My Question

What are the colors of the galaxies in the Hubble Ultra Deep Field?

Background InformationAn elliptical galaxy is

A spiral galaxy is

Hubble Ultra Deep Field

0

9

18

< -1

01(-

100)

-(-91

)(-9

0)-(-

81)

(-80)

-(-71

)(-7

0)-(-

61)

(-60)

-(-51

)(-5

0)-(-

41)

(-40)

-(-31

)(-3

0)-(-

21)

(-20)

-(-11

)(-1

0)-0

1-10

11-2

021

-30

31-4

041

-50

51-6

061

-70

12

1 1

3

6

4

6

4

14

18

13

16

10

6

3

Spiral

Colors of Galaxies in HUDF

Color Numbers

Num

ber

ofG

alax

ies

0

9

18

< -1

01(-

100)

-(-91

)(-9

0)-(-

81)

(-80)

-(-71

)(-7

0)-(-

61)

(-60)

-(-51

)(-5

0)-(-

41)

(-40)

-(-31

)(-3

0)-(-

21)

(-20)

-(-11

)(-1

0)-0

1-10

11-2

021

-30

31-4

041

-50

51-6

061

-70

6

2

7

54

6

16

7

16

12

8 8

13

7

12

Elliptical

Colors of Galaxies in HUDF

Color Numbers

Num

ber

ofG

alax

ies

0

3.6

7.2

10.8

14.4

18

< -1

01(-10

0)-(-

91)

(-90)

-(-81

)(-8

0)-(-

71)

(-70)

-(-61

)(-6

0)-(-

51)

(-50)

-(-41

)(-4

0)-(-

31)

(-30)

-(-21

)(-2

0)-(-

11)

(-10)

-01-

1011

-20

21-3

031

-40

41-5

051

-60

61-7

0

1

6

221

7

1

543

6 6

16

4

76

16

4

12

14

8

18

8

1313

16

7

10

6

1

32

Spiral

Elliptical

Colors of Galaxies in HUDF

Color Numbers

Num

ber

ofG

alax

ies

Analysis

• For 106 spiral galaxies and 124 elliptical galaxies, I subtracted the Green values from the Blue values in Photoshop.

• Ex: A spiral galaxy’s blue value=150, and its green value=156. 150-156=(-6)

Final Conclusion

• I found that elliptical galaxies tend to have lower/negative number values than spiral galaxies that tend to have higher number values.