The configuration of galaxies in space

Click For Summary
SUMMARY

The discussion focuses on the spatial configuration of the Milky Way and Andromeda galaxies, specifically their alignment in relation to each other and other nearby galaxies. The Milky Way lies in a defined plane, while the Andromeda Galaxy's position is debated, with coordinates indicating it is slightly below this plane. Users are directed to utilize databases such as the NASA/IPAC Extragalactic Database (NED) for galactic coordinates and to visualize these galaxies using planetarium software like Celestia. The importance of understanding celestial coordinates for interpreting galaxy positions is emphasized.

PREREQUISITES
  • Understanding of celestial coordinates and their interpretation
  • Familiarity with galactic coordinate systems (longitude and latitude)
  • Knowledge of local group galaxies and their spatial relationships
  • Experience with planetarium software, specifically Celestia
NEXT STEPS
  • Research how to interpret celestial coordinates using the NASA/IPAC Extragalactic Database (NED)
  • Learn about the local group of galaxies and their configurations
  • Explore the use of planetarium software like Celestia for visualizing galactic positions
  • Investigate the significance of galactic latitude and longitude in astronomy
USEFUL FOR

Astronomers, astrophysics students, and anyone interested in the spatial relationships and configurations of galaxies, particularly those studying the Milky Way and Andromeda galaxies.

PainterGuy
Messages
938
Reaction score
73
TL;DR
How to find the alignments for different galaxies in sky? If they are horizontally aligned, vertically aligned, or skewed or tilted when viewed from Earth.
Hi,

In the picture below, M is Milky Way Galaxy in red, both A's are Andromeda Galaxy in positions P1 and P2 , and W is some random galaxy.

Milky Way Galaxy lie in one plane just like all the planets in solar system. In what configuration Andromeda Galaxy lies? Does it lie almost at the same level as Milky Way Galaxy? For example, the W galaxy lies in almost in the same plane as Milky Way. Does Andromeda lie in position P1 up above the Milky Way but its plane alignment is the same as Milky Way? Or, does Andromeda lie in position P2 where it's aligned along z-axis?

Wikipedia page, https://en.wikipedia.org/wiki/Andromeda_Galaxy, does give the coordinates, capture at the bottom, for it but I don't know how to interpret celestial coordinates, and if celestial coordinates convey any info about its alignment.
1646123696150.png


1646124986503.png
 
Astronomy news on Phys.org
You could search for information and images of the "local group of galaxies".
 
  • Like
Likes   Reactions: PainterGuy and phinds
For nearby galaxies PeroK's suggestion would be the easiest and most intuitive.

If you want to picture any galaxy in general, you can go to a database of extragalactic objects, such as this one: https://ned.ipac.caltech.edu/ and search for the name of the object (common name, designation in Messier, NGC, anything should do). Keep in mind the database queries may take a few seconds to process.
It'll display a set of data, including galactic coordinates (latitude and longitude). Galactic coordinates allow for easy picturing where in relation to the plane of the Milky Way does any object lie.
The longitude (l) and latitude (b) are measured like so:
1646142609195.png

With galactic north being towards the constellation of Coma Berenices and 90 deg longitude in the direction of the Sun's orbital motion through the galaxy, roughly towards the star Deneb.

E.g. for Andromeda the database returns l=121 b=-22 so it's a bit below the plane and a bit away from the galactic centre.

Another visualisation option is to use a planetarium software (e.g. Celestia), and find galactic coordinate grid in the display options before searching for the object.
Or, of course, going out at night and finding where the object lies w/r to the band of the Milky Way (i.e. its plane) and its centre in Sagittarius.How much an object is oriented edge-on or face-on can usually be readily seen from the pictures.
 
  • Like
Likes   Reactions: PainterGuy and PeroK
PeroK said:
You could search for information and images of the "local group of galaxies".
I did try to search for some images but it didn't make much sense and wanted to get a general idea to know the orientation and alignment of a galactic plane.

I think the following image comes close to it. One can Andromeda from Earth and its center is also visible,

1646190114095.png

Source: https://ourplnt.com/andromeda-brighter/
 
We were thinking something more like this:
1646233931346.png
 
  • Like
Likes   Reactions: PainterGuy

Similar threads

  • · Replies 30 ·
2
Replies
30
Views
5K
  • · Replies 19 ·
Replies
19
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 142 ·
5
Replies
142
Views
135K
  • · Replies 24 ·
Replies
24
Views
1K
  • · Replies 4 ·
Replies
4
Views
7K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 65 ·
3
Replies
65
Views
6K