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The K-selected Butcher-Oemler Effect
Full text linkWe investigate the Butcher-Oemler effect using samples of galaxies brighter than observed frame K* + 1.5 in 33 clusters at 0.1 {approx}< z {approx}< 0.9. We attempt to duplicate as closely as possible the methodology of Butcher & Oemler. Apart from selecting in the K-band, the most important difference is that we use a brightness limit fixed at 1.5 magnitudes below an observed frame K* rather than the nominal limit of rest frame M(V ) = -20 used by Butcher & Oemler. For an early type galaxy at z = 0.1 our sample cutoff is 0.2 magnitudes brighter than rest frame M(V ) = -20, while at z = 0.9 our cutoff is 0.9 magnitudes brighter. If the blue galaxies tend to be faint, then the difference in magnitude limits should result in our measuring lower blue fractions. A more minor difference from the Butcher & Oemler methodology is that the area covered by our galaxy samples has a radius of 0.5 or 0.7 Mpc at all redshifts rather than R{sub 30}, the radius containing 30% of the cluster population. In practice our field sizes are generally similar to those used by Butcher & Oemler. We find the fraction of blue galaxies in our K-selected samples to be lower on average than that derived from several optically selected samples, and that it shows little trend with redshift. However, at the redshifts z < 0.6 where our sample overlaps with that of Butcher & Oemler, the difference in fB as determined from our K-selected samples and those of Butcher & Oemler is much reduced. The large scatter in the measured f{sub B}, even in small redshift ranges, in our study indicates that determining the f{sub B} for a much larger sample of clusters from K-selected galaxy samples is important. As a test of our methods, our data allow us to construct optically-selected samples down to rest frame M(V ) = -20, as used by Butcher & Oemler, for four clusters that are common between our sample and that of Butcher & Oemler. For these rest V selected samples, we find similar fractions of blue galaxies to Butcher & Oemler, while the K selected samples for the same 4 clusters yield blue fractions which are typically half as large. This comparison indicates that selecting in the K-band is the primary difference between our study and previous optically-based studies of the Butcher & Oemler effect. Selecting in the observed K-band is more nearly a process of selecting galaxies by their mass than is the case for optically-selected samples. Our results suggest that the Butcher-Oemler effect is at least partly due to low mass galaxies whose optical luminosities are boosted. These lower mass galaxies could evolve into the rich dwarf population observed in nearby clusters
Joshua Davis: Author of Spare Parts
Full text linkCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
The K-Selected Butcher-Oemler Effect
No full textWe investigate the Butcher-Oemler effect using samples of galaxies brighter than observed-frame K* + 1.5 in 33 clusters at 0.1 ≲z≲0.9. We attempt to duplicate as closely as possible the methodology of Butcher & Oemler. Apart from selecting in the AT
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
Analysis of Roman Silver coins, Augustus to the reform of Trajan (27 BC - AD 100)
No full textIn 2001 funding was obtained from the Leverhulme Trust (Grant No. RF&G/6/2002/0336) and the Faculty of Arts and Sciences Research Committee and the University Research Board of the American University of Beirut, Lebanon to undertake a one year project to apply this methodology to the coinage of the first Imperial dynasty, that of the Julio-Claudians. A more sensitive analytical technique was employed, inductively-coupled plasma atomic emission spectrometry (ICP-AES), that enabled much better quality data for important trace elements, such as arsenic, tin and bismuth, to be obtained. These data, together with scanning electron microscopy (SEM), micro-analysis (SEM-EDS), optical microscopy (metallography) and some limited lead isotope analysis by laser ablation multi-collector inductively-coupled plasma mass spectrometry (LA-MC-ICP-MS) form the basis of a series of publications in print (Butcher and Ponting 2005a), in press (Butcher and Ponting 2005b) and in preparation.
In 2006 a second stage of the project was awarded funding from the Arts and Humanities Research Council (AHRC) over three years (Grant ID: 119434). This project used the same suite of analytical techniques to investigate a much larger number of coins, including an expanded programme of lead isotope analyses (by thermal ionisation mass spectrometry). The first stage of this project resulted in a number of journal publications and contributions to edited volumes (Butcher et al. 2009; Butcher and Ponting 2012; Ponting 2009 and 2012). In 2014 a substantial monograph will be published that brings together and discusses the results from all the above projects covering Roman Imperial silver coinage up until the Reform of Trajan. It is the raw data upon which this monograph is based that are archived here
K. Butcher, Roman Syria and the Near East, Londres (2003)
No full textSartre Maurice. K. Butcher, Roman Syria and the Near East, Londres (2003) . In: Topoi, volume 14/2, 2006. pp. 655-659
The K-Selected Butcher-Oemler Efffect * (or lack of...)
No full textWe derive the blue fraction for a sample of K-selected galaxies in 25 clusters at 0.15 < z < 0.92. We find a much smaller blue fraction and weaker trend with redshift than measured in optically selected samples. We suggest that the Butcher-Oemler effect is primarily due to star forming low luminosity galaxies
An audit to determine the clinical effectiveness of a pathway for managing wound infection
No full textPrevention of wound infection is a key objective in the planning of care for patients with wounds. The potential for wound infection, particularly in chronic wounds that are heavily contaminated with bacteria, can be high (Bowler et al, 2001). Wound infection can negatively affect the patient experience, causing pain, delayed healing and poor clinical outcomes (Butcher, 2011). This article outlines the introduction of a clinical pathway for identifying and managing wound infection in a community nursing service. The article sets out the results of an audit to investigate the efficacy of the pathway, and discusses the importance of identifying and managing wound infection risk in patient care
FIGURE 3. K in Three new species of Kerevata (Braconidae: Rogadinae: Clinocentrini) from mainland Papua New Guinea
No full textFIGURE 3. K. jamesmayi sp. nov. A, wings; B, mesosoma, lateral view; C, metasomal tergites 1– 3, oblique view.Published as part of Butcher, Buntika Areekul & Quicke, Donald L. J., 2014, Three new species of Kerevata (Braconidae: Rogadinae: Clinocentrini) from mainland Papua New Guinea, pp. 338-346 in Zootaxa 3811 (3) on page 342, DOI: 10.11646/zootaxa.3811.3.4, http://zenodo.org/record/22751
FIGURE 5. K in Three new species of Kerevata (Braconidae: Rogadinae: Clinocentrini) from mainland Papua New Guinea
No full textFIGURE 5. K. hammondi sp. nov. A, habitus; B, mesosoma, dorsal view; C, head, front view; D, head, dorsal view.Published as part of Butcher, Buntika Areekul & Quicke, Donald L. J., 2014, Three new species of Kerevata (Braconidae: Rogadinae: Clinocentrini) from mainland Papua New Guinea, pp. 338-346 in Zootaxa 3811 (3) on page 344, DOI: 10.11646/zootaxa.3811.3.4, http://zenodo.org/record/22751
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