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AKARI DEEP FIELD SOUTH: SPECTROSCOPIC OBSERVATIONS OF INFRARED SOURCES
Chris Sedgwick,STEPHEN SERJEANT,CHRIS PEARSON,Shuji Matsuura,MAI SHIRAHATA,Hideo Matsuhara,Lucia Marchetti,Glenn J. White,Mattia Vaccari,Ivano Baronchelli,Giulia Rodighiero,Bunyo Hadsukade,David L. Cl 한국천문학회 2017 天文學論叢 Vol.32 No.1
We present a summary of our spectroscopic redshift catalogue of 404 sources in the {\it AKARI} Deep Field South (ADF-S). We have used the AAOmega spectrograph to target mid-infrared and far-infrared sources selected primarily from {\it AKARI} observations in this field for which we were able to obtain optical counterparts. Our sources with identified redshifts include 316 with H$\alpha$ detections at z ≤ 0.345 and 15 sources at z > 1 with MgII or Lyα emission lines. About 13% of our z ≤0.345 sources are dominated by active galactic nuclei (AGN) emission, although many show emission from both star formation and AGNs. The median Balmer decrement is 5.9. Ultra-luminous infrared galaxies (ULIRGs) were found only in the higher-redshift sources. Optical and near infrared data will be available shortly, enabling calibration of the line luminosities and spectral energy distribution (SED) fitting for these sources.
Chris Sedgwick,STEPHEN SERJEANT,CHRIS PEARSON,I. Yamamura,S. Makiuti,N. Ikeda,Y. Fukuda,S. Oyabu,T. Koga,S. Amber,Glenn J. White 한국천문학회 2017 天文學論叢 Vol.32 No.1
We have identified 22 quasars in the AKARI far-infrared all-sky Bright Source Catalogue, using a matching radius of < 10 “, and excluding matches which are close to foreground extended sources or cirrus. We have confirmed a relation between quasar optical luminosity and far-infrared luminosity which was found in an earlier study. In addition, we have found that the 11 sources which are at redshift z > 1 are magnified with respect to the predicted far-infrared luminosity, and consider this may be due to gravitational lensing. If confirmed, this would provide a new way to identify lenses; if not, we may have identified an interesting new population of extreme starbursting quasars. %We are currently seeking spectroscopic confirmation of the redshifts and improved imaging for these sources.
DETECTION OF Hα EMISSION FROM z>3.5 GALAXIES WITH AKARI-FUHYU NIR SPECTROSCOPY
Sedgwick, Chris,Serjeant, Stephen,Pearson, Chris,Takagi, Toshinobu,Matsuhara, Hideo,Wada, Takehiko,Lee, Hyung Mok,Im, Myungshin,Jeong, Woong-Seob,Oyabu, Shinki,White, Glenn J. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
This paper presents $H{\alpha}$ emission line detections for four galaxies at z > 3.5 made with AKARI as part of the FUHYU mission program. These are the highest-redshift $H{\alpha}$ detections to date in star-forming galaxies. AKARI's unique near-infrared spectroscopic capability has made these detections possible. For two of these galaxies, this represents the first evidence of their redshifts and confirms their physical association with a companion radio galaxy. The star formation rates (SFRs) estimated from the $H{\alpha}$ lines under-predict the SFRs estimated from their far-infrared luminosities by a factor of ~ 2 - 3. We have also detected broad $H{\alpha}$ components in the two radio galaxies which indicate the presence of quasars.
THE SYNERGY OF LARGE AREA SURVEYS WITH AKARI AND HERSCHEL
Pearson, Chris,Serjeant, Stephen,Sedgwick, Chris,White, Glenn J.,Matsuhara, Hideo,Takagi, Toshinobu,Nagisa, Oi,Murata, Kazumi,Nakagawa, Takao,Yamamura, Issei The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
The Herschel Space Observatory is the European Space Agency's state of the art infrared space telescope launched into space on 14 May 2009, covering the wavelength range from 70-700 microns with 3 instruments SPIRE, PACS and HIFI. Large area surveys are being carried out by Herschel in the AKARI legacy fields at the North and South Ecliptic Poles and the AKARI All-Sky Survey provides additional synergy with the largest survey with Herschel, H-ATLAS, covering more than 500 square degrees. This paper reports on some of the early results of these synergies between Herschel and AKARI including the first comparison of the AKARI All-Sky Survey number counts with the deeper Herschel surveys.
HERSCHEL OBSERVATIONS IN THE AKARI NEP FIELD: INITIAL SOURCE COUNTS
Chris Pearson,Ryan Cheale,STEPHEN SERJEANT,Hideo Matsuhara,Glenn J. White,Denis Burgarella,Ivan Valtchanov,Bruno Altieri,David L. Clements,Ros Hopwood 한국천문학회 2017 天文學論叢 Vol.32 No.1
The preliminary data reduction, analysis and first results from the Herschel survey of the AKARI NEP field are presented. Herschel SPIRE observations of the NEP-Wide region and PACS observations of the NEP-Deep region have yielded galaxy catalogues of 4000 and 900 sources respectively down to flux density levels of approximately 15 mJy at 100-250 microns. Source counts produced from these catalogues reach cosmologically significant depths tracing the evolutionary upturn and turnover in the source counts. The source counts are in agreement with other large area surveys carried out with Herschel bridging the gap between the shallow and deep Herschel surveys.
Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
Barnett Chris J.,Orbaek White Alvin,Barron Andrew R. 한국탄소학회 2021 Carbon Letters Vol.31 No.5
Multi-walled carbon nanotubes (MWCNTs) grown by chemical vapor deposition retain the residual catalyst particles from which the growth occurred, which are considered a detriment to MWCNTs’ performance, especially electrical conductivity. The frst direct measurements have been made of the electrical transport through the catalyst cap into the MWCNT using nanoscale 2-point-probe to determine the efects of the catalyst particle’s size and the diameter ratio with its associated MWCNT on the electrical transport through the catalyst cap as compared to the inherent conductivity of the MWCNT. The MWCNT diameter is independent of the catalyst size, but the ratio of the catalyst cap diameter to MWCNT diameter (DC/DNT) determines the conduction mechanism. Where DC/DNT is greater than 1 the resulting I–V curve is near ohmic, and the conduction through the catalyst (RC+NT) approaches that of the MWCNT (RNT); however, when the DC/DNT<1 the I–V curves shift to rectifying and RC+NT> >RNT. The experimental results are discussed in relation to current crowding at the interface between catalyst and nanotube due to an increased electric feld.
RADIO IDENTIFICATIONS IN THE NEP DEEP FIELD
Glenn J. White,Laia Barrufet de Soto,CHRIS PEARSON,STEPHEN SERJEANT,Tanya Lim,Hideo Matsuhara,S.K.Sirothia,S.Pal,Marios Karouzos 한국천문학회 2017 天文學論叢 Vol.32 No.1
We have imaged the AKARI Deep Field with the GMRT radio telescope at 610 MHz, detecting 1224 radio components, which are optically identified with 455 optical galaxies having a mean r' magnitude brighter of 22.5 (to a completeness limit of 25.4 mag), and an average redshift ~ 0.8.
Measurement of Clavicle Fracture Shortening Using Computed Tomography and Chest Radiography
Reza Omid,Chris Kidd,Anthony Yi,Diego Villacis,Eric White 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.4
Background: Nonoperative management of midshaft clavicle fractures has resulted in widely disparate outcomes and there is growing evidence that clavicle shortening poses the risk of unsatisfactory functional outcomes due to shoulder weakness and nonunion. Unfortunately, the literature does not clearly demonstrate the superiority of one particular method for measuring clavicle shortening. The purpose of this study was to compare the accuracy of clavicle shortening measurements based on plain radiographs with those based on computed tomography (CT) reconstructed images of the clavicle. Methods: A total of 51 patients with midshaft clavicle fractures who underwent both a chest CT scan and standardized anteroposterior chest radiography on the day of admission were included in this study. Both an orthopedic surgeon and a musculoskeletal radiologist measured clavicle shortening for all included patients. We then determined the accuracy and intraclass correlation coefficients for the imaging modalities. Bland-Altman plots were created to analyze agreement between the modalities and a paired t-test was used to determine any significant difference between measurements. Results: For injured clavicles, radiographic measurements significantly overestimated the clavicular length by a mean of 8.2 mm (standard deviation [SD], ± 10.2; confidence interval [CI], 95%) compared to CT-based measurements (p < 0.001). The intraclass correlation was 0.96 for both plain radiograph- and CT-based measurements (p = 0.17). Conclusions: We found that plain radiograph-based measurements of midshaft clavicle shortening are precise, but inaccurate. When clavicle shortening is considered in the decision to pursue operative management, we do not recommend the use of plain radiograph-based measurements.
Stc1: A Critical Link between RNAi and Chromatin Modification Required for Heterochromatin Integrity
Bayne, Elizabeth H.,White, Sharon A.,Kagansky, Alexander,Bijos, Dominika A.,Sanchez-Pulido, Luis,Hoe, Kwang-Lae,Kim, Dong-Uk,Park, Han-Oh,Ponting, Chris P.,Rappsilber, Juri,Allshire, Robin C. Cell Press 2010 Cell Vol.140 No.5
<P><B>Summary</B></P><P>In fission yeast, RNAi directs heterochromatin formation at centromeres, telomeres, and the mating type locus. Noncoding RNAs transcribed from repeat elements generate siRNAs that are incorporated into the Argonaute-containing RITS complex and direct it to nascent homologous transcripts. This leads to recruitment of the CLRC complex, including the histone methyltransferase Clr4, promoting H3K9 methylation and heterochromatin formation. A key question is what mediates the recruitment of Clr4/CLRC to transcript-bound RITS. We have identified a LIM domain protein, Stc1, that is required for centromeric heterochromatin integrity. Our analyses show that Stc1 is specifically required to establish H3K9 methylation via RNAi, and interacts both with the RNAi effector Ago1, and with the chromatin-modifying CLRC complex. Moreover, tethering Stc1 to a euchromatic locus is sufficient to induce silencing and heterochromatin formation independently of RNAi. We conclude that Stc1 associates with RITS on centromeric transcripts and recruits CLRC, thereby coupling RNAi to chromatin modification.</P>
THE RADIO-FAR INFRARED CORRELATION IN THE NEP DEEP FIELD
Laia Barrufet,Glenn J. White,Chris Pearson,STEPHEN SERJEANT,Tanya Lim,Hideo Matsuhara,Nagisa Oi,Marios Karouzos 한국천문학회 2017 天文學論叢 Vol.32 No.1
We report the results of a multi-wavelength study in the North Ecliptic Pole (NEP) deep field and examine the far infrared-radio correlation (FIRC) for high and low redshift objects. We have found a correlation between the GMRT data at 610 MHz and the Herschel data at $\mathrm{250 \mu m}$ that has been usedto define a spectral index. This spectral index shows no evolution against redshift. As a result of the study, we show a radio colour-infrared diagram that can be used as a redshift indicator.