bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kinematic properties of superbubbles in the Antennae, M83 and Arp 270
Authors: Camps-Fariña A. , Beckman J. , Zaragoza-Cardiel J. , Font J. , Fathi K. , Velázquez P. Fabian , Rodríguez-González A. 
Published: February 2015

AbstractSuperbubbles and large scale expansion in galaxies are important indicators of activity in galaxies: they are formed in starbursts and around active nuclei. Superbubbles can be used to give information about the star-forming region which produced them. We present in-depth results of our study of kinematically detected superbubbles using a method based on Fabry-Perot spectroscopy, which allows us to map regions of expansion across the entire disk of a galaxy. Three objects have been selected for this poster based on the interest of the results they show: two interacting galaxies, the Antennae and Arp270, at different stages of galaxy interaction, and the more isolated galaxy M83. We present the kinematic expansion maps, as well as a census of detected superbubbles and a dynamical study of their properties.
A 3D view of galactic winds in luminous infrared galaxies
Authors: Martín-Fernández P. , Jiménez-Vicente J. , Zurita A. , Mediavilla E. , Castillo-Morales A. 
Published: February 2015

AbstractGalactic winds and outflows are an ubiquitous phenomenon in galaxies with active star formation and/or active nuclei. They constitute the main mechanism for redistributing dust and metals on large scales and are therefore a key ingredient to understand the life cycle of galaxies. Among galaxies, ULIRGs are of particular interest in this context, as they host intense starbursts and are likely to be the dominant star formers at z > 1. These objects have been shown to host important winds, but it is not yet known what is the frequency of galactic winds and their properties in galaxies with lower star formation rates (SFR). We are studying galactic winds in a sample of 21 galaxies with different SFRs (including ULIRGs) from observations with the INTEGRAL fiber spectrograph on the 4.2m WHT. In order to be able to address the complex multi–phase nature of the wind phenomenon, we have used the Na I D doublet absorption lines to trace cold gas, and a few emission lines (Hα, [N ii] and [S ii]) to trace the warmer ionized gas of the wind. The distribution and kinematics of both components in these objects is then analysed. Preliminary results show strong spatial correlation between regions with high non–circular velocities, areas with high star formation activity and regions with two different components in the emission lines. This set of data will help us to characterise the distribution and kinematics of the winds and their relation with the host galaxy type.
Interacting galaxies in 3D: Three case studies.
Authors: Fuentes-Carrera Isaura , Cárdenas-Martínez Nelli , Sánchez-Cruces Mónica , Rosado Margarita , Amram Philippe , Olguín Lorenzo , Borissova Jura , Verley Simon , Flores Héctor , Verdes-Montenegro Lourdes , Gonçalves Denise 
Published: February 2015

AbstractWe present 3D observations of three interacting galaxies in order derive their extended kinematics and to trace events such as violent star-formation (SF), mass-transfer, structure perturbation and the presence of energetic sources induced by the interacting processes.
Gas properties in the disc of NGC 891 from Herschel far-infrared spectroscopy
Authors: Hughes Thomas M. 
Published: February 2015

AbstractWe investigate the physical properties of the interstellar gas in the nearby edge-on spiral galaxy NGC 891, using Herschel PACS/SPIRE observations of the most important far-infrared (FIR) cooling lines – [Cii] 158 μm, [Nii] 122, 205 μm, [Oi] 63, 145 μm, and [Oiii] 88 μm – obtained as part of the Very Nearby Galaxy Survey (P. I.: C. D. Wilson). We compare our observations to the predictions of a photo dissociation region (PDR) model to determine the gas density, n, and the strength of the incident FUV radiation field, G0, on a pixel-by-pixel basis. The majority of PDRs in NGC 891's disc exhibit properties similar to the physical conditions found in the spiral arm and inter-arm regions of the face-on M51 galaxy. We estimate a stronger FUV field in the far north-eastern side than compared to the rest of the disc.
A Radio-Optical Study of Resolved Star Formation in SAMI Galaxies
Authors: Leslie Sarah , Kewley Lisa , Sadler Elaine , Bryant Julia 
Published: February 2015

AbstractWith integral field spectroscopic data from the the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) survey and the VLA, we will study the relationship between star formation (as traced by Hα emission) and the radio continuum emission within galaxies with the aim of better understanding the intricacies of local scaling relations.
Dust in FIR-bright ADF-S galaxies
Authors: Małek K. , Pollo A. , Takeuchi T. T. , Buat V. , Burgarella D. , Malkan M. 
Published: February 2015

AbstractMultiwavelength Spectral Energy Distributions (SEDs) of far-infrared (FIR) galaxies detected in the AKARI South Ecliptic Poles Survey (ADF-S) allow to trace differences between [Ultra]-Luminous Infrared Galaxies ([U]LIRGS) and other types of star-forming galaxies (SF).
The impact of the orientation on the lobe asymmetry in 3C328 radio galaxy
Authors: Marecki Andrzej , Ogrodnik Mateusz 
Published: February 2015

AbstractIn the double-lobed Fanaroff-Riley type-II radio galaxy 3C328, one lobe is devoid of a~hotspot. We carried out the VLBA observations of the central component of 3C328 and we found there a jet pointing towards the lobe without a hotspot. We suggest that this is because the nucleus of 3C328 remained in off-state for some time in the recent past. No jets were produced during that period so both hotspots faded out. However, under the assumption that one lobe is much farther from the observer than the other, the hotspot of the far-side lobe can be perceived as not decayed yet due to the light-travel lag. Since activity of the nucleus has been restored, we obtain a proof that it is recurrent. It follows that the orientation of the jet is not a paradox.
New empirical metallicity calibrations: Joint analysis of CALIFA data and literature Te-based measurements
Authors: Marino R. A. , Rosales-Ortega F. F. , Sánchez F. , de Paz A. Gil ,   the CALIFA team
Published: February 2015

AbstractIn Marino et al. (2013) we provide revisited empirical calibrations for the oxygen abundances in HII regions based on the O3N2 and N2 indicators. This work is based on the most comprehensive compilation of both Te-based and multiple strong-line (ONS-based) ionized-gas abundance measurements in external galaxies to date in terms of all statistical significance, quality, and coverage of the parameters space. Our dataset compiles the Te-based abundances of 603 HII regions extracted from the literature but also includes new measurements from the CALIFA survey. We also present a comparison between our revisited calibrations with a total of 3423 additional CALIFA HII complexes with abundances derived using the ONS calibration. The O3N2 and N2 indicators can be empirically applied to derive oxygen abundances calibrations from either direct-abundance determinations with random errors of 0.18 and 0.16, respectively, and they show shallower abundance dependencies and statistically significant offsets compared to the classical calibrations (as the one of Pettini & Pagel (2004)).
The Angular Momentum Dichotomy
Authors: Teklu Adelheid , Remus Rhea-Silvia , Dolag Klaus , Burkert Andreas 
Published: February 2015

AbstractIn the context of the formation of spiral galaxies the evolution and distribution of the angular momentum of dark matter halos have been discussed for more than 20 years, especially the idea that the specific angular momentum of the halo can be estimated from the specific angular momentum of its disk (e.g. Fall & Efstathiou (1980), Fall (1983) and Mo et al. (1998)). We use a new set of hydrodynamic cosmological simulations called Magneticum Pathfinder which allow us to split the galaxies into spheroidal and disk galaxies via the circularity parameter ϵ, as commonly used (e.g. Scannapieco et al. (2008)). Here, we focus on the dimensionless spin parameter λ = J |E|1/2 / (G M5/2) (Peebles 1969, 1971), which is a measure of the rotation of the total halo and can be fitted by a lognormal distribution, e.g. Mo et al. (1998). The spin parameter allows one to compare the relative angular momentum of halos across different masses and different times. Fig. 1 reveals a dichotomy in the distribution of λ at all redshifts when the galaxies are split into spheroids (dashed) and disk galaxies (dash-dotted). The disk galaxies preferentially live in halos with slightly larger spin parameter compared to spheroidal galaxies. Thus, we see that the λ of the whole halo reflects the morphology of its central galaxy. For more details and a larger study of the angular momentum properties of disk and spheroidal galaxies, see Teklu et al. (in prep.).
Radio Recombination Line studies on M82 from LOFAR HBA observations
Authors: Toribio M. C. , Morabito L. K. , Oonk J. B. R. , Salgado F. , Tielens A. G. G. M. , Röttgering H. J. A. 
Published: February 2015

AbstractWe continue our search for extragalactic Carbon Radio Recombination Lines (CRRL) in M82 with the LOw Frequency ARray (LOFAR; van Haarlem et al.2013). The goal of our project is to determine the physical conditions of the cold neutral gas in this object, for which low frequency radio recombination lines can provide a sensitive probe.
A 3D Search for the Interplay between AGN and Star Formation in Galaxies
Authors: Wolf Marsha , Hooper Eric , Sanders Ryan , Liu Charles 
Published: February 2015

AbstractIntegral field spectroscopy and radio interferometry are very powerful tools for studying the interplay between AGN and star formation (SF) in galaxies. We introduce a sample of SDSS galaxies with selection criteria designed to maximize our chances of catching both processes in action. The galaxies are post-starburst, potentially contain radio AGN, and are allowed, but not required, to have ongoing star formation. The resulting sample includes objects classified as traditional post-starbursts and ones that would have been classified as Seyferts based on their emission line properties alone. The systems span a range of merger phases from initial interaction to fully merged, providing snapshots throughout the entire sequence. We are compiling a multi-wavelength data set, including spatially resolved optical spectra from IFUs on WIYN and continuum radio maps from the VLA and GMRT. Here we present initial results on J0754+1648, an interacting system with a post-starburst region near a radio AGN surrounded by highly ionized gas. This object may be an example of SF truncated by AGN feedback.
Using 3D Spectroscopy to Probe the Orbital Structure of Composite Bulges
Authors: Erwin Peter , Saglia Roberto , Thomas Jens , Fabricius Maximilian , Bender Ralf , Rusli Stephanie , Nowak Nina , Beckman John E. , Beltrán Juan Carlos Vega 
Published: February 2015

AbstractDetailed imaging and spectroscopic analysis of the centers of nearby S0 and spiral galaxies shows the existence of “composite bulges”, where both classical bulges and disky pseudobulges coexist in the same galaxy. As part of a search for supermassive black holes in nearby galaxy nuclei, we obtained VLT-SINFONI observations in adaptive-optics mode of several of these galaxies. Schwarzschild dynamical modeling enables us to disentangle the stellar orbital structure of the different central components, and to distinguish the differing contributions of kinematically hot (classical bulge) and kinematically cool (pseudobulge) components in the same galaxy.
The Distribution of Mass in (Disk) Galaxies: Maximal or Not?
Authors: Courteau Stéphane 
Published: February 2015

AbstractThe relative distribution of matter in galaxies ought to be one of the most definitive predictions of galaxy formation models yet its validation is challenged by numerous observational, theoretical, and operational challenges. All galaxies are believed to be dominated by an invisible matter component in their outskirts. A debate has however been blazing for the last two decades regarding the relative fraction of baryons and dark matter in the inner parts of galaxies: whether galaxies are centrally dominated by baryons (“maximal disk”) is of issue. Some of those debates have been misconstrued on account of operational confusion, such as dark matter fractions being measured and compared at different radii. All galaxies are typically baryon-dominated (maximal) at the center and dark-matter dominated (sub-maximal) in their outskirts; for low-mass galaxies (Vtot ≲ 200 km s− 1), the mass of the dark halo equals the stellar mass at least within 2 disk scale lengths, the transition occurs at larger effective radii for more massive galaxies. An ultimate goal for galaxy structure studies is to achieve accurate data-model comparisons for the relative fractions of baryonic to total matter at any radius.
Much of the ‘economics of property rights’ devalues property and legal rights
Authors: HODGSON GEOFFREY M. 
Published: February 2015

AbstractLegal theorists and other commentators have long established a distinction between property and possession. According to this usage adopted here, possession refers to control of a resource, but property involves legally sanctioned rights. Strikingly, prominent foundational accounts of the ‘economics of property rights’ concentrate on possession, downplaying the issue of legitimate legal rights (Alchian, 1965, 1977; Barzel, 1994, 1997, 2002; von Mises, 1981). Some authors in this genre make a distinction between ‘economic rights’ and ‘legal rights’ where the former are more to do with possession or the capacity to control. They argue that ‘economic rights’ are primary and more relevant for understanding behaviour. But it is argued here that legal factors – involving recognition of authority and perceived justice or morality – have also to be brought into the picture to understand human motivation in modern societies, even in the economic sphere. As other authors including Hernando De Soto (2000) have pointed out, the neglect of the legal infrastructure that buttresses property has deleterious implications, including a failure to understand the role of property in supporting collateralized loans for innovation and economic development.
Discordance of DNA Methylation Variance Between two Accessible Human Tissues
Authors: Jiang Ruiwei , Jones Meaghan J. , Chen Edith , Neumann Sarah M. , Fraser Hunter B. , Miller Gregory E. , Kobor Michael S. 
Published: February 2015

AbstractPopulation epigenetic studies have been seeking to identify differences in DNA methylation between specific exposures, demographic factors, or diseases in accessible tissues, but relatively little is known about how inter-individual variability differs between these tissues. This study presents an analysis of DNA methylation differences between matched peripheral blood mononuclear cells (PMBCs) and buccal epithelial cells (BECs), the two most accessible tissues for population studies, in 998 promoter-located CpG sites. Specifically we compared probe-wise DNA methylation variance and how this variance related to demographic factors across the two tissues. PBMCs had overall higher DNA methylation than BECs and the two tissues tended to differ most at genomic regions of low CpG density. Furthermore, although both tissues showed appreciable probe-wise variability, the specific regions and magnitude of variability differed strongly between tissues. Lastly, through exploratory association analysis, we found indication of differential association of BEC and PBMC with demographic variables. The work presented here offers insight into variability of DNA methylation between individuals and across tissues and helps guide decisions on the suitability of buccal epithelial or peripheral mononuclear cells for the biological questions explored by epigenetic studies in human populations.
Muographic mapping of the subsurface density structures in Miura, Boso and Izu peninsulas, Japan
Authors: Tanaka Hiroyuki K. M. 
Published: February 2015

AbstractWhile the benefits of determining the bulk density distribution of a landmass are evident, established experimental techniques reliant on gravity measurements cannot uniquely determine the underground density distribution. We address this problem by taking advantage of traffic tunnels densely distributed throughout the country. Cosmic ray muon flux is measured in the tunnels to determine the average density of each rock overburden. After analyzing the data collected from 146 observation points in Miura, South-Boso and South-Izu Peninsula, Japan as an example, we mapped out the shallow density distribution of an area of 1340 km2. We find a good agreement between muographically determined density distribution and geologic features as described in existing geological studies. The average shallow density distribution below each peninsula was determined with a great accuracy (less than ±0.8%). We also observed a significant reduction in density along fault lines and interpreted that as due to the presence of multiple cracks caused by mechanical stress during recurrent seismic events. We show that this new type of muography technique can be applied to estimate the terrain density and porosity distribution, thus determining more precise Bouguer reduction densities.
Optical nano-woodpiles: large-area metallic photonic crystals and metamaterials
Authors: Ibbotson Lindsey A. , Demetriadou Angela , Croxall Stephen , Hess Ortwin , Baumberg Jeremy J. 
Published: February 2015

AbstractMetallic woodpile photonic crystals and metamaterials operating across the visible spectrum are extremely difficult to construct over large areas, because of the intricate three-dimensional nanostructures and sub-50 nm features demanded. Previous routes use electron-beam lithography or direct laser writing but widespread application is restricted by their expense and low throughput. Scalable approaches including soft lithography, colloidal self-assembly and interference holography, produce structures limited in feature size, material durability, or geometry. By multiply stacking gold nanowire flexible gratings, we demonstrate a scalable high-fidelity approach for fabricating flexible metallic woodpile photonic crystals, with features down to 10 nm produced in bulk and at low cost. Control of stacking sequence, asymmetry and orientation elicits great control, with visible-wavelength band-gap reflections exceeding 60% and with strong induced chirality. Such flexible and stretchable architectures can produce metamaterials with refractive index near zero and are easily tuned across the IR and visible ranges.
Real-space anisotropic dielectric response in a multiferroic skyrmion lattice
Authors: Chu P. , Xie Y. L. , Zhang Y. , Chen J. P. , Chen D. P. , Yan Z. B. , Liu J. -M. 
Published: February 2015

AbstractA magnetic skyrmion lattice is a microstructure consisting of hexagonally aligned skyrmions. While a skyrmion as a topologically protected carrier of information promises a number of applications, an easily accessible probe of the skyrmion and skyrmion lattice at mesoscopic scale is of significance. It is known that neutron scattering, Lorentz transmission electron microscopy and spin-resolved STM as effective probes of skyrmions have been established. In this work, we propose that the spatial contour of dielectric permittivity in a skyrmion lattice with ferromagnetic interaction and in-plane (xy) Dzyaloshinskii-Moriya (DM) interaction can be used to characterize the skyrmion lattice. The phase field and Monte Carlo simulations are employed to develop the one-to-one correspondence between the magnetic skyrmion lattice and dielectric dipole lattice, both exhibiting the hexagonal symmetry. Under excitation of in-plane electric field in the microwave range, the dielectric permittivity shows the dumbbell-like pattern with the axis perpendicular to the electric field, while it is circle-like for the electric field along the z-axis. The dependences of the spatial contour of dielectric permittivity on external magnetic field along the z-axis and dielectric frequency dispersion are discussed.
From Dust Devil to Sustainable Swirling Wind Energy
Authors: Zhang Mingxu , Luo Xilian , Li Tianyu , Zhang Liyuan , Meng Xiangzhao , Kase Kiwamu , Wada Satoshi , Yu Chuck Wah , Gu Zhaolin 
Published: February 2015

AbstractDust devils are common but meteorologically unique phenomena on Earth and on Mars. The phenomenon produces a vertical vortex motion in the atmosphere boundary layer and often occurs in hot desert regions, especially in the afternoons from late spring to early summer. Dust devils usually contain abundant wind energy, for example, a maximum swirling wind velocity of up to 25 m/s, with a 15 m/s maximum vertical velocity and 5 m/s maximum near-surface horizontal velocity can be formed. The occurrences of dust devils cannot be used for energy generation because these are generally random and short-lived. Here, a concept of sustained dust-devil-like whirlwind is proposed for the energy generation. A prototype of a circular shed with pre-rotation vanes has been devised to generate the whirlwind flow by heating the air inflow into the circular shed. The pre-rotation vanes can provide the air inflow with angular momentum. The results of numerical simulations and experiment illustrate a promising potential of the circular shed for generating swirling wind energy via the collection of low-temperature solar energy.
Self-Assembled Wiggling Nano-Structures and the Principle of Maximum Entropy Production
Authors: Belkin A. , Hubler A. , Bezryadin A. 
Published: February 2015

AbstractWhile behavior of equilibrium systems is well understood, evolution of nonequilibrium ones is much less clear. Yet, many researches have suggested that the principle of the maximum entropy production is of key importance in complex systems away from equilibrium. Here, we present a quantitative study of large ensembles of carbon nanotubes suspended in a non-conducting non-polar fluid subject to a strong electric field. Being driven out of equilibrium, the suspension spontaneously organizes into an electrically conducting state under a wide range of parameters. Such self-assembly allows the Joule heating and, therefore, the entropy production in the fluid, to be maximized. Curiously, we find that emerging self-assembled structures can start to wiggle. The wiggling takes place only until the entropy production in the suspension reaches its maximum, at which time the wiggling stops and the structure becomes quasi-stable. Thus, we provide strong evidence that maximum entropy production principle plays an essential role in the evolution of self-organizing systems far from equilibrium.
Fabrication of Nb2O5 Nanosheets for High-rate Lithium Ion Storage Applications
Authors: Liu Meinan , Yan Cheng , Zhang Yuegang 
Published: February 2015

AbstractNb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air. The structural characterization reveals that the thickness of these sheets is around 50 nm and the length of sheets is 500 ~ 800 nm. Such a unique two dimensional structure enables the nanosheet electrode with superior performance during the charge-discharge process, such as high specific capacity (~184 mAh·g−1) and rate capability. Even at a current density of 1 A·g−1, the nanosheet electrode still exhibits a specific capacity of ~90 mAh·g−1. These results suggest the Nb2O5 nanosheet is a promising candidate for high-rate lithium ion storage applications.