Transcript Meet An Astronomer!

X-Ray Vision
Why is it important to
progress to bigger and
better telescopes?
ROSAT All Sky Survey
Chandra
Hubble
Look at this level of detail!
Criteria #1
Look for objects
that have x-ray
sources near the
center!
Terzan 12
IC 1276
NGC 6171
NGC 4833
NGC 6541
NGC 6717
Lynga 7
Terzan 3
NCG 6362
NGC 6749
TON 2
NGC 6273
NGC 6723
NGC 6287
Looking at X-ray sources
 Objects sometimes have more than 1 x-ray
source.
 Now look to see which sources are closest to
the centers of the globular clusters.
NGC 6541
2
1
NGC 6717
1
2
Lynga 7
3
2
4
5
6
1
NGC 6749
1
TON 2
5
1
2
3
4
6
NGC 6273
5
4
3
1
2
NGC 6723
6
7
2
1
3
4
5
NGC 6287
6
3
5
4
2
1
To: [email protected]
From: [email protected]
Re: X-ray source information
Dear Dr. Morris,
Here are the 10 x-ray sources that we would like more information on:
NGC 6541 Source 1
NGC 6717 Sources 1-2
Lynga 7 Sources 1-4
NGC 6749 Source 1
Ton 2 Source 1
NGC 6723 Source 1
We need the additional information ASAP because we only have 20 minutes of class left.
Thank you!
Mrs. Tykoski’s 7th Period Class
To: [email protected]
From: [email protected]
Re: X-ray source information
Hi there! The next thing you want to look for is the number of photons (energy
packets) in the 3 groups. X-ray astronomers divide these photons into 3
groups: high energy photons, medium energy photons, and low energy
photons. The best x-ray sources will have similar numbers of photons in all 3
of these bands.
I’m attaching this information for 9 of the 10 sources you requested. We had a
telescope malfunction when looking at NGC 6723. You need to narrow
down your list to 3 X-ray sources for me to send on to Chandra. I will need
your recommendation by today.
Cheers,
Dr. David Morris
Criteria #2
 Look for sources that have
similar numbers in the low,
medium, and high energy
bands in the X-ray
NGC 6541 Source 1
18
16
14
12
10
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6541 Source 2
3.5
3
2.5
2
1.5
1
0.5
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6717 Source 1
9
8
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
Lygna 7 Source 1
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
Lygna 7 Source 2
9
8
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
Lygna 7 Source 3
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
Lygna 7 Source 4
3.5
3
2.5
2
1.5
1
0.5
0
number of low energy photons
number of medium energy photons
number of high energy photons
Lygna 7 Source 5
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
Lygna 7 Source 6
20
18
16
14
12
10
Series1
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6749 Source 1
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6717 Source 2
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
TON 2 Source 1
8
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
TON 2 Source 2
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
TON 2 Source 3
140
120
100
80
60
40
20
0
number of low energy photons
number of medium energy photons
number of high energy photons
TON 2 Source 4
9
8
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
TON 2 Source 5
12
10
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
TON 2 Source 6
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6273
Source 1
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6273
Source 2
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6273
Source 3
18
16
14
12
10
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6273
Source 4
12
10
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6273
Source 5
50
45
40
35
30
25
20
15
10
5
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6287
Source 1
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6287
Source 2
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6287
Source 3
18
16
14
12
10
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6287
Source 4
14
12
10
8
6
4
2
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6287
Source 5
8
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
NGC 6287
Source 6
8
7
6
5
4
3
2
1
0
number of low energy photons
number of medium energy photons
number of high energy photons
To: [email protected]
From: [email protected]
Re: Final recommendation
Dear Dr. Morris,
Here are the 3 x-ray sources that we recommend for
Chandra:
Lygna 7 Source 4
Lygna 7 Soruce 3
NGC 6717 Source 1
We hope we made good picks!
To: [email protected]
From: [email protected]
Re: Final recommendation
Wow! I’m really impressed with how much data reduction you did in such a
short period of time! Thank you for helping me out with this. I’ll send the
recommendations to Chandra!
Cheers,
Dr. David Morris
Survey
List one thing you learned about x-ray astronomy from this activity
List one thing that you thought worked well during this activity.
List one Improvement for this activity (constructive comments only!)