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FastFourierTransform
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Intergalactic stars!

13 Oct 2017 08:57

- INTERGALACTIC STARS ADDON -

INSTALLATION:
To install the addon you must put the attached file  "Integalactic stars.sc" in your SpaceEngine/addons/catalogs/stars folder (create the path if you don't have it).

DESCRIPTION:
The addon cointains 74 catalogued stars that lie in the intergalactic space near the Milky Way. Some of these stars are Carbon stars, Blue horizontal branch stars, Blue stragglers and RR Lyrae variables.

NOTES:
In the classical definition an intergalactic star is a "star that is not gravitationally bound to the galaxy", but here I prefer to define them as "stars that are at least as far as the Milky Way's largest satellite galaxies (the Large Magellanic Cloud, 163.000 ly away, and the Small Magellanic Cloud, 200.000 ly away), without been in either of those". The stars been at least 200 kly away from the Milky Way ensures that they do not pertain to certain galactic streams and that they in fact live in the extreme outer halo or in intergalactic space. Also in the classical definition there could be stars that are currently inside the galaxy but are members of the Hyper Velocity Star (HVS) population (and thus they are gravitationally unbound to the galaxy even if currently residing inside of it). So this addon contains several HVS but not all of them (even if they might reach the appropiate distances in the future if they live long enought). Also this addon includes stars that are bound to the Milky Way but are extremely far away (which would not have been included in the classical definition of intergalactic stars). Also not all the stars in the addon have been ejected from the Milky Way (for example HE 0437-5439 is an intergalactic star believed to have orginated in the Large Magellanic Cloud).

The current record holder for the farthest known intergalactic star from the Milky Way is ULAS J001535.72+015549.6. It's nearly a million light years away, that is 4.5 times the distance to the Magellanic Clouds and 35% the distance from here to the Andromeda galaxy (just in another direction).


IN THE FUTURE:
I will update the addon in the future so it cointains stars closer but still way over the galactic disc to show some stellar streams and other regions of the outer halo.


Image

Image

Image

Image


Stars between 200 kly and 400 kly from the Sun:

85-TARG3
196.000 ly away
Scientific source

HE 0437-5439
200.000 ly away
Scientific source

2MASS J13121645+0834359
202.000 ly away
Scientific source

85-TARG7
202.000 ly away
Scientific source

HiTS 101529-012126
205.000 ly away
Scientific source

CRTS J101056.8-033322
205.000 ly away
Scientific source

2MASS J13340081+0755186
205.000 ly away
Scientific source

2MASS J08483725+1046564
206.000 ly away
Scientific source

2MASS J21423432-0919008
206.000 ly away
Scientific source

2MASS J17075009+2026169
207.000 ly away
Scientific source

HVS 4
209.000 ly away
Scientific source

88-TARG2
212.000 ly away
Scientific source

2MASS J04493236+1824389
212.000 ly away
Scientific source

HVS 12
215.000 ly away
Scientific source

85-TARG15
231.000 ly away
Scientific source

85-TARG2
235.000 ly away
Scientific source

HVS 9
241.000 ly away
Scientific source

2MASS J16322935+0625245
242.000 ly away
Scientific source

2MASS J15093678-0826173
242.000 ly away
Scientific source

2QZ J105544.7-013441
248.000 ly away
Scientific source

2MASS J22223330-1035483
258.000 ly away
Scientific source

2MASS J07200228+3242158
268.000 ly away
Scientific source

85-TARG33
271.000 ly away
Scientific source

HiTS 112524-024348
271.000 ly away
Scientific source

2MASS J12512804+3332253
272.000 ly away
Scientific source

HiTS 112859-034415
271.000 ly away
Scientific source

HiTS 100956+013212
271.000 ly away
Scientific source

88-TARG5
280.000 ly away
Scientific source

HiTS 101243+022118
284.000 ly away
Scientific source

85-TARG34
287.000 ly away
Scientific source

2MASS J11291239+2858152
301.000 ly away
Scientific source

2MASS J10123429-0134408
303.000 ly away
Scientific source

HiTS 110739+012813
303.000 ly away
Scientific source

HiTS 105754-002603
303.000 ly away
Scientific source

2MASS J11291470+2858144
318.000 ly away
Scientific source

2MASS J07120119+3242548
321.000 ly away
Scientific source

HiTS 104009-063304
326.000 ly away
Scientific source

HVS 1
333.000 ly away
Scientific source

2MASS J14324588+1901238
334.000 ly away
Scientific source

2MASS J07215455+3330195
339.000 ly away
Scientific source

HVS 13
342.000 ly away
Scientific source

HiTS 103943-021726
352.000 ly away
Scientific source

HiTS 111106-041718
369.000 ly away
Scientific source

2MASS J17255439+0300265
375.000 ly away
Scientific source

88-TARG7
378.000 ly away
Scientific source

88-TARG100
381.000 ly away
Scientific source

2MASS J08001687+3209491
386.000 ly away
Scientific source

88-TARG3
388.000 ly away
Scientific source

MLS J074237.7+225819
398.000 ly away
Scientific source



Stars beyond 400 kly:

2MASS J17255439+0300265
411.000 ly away
Scientific source

88-TARG8
434.000 ly away
Scientific source

HiTS 105209-043942
444.000 ly away
Scientific source

2MASS J00341245-0131545
464.000 ly away
Scientific source

2MASS J22462850-2726583
473.000 ly away
Scientific source

2MASS J00523741-0336460
473.000 ly away
Scientific source

EPIC 210282473
479.000 ly away
Scientific source

88-TARG34
492.000 ly away
Scientific source

2MASS J09054635+2024381
499.000 ly away
Scientific source

EPIC 210282472
509.000 ly away
Scientific source

HiTS 103601-015451
525.000 ly away
Scientific source

HiTS 102414-095518
525.000 ly away
Scientific source

2MASS J13011847+0029507
525.000 ly away
Scientific source

HiTS 113107+021302
532.000 ly away
Scientific source

2MASS J00363234-2254510
538.000 ly away
Scientific source

HiTS 113105+021319
561.000 ly away
Scientific source

HiTS 113057+021331
561.000 ly away
Scientific source

HiTS 110222-001624
587.000 ly away
Scientific source

HiTS 104054-042827
597.000 ly away
Scientific source

2MASS J08492507+2058552
671.000 ly away
Scientific source

HiTS 104054-042827
714.000 ly away
Scientific source

HiTS 102014-042354
760.000 ly away
Scientific source

ULAS J074417.48+253233.0
776.000 ly away
Scientific source

HiTS 104738+020627
855.000 ly away
Scientific source

ULAS J001535.72+015549.6
893.000 ly away
Scientific source
Attachments
Intergalactic Stars.sc
(8.21 KiB) Downloaded 22 times
 
A-L-E-X
Star Engineer
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Posts: 1665
Joined: 06 Mar 2017

Intergalactic stars!

13 Oct 2017 10:20

yay an exciting add on!  Maybe in the future you can add the 3C Cambridge Catalog and I can finally get to see my favorite quasar- 3C 273!  I assume we can't move time forward and see the hypervelocity stars zooming away can we?  Do we have any rogue planets too?
 
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FastFourierTransform
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Intergalactic stars!

13 Oct 2017 10:56

A-L-E-X wrote:
Source of the post I assume we can't move time forward and see the hypervelocity stars zooming away can we?

A-L-E-X, as always, no. We have discussed about this in the work in progress thread and in the Gaia mission thread several times (we = you and me). There is no stellar motion implemented in the code of SpaceEngine for now and to do it there are many many problems to solve before so it won't be possible at least for a few years.

What I can do maybe is a script in python that when a date is given (let's say 5 Myr from now) it generates a file with the new positions for the Hypervelocity stars. If I do it (it could be possible only for a few stars) you would still have to 1) install python, 2) run my script, 3) generate the file for the date you plugged, 4) put the file in the corresponding folder and 5) reboot space engine (all of this for each year you want to see).

A-L-E-X wrote:
Source of the post Do we have any rogue planets too?

No, we currently don't know about any solitary intergalactic planet in the known universe (there has to be but we haven't observed any yet).
In fact even planets around intergalactic stars are probably very very very scarce since for those stars to gain the velocity needed to overcome the gravitational pull of their galaxies their planetary systems have to be disrupted by the ejection. Supernova companions that can kick stars, gravitational slingshots with black holes and binary-bynary interactions are all disruptive mechanisms for the planets that those stars had in the past. The only possible scenario is by been thrown away by galactic collisions (stars in stellar streams shouldn't be totally depleted of planets in my opinion).

Well it looks like I have the first reccomendation for a more realistic addon in the next update (erase all planets from this addon should be done).

A-L-E-X wrote:
Source of the post Maybe in the future you can add the 3C Cambridge Catalog and I can finally get to see my favorite quasar- 3C 273

Well, first of all quasars are not currently modeled in SE so no, the addition is impossible for now.
The only thing that can be done here is a catalogue of galaxies using 3C redshift measurements and sky coordinates, but those would be just normal galaxies until SE is capable of showing Active Galactic Nucleai and Jet streams.

Second, what this has to do whatsoever with intergalactic objects or even stars?
 
A-L-E-X
Star Engineer
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Posts: 1665
Joined: 06 Mar 2017

Intergalactic stars!

13 Oct 2017 13:23

FastFourierTransform wrote:
A-L-E-X wrote:
Source of the post I assume we can't move time forward and see the hypervelocity stars zooming away can we?

A-L-E-X, as always, no. We have discussed about this in the work in progress thread and in the Gaia mission thread several times (we = you and me). There is no stellar motion implemented in the code of SpaceEngine for now and to do it there are many many problems to solve before so it won't be possible at least for a few years.

What I can do maybe is a script in python that when a date is given (let's say 5 Myr from now) it generates a file with the new positions for the Hypervelocity stars. If I do it (it could be possible only for a few stars) you would still have to 1) install python, 2) run my script, 3) generate the file for the date you plugged, 4) put the file in the corresponding folder and 5) reboot space engine (all of this for each year you want to see).

A-L-E-X wrote:
Source of the post Do we have any rogue planets too?

No, we currently don't know about any solitary intergalactic planet in the known universe (there has to be but we haven't observed any yet).
In fact even planets around intergalactic stars are probably very very very scarce since for those stars to gain the velocity needed to overcome the gravitational pull of their galaxies their planetary systems have to be disrupted by the ejection. Supernova companions that can kick stars, gravitational slingshots with black holes and binary-bynary interactions are all disruptive mechanisms for the planets that those stars had in the past. The only possible scenario is by been thrown away by galactic collisions (stars in stellar streams shouldn't be totally depleted of planets in my opinion).

Well it looks like I have the first reccomendation for a more realistic addon in the next update (erase all planets from this addon should be done).

A-L-E-X wrote:
Source of the post Maybe in the future you can add the 3C Cambridge Catalog and I can finally get to see my favorite quasar- 3C 273

Well, first of all quasars are not currently modeled in SE so no, the addition is impossible for now.
The only thing that can be done here is a catalogue of galaxies using 3C redshift measurements and sky coordinates, but those would be just normal galaxies until SE is capable of showing Active Galactic Nucleai and Jet streams.

Second, what this has to do whatsoever with intergalactic objects or even stars?

FFT I thought there might be a way just to model the motion of these hypervelocity stars, apart from what can be done in SE for anything else.  Almost like an animation of sorts?  Not to model every object, but just these select ones that move very quickly.
FFT aren't there rogue planets traveling at faster than the escape velocity of the galaxy and will leave the galaxy in a few thousand years?  I remember reading something about that.
There were a few quasars in SE, I remember looking for a few very distant objects and finding them- one of them was called LMASS something or other (don't remember the rest of the name).  There are actually quasar-like objects within our own galaxy, one well known one was discovered a few years ago, I forgot the name of that one.
As always, thanks for your great work- just throwing some additional ideas out there! :-)
 
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FastFourierTransform
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Joined: 17 Nov 2016

Intergalactic stars!

21 Oct 2017 11:54

I don't want to get more off-topic here but since you ask I'm going to try to answer.

A-L-E-X wrote:
Source of the post FFT I thought there might be a way just to model the motion of these hypervelocity stars, apart from what can be done in SE for anything else.  Almost like an animation of sorts?  Not to model every object, but just these select ones that move very quickly.

I mean, this is a question for SpaceEngineer not for me. I don't know if it's possible and if it makes sense with the current developement of the code. The only thing I remember that Vladimir explained a few years ago was that this is not possible until a radical change in the core of the engine is made. Currently SE works like this: SE takes the coordinates of a point in space and uses it as a seed for a procedurall algorithm that generates (or not) the star, the system, and each of the characteristics. If it where another coordinate then the system would be generated in an entirely different way because the seed would be different. This has to be done like this because if the system parameters were not generated procedurally with a seed like this it would mean that you would probably have to store the information of the system in advance for eacho of the billions and billions of objects depicted in SE.
The stars can't procedurally move for now because of this. They would change coordinates and the seed would be different each time. If you think about it it can be very complex issue.

The other thing is the importance of this. I mean, I'm totally hyped by the ideo of having stellar motion in SE one day but making it for hypervelocity stars or making it for the rest of stars is not very different. The problem is the same. You also need to realize that in the case of hypervelocity stars even if the motion is huge you don't really have any close references to appreciate a huge motion. Ypu would see the galaxy like that, in the background for millions of years without much change in size. Better to implement all the scenarios and not only hypervelocity.

A-L-E-X wrote:
Source of the post FFT aren't there rogue planets traveling at faster than the escape velocity of the galaxy and will leave the galaxy in a few thousand years?  I remember reading something about that.

I mean, yeah sure. There should be billions of intergalactic planets (probably much more than stars since stars die). The fact is that we haven't discovered any for now, so no catalogued ones can be added. Yeah it would be nice to have intergalactic planets when the engine is prepared to handle intergalactic stars. Maybe this is not that difficoult to add in the future.

A-L-E-X wrote:
Source of the post There were a few quasars in SE, I remember looking for a few very distant objects and finding them- one of them was called LMASS something or other (don't remember the rest of the name).

Ok. I thought the same a few years ago. But no in reality quasars are not yet implemented in Space Engine as HarbingDawn explained here. Quasars in SE are just an experiment yet to be worked. SE only shows a bipolar nebula object, not the full active galactic nuclei, with the jet streams that span galactic scales and other things that makes quasars what they are.

A-L-E-X wrote:
Source of the post There are actually quasar-like objects within our own galaxy, one well known one was discovered a few years ago, I forgot the name of that one.

There are micro-quasars in the galaxy, but these have nothing to do with quasars as astrophysical objects. Don't be misslead by the similarity of the name. Is almost like comparing a galactic disk with a protoplanetary disk. Yeah both are disks but not the same thing at all.

A-L-E-X wrote:
Source of the post As always, thanks for your great work- just throwing some additional ideas out there! :-)

I'm glad you liked it ;)
 
A-L-E-X
Star Engineer
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Joined: 06 Mar 2017

Intergalactic stars!

26 Jan 2018 13:33

Thanks FFT, I'm eagerly awaiting the next iteration of the program :)
 
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Quarior
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Intergalactic stars!

27 Jan 2018 09:26

Oh, nice mod. I hope we can see procedural intergalactic star.
PS : Your thread, is normal is create in Feedback and Suggestions or is just a error ?
► Information
 
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Palauan
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Intergalactic stars!

08 Jul 2018 11:19

Very Nice!
 
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Palauan
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Intergalactic stars!

08 Jul 2018 11:48

You should make an addon with the most distant galaxies.
 
vlad01
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Intergalactic stars!

09 Jul 2018 01:05

Thanks for the great addon! Enjoying exploring these systems.

scr00095.jpg
 
Thimenu
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Joined: 19 Jul 2018
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Intergalactic stars!

19 Jul 2018 11:12

[quote="FastFourierTransform"][center][color=#8e44ad][size=200]- INTERGALACTIC STARS ADDON -[/size][/color][/center]

[...]

[/quote]


This is awesome! I can't wait for this kind of thing to be added officially.
 
ipagewebsite
Observer
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Joined: 14 Dec 2016

Intergalactic stars!

14 Nov 2018 13:37

Anyone know if it's possible to find some of these stars in Space Engine? HE 0437-5439, ULAS J074417.48 + 253233.0 and ULAS J001535.72 + 015549.6. How do I find them, since in f3 they do not appear? They were mentioned in this forum, but I could never find them.
 
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Mosfet
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Intergalactic stars!

14 Nov 2018 15:28

ipagewebsite wrote:
Source of the post How do I find them, since in f3 they do not appear?

You'll not find them unless you install the mod right on top of this page.
"Time is illusion. Lunchtime doubly so". Douglas N. Adams
My mods | My specs: Asus x555ub - cpu i5-6200u, ram 4gb, gpu nvidia geforce 940m 2gb vram | IRC freenode.net canale ##SpaceEngineITA
 
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N0B0DY
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Intergalactic stars!

14 Nov 2018 22:48

Why is this addon in this section and not in the Mods&addons section of the forum?

There is also a warning in the console about a duplicate entry at line 74 (in the "All known Outer halo and Extragalactic stars" section):
► Show Spoiler

The same star is also present at line 54 of the "Stars farther than 200.000 ly and closer than 400.000 ly" section, but with slightly different RA, Dec, Dist and AppMagn values:
► Show Spoiler
 
ipagewebsite
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Intergalactic stars!

27 Nov 2018 13:24

[quote="Mosfet"][quote="ipagewebsite"][post]24405[/post] How do I find them, since in f3 they do not appear?[/quote]
You'll not find them unless you install the mod right on top of this page.[/quote]

Nice! I found and installed Mod

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