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Estimating the uncorrelated dark energy evolution in the Planck era
Dai, Z. G.; Wang, F. Y.
The equation of state (EOS), w(z), is the most important parameter of dark energy. We reconstruct the evolution of this EOS in a model-independent way using the latest cosmic microwave background (CMB) data from Planck and other observations, such as type Ia supernovae, the baryonic acoustic oscillation measurements (SDSS, 6dF, BOSS, and WiggleZ),…
Some like it cold: molecular emission and effective dust temperatures of dense cores in the Pipe Nebula
Rathborne, Jill M.; Alves, João; Forbrich, Jan +4 more
Aims: The Pipe Nebula is characterized by a low star-formation rate and is therefore an ideal environment to explore how initial conditions, including core characteristics, affect star-formation efficiencies.
Methods: In a continued study of the molecular core population of the Pipe Nebula, we present a molecular-line survey of 52 cores.…
Cassini ISS observation of Saturn’s String of Pearls
Dyudina, Ulyana A.; Ingersoll, Andrew P.; Ewald, Shawn P. +2 more
We present the dynamics of the String of Pearls (SoPs) feature observed by the Cassini spacecraft’s Imaging Science Subsystem (ISS) camera between 2007 and 2010. The SoPs was originally discovered in the 5 µm images captured by Cassini VIMS instrument, where it appeared as a chain of infrared-bright spots (Momary, T.W., et al. [2006]. The Zo…
The dominance of cold and dry alteration processes on recent Mars, as revealed through pan-spectral orbital analyses
Mustard, J. F.; Head, J. W.; Rogers, A. D. +2 more
Classic low-albedo regions of the martian surface are investigated using combined reflectance and emission (;pan-spectral;) data to constrain the types of alteration mineral phases that are present at spectrally significant abundances (>10-15%). The lack of hydrated mineral species observed using near-infrared data suggests that anhydrous chemi…
Millihertz quasi-periodic oscillations and broad iron line from LMC X-1
Belloni, T.; Dewangan, G. C.; Alam, Md. Shah +2 more
We study the temporal and energy spectral characteristics of the persistent black hole X-ray binary LMC X-1 using two XMM-Newton and a Suzaku observation. We report the discovery of low-frequency (∼26-29 m Hz) quasi-periodic oscillations (QPOs). We also report the variability of the broad iron Kα line studied earlier with Suzaku. The QPOs are foun…
The Formation and Launch of a Coronal Mass Ejection Flux Rope: A Narrative Based on Observations
DeForest, C. E.; Howard, T. A.
We present a data-driven narrative of the launch and early evolution of the magnetic structure that gave rise to the coronal mass ejection (CME) on 2008 December 12. The structure formed on December 7 and launched early on December 12. We interpret this structure as a flux rope based on prelaunch morphology, postlaunch magnetic measurements, and t…
Properties of star forming galaxies in AKARI Deep Field-South
Buat, V.; Małek, K.; Burgarella, D. +6 more
Aims: The main aim of this work is the characterization of physical properties of galaxies detected in the far-infrared (FIR) in the AKARI Deep Field-South (ADF-S) survey.
Methods: Starting from a catalog of the 1000 brightest ADF-S sources in the WIDE-S (90 µm) AKARI band, we constructed a subsample of galaxies with spectral cover…
X-Ray Observations of Complex Temperature Structure in the Cool-core Cluster A85
Datta, Abhirup; Burns, Jack O.; Schenck, David E. +1 more
X-ray observations were used to examine the complex temperature structure of A85, a cool-core galaxy cluster. Temperature features can provide evidence of merging events which shock heat the intracluster gas. Temperature maps were made from both Chandra and XMM-Newton observations. The combination of a new, long-exposure XMM observation and an imp…
Suzaku view of the neutron star in the dipping source 4U 1822-37
Enoto, Teruaki; Makishima, Kazuo; Zhang, Zhongli +2 more
The dipping X-ray source 4U 1822-37 was observed by Suzaku on 2006 October 20 for a net exposure of 37 ks. The source was detected with the XIS at a 1-10 keV flux of 5.5 × 10-10 erg cm-2 s-1, and with the HXD (HXD-PIN) at a 10-50 keV flux of 8.9 × 10-10 erg cm-2 s-1. With HXD-PIN, t…
Spinning Like a Blue Straggler: The Population of Fast Rotating Blue Straggler Stars in ω Centauri
Dalessandro, E.; Monaco, L.; Mucciarelli, A. +3 more
By using high-resolution spectra acquired with FLAMES-GIRAFFE at the ESO/VLT, we measured the radial and rotational velocities for 110 blue straggler stars (BSSs) in ω Centauri, the globular cluster-like stellar system harboring the largest known BSS population. According to their radial velocities, 109 BSSs are members of the system. The rotation…