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. What is Redshift?. - PowerPoint PPT PresentationTRANSCRIPT
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