News
Dust and radio waves have helped astronomers discover a connection between two key characteristics of galaxies
At the center of almost every known galaxy, including our Milky Way, is a supermassive black hole—black holes with the mass of millions or billions of our Sun. In some galaxies, there is also a lot of material at the center that feeds this supermassive black hole, making it “active.”
The most powerful type of such active galaxies are called quasars – they are among the brightest objects in the Universe. Most quasars appear “blue” due to a disk of material around them that feeds a supermassive black hole that radiates brightly in the optical and ultraviolet ranges.
However, astronomers have discovered that a significant portion of these quasars appear “red.” Understanding the physics of these red quasars requires spectroscopic measurements to analyze the quasar’s light in different wavelength ranges. The spectrum of a quasar can indicate the amount of dust in the space surrounding the central region. Observing radio emissions from quasars can also reveal evidence of a central supermassive black hole.
The study used spectroscopic observations from the DESI instrument, which was used to measure the amount of dust in a sample of about 35,000 quasars and relate the data to observed radio emission. The scientists found that DESI was able to observe much redder (dusty) quasars compared to similar previous spectroscopic studies, such as the Sloan Digital Sky Survey (SDSS). And also “red” quasars much more often have stronger radio emission compared to typical “blue” quasars.
Dr Fossett said: “This study puts many pieces of the red quasar puzzle together and links the dust in the quasar to its radio emissions. I think this is the strongest evidence yet that ‘red’ quasars are a key element in the evolution of galaxies.”
The connection between quasar reddening and radio emission is likely due to powerful outbursts of gas from the supermassive black hole colliding with surrounding dust, generating waves and radio emission. These ejections eventually carry away all the dust and gas from the central region of the galaxy, revealing the blue quasar and leading to a weakening of the radio emission.
This process fits with the increasingly popular idea that “red” quasars are a younger phase in the evolution of galaxies. Therefore, they quasars could be extremely important for understanding how galaxies evolve over time.
Hennessey has increased the power of the Cadillac Escalade-V SUV to the level of the Bugatti Veyron (from 1001 hp). Cadillac makes the all-electric Escalade IQ with 750 horsepower, but Hennessey has unveiled its own version of the gasoline SUV with a souped-up V engine.
Following on from the H650 package released earlier this year, the Texas tuner has introduced the 1,005 hp Hennessey Cadillac Escalade-V. with 1193 Nm of torque.
The standard Escalade-V’s 6.2-liter supercharged V8 produces 682 hp. and 853 Nm. The more powerful Hennessey version gets a high-performance air intake system, a special camshaft, an upgraded exhaust system, high-performance catalytic converters and new intake valves. The H1000 kit comes with a three-year/60,000km warranty.
The price of this version has not yet been announced.
Phones
Unboxing and live photos of Redmi K70E – the first smartphone on SoC MediaTek Dimensity 8300-Ultra
Yesterday Redmi officially presented the budget sub-flagship Redmi K70E, and today an unboxing of the device appeared on the Internet.
The photo shows a version of the Redmi K70E in Shadow Blue color – this is a shade of blue. How ITHome reviewers compare this color with jade.
The smartphone has a 6.67-inch screen with a very thin frame. Its width at the top and sides is only 1.3-1.35 mm – less than that of the iPhone 15 Pro. But at the bottom there is a larger frame – 2.27 mm.
The delivery set includes a branded case and a power supply that produces 90 W of power.
Let us remind you that Redmi K70E became the first smartphone based on the MediaTek Dimensity 8300-Ultra single-chip system. It is more powerful than the Snapdragon 7 Plus Gen 2, and this should guarantee the Redmi K70E first place in the new AnTuTu sub-flagship rating (two models on the Snapdragon 7 Plus Gen 2 are currently in the lead).
General Motors said its agreements with striking UAW and Canadian Unifor unions would increase costs by $9.3 billion through 2028. The company also announced a $10 billion share repurchase.
These data were announced after the signing of a new contract with the UAW, ratified earlier in November by a majority of 54.7% of the vote. The contract includes a 25 percent wage increase and future job security for union workers as they transition into electric vehicle production. The additional costs are about $575 per vehicle on top of the contract, which expires in 2028.
On Wednesday, November 29, GM said the six-week UAW strike had impacted its business, with earnings before interest and taxes estimated at $1.1 billion.
“We are finalizing a 2024 budget that fully offsets the additional costs of our new labor agreements, and the long-term plan we are executing includes reducing the capital intensity of the business, developing products even more efficiently and further reducing our fixed and variable costs,” she said. CEO Mary Barra said in a statement. “With this clear path forward and our strong balance sheet, we will return significant capital to shareholders.”
The American automaker plans to immediately repurchase and retire $6.8 billion of its common stock as part of a $10 billion buyback program. The remainder of the buybacks will occur before 2024.
GM also announced a 33 percent increase in its common stock dividend, from 9 cents to 12 cents per quarter. The increase is expected to take effect in early 2024.
V8 power like a Bugatti Veyron: Hennessey Cadillac Escalade-V presented
Hennessey has increased the power of the Cadillac Escalade-V SUV to the level of the Bugatti Veyron (from 1001 hp)....
Unboxing and live photos of Redmi K70E – the first smartphone on SoC MediaTek Dimensity 8300-Ultra
Yesterday Redmi officially presented the budget sub-flagship Redmi K70E, and today an unboxing of the device appeared on the Internet....
World’s Largest Auto Workers Strike Costs General Motors $9.3 Billion
General Motors said its agreements with striking UAW and Canadian Unifor unions would increase costs by $9.3 billion through 2028....
Another brightest smartphone screen in the world has been announced. Realme GT5 Pro will receive it, along with a top-end camera and Dolby Vision HDR support.
Realme has officially confirmed that the new Realme GT5 Pro smartphone will feature a BOE screen with a peak brightness...
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