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Tulip Nebula and Black Hole Cygnus X-1

Explanation: When can you see a black hole, a tulip, and a swan all at once? At night -- if the timing is right, and if your telescope is pointed in the right direction. The complex and beautiful Tulip Nebula blossoms about 8,000 light-years away toward the constellation of Cygnus the Swan. Ultraviolet radiation from young energetic stars at the edge of the Cygnus OB3 association, including O star HDE 227018, ionizes the atoms and powers the emission from the Tulip Nebula. Stewart Sharpless cataloged this nearly 70 light-years across reddish glowing cloud of interstellar gas and dust in 1959, as Sh2-101. Also in the featured field of view is the black hole Cygnus X-1, which to be a microquasar because it is one of strongest X-ray sources in planet Earth's sky. Blasted by powerful jets from a lurking black hole, its fainter bluish curved shock front is only faintly visible beyond the cosmic Tulip's petals, near the right side of the frame.

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APOD Robot wrote: ↑Wed Aug 28, 2024 4:05 am Tulip Nebula and Black Hole Cygnus X-1

[...] Blasted by powerful jets from a lurking black hole, its fainter bluish curved shock front is only faintly visible beyond the cosmic Tulip's petals, near the right side of the frame.

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The cross marks the location of the black hole Cygnus X-1 in this radio image. The bright region to the left (east) of the black hole is a dense cloud of gas existing in the space between the stars, the interstellar medium. (Image credit: Gallo et al., Westerbork radio telescope) https://www.space.com/1441-black-hole-f ... ubble.html Background: NASA/ESA & more (DSS2color)

AVAO wrote: ↑Wed Aug 28, 2024 4:40 am

APOD Robot wrote: ↑Wed Aug 28, 2024 4:05 am Tulip Nebula and Black Hole Cygnus X-1

[...] Blasted by powerful jets from a lurking black hole, its fainter bluish curved shock front is only faintly visible beyond the cosmic Tulip's petals, near the right side of the frame.

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Click to view full size image 1 or image 2

The cross marks the location of the black hole Cygnus X-1 in this radio image. The bright region to the left (east) of the black hole is a dense cloud of gas existing in the space between the stars, the interstellar medium. (Image credit: Gallo et al., Westerbork radio telescope) https://www.space.com/1441-black-hole-f ... ubble.html Background: NASA/ESA & more (DSS2color)

Wonderful image as always, Jac!

Your image strongly suggests that the Tulip Nebula and Cygnus X-1 are close enough to be connected. I checked the Gaia parallaxes for HD 227018 (the ionizing star of the Tulip Nebula) and HD 226868 (the star orbiting the black hole of Cygnus X-1), and they are indeed very similar. Their parallaxes suggest that their distances are 7,200-7,300 light-years.


We may note that the yellow-looking HD 226868 is really a highly reddened blue supergiant star of spectral class B0. Another interesting aspect is the fact that the jet from Cygnus X-1 (and ensuing lobe and bow shock) appears to be one-sided. The blue OIII arc of Cygnus X-1 is located to the northwest (upper right) of the stellar/black hole system itself.

I am reminded of the mostly one-sided jet from the enormous black hole of giant elliptical galaxy M87.


We can't see the jet of Cygnus X-1, but it must clearly be there.


Ann

Exciting APOD and contributions by Ann and AVAO!
So, a blue supergiant star feeds a microquasar - how will this all end? The star goes supernova leaving behind two black holes eventually merging? The microquasar swallows the whole star? In any case, illustrations are just illustrations but here is the one from the Chandra site for Cygnus X-1, what a spectacular vision of intense energies!

Quasar, IIRC, stands for quasi-stellar object, something very bright but whose light was anomalously red shifted. They were thought to be at the luminous limits of distance we could see at the time. Now we have a star which is a microquasar? So is M87 then a miniquasar in its core? The term seems to be applicable to whatever the person wants to talk about.

Roy wrote: ↑Wed Aug 28, 2024 7:58 pm Quasar, IIRC, stands for quasi-stellar object, something very bright but whose light was anomalously red shifted. They were thought to be at the luminous limits of distance we could see at the time. Now we have a star which is a microquasar? So is M87 then a miniquasar in its core? The term seems to be applicable to whatever the person wants to talk about.

A quasar is a very energetic object resulting from an accretion disk around a supermassive black hole. A microquasar depends on very similar physics, but is the product of an accretion disk around a stellar mass black hole. Two completely separate populations (as there is no overlap between stellar mass and supermassive black holes).