray spect…
The molecular envelope of CRL 618: A new model based on Herschel/HIFI observations
Alcolea, J.; Bujarrabal, V.; Soria-Ruiz, R.
Aims: We study the physical properties and molecular excitation of the different warm gas components found in the protoplanetary nebula CRL 618. The proper study of the nebular structure and its implications on the dynamics and kinematics of the molecular gas are of particular importance for understanding the evolution of these objects.
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Mid-infrared observations of the circumstellar disks around PDS 66 and CRBR 2422.8-3423
Wolf, S.; Gräfe, C.
Aims: We present mid-infrared observations and photometry of the circumstellar disks around
Longitudinal modulation of the brightness of Io's auroral footprint emission: Comparison with models
Bagenal, F.; Nichols, J. D.; Clarke, J. T. +3 more
auroral emission close to the foot of Io's magnetic flux tube has been known for over a decade to be one of the key parameters characterizing the electrodynamic interaction between the satellite and Jupiter's magnetosphere. Ten years of observations of Io's magnetic footprint brightness have been conducted via far ultraviolet imaging by two instru…
Sunspot Bright Points
Choudhary, Debi Prasad; Shimizu, Toshifumi
We used the flux-calibrated images from the Broad-band Filter Imager and Stokes Polarimeter data obtained with the Solar Optical Telescope onboard the Hinode spacecraft to study the properties of bright points in and around sunspots. The selected bright points are smaller in diameter than 150 km with contrasts exceeding about 3 % in the ratio of s…
A method to estimate optical distortion using planetary images
Imamura, Takeshi; Yamazaki, Atsushi; Kouyama, Toru +1 more
We developed a method to calibrate optical distortion parameters for axisymmetrical optical systems using images of a spherical target taken at a variety of distances. The method utilizes the fact that the influence of distortion on the apparent radius in the image changes with the disk size of the projected body. Because several planets can be us…