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The spectral energy distribution of galaxies at z > 2.5: Implications from the Herschel/SPIRE color-color diagram

We use the Herschel SPIRE color-color diagram to study the spectral energy distribution (SED) and the redshift estimation of high-z galaxies. We compiled a sample of 57 galaxies with spectroscopically confirmed redshifts and SPIRE detections in all three bands at $z=2.5-6.4$, and compared their average SPIRE colors with SED templates from local and high-z libraries. We find that local SEDs are inconsistent with high-z observations. The local calibrations of the parameters need to be adjusted to describe the average colors of high-z galaxies. For high-z libraries, the templates with an evolution from z=0 to 3 can well describe the average colors of the observations at high redshift. Using these templates, we defined color cuts to divide the SPIRE color-color diagram into different regions with different mean redshifts. We tested this method and two other color cut methods using a large sample of 783 Herschel-selected galaxies, and find that although these methods can separate the sample into populations with different mean redshifts, the dispersion of redshifts in each population is considerably large. Additional information is needed for better sampling.Comment: 17 pages, 14 figures, accepted for publication in A&

TRANSFORMERS: Robust spatial joins on non-uniform data distributions

Spatial joins are becoming increasingly ubiquitous in many applications, particularly in the scientific domain. While several approaches have been proposed for joining spatial datasets, each of them has a strength for a particular type of density ratio among the joined datasets. More generally, no single proposed method can efficiently join two spatial datasets in a robust manner with respect to their data distributions. Some approaches do well for datasets with contrasting densities while others do better with similar densities. None of them does well when the datasets have locally divergent data distributions. In this paper we develop TRANSFORMERS, an efficient and robust spatial join approach that is indifferent to such variations of distribution among the joined data. TRANSFORMERS achieves this feat by departing from the state-of-the-art through adapting the join strategy and data layout to local density variations among the joined data. It employs a join method based on data-oriented partitioning when joining areas of substantially different local densities, whereas it uses big partitions (as in space-oriented partitioning) when the densities are similar, while seamlessly switching among these two strategies at runtime. We experimentally demonstrate that TRANSFORMERS outperforms state-of-the-art approaches by a factor of between 2 and 8

Passende beoordeling Boomkorvisserij op vis in de Nederlandse kustzone: Deelrapport Voordelta

Dit deelrapport van ‘Passende Beoordeling Boomkorvisserij op vis in de Nederlandse kustzone’ gaat over het Natura 2000-gebied Voordelt

AKARI/IRC Broadband Mid-infrared data as an indicator of Star Formation Rate

AKARI/Infrared Camera (IRC) Point Source Catalog provides a large amount of flux data at {\it S9W} ($9\ {\rm \mu m}$) and {\it L18W} ($18\ {\rm \mu m}$) bands. With the goal of constructing Star-Formation Rate(SFR) calculations using IRC data, we analyzed an IR selected GALEX-SDSS-2MASS-AKARI(IRC/Far-Infrared Surveyor) sample of 153 nearby galaxies. The far-infrared fluxes were obtained from AKARI diffuse maps to correct the underestimation for extended sources raised by the point-spread function photometry. SFRs of these galaxies were derived by the spectral energy distribution fitting program CIGALE. In spite of complicated features contained in these bands, both the {\it S9W} and {\it L18W} emission correlate with the SFR of galaxies. The SFR calibrations using {\it S9W} and {\it L18W} are presented for the first time. These calibrations agree well with previous works based on Spitzer data within the scatters, and should be applicable to dust-rich galaxies.Comment: PASJ, in pres

Passende Beoordeling Boomkorvisserij op vis in de Nederlandse kustzone: algemeen deel

Dit algemene deel van ‘Passende Beoordeling Boomkorvisserij op vis in de Nederlandse kustzone’ en schetst het algemene kader en de uitgangspunten die op alle drie de Natura 2000-gebieden Voordelta, Noordzeekustzone en Vlakte van de Raan van toepassing zijn

eTRIKS Analytical Environment: A Modular High Performance Framework for Medical Data Analysis

Translational research is quickly becoming a science driven by big data. Improving patient care, developing personalized therapies and new drugs depend increasingly on an organization's ability to rapidly and intelligently leverage complex molecular and clinical data from a variety of large-scale partner and public sources. As analysing these large-scale datasets becomes computationally increasingly expensive, traditional analytical engines are struggling to provide a timely answer to the questions that biomedical scientists are asking. Designing such a framework is developing for a moving target as the very nature of biomedical research based on big data requires an environment capable of adapting quickly and efficiently in response to evolving questions. The resulting framework consequently must be scalable in face of large amounts of data, flexible, efficient and resilient to failure. In this paper we design the eTRIKS Analytical Environment (eAE), a scalable and modular framework for the efficient management and analysis of large scale medical data, in particular the massive amounts of data produced by high-throughput technologies. We particularly discuss how we design the eAE as a modular and efficient framework enabling us to add new components or replace old ones easily. We further elaborate on its use for a set of challenging big data use cases in medicine and drug discovery

Passende beoordeling Boomkorvisserij op vis in de Nederlandse kustzone: Bijlagen

Doel van de voorliggende Passende Beoordeling is om inzichtelijk te maken of en zo ja, in welke vorm boomkorvisserij (op vis) zich verdraagt met de instandhoudingsdoelstellingen van de drie in de Nederlandse kustzone gelegen Natura 2000-gebieden. Met andere woorden: in hoeverre staat deze activiteit het bereiken van de instandhoudingsdoelstellingen in de drie Natura 2000-gebieden in de weg? Aldus vormt deze Passende Beoordeling een belangrijk achtergronddocument op grond waarvan de intensiteit, techniek en omvang van de huidige en toekomstige bodemberoerende visserij via vergunningen kan worden gereguleerd. In de beoordeling is verdisconteerd dat de boomkor met wekkers op (korte) termijn wordt vervangen elektrische vistuigen

Passende beoordeling Boomkorvisserij op vis in de Nederlandse kustzone: Deelrapport Noordzeekustzone

Dit deelrapport van ‘Passende Beoordeling Boomkorvisserij op vis in de Nederlandse kustzone’ gaat over het Natura 2000-gebied Noordzeekustzon