Transcript Document

A Study of the Correlation
between Galactic Distance and
Morphology
Harry Gaebler and Rebecca JensenClem
What is Redshift?
-The distances to 30 different galaxies were computed before camp
using redshift.
-Redshift is the movement of spectral lines toward the red end of the
spectrum as light from distant objects is stretched.
-Redshift can be used to calculate the recessional velocity of objects.
-After obtaining the recessional velocity of an object, one can
calculate its distance using Hubble's Law.
Sa Galaxy Redshift Results
-Galaxy
-NGC 3368
-NGC 4594
-NGC 3626
-NGC 2775
-NGC 488
-NGC 3898
-NGC 3593
-NGC 4698
-NGC 3281
-NGC 2639
-NGC 7217
Redshift Recessional V Distance
Z=0.003
900 km/s
39 Mly
Z=0.004
1200 km/s
52 Mly
Z=0.004977 1493.1 km/s 65 Mly
Z=0.0045
1350 km/s
59 Mly
Z=0.008
2400 km/s
104 Mly
Z=0.003929 1178.1 km/s 51 Mly
Z=0.002091 627.3 km/s
27 Mly
Z=0.003359 1007.7 km/s 44 Mly
Z=0.011475 3442.5 km/s 150 Mly
Z=0.010854 3256.2 km/s 142 My
Z=.003166
949.8 km/s
41 Mly
Sb Galaxy Redshift Results
-Galaxy
-NGC 5055
-NGC 3627
-NGC 3628
-NGC 3031
-NGC 891
-NGC 224
-NGC 2841
-NGC 4419
-NGC 1589
Redshift Recessional V Distance
Z=0.0028
851.2 km/s
37 Mly
Z=0.0027
810 km/s
35 Mly
Z=0.00282 846 km/s
37 Mly
Z=0.000997 299.1 km/s
13 Mly
Z=0.0018
540 km/s
23 Mly
Z=0.000192 57.6 km/s
2.5 Mly
Z=0.002121 636.3 km/s
27.6 Mly
Z=0.00399 1197 km/s
52 Mly
Z=0.012672 3801.6 km/s 165 Mly
Sc Galaxy Redshift Results
-Galaxy
-NGC 598
-NGC 5457
-NGC 5194
-NGC 628
-NGC 5236
-NGC 4321
-NGC 6946
-NGC 4244
-NGC 4631
-NGC 173
Redshift Recessional V Distance
Z=0.00023 69 km/s
3 Mly
Z=0.00207 621 km/s
27 Mly
Z=0.00238 714 km/s
31 Mly
Z=0.0023
690 km/s
30 Mly
Z=0.00115 345 km/s
15 Mly
Z=0.00524 1571 km/s
68 Mly
Z=0.00015 45 km/s
19 Mly
Z=0.0005
150 km/s
6.5 Mly
Z=0.00192 576 km/s
25 Mly
Z=.014637 4391.1 km/s 191 Mly
Redshift Results for Galaxies >35 Mly
Redshift Results for Galaxies <35 Mly
Our Camp Observations
We chose 4 different objects to observe with the CCD camera on the
61'' Kuiper Telescope
-NGC 6946 (Sc)
-NGC 7331 (Sb)
-NGC 7604 (Sa)
-NGC 7217 (Sa)
NGC 7217 (Sa)
NGC 7604 (Sa)
NGC 7331 (Sb)
NGC 6946 (Sc)
Photometry
~Adding up the brightnesses of the disk and the bulge gives the total
brightness of the galaxy
~ IRAF was used to reduce the data
~Integration of the disk and bulge data was the final step before
finding the distance
Finding the Distance
-(f1)(d1)^2=(f2)(d2)^2
-We used known redshifts as one of the distances in the equation
-Galaxy
Distance
Calculated Distance
Redshift
-6946
11 Mly
19 Mly
-7331
59 Mly
34 Mly
-7604
290 Mly
164 Mly
-7217
23 Mly
41 Mly