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The Earth's bow shock velocity distribution function
Maksimovic, M.; Meziane, K.; Hamza, A. M. +1 more
It is well established that interplanetary disturbances cause the Earth's bow shock to move sunward or earthward. Since the launch of the Cluster mission, precise determination of the shock velocity was carried out allowing for the possibility to perform sophisticated investigations about the shock dynamics. The shock normal and velocity are deter…
UrHip Proper Motion Catalog
Frouard, J.; Dorland, B. N.; Makarov, V. V. +2 more
Proper motions are computed and collected in a catalog using the Hipparcos positions (epoch 1991.25) and URAT1 positions (epoch 2012.3-2014.6). The goal is to obtain a significant improvement on the proper motion accuracy of single stars in the northern hemisphere, and to identify new astrometric binaries perturbed by orbital motion. For binaries …
Exploring the active galactic nuclei population with extreme X-ray-to-optical flux ratios (fx/fo > 50)
Ballo, L.; Carrera, F. J.; Watson, M. G. +8 more
The cosmic history of the growth of supermassive black holes in galactic centres parallels that of star formation in the Universe. However, an important fraction of this growth occurs inconspicuously in obscured objects, where ultraviolet/optical/near-infrared emission is heavily obscured by dust. Since the X-ray flux is less attenuated, a high X-…
Low-end mass function of the arches cluster
Kim, Sungsoo S.; Shin, Jihye
The initial mass function (IMF) of the Arches cluster, which was formed a few million years ago in the harsh environment of the Galactic Centre (GC), has long been a target of interest to those who study the GC and the theory of star formation. The distinct star-forming conditions in the GC might have caused the cluster to have a shallower slope o…
Infrared Spectral Properties of M Giants
Sloan, G. C.; Goes, C.; Ramirez, R. M. +2 more
We observed a sample of 20 M giants with the Infrared Spectrograph on the Spitzer Space Telescope. Most show absorption structure at 6.6-6.8 µm which we identify as water vapor, and in some cases, the absorption extends from 6.4 µm into the SiO band at 7.5 µm. Variable stars show stronger H2O absorption. While the stre…
Multiscale field-aligned current analyzer
Marghitu, O.; Narita, Y.; Vogt, J. +3 more
The magnetosphere-ionosphere coupling is achieved, essentially, by a superposition of quasi-stationary and time-dependent field-aligned currents (FACs), over a broad range of spatial and temporal scales. The planarity of the FAC structures observed by satellite data and the orientation of the planar FAC sheets can be investigated by the well-estab…
Submillimeter Observations of CLASH 2882 and the Evolution of Dust in this Galaxy
Staguhn, Johannes; Walter, Fabian; Egami, Eiichi +7 more
Two millimeter observations of the MACS J1149.6+2223 cluster have detected a source that was consistent with the location of the lensed MACS 1149-JD galaxy at z = 9.6. A positive identification would have rendered this galaxy as the youngest dust forming galaxy in the universe. Follow up observation with the AzTEC 1.1 mm camera and the IRAM NOrthe…
Consistency of the nonflat Λ CDM model with the new result from BOSS
Kumar, Suresh
Using 137,562 quasars in the redshift range 2.1 ≤z ≤3.5 from the data release 11 (DR11) of the baryon oscillation spectroscopic survey (BOSS) of Sloan Digital Sky Survey (SDSS)-III, the BOSS-SDSS collaboration estimated the expansion rate H (z =2.34 )=222 ±7 km /s /Mpc of the Universe, and reported that this value is in tension with the prediction…
Detection of Solar Wind Disturbances: Mexican Array Radio Telescope IPS Observations at 140 MHz
Aguilar-Rodriguez, E.; Gonzalez-Esparza, J. A.; Romero-Hernandez, E. +2 more
The interplanetary scintillation (IPS) technique is a remote-sensing method for monitoring solar-wind perturbations. The Mexican Array Radio Telescope (MEXART) is a single-station instrument operating at 140 MHz, fully dedicated to performing solar-wind studies employing the IPS technique. We report MEXART solar-wind measurements (scintillation in…
Martian electron density profiles retrieved from Mars Express dual-frequency radio occultation measurements
Cui, J.; Zhang, S. J.; Guo, P. +4 more
The S- and X-band dual-frequency Doppler radio occultation observations obtained by the Mars Express Radio Science (MaRS) experiments are reduced in this study. A total of 414 Martian electron density profiles are retrieved covering the period from DOY 93 2004 to DOY 304 2012. These observations are well distributed over both longitude and latitud…