Runaway star escaping Milky Way wasn't thrown out by galaxy's blackhole

A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.

Yousuf Khan

Technology Review: Blogs: arXiv blog: The Mystery of the Runaway Star
"Now there's a puzzle. Although astronomers have found several
hypervelocity runaways they've been able to measure the proper motion of
only one--HD 271791, a star about 11 times the mass of the sun and the
first known to be escaping our galaxy.

Knowing the proper motion is handy because it allows astronomers to
trace the trajectory of the star back to its origin.

The trouble is that when researchers do this for HD 271791, it leads to
the edge of the galactic disc, more than 3000 light years from the
supermassive black hole at the galactic centre. Whichever way you look
at it, that's bad news for Hills' theory."
http://www.technologyreview.com/blog/arxiv/24186/

Yousuf Khan wrote:

A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.

Anything past ~150 solar masses has a lifetime measured in millions of years
vs the typical billions+ for ~solar mass type stars. Problem is, among
others, that stars stopped getting that massive a very long time ago. Only
PopIII stars should get that big, and we're a bit past that time frame.

No nebula at any point along its' calculated path means either someone is
wrong about a calculation, or it wasn't related to a high mass star.


Yousuf Khan

Technology Review: Blogs: arXiv blog: The Mystery of the Runaway Star
"Now there's a puzzle. Although astronomers have found several
hypervelocity runaways they've been able to measure the proper motion of
only one--HD 271791, a star about 11 times the mass of the sun and the
first known to be escaping our galaxy.

Knowing the proper motion is handy because it allows astronomers to
trace the trajectory of the star back to its origin.

The trouble is that when researchers do this for HD 271791, it leads to
the edge of the galactic disc, more than 3000 light years from the
supermassive black hole at the galactic centre. Whichever way you look
at it, that's bad news for Hills' theory."
http://www.technologyreview.com/blog/arxiv/24186/

Now look for a nebula.

eric gisse wrote:
Yousuf Khan wrote:

A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.

Anything past ~150 solar masses has a lifetime measured in millions of years
vs the typical billions+ for ~solar mass type stars. Problem is, among
others, that stars stopped getting that massive a very long time ago. Only
PopIII stars should get that big, and we're a bit past that time frame.

No nebula at any point along its' calculated path means either someone is
wrong about a calculation, or it wasn't related to a high mass star.

It's possible that it encountered something else big along the way which
diverted its path, after its initial kick.

Yousuf Khan

On Sep 30, 4:02*pm, Yousuf Khan wrote:
A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.

* * * * Yousuf Khan

Technology Review: Blogs: arXiv blog: The Mystery of the Runaway Star
"Now there's a puzzle. Although astronomers have found several
hypervelocity runaways they've been able to measure the proper motion of
only one--HD 271791, a star about 11 times the mass of the sun and the
first known to be escaping our galaxy.

Knowing the proper motion is handy because it allows astronomers to
trace the trajectory of the star back to its origin.

The trouble is that when researchers do this for HD 271791, it leads to
the edge of the galactic disc, more than 3000 light years from the
supermassive black hole at the galactic centre. Whichever way you look
at it, that's bad news for Hills' theory."http://www.technologyreview.com/blog/arxiv/24186/

There's also RX J0822-4300 at 1500 km/sec (0.5 c) and only 6500 ly
distant, and this also means that by rights we should have noticed
some kind of shape deformation due to those GENERAL RELATIVITY and
SPECIAL RELATIVITY *THEORIES*. At least thus far and from our
terrestrial and satellite limited perspectives, RX J0822-4300 still
looks perfectly round/spherical.
http://chandra.harvard.edu/photo/200...is_epoch_2.jpg

In this following image each star seems as equally round/spherical,
even though one is supposedly moving at roughly 0.5 c away from the
other.
http://chandra.harvard.edu/photo/200...ppis_scale.jpg

And that’s not all that’s moving extremely fast, according to Nathan
Smith:
http://www.nature.com/nature/journal...ture07269.html
“Very massive stars shed much of their mass in violent precursor
eruptions as luminous blue variables (LBVs) before reaching their most
likely end as supernovae, but the cause of LBV eruptions is unknown.
The nineteenth-century eruption of Eta Carinae, the prototype of these
events, ejected about 12 solar masses at speeds of 650 km s-1, with a
kinetic energy of almost 10e50 erg (ref. 4). Some faster material with
speeds up to 1,000–2,000 km s-1 had previously been reported but its
full distribution was unknown. Here I report observations of much
faster material with speeds up to 3,500–6,000 km s-1, reaching farther
from the star than the fastest material in previous reports.”

Brad Guth, Brad_Guth, Brad.Guth, BradGuth, BG / “Guth Usenet”

Yousuf Khan wrote:

A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.
[snip]

Wouldn't have to be single 300 M(sun). Could have been a binary - and
that would further reduce the needed mass with a clever
gravitationally assisted slingshot.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2

Uncle Al wrote:
Yousuf Khan wrote:
A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.
[snip]

Wouldn't have to be single 300 M(sun). Could have been a binary - and
that would further reduce the needed mass with a clever
gravitationally assisted slingshot.

Well, actually they did mention the possibility of a complicated 3 or 4
star interaction as another possibility. I was just surprised by the
possibility of a 300 Msun star interaction. It was the possibility that
got my attention most.

Yousuf Khan

On Oct 1, 6:31*am, Yousuf Khan wrote:
Uncle Al wrote:
Yousuf Khan wrote:
A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.
[snip]

Wouldn't have to be single 300 M(sun). *Could have been a binary - and
that would further reduce the needed mass with a clever
gravitationally assisted slingshot.

Well, actually they did mention the possibility of a complicated 3 or 4
star interaction as another possibility. I was just surprised by the
possibility of a 300 Msun star interaction. It was the possibility that
got my attention most.

* * * * Yousuf Khan

If the star has dark matter of its own, it would gain speed. Say its
mass is less
than 10 times the mass of our Sun, but the remaining gravity is the
dark matter
component. Any dark matter halo is typically very small around stars,
but this
star may have it. As it goes and enters gravitational fields of other
stars and the
galaxy's gravitational field, it always ends up gaining speed in the
presence of other gravitational fields. Now probably something else
happens,
but such accelerating and coming out of gravitational fields faster
might explain
dark energy, and anti-gravity results from combusted gravity inside
and momentum
gain. If an object has more of the dark matter halo, it always gains
speed in random
gravitational interactions with its environment is my theory. Very
large stars may have
much more active planetary masses, like larger planets have much more
Moons.
A high orbit activity, and especially that such big stars tend to have
even smaller
suns as its planets might build high integral mass gains as a system,
but who knows.

On Oct 7, 10:46*am, gb wrote:
On Oct 1, 6:31*am, Yousuf Khan wrote:



Uncle Al wrote:
Yousuf Khan wrote:
A star 11 times the mass of the Sun is travelling at 1000 km/s, faster
than the galactic escape velocity. You'd think something that big may
have encountered the supermassive galactic black hole and been
slingshotted out. But it doesn't look like it. So what else is big
enough to slingshot such a massive star at that speed? One suggestion is
that it may have been a supermassive star of about 300 solar masses! I
thought the biggest you can get is 150 solar masses? Mysterious.
[snip]

Wouldn't have to be single 300 M(sun). *Could have been a binary - and
that would further reduce the needed mass with a clever
gravitationally assisted slingshot.

Well, actually they did mention the possibility of a complicated 3 or 4
star interaction as another possibility. I was just surprised by the
possibility of a 300 Msun star interaction. It was the possibility that
got my attention most.

* * * * Yousuf Khan

If the star has dark matter of its own, it would gain speed. Say its
mass is less
than 10 times the mass of our Sun, but the remaining gravity is the
dark matter
component. Any dark matter halo is typically very small around stars,
but this
star may have it. As it goes and enters gravitational fields of other
stars and the
galaxy's gravitational field, it always ends up gaining speed in the
presence of other gravitational fields. Now probably something else
happens,
but such accelerating and coming out of gravitational fields faster
might explain
dark energy, and anti-gravity results from combusted gravity inside
and momentum
gain. If an object has more of the dark matter halo, it always gains
speed in random
gravitational interactions with its environment is my theory. Very
large stars may have
much more active planetary masses, like larger planets have much more
Moons.
A high orbit activity, and especially that such big stars tend to have
even smaller
suns as its planets might build high integral mass gains as a system,
but who knows.

Jupiter as our very own sub-brown-dwarf has a substantial ring of dark
matter (mostly carbon), and its not going anywhere.

~ BG

gb wrote:
If the star has dark matter of its own, it would gain speed. Say its
mass is less
than 10 times the mass of our Sun, but the remaining gravity is the
dark matter
component. Any dark matter halo is typically very small around stars,
but this
star may have it. As it goes and enters gravitational fields of other
stars and the
galaxy's gravitational field, it always ends up gaining speed in the
presence of other gravitational fields. Now probably something else
happens,
but such accelerating and coming out of gravitational fields faster
might explain
dark energy, and anti-gravity results from combusted gravity inside
and momentum
gain.

All very interesting as theories go, except that dark matter has never
been seen to accumulate around a star. If there are 300 Ms stars out
there, then it's probably as a result of a merger between a couple of
150 Ms stars. Such a merger would in itself be quite a spectacular site,
perhaps a source of GRBs in its own right.

Yousuf Khan