A Study of the Correlation between Galactic Distance and Morphology

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A Study of the Correlation between Galactic
Distance and Morphology

• Harry Gaebler and Rebecca Jensen-Clem

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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.

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Sa Galaxy Redshift Results

• -Galaxy          Redshift     Recessional V   
   Distance-NGC 3368     Z0.003          900
  km/s          39 Mly-NGC 4594     Z0.004     
      1200 km/s        52 Mly-NGC 3626   
   Z0.004977     1493.1 km/s     65 Mly-NGC 2775
      Z0.0045        1350 km/s        59 Mly-NGC
  488       Z0.008          2400 km/s       104
  Mly-NGC 3898     Z0.003929     1178.1 km/s    
  51 Mly-NGC 3593     Z0.002091     627.3 km/s 
       27 Mly-NGC 4698     Z0.003359     1007.7
  km/s     44 Mly-NGC 3281     Z0.011475   
   3442.5 km/s     150 Mly-NGC 2639     Z0.010854
      3256.2 km/s     142 My-NGC 7217    
  Z.003166       949.8 km/s        41 Mly

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Sb Galaxy Redshift Results

• -Galaxy          Redshift     Recessional V   
   Distance-NGC 5055     Z0.0028        851.2
  km/s       37 Mly-NGC 3627     Z0.0027       
  810 km/s          35 Mly-NGC 3628     Z0.00282
       846 km/s          37 Mly-NGC 3031    
  Z0.000997    299.1 km/s       13 Mly-NGC 891  
      Z0.0018       540 km/s           23 Mly-NGC
  224       Z0.000192    57.6 km/s         2.5
  Mly-NGC 2841     Z0.002121    636.3 km/s       
  27.6 Mly-NGC 4419     Z0.00399      1197 km/s  
        52 Mly-NGC 1589     Z0.012672     3801.6
  km/s     165 Mly

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Sc Galaxy Redshift Results

• -Galaxy          Redshift     Recessional V   
   Distance-NGC 598       Z0.00023      69
  km/s           3 Mly-NGC 5457     Z0.00207     
  621 km/s         27 Mly-NGC 5194     Z0.00238
       714 km/s         31 Mly-NGC 628      
  Z0.0023        690 km/s        30 Mly-NGC 5236
      Z0.00115      345 km/s        15 Mly-NGC
  4321     Z0.00524      1571 km/s       68
  Mly-NGC 6946     Z0.00015      45 km/s       
     19 Mly-NGC 4244     Z0.0005       150 km/s  
          6.5 Mly-NGC 4631     Z0.00192      576
  km/s          25 Mly-NGC 173      
  Z.014637      4391.1 km/s     191 Mly

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Redshift Results for Galaxies gt35 Mly
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Redshift Results for Galaxies lt35 Mly
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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)

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NGC 7217 (Sa)
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NGC 7604 (Sa)
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NGC 7331 (Sb)
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NGC 6946 (Sc)
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Photometry

• Adding up the brightnesses of the disk and the
  bulge gives the total brightness of the galaxy
  IRAF was used to reduce the dataIntegration of
  the disk and bulge data was the final step before
  finding the distance

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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