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Vade Retro Satanas, Saggitarius-A is Crazy,
it does not dance the jig! |
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Introduction
Gravitational lenses are induced by massive objects. They can appear under
varius forms, especially in the form of "caustic".
In some of its effects,
gravitational optics is very close to
conventional optics.
It is through this phenomenon of caustic
that exoplanets can be detected.
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Detection of an exoplanet
During the transit of a planet through a caustic
generated by the mass of its star, its light is amplified and this
variation of luminosity, although weak, is measurable.
Thus, January 25th, 2006, ESO announces the
discovery of exoplannet
OGLE-2005-BLG-390
by
observing the luminosity change due to the passage
of this planet in a caustic due to
microlensing associated with its star.
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Questions |
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Could we see the same phenomenon between a super massive black hole
and the stars that revolve around?
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Then would we also see some visible deformations of
the stars elliptic trajectories by these lens effects?
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Were these phenomena already observed?
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In the the Milky Way Center,
Saggitarius A would host a Black Hole 4
million solar masses.
The black hole was "confirmed" by
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X ray
luminosity variations of Saggitarius A which would be
explained by the accretion of matter (accretion disc) to the black
hole.
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Some
511 Kev
emissions, evident marks of the
presence of antimatter.
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Source: ESO
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Around this black hole revolve numerous stars which it
was possible to
observe the movements (infrared light).
A Mpeg animation is available by clicking on the picture opposite.
These are the elliptical trajectories and velocities of these stars that
have enabled mass measurement of Saggitarius A.
It is found that:
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The trajectories of stars are perfectly elliptic.
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None of this star seems to manifest in their trajectories, a
significant brightness variation may reveal the passage in a
caustic and therefore the presence of a gravitational lens.
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What have become the
caustics ?
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A three dimensionnal reconstruction of the
trajectories of these stars, realized in the mpeg format by l'UCLA
Division of Astronomy and Astrophysics, is available by clicking
on the image opposite.
This reconstruction also shows the perfect
elliptic orbits.
Note that, due to the laws of relativity, additional
observations should reveal important variation of the perihelion of
these stars. These variations should confirm the mass of the
Black Hole.
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The 1st law of Képler and its
generalization |
Star Orbiting Massive Milky Way Centre
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In the heliocentric reference frame, the orbit of each planet is an
ellipse with one focus is occupied by the sun.
We can express this by saying that otherwise the sun and the planets are
rotating around their common center of gravity, which is located near the
center of the Sun, so inside it.
The same goes for stars rotating in the galactic center.
But for two objects, having
masses of the same order, the centre of gravity is situated outside of
these two objects. Both foci can be very close, they can even merge. (Circular
orbits).
Everything takes place as if these two objects turned around a
virtual object at
their centre of gravity.
If you add a star they always revolve around their common center of
gravity.
Then adding N stars, we have a set of stars that always revolve
around their common center of gravity, ie around a virtual object!
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The star cluster, M 13
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We then have the illusion of
the presence of a super massive object at the center of a star cluster.
(Open or globular clusters)
A
Virtual Massive Object would thus manifest itself in the centre of
the Milky Way. |
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Can a virtual object of 4 million solar masses
induce
a gravitational lens?
Yes because the
apparent
gravitational field is the same as if this mass were
physically present in the center of the star cluster. The trajectories and
speeds of stars demonstrate this.
Let us note
that the mass-luminosity relation of this virtual object would be
unconventional !
This does not remind you of dark matter story? |
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Question :
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Is there a black hole in the center of globular
clusters?
Considering the ages of the known globular clusters (10
billion years), the density of stars and the probability of star
collisions, a black hole should be present in the majority of them. But it
seems not be the case.
A Virtual Massive
Object would manifest it in globular clusters?
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Remarks and Conclusions: |
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Detection of the the Xray discovered is not
the proof of the existence of a Black Hole. There are other
possibilities.
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Neither is the 511 Kev radiation a proof of
the presence of a Black Hole. Other causes are possible.
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The gravitational Field being equivalent in both
cases, a variation of the périhélions of the orbits would also not be a proof in favour of the Black Hole.
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For the same reason, gravitational lens effects
would not also be a proof.
In all
globular clusters and in all galactic centres we can be in the
same ambiguous situation.
But indeed we are in the presence of a
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But this does not mean that Black
Holes don't exist:
§ In the case of Sgr A*
The ambiguity had already been lifted October 16, 2002 in a publication
of the ESO:
The motion of a star around the central black hole in the milky way.
The star "S2", which can be seen against the following path passed in
2002 with a speed of 5000 km/s to 17 light-hours of Sgr A * (less than
three times the Sun-Pluto distance). This measure clearly shows that it
is indeed a black hole, and not a globular cluster. (Source: Dr. Suzy Collin Zahn in an article published in Astronomy N° 70
/ March 2014 - pages 20-29
(SAF).
And in other
galaxies ?
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Source:
ESO
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Documentation |
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The central black hole of our Galaxy.
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Detection of hard X-ray emission from the Galactic nuclear
region with INTEGRAL.
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The source of antimatter from the galactic center.
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Early
SPI/INTEGRAL measurements of galactic 511 keV line. emission from
positron annihilation.
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Early SPI/INTEGRAL contraints on the morphology of the 511 keV line
emission in the 4th galactic quadrant.
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Hypernovae/GRB in the Galactic Center as possible sources of Galactic
Positrons.
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Creation date: 06/14/2007
Last release:
10.04.2016
(P. Schuler) |
A Bone in Andromede : |
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