When they die, these massive stars will make supernovae (SNe) and leave behind NS and BH remnants inside the disk.
Massive stars can be born in situ in an AGN accretion disk or be captured from the nuclear star cluster around the AGN (e.g., Artymowicz et al. Choked SGRBs in AGN disks are potential sources for future joint electromagnetic, neutrino, and gravitational wave multimessenger observations. For example, if the local event rate density of choked LGRBs in an AGN disk is ∼5% that of low-luminosity GRBs (∼10 Gpc −3 yr −1), the neutrinos from these events would contribute to ∼10% of the observed diffuse neutrino background. The contribution from choked LGRBs to the observed diffuse neutrino background depends on the unknown local event rate density of these GRBs in AGN disks. From a choked LGRB jet with isotropic equivalent energy of 10 53 erg at 100 Mpc, one expects ∼2(7) neutrino events detectable by IceCube (IceCube-Gen2). We find that these sources can effectively produce detectable TeV–PeV neutrinos through pγ interactions. Efficient shock acceleration of cosmic rays at the reverse shock is expected, and high-energy neutrinos would be produced. We show that GRB jets embedded in the migration traps of AGN disks are promised to be choked by the dense disk material. Automatic emergency braking is standard, but Porsche charges extra for other important safety equipment, such as blind-spot monitors, adaptive cruise control with stop-and-go capability, active lane control, night vision and a surround-view camera system.Both long-duration gamma-ray bursts (LGRBs) from the core collapse of massive stars and short-duration GRBs (SGRBs) from mergers of a binary neutron star or a neutron star–black hole are expected to occur in the accretion disk of active galactic nuclei (AGNs). Neither the NHTSA nor the IIHS has tested a 911, and likely never will.
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And the 4.7-cubic-foot front trunk isn't much for road trips.Ī Carrera S with a 7-speed manual transmission gets the best gas mileage, rated by the EPA at 18 mpg city, 25 highway, 21 combined. Technically there's a back seat, but it's barely big enough to consider a seat. The cockpit offers comfortable form-fitting bucket seats with lots of range, with heating and optional cooling. The performance of the Cabriolet and Targa nearly match the Coupe, adding their power tops that fold down at 30 mph or less. It's beyond adept at finding grip, and thanks to brilliantly matched electronic controls for shift speeds, damping, ride height, steering weight, and torque distribution, it doesn't feel complex or overdone. With struts and links and adaptive dampers and limited-slip differentials, the 911 picks a point on the horizon and screams toward it, on a run of handling glory. At its lightest, it weighs less than 3400 lb and handles with flat precision. The 911 measures 177.9 inches long, and rides on a 96.5-inch wheelbase, not much bigger than a Honda del Sol.
The transmission on most models is an 8-speed dual-clutch automatic manual, with all-wheel drive also coming on most models. Zero-to-60 mph times can be in the high three seconds, or as low as 2.6 seconds. It can be a mellow 379 hp or a monstrous 640 hp. The 3.0-liter turbocharged flat-6 engine makes different amounts of horsepower depending on the model and its state of tune.
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Some smaller news is that Android Auto is added to the infotainment system, whose interface is now like that in the Porsche Taycan, with more subscription services such as real-time traffic bundled into a three-year period. It's a 4.0-liter flat-6 with 502 hp and 346 lb-ft of torque. The big news in 2022 is that there is a new GT3, the only 911 that isn't turbocharged, making it the ultimate evolution of the old-school Porsche. The Porsche 911, with its heroic levels of grip and acceleration, is universally recognized as one of the best performance cars on the planet.
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