photometric analysis with taos zipper mode data wang, tanya t.-y. supervisor : king, sun-kun
TRANSCRIPT
Photometric Analysis with TAOS Zipper Mode Data
Wang, Tanya T.-Y.
Supervisor : King, Sun-Kun
TAOS
TAOS Part 1 - Zipper-Mode image
row block 2048*32pixel
Our real image 2048*2048
Time interval : 0.3 secSteady state
2048*7200 pixel
Part 2 - Dealing with the Data (IDL)
Setup the file of each star which includes the information of it’s coordinates and magnitude
in our interesting region of sky.
Whole zipper-mode image row blocks.
Use Source Extractor to determine the magnitudes
of stars in all row blocks.
Use sky-list to collate the coordinates of stars in
each row block and put the same coordinates of
stars into a file.
TAOS
TAOS
Find special data point in our star files
Standard deviation.
curve(ΔX, ΔY , magnitude) : x-axis is the time sequence
which means the same star
in different time and y-axis is
the value of Δx (x-mx),
Δy (y-my), magnitude.
TAOS
TAOS
0 20 40 60 80 100
M
A
G
N
I
T
U
D
E
0 20 40 60 80 100
M
A
G
N
I
T
U
D
E
TAOS
TAOS
Zipper-mode image Row blocks
Using Source Extractor
Get a file including x, y and magnitudes of all stars in a row block.
x y mag1.1 1.2 131.3 4.5 9.0 . . . . . . . . . . . .2031 29.1 16
Star_1Star_2
Star_3
Star_n
row x y mag 0 9.1 4.2 13 1 9.09 4.1 12.9. . . . . . . . . . . . . . . . . n 9.12 4.15 13.1
File of star_5
Curve of x, y, mag
Part 3 - example010719_zipperc_a020.fit
Starc20_52
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a020.fitStarc20_60
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a020.fitStarc20_155
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a020.fitStarc20_186
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a020.fitStarc20_231
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a020.fitStarc20_239
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a025.fitStarc25_30
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a025.fitStarc25_190
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
010719_zipperc_a030.fitStarc30_36
TAOS
TAOS
ΔX
ΔY
MAGNITUDE
Four zipper-mode images
TAOS
TAOS
Total star
Possible
Data point
010719_zipperc_a020 192*95 7
010719_zipperc_a021 178*95 0
010719_zipperc_a025 190*95 4
010719_zipperc_a030 192*95 1
Part 4 - Future
Use another tool to determine the magnitude.
Eliminate background from our image – black frame.
Calibration
Improve the ability of tracking. 2-D cross correlation
An photometric analysis program in real-time.
TAOS
TAOS