School social work education and welfare collaboration; a case study of school social work practice

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Discovery of the First Low-Luminosity Quasar at z > 7

We report the discovery of a quasar at z = 7.07, which was selected from the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. This quasar, HSC J124353.93+010038.5, has an order of magnitude lower luminosity than do the other known quasars at z > 7. The rest-frame ultraviolet absolute magnitude is M1450 = -24.13 +/- 0.08 mag and the bolometric luminosity is Lbol = (1.4 +/- 0.1) x 10^{46} erg/s. Its spectrum in the optical to near-infrared shows strong emission lines, and shows evidence for a fast gas outflow, as the C IV line is blueshifted and there is indication of broad absorption lines. The Mg II-based black hole mass is Mbh = (3.3 +/- 2.0) x 10^8 Msun, thus indicating a moderate mass accretion rate with an Eddington ratio 0.34 +/- 0.20. It is the first z > 7 quasar with sub-Eddington accretion, besides being the third most distant quasar, known to date. The luminosity and black hole mass are comparable to, or even lower than, those measured for the majority of low-z quasars discovered by the Sloan Digital Sky Survey, and thus this quasar likely represents a z > 7 counterpart to quasars commonly observed in the low-z universe.Comment: Accepted for publication in ApJ Letter

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 7.0

The American Astronomical Society, find out more The Institute of Physics, find out more THE FOLLOWING ARTICLE ISOPEN ACCESS Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 7.0 Yoshiki Matsuoka1, Kazushi Iwasawa2, Masafusa Onoue3, Nobunari Kashikawa4,5,6, Michael A. Strauss7, Chien-Hsiu Lee8, Masatoshi Imanishi5,6, Tohru Nagao1, Masayuki Akiyama9, Naoko Asami10Show full author list Published 2019 October 3 © 2019. The American Astronomical Society. The Astrophysical Journal, Volume 883, Number 2 DownloadArticle PDF DownloadArticle ePub Figures Tables References Download PDFDownload ePub 674 Total downloads 99 total citations on Dimensions. Turn on MathJax Share this article Share this content via email Share on Facebook Share on Twitter Share on Google+ Share on Mendeley Article information Abstract We report the discovery of 28 quasars and 7 luminous galaxies at 5.7 ≤ z ≤ 7.0. This is the tenth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the deep multiband imaging data produced by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. The total number of spectroscopically identified objects in SHELLQs has now grown to 93 high-z quasars, 31 high-z luminous galaxies, 16 [O iii] emitters at z ~ 0.8, and 65 Galactic cool dwarfs (low-mass stars and brown dwarfs). These objects were found over 900 deg2, surveyed by HSC between 2014 March and 2018 January. The full quasar sample includes 18 objects with very strong and narrow Lyα emission, whose stacked spectrum is clearly different from that of other quasars or galaxies. While the stacked spectrum shows N v λ1240 emission and resembles that of lower-z narrow-line quasars, the small Lyα width may suggest a significant contribution from the host galaxies. Thus, these objects may be composites of quasars and star-forming galaxies

Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0

We present the spectroscopic discovery of 69 quasars at 5.8 0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with PQB 5.6. This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low luminosity population down to M 1450 ∼-21 mag.Y.M. was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI grant No. JP17H04830, No. 21H04494, and the Mitsubishi Foundation grant No. 30140. K.I. acknowledges support by the Spanish MCIN under grant PID2019-105510GB-C33/AEI/10.13039/501100011033 and "Unit of excellence María de Maeztu 2020-2023" awarded to ICCUB (CEX2019-000918-M)

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6

UTokyo FOCUS Articles掲載「超遠方宇宙に大量の巨大ブラックホールを発見 すばる望遠鏡の最新鋭カメラで稀少天体を発見」 https://www.u-tokyo.ac.jp/focus/ja/articles/z0508_00112.htmlUTokyo FOCUS Articles "Old black holes in a young universe : Astronomers reveal supermassive black holes were common in the early universe" https://www.u-tokyo.ac.jp/focus/en/articles/z0508_00037.htm

Genetic differences between C57BL/6 substrains affect the process of testis differentiation in Y-POS mice

C57BL/6J-XYPOS (B6J-XYPOS) mice, which have the Y chromosome derived from Mus musculus poschiavinus on a B6J genetic background, form ovotestes or ovaries. Previously, we replaced the genetic background of B6J-XYPOS mice with B6N and found that individuals with testes also appeared in addition to those with ovaries or ovotestes. To investigate the effect of the B6J genetic sequence on the testis differentiation, the genetic background of B6N-XYPOS mice was replaced with B6J again. The recovery of the B6J genetic background significantly decreased the incidence of testes; only ovaries developed. These results indicate that the testicular differentiation process tends to be perturbed especially in the B6J substrain. This shows the importance of substrain differences in mice usually treated as B6 collectively

Can multiple-degree-of-freedom articulating instruments be effective in pediatric endoscopic surgery? - A prospective trial

Background: Pediatric endosurgery often requires intracorporeal suturing, including reverse or vertical needle driving, which is difficult using a conventional instrument because of limited degrees of freedom (DOFs). To address this, multiple-DOF (mDOF) articulating instruments (mDOF-AIs) have been developed. We therefore evaluated the usefulness of mDOF-AIs compared with conventional instruments. Methods: ARTISENTIALⓇ (LivsMed, Seongnum-si, Republic of Korea) was used as the mDOF-AI. Forty medical students were randomly divided into groups using conventional or mDOF articulating graspers to compare their proficiency with three-dimensional peg transfer. Task completion time and number of errors (dropping a peg) were evaluated. In addition, among pediatric surgeon participants, the number of practice times taken to reach the goal (completion of peg transfer within two minutes and vertical suturing) was measured. After achieving the goal, three vertical sutures of laparoscopic hepaticojejunostomy of the simulator were performed using the conventional and mDOF articulating needle-driver. The task completion time and quality of suturing were then evaluated. Results: Forty medical students were enrolled. The mDOF group showed significantly longer task completion times but significantly fewer errors than the conventional group (0.7 vs. 1.4 times, p = 0.03). Six pediatric surgeons achieved the goal in 42.5 min of practice on average. Using the mDOF articulating needle-driver, laparoscopic hepaticojejunostomy took significantly longer than with the conventional needle-driver (1120 vs. 856 s, p<0.01); however, the suturing quality improved significantly. Conclusion: The quality of basic and advanced endoscopic procedures using mDOF-AIs was higher than that with conventional instruments. mDOF-AIs potentially have safe and accurate performance