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Light Detectives
Limb of Sun
Brown dwarf
Very low mass star
Light Detectives – #2
Brown dwarf
Jupiter
Light Detectives – #3
W1 = 3.4 microns
W2 = 4.6 microns
W3 = 12 microns2
Regular Stars Brown Dwarfs
(more green [W2], less blue [W1])
Light Detectives – #4
Light Detectives – #5
Light Detectives – #6
Light Detectives – #7
• A finder chart
shows you where
to find objects in
the sky.
• The same objects
will appear in
each of the WISE
images you
download.
Light Detectives – #8
W1 = 3.4 microns
W2 = 4.6 microns
W3 = 12 microns2
Regular Stars Brown Dwarfs
(more green [W2], less blue [W1])
Light Detectives – #9
Sample color-color diagram for brown dwarf search
W2/W1 vs W3/W2
0.8
6
0.7
1
2
2
0.6
3
W2/W1
4
5
9
0.5
6
38
0.4
11
7
1
5
4
8
10
9
7
12
10
11
0.3
12
0.2
0.05
0.1
0.15
0.2
W3/W2
Light Detectives – #10
0.25
0.3
0.35
5
• Brown dwarfs have
LOW intensity in W1.
AGB Stars
4
• Brown dwarfs are
relatively BRIGHT in
W2 light.
W2/W1
3
• What objects have
high W2/W1 ratios?
Brown Dwarfs
2
ULIRGs
• What objects have
higher W3/W2 ratios
than brown dwarfs?
1
0
Stars
0
Normal Galaxies
1
2
3
4
5
W3/W2
Light Detectives – #11
6
7
8
9
Light Detectives – #12
Light Detectives – #13
• A finder chart
shows you where
to find objects in
the sky.
• The same objects
will appear in
each of the WISE
images you
download.
Light Detectives – #14
Sample color-color diagram for ULIRG search
W2/W1 vs W3/W2
1.2
1
11
2
1.0
3
4
W2/W1
0.8
5
6
0.6
7
0.4
27 3
10
84
61 12
59
8
9
10
0.2
11
0.0
0.0
1.0
2.0
3.0
W3/W2
Light Detectives – #15
4.0
5.0
6.0
12
Light Detectives – #16
Light Detectives – #17