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Optical-near-IR analysis of globular clusters in the IKN dwarf spheroidal: a complex star formation history
Tudorica, A.; Georgiev, I. Y.; Chies-Santos, A. L.
Context. Age, metallicity, and spatial distribution of globular clusters (GCs) provide a powerful tool for reconstructing major star-formation episodes in galaxies. IKN is a faint dwarf spheroidal (dSph) in the M 81 group of galaxies. It contains five old GCs, which makes it the galaxy with the highest known specific frequency (SN = 126…
FTIR-based measurements of self-broadening and self-shift coefficients as well as line strength in the first overtone band of HCl at 1.76 µM
Li, Gang; Serdyukov, Anton; Gisi, Michael +2 more
FTIR spectra of the 2-0 band of HCl have been measured in the 5300-5900 cm-1 spectral region at 15 different pressures (0.05-2.5 bar) and at a spectral resolution of 0.07 cm-1. For the first time, reliable and consistent self-induced broadening and shift coefficients for the complete HCl 2-0 band have been reported. Line inte…
High-energy Properties of the Enigmatic Be Star γ Cassiopeiae
Hamaguchi, K.; Shrader, C. R.; Oskinova, L. M. +3 more
We present the results of a broadband X-ray study of the enigmatic Be star Gamma Cassiopeiae (herein γ Cas) based on observations made with both the Suzaku and INTEGRAL observatories. γ Cas has long been recognized as the prototypical example of a small subclass of Be stars with moderately strong X-ray emission dominated by a hot thermal component…
A Novel Technique to Improve Photometry in Confused Images Using Graphs and Bayesian Priors
Ferguson, Henry C.; Somerville, Rachel S.; Inami, Hanae +2 more
We present a new technique for overcoming confusion noise in deep far-infrared Herschel space telescope images making use of prior information from shorter λ < 2 µm wavelengths. For the deepest images obtained by Herschel, the flux limit due to source confusion is about a factor of three brighter than the flux limit due to instrumental no…
Characteristics of He II Proximity Profiles
Anderson, Scott F.; Schneider, Donald P.; York, Donald G. +4 more
The proximity profile in the spectra of z≈ 3 quasars, where fluxes extend blueward of the He ii Lyα wavelength 304 (1+z) Å, is one of the most important spectral features in the study of the intergalactic medium (IGM). Based on the Hubble Space Telescope spectra of 24 He ii quasars, we find that the majority of them display a proximity profile, co…
HerMES: Current Cosmic Infrared Background Estimates Can Be Explained by Known Galaxies and Their Faint Companions at z < 4
Pérez-Fournon, I.; Valtchanov, I.; Ivison, R. J. +28 more
We report contributions to cosmic infrared background (CIB) intensities originating from known galaxies and their faint companions at submillimeter wavelengths. Using the publicly available UltraVISTA catalog and maps at 250, 350, and 500 µm from the Herschel Multi-tiered Extragalactic Survey, we perform a novel measurement that exploits the…
Photometric Calibration of the Lunar-based Ultraviolet Telescope for Its First Six Months of Operation on the Lunar Surface
Wang, Shen; Wang, Jing; Meng, Xian-Min +10 more
We describe the photometric calibration of the Lunar-based Ultraviolet Telescope (LUT), the first robotic astronomical telescope working on the lunar surface, for its first six months of operation on the lunar surface. Two spectral datasets (set A and B) from near-ultraviolet (NUV) to the optical band were constructed with 44 International Ultravi…
Kinematic and Energetic Properties of the 2012 March 12 Polar Coronal Mass Ejection
Gopalswamy, N.; Yashiro, S.; Akiyama, S.
We report on the energetics of the 2012 March 12 polar coronal mass ejection (CME) originating from a southern latitude of ∼60°. The polar CME is similar to low-latitude (LL) CMEs in almost all respects: three-part morphology; post-eruption arcade (PEA), CME, and filament kinematics; CME mass and kinetic energy; and the relative thermal energy con…
Constraints on the basic parameters of dark matter using the Planck data
Yang, Yupeng
Dark matter (DM) annihilation or decay can affect the anisotropy of the cosmic microwave background (CMB). Therefore, the CMB data can be used to constrain the properties of a dark matter particle. In this work, we use the new CMB data obtained by the Planck satellite to investigate the limits on the basic parameters of a dark matter particle. The…
A 3 Ga old polythermal ice sheet in Isidis Planitia, Mars: Dynamics and thermal regime inferred from numerical modeling
Bourgeois, Olivier; Pochat, Stéphane; Souček, Ondřej +1 more
Isidis Planitia is a 1350 km wide impact crater located close to the martian equator. To test the hypothesis that the 2.8 to 3.4 Ga old Thumbprint Terrain preserved on the floor of this basin is a glacial landform assemblage, we perform a numerical simulation of glaciation with a thermo-mechanically coupled model of ice sheet dynamics. As model in…