A Study of the Correlation between Galactic Distance and

Morphology

Harry Gaebler and Rebecca Jensen-Clem

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          Redshift     Recessional V     Distance-NGC 3368     Z=0.003          900 km/s          39 Mly-NGC 4594     Z=0.004          1200 km/s        52 Mly-NGC 3626     Z=0.004977     1493.1 km/s     65 Mly-NGC 2775     Z=0.0045        1350 km/s        59 Mly-NGC 488       Z=0.008          2400 km/s       104 Mly-NGC 3898     Z=0.003929     1178.1 km/s     51 Mly-NGC 3593     Z=0.002091     627.3 km/s       27 Mly-NGC 4698     Z=0.003359     1007.7 km/s     44 Mly-NGC 3281     Z=0.011475     3442.5 km/s     150 Mly-NGC 2639     Z=0.010854     3256.2 km/s     142 My-NGC 7217     Z=.003166       949.8 km/s        41 Mly

Sb Galaxy Redshift Results

-Galaxy          Redshift     Recessional V     Distance-NGC 5055     Z=0.0028        851.2 km/s       37 Mly-NGC 3627     Z=0.0027        810 km/s          35 Mly-NGC 3628     Z=0.00282      846 km/s          37 Mly-NGC 3031     Z=0.000997    299.1 km/s       13 Mly-NGC 891       Z=0.0018       540 km/s           23 Mly-NGC 224       Z=0.000192    57.6 km/s         2.5 Mly-NGC 2841     Z=0.002121    636.3 km/s        27.6 Mly-NGC 4419     Z=0.00399      1197 km/s         52 Mly-NGC 1589     Z=0.012672     3801.6 km/s     165 Mly

Sc Galaxy Redshift Results

-Galaxy          Redshift     Recessional V     Distance-NGC 598       Z=0.00023      69 km/s           3 Mly-NGC 5457     Z=0.00207      621 km/s         27 Mly-NGC 5194     Z=0.00238      714 km/s         31 Mly-NGC 628       Z=0.0023        690 km/s        30 Mly-NGC 5236     Z=0.00115      345 km/s        15 Mly-NGC 4321     Z=0.00524      1571 km/s       68 Mly-NGC 6946     Z=0.00015      45 km/s           19 Mly-NGC 4244     Z=0.0005       150 km/s           6.5 Mly-NGC 4631     Z=0.00192      576 km/s          25 Mly-NGC 173       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                        Calculated Distance                Redshift Distance

-6946                            11 Mly                                  19 Mly

-7331                            59 Mly                                  34 Mly

-7604                            290 Mly                                164 Mly

-7217                            23 Mly                                  41 Mly