by neufer » Fri Oct 29, 2021 10:07 pm
Ann wrote: ↑Fri Oct 29, 2021 7:27 pm
Are you sure that's a dog, Orin?
It looks more like a cat to me!
https://en.wikipedia.org/wiki/National_Cat_Day wrote:
<<In the US, National Cat Day is an awareness day to raise public awareness of cat adoption, taking place on October 29. The day was founded in 2005 by Colleen Paige, a pet and family lifestyle expert, who was supported by the ASPCA, which is a nonprofit pet adoption organization.>>
https://en.wikipedia.org/wiki/S5_0014%2B81 wrote:
<<S5 0014+81 is a distant, compact, hyperluminous, broad-absorption-line quasar, or blazar, located near the high declination region of the constellation Cepheus. In 2009, a team of astronomers using the Swift spacecraft used the luminosity of S5 0014+81 to measure the mass of its black hole. They found it to be about 10,000 times more massive than the black hole at the center of our galaxy, or equivalent to 40 billion solar masses. This makes it more than six times the value of the black hole of Messier 87, which was thought to be the largest black hole for almost 60 years, and was coined to be an "ultramassive" black hole. The Schwarzschild radius of this black hole is 800 AU, or about 20 times the radius of Pluto's orbit. The fact that such a large black hole existed so early in the universe, at only 1.6 billion years after the Big Bang, suggests that supermassive black holes formed very quickly.
S5 0014+81 is one of the most luminous quasars known with a total luminosity of over 10
41 watts, equal to an absolute bolometric magnitude of −31.5. If the quasar were at a distance of 280 light-years from Earth, it would give out as much energy per square meter as the Sun does at Earth, despite being 18 million times more distant. The quasar's luminosity is therefore about 300 trillion times the Sun, or over 25,000 times as luminous as all the 100 to 400 billion stars of the Milky Way combined, making it one of the most powerful objects in the observable universe. However, because of its huge distance of 12.1 billion light-years it can only be studied by spectroscopy. The central black hole of the quasar devours an extremely huge amount of matter, equivalent to 4,000 solar masses of material every year. The quasar is also a very strong source of radiation, from gamma rays and X-rays down to radio waves.>>
[quote=Ann post_id=317849 time=1635535650 user_id=129702]
Are you sure that's a dog, Orin? :puppy:
It looks more like a cat to me! :kitty: [/quote][quote=https://en.wikipedia.org/wiki/National_Cat_Day]
[float=left][img3=""]https://upload.wikimedia.org/wikipedia/en/b/bc/Garfield_the_Cat.svg[/img3][/float]
<<In the US, National Cat Day is an awareness day to raise public awareness of cat adoption, taking place on October 29. The day was founded in 2005 by Colleen Paige, a pet and family lifestyle expert, who was supported by the ASPCA, which is a nonprofit pet adoption organization.>>[/quote][quote=https://en.wikipedia.org/wiki/S5_0014%2B81]
[float=left][img3=S5 0014+81's black hole > 6 X the mass/diameter of of Messier 87's black hole]https://upload.wikimedia.org/wikipedia/commons/4/4f/Black_hole_-_Messier_87_crop_max_res.jpg[/img3][/float]<<S5 0014+81 is a distant, compact, hyperluminous, broad-absorption-line quasar, or blazar, located near the high declination region of the constellation Cepheus. In 2009, a team of astronomers using the Swift spacecraft used the luminosity of S5 0014+81 to measure the mass of its black hole. They found it to be about 10,000 times more massive than the black hole at the center of our galaxy, or equivalent to 40 billion solar masses. This makes it more than six times the value of the black hole of Messier 87, which was thought to be the largest black hole for almost 60 years, and was coined to be an "ultramassive" black hole. The Schwarzschild radius of this black hole is 800 AU, or about 20 times the radius of Pluto's orbit. The fact that such a large black hole existed so early in the universe, at only 1.6 billion years after the Big Bang, suggests that supermassive black holes formed very quickly.
S5 0014+81 is one of the most luminous quasars known with a total luminosity of over 10[sup]41[/sup] watts, equal to an absolute bolometric magnitude of −31.5. If the quasar were at a distance of 280 light-years from Earth, it would give out as much energy per square meter as the Sun does at Earth, despite being 18 million times more distant. The quasar's luminosity is therefore about 300 trillion times the Sun, or over 25,000 times as luminous as all the 100 to 400 billion stars of the Milky Way combined, making it one of the most powerful objects in the observable universe. However, because of its huge distance of 12.1 billion light-years it can only be studied by spectroscopy. The central black hole of the quasar devours an extremely huge amount of matter, equivalent to 4,000 solar masses of material every year. The quasar is also a very strong source of radiation, from gamma rays and X-rays down to radio waves.>>[/quote]