Hamstring injury threatens Russell’s Big Bash campaign

first_imgSYDNEY, Australia, (CMC): All-rounder AndrÈ Russell’s participation in the Big Bash was left in doubt after he suffered a hamstring injury in Sydney Thunder’s six-wicket victory over Melbourne Stars yesterday. The 29-year-old chased a ball to third man during the Stars’ innings, but pulled up metres before the boundary ropes, dropping to the ground and clutching his left hamstring. He was stretchered from the field and the Thunder franchise confirmed afterwards that the player had suffered a hamstring injury and would undergo scans to determine the extent of the damage. Russell was already set to undergo scans following the game to deal with a troublesome knee injury which has plagued him in recent games. He is the third West Indies star to be struck down by injury during the tournament. Last week, women’s all-rounder Deandra Dottin suffered multiple fractures of her cheekbone in an on-field collision with Brisbane Heat teammate Laura Harris and was forced to undergo surgery. A few days later, Dwayne Bravo sustained a serious hamstring injury while playing for Melbourne Renegades, attempting to pull off a save on the boundary. Jamaican Russell is the Thunder’s marquee player, but he is yet to produce a meaningful performance in the tournament as the reigning champions have struggled. In fact, yesterday’s win was Thunder’s first of the new tournament, breaking a four-game losing streak. Russell was restricted to a single over, which cost 10 runs, as Stars reached 166 for eight off 20 overs, with Englishman Kevin Pietersen top-scoring with 60 from 37 balls. England star Eoin Morgan then slammed an unbeaten 71 off 50 balls to propel Thunder to victory off the last ball of the innings. Requiring 15 runs off the final over, Morgan carted the final delivery down the ground for six, with four needed for victory.last_img read more

Sheriff Street/Mandela Avenue upgrade begins

first_imgRehabilitation work on the $6.4Billion Sheriff/Mandela Road upgrade project has begun.The project is being carried out in phases beginning with drainage works and the relocation of pipes/utilities. Acting Project Manager for the Donor Programme at the Ministry of Public Infrastructure, Mark Green told the Department of Public Information (DPI) that contractor Sinohydro Corporation Limited is currently cleaning all the canals and doing sand filling to facilitate the installation of the new pipes and fittings.“Once we complete the drains and pipe works we’ll then start the embankment work which is to excavate the earth with the sand, loam and crusher run. From then we’ll get a repaired surface on which we’ll build the sidewalks and parking lanes. Once that is completed then we will look to do the pavement rehabilitation,” Green explained.Once completed, Sheriff Street will remain a two-lane road while Mandela will be aActing Project Manager for the Donor Programme at the Ministry of Public Infrastructure, Mark Greenfour-lane. Green said the upgraded roads will be outfitted with new features including cycle lanes, separate sidewalks and smart traffic signals which will use above ground vehicle detectors.“Also, along the roadway, there’ll be a concrete median similar to that on Carifesta Avenue so you won’t have vehicles changing lanes randomly and colliding with other vehicles. In that median, there will be LED street lighting. At the four-lane from Mandela Avenue to the Hunter Street junction, the concrete median will be retained and a shared pedestrian and cyclist path will be included.”Additionally, two culverts at the junctions of David Street with the Cummings Canal and Lamaha Canal bridges will also be replaced. The wooden bridge atA section of the drainage works being done on the road upgrade projectHomestretch Avenue will be replaced with a concrete structure and other culverts will be extended. A pedestrian overpass and roundabout at the Sheriff Street-David Street junction are also included. Safety features include traffic signs and thermoplastic reflectors and road markings.The final phase of works will see the pavement upgraded and asphalted. All the entrances to side roads will be upgraded, however, side roads will not be rehabilitated. Most of the construction materials and equipment will be sourced locally.Work on the Inter-American Development Bank (IDB) venture is being executed with an eye to ensure minimal disruption to traffic and should wrap up within two years.last_img read more

Xray point source discovered at the center of a distant dwarf galaxy

first_img Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. HST image of Henize 2-10. The inset shows the new 160 ks Chandra observation with VLA radio contours from Reines et al. (2011) and has dimensions 600 × 400 (∼ 265 pc × 175 pc). Credit: Reines et al., 2016. Located some 34 million light years away in the constellation of Pyxis, Henize 2-10 is the first dwarf galaxy found to have a supermassive black hole at its center. With a mass of less than 10 billion solar masses, it is a compact starburst galaxy hosting numerous young “super star clusters” and a candidate low-luminosity active galactic nucleus (AGN).The presence of an AGN in Henize 2-10 offers an excellent opportunity to study massive black hole accretion and star formation. This is due to the fact that active nuclei in dwarf galaxies undergoing a burst of star formation reveal essential astronomical processes. They could offer crucial insights on the interplay between a massive black hole and the stars of the galaxy in which it forms.Last year, in February 2015, a team of astronomers led by Amy Reines of the University of Michigan conducted new Chandra observations of Henize 2-10 complementary to those performed in 2001. The new data obtained by the researchers allowed them to uncover the presence of a previously unidentified X-ray point source, spatially coincident with the known nuclear radio source in this dwarf galaxy.”Chandra clearly resolved the nuclear emission in Henize 2-10 and revealed the varying hard X-ray source to be due to a nearby X-ray binary, where a black hole, or a neutron star, eats material from a nearby typical star,” Mark Reynolds of the University of Michigan, co-author of the paper, told Phys.org.The fact that the new source is so bright allows the researchers to assume that the X-ray binary contains a “hungry” stellar-mass black hole that is eating very rapidly. They added that only very few X-ray binaries in our galaxy consume as much material as this source. However, the scientists still need to determine the cause of the variability observed from that source.”For example, it might be due to changes in the structure of the material it is eating. Another idea is that the variability could be driven by the time it takes the nearby star to orbit the stellar-mass black hole,” Reynolds said.This black hole in Henize 2-10 is potentially of great importance for astronomers, as it is the best-known example of a supermassive black hole in a dwarf galaxy. It is believed that early in the universe, relatively low-mass black holes grew in the initial galaxies that were small and gas-rich, such as Henize 2-10.”Thus, this provides critical insight into the early stages of galaxy and black hole evolution. Our new observations have shed light on the X-rays emitted from the nucleus of Henize 2-10. The massive black hole in this galaxy appears to be eating material in a similar manner to, for example, the supermassive black hole at the center of our Galaxy,” Reynolds concluded.The team plans to focus their future observations of Henize 2-10 on studying its supermassive black hole emission by observing when the X-ray binary is eating relatively slowly and is not bright. This could provide new information on the relationship between how this supermassive black hole eats material and the “burps” it gives off, and to determine how this influences star formation in this galaxy. © 2016 Phys.org (Phys.org)—NASA’s Chandra X-ray Observatory has helped astronomers to uncover a previously unidentified X-ray point source at the massive black hole in the center of a distant compact starburst galaxy known as Henize 2-10. The findings are available in a paper published Oct. 5 on the arXiv pre-print server. Citation: X-ray point source discovered at the center of a distant dwarf galaxy Henize 2-10 (2016, October 19) retrieved 18 August 2019 from https://phys.org/news/2016-10-x-ray-source-center-distant-dwarf.html Black hole hunters tackle a cosmic conundrum More information: Deep Chandra Observations of the Compact Starburst Galaxy Henize 2-10: X-rays from the Massive Black Hole, arXiv:1610.01598 [astro-ph.HE] arxiv.org/abs/1610.01598AbstractWe present follow-up X-ray observations of the candidate massive black hole (BH) in the nucleus of the low-mass, compact starburst galaxy Henize 2-10. Using new high-resolution observations from the Chandra X-ray Observatory totaling 200 ks in duration, as well as archival Chandra observations from 2001, we demonstrate the presence of a previously unidentified X-ray point source that is spatially coincident with the known nuclear radio source in Henize 2-10 (i.e., the massive BH). We show that the hard X-ray emission previously identified in the 2001 observation is dominated by a source that is distinct from the nucleus, with the properties expected for a high-mass X-ray binary. The X-ray luminosity of the nuclear source suggests the massive BH is radiating significantly below its Eddington limit (~10^-6 L_Edd), and the soft spectrum resembles other weakly accreting massive BHs including Sagittarius A*. Analysis of the X-ray light curve of the nucleus reveals the tentative detection of a ~9-hour periodicity, although additional observations are required to confirm this result. Our study highlights the need for sensitive high-resolution X-ray observations to probe low-level accretion, which is the dominant mode of BH activity throughout the Universe.last_img read more