Visual and quantitative characterization of interacting GEMS galaxies at z = 0.7 in F606W (rest-frame 3400A)
Visual and quantitative characterization of interacting GEMS galaxies at z = 0.7 in F606W (rest-frame 3400A)
Project: Shardha Jogee and Undergraduate Kyle Penner

Analysis and Results


1) Gzipped tar file containing summary of method, results, tables, and figures. We assume throughout a Lambda_CDM flat cosmology with Omega_M = 0.3, Omega_Lambda = 0.7, and H0 = 70 km s-1 Mpc-1.

2) New Visual Morphological Classes (MC) are:
MC 61/63 = systems with pronounced/moderate BRIGHT morphological distortions
(where distortions include bright double nuclei, shells, arcs, tidal tails, etc.)
MC 62/64 = systems with pronounced/moderate FAINT morphological distortions
(where distortions include faint shells,arcs, tidal tails, etc.)
MC 65 = systems with no clear sign of morphological distortions.
MC 67 = systems that look like irregular galaxies rather than interacting galaxies. They often show 3 or more UV peaks (HII regions) within a larger disk.

3) Below are gifs of all 141 galaxies, subdivided by morphological class and CAS A :
61 63
62 64
65 67

Overall results




Morph. class 61

MC 61 = pronounced bright morphological disturbance.
Below are CAS asymmetry parameters (A) and F606W images of GEMS galaxies at z = 0.7, which we have visually classified into morphological class (MC) 61.
The first subset of images has A > 0.35 and the second subset has A < 0.35. The caption includes id, unique GEMS id, and A.
The images show ~210 x 210 pixels or 6.3" x 6.3", which corresponds to 45 kpc x 45 kpc at z = 0.7. At z = 0.7, F606W (pivot = 5916 A) corresponds to rest-frame far UV-B (pivot = 3479 A) images.

A > 0.35

1, 033130.05m275602.3, 0.540 2, 033320.18m273503.1, 0.479


A < 0.35

1, 033317.99m275805.0, 0.215 2, 033206.51m275658.9, 0.211 3, 033205.33m280300.2, 0.085


Overall results for morph. class 61




Morph. class 62

MC 62 = pronounced faint morphological disturbance.
Below are CAS asymmetry parameters (A) and F606W images of GEMS galaxies at z = 0.7, which we have visually classified into MC 62.
The first subset of images has A > 0.35 and the second subset has A < 0.35. The caption includes id, unique GEMS id, and A.
The images show ~210 x 210 pixels or 6.3" x 6.3", which corresponds to 45 kpc x 45 kpc at z = 0.7. At z = 0.7, F606W (pivot = 5916 A) corresponds to rest-frame far UV-B (pivot = 3479 A) images.

None with A > 0.35.

A < 0.35

1, 033249.36m273718.7, 0.318 2, 033309.10m275846.1, 0.318 3, 033130.47m275951.5, 0.310 4, 033151.63m275338.2, 0.289 5, 033131.29m275935.8, 0.248
6, 033231.35m274724.9, 0.217 7, 033236.50m274629.3, 0.180 8, 033221.21m273534.3, -0.040 9, 033154.04m275005.8, 0.000


Overall results for morph. class 62




Morph. class 63

MC 63 = moderate bright morphological disturbance.
Below are CAS asymmetry parameters (A) and F606W images of GEMS galaxies at z = 0.7, which we have visually classified into MC 63.
The first subset of images has A > 0.35 and the second subset has A < 0.35. The caption includes id, unique GEMS id, and A.
The images show ~210 x 210 pixels or 6.3" x 6.3", which corresponds to 45 kpc x 45 kpc at z = 0.7. At z = 0.7, F606W (pivot = 5916 A) corresponds to rest-frame far UV-B (pivot = 3479 A) images.

A > 0.35

1, 033219.95m273452.9, 0.488 2, 033152.30m273615.9, 0.462 3, 033223.03m275452.3, 0.448 4, 033212.25m274046.2, 0.439 5, 033136.90m274959.3, 0.438
6, 033149.02m273945.3, 0.427 7, 033320.72m274927.6, 0.424 8, 033257.96m274023.6, 0.366


A < 0.35

1, 033151.21m275037.6, 0.323 2, 033247.31m274247.9, 0.304 3, 033317.03m280126.4, 0.304 4, 033204.51m280153.5, 0.304 5, 033247.47m273926.2, 0.301
6, 033133.22m274208.7, 0.300 7, 033202.27m274007.3, 0.292 8, 033148.09m280232.2, 0.291 9, 033236.16m273955.7, 0.283 10, 033156.72m275636.1, 0.278
11, 033247.50m280258.6, 0.277 12, 033126.83m274249.9, 0.273 13, 033300.47m275908.5, 0.272 14, 033151.48m275024.5, 0.272 15, 033212.51m274454.7, 0.252
16, 033148.35m280315.8, 0.250 17, 033230.59m274518.1, 0.234 18, 033133.99m273718.0, 0.232 19, 033239.18m280208.8, 0.229 20, 033206.78m274921.6, 0.224
21, 033241.06m280250.8, 0.217 22, 033319.05m275658.8, 0.216 23, 033323.90m273931.3, 0.210 24, 033209.77m273525.6, 0.209 25, 033245.82m273443.3, 0.206
26, 033138.03m273658.0, 0.182 27, 033203.17m273839.7, 0.162 28, 033234.89m280045.7, 0.151 29, 033253.50m280333.9, 0.150 30, 033151.04m273933.3, 0.143
31, 033233.50m280040.0, 0.140 32, 033133.76m274822.0, 0.098 33, 033240.60m273715.8, 0.066 34, 033209.69m275600.5, -0.010 35, 033219.07m280252.8, 0.008


Overall results for morph. class 63




Morph. class 64

MC 64 = moderate to very subtle faint morphological disturbance.
Below are CAS asymmetry parameters (A) and F606W images of GEMS galaxies at z = 0.7, which we have visually classified into MC 64.
The first subset of images has A > 0.35 and the second subset has A < 0.35. The caption includes id, unique GEMS id, and A.
The images show ~210 x 210 pixels or 6.3" x 6.3", which corresponds to 45 kpc x 45 kpc at z = 0.7. At z = 0.7, F606W (pivot = 5916 A) corresponds to rest-frame far UV-B (pivot = 3479 A) images.

A > 0.35

1, 033250.20m275552.2, 0.422 2, 033154.75m275006.9, 0.372 3, 033134.43m274329.1, 0.365 4, 033149.20m274933.0, 0.358


A < 0.35

1, 033310.21m274305.3, 0.340 2, 033321.80m280344.3, 0.340 3, 033149.06m275359.5, 0.323 4, 033210.36m275332.8, 0.319 5, 033207.90m275329.6, 0.315
6, 033135.63m274701.5, 0.308 7, 033235.37m273519.1, 0.287 8, 033318.59m275900.5, 0.283 9, 033149.90m275018.2, 0.264 10, 033254.91m274038.0, 0.246
11, 033307.50m274201.3, 0.243 12, 033203.11m273933.2, 0.226 13, 033153.04m275606.7, 0.225 14, 033128.34m275634.3, 0.222 15, 033145.56m275625.8, 0.216
16, 033158.25m275456.6, 0.209 17, 033320.51m280034.9, 0.192 18, 033212.63m280054.5, 0.187 19, 033144.08m273627.2, 0.181 20, 033151.46m273945.5, 0.174
21, 033254.55m275905.5, 0.171 22, 033233.74m273612.5, 0.167 23, 033122.61m280105.5, 0.163 24, 033149.04m275402.2, 0.160 25, 033308.34m273858.4, 0.149
26, 033202.20m275500.0, 0.148 27, 033221.84m273824.9, 0.147 28, 033258.88m274806.0, 0.105 29, 033240.38m280342.8, 0.098 30, 033202.56m275231.3, 0.093
31, 033229.44m275538.2, 0.080 32, 033257.54m275908.8, 0.080 33, 033227.34m273850.9, 0.071 34, 033208.78m275058.5, 0.054 35, 033302.32m280032.9, -0.050
36, 033158.42m280318.7, 0.041 37, 033152.78m274928.5, -0.040 38, 033132.20m275045.9, 0.039 39, 033140.59m274019.6, 0.038


Overall results for morph. class 64




Morph. class 65

MC 65 = no clear sign of morphological disturbance.
Below are CAS asymmetry parameters (A) and F606W images of GEMS galaxies at z = 0.7, which we have visually classified into MC 65.
The first subset of images has A > 0.35 and the second subset has A < 0.35. The caption includes id, unique GEMS id, and A.
The images show ~210 x 210 pixels or 6.3" x 6.3", which corresponds to 45 kpc x 45 kpc at z = 0.7. At z = 0.7, F606W (pivot = 5916 A) corresponds to rest-frame far UV-B (pivot = 3479 A) images.

A > 0.35

1, 033230.93m274058.4, 0.564 2, 033132.05m274903.9, 0.436 3, 033229.64m274242.5, 0.429 4, 033145.47m275446.2, 0.360


A < 0.35

1, 033225.40m275633.8, 0.341 2, 033202.86m280237.2, 0.300 3, 033153.73m275422.1, 0.281 4, 033314.82m275919.8, 0.270 5, 033137.45m274145.3, 0.250
6, 033245.52m273840.2, 0.240 7, 033131.01m274140.1, 0.223 8, 033301.78m275225.8, 0.211 9, 033218.25m275225.0, 0.200 10, 033205.36m273532.6, 0.181
11, 033125.49m275518.1, 0.162 12, 033216.61m280039.2, 0.150 13, 033154.99m275651.2, 0.133 14, 033232.71m274859.5, 0.106 15, 033309.04m273943.8, 0.100
16, 033207.83m280144.6, 0.097 17, 033132.80m274608.7, 0.092 18, 033253.03m280153.3, 0.090 19, 033306.14m280204.3, 0.085 20, 033221.07m273529.9, 0.072
21, 033145.67m275438.0, 0.071 22, 033151.28m275828.5, 0.061 23, 033131.05m280145.3, 0.061 24, 033310.98m280316.0, 0.051 25, 033207.17m273456.9, 0.042
26, 033216.16m274941.6, 0.013 27, 033308.18m275033.1, -0.000


Overall results for morph. class 65




Morph. class 67

MC 67 = irregular galaxy with multiple UV peaks (HII regions) that appear to be distributed in rings or slightly irregular configurations within a larger underlying disk feature. These are different from double nuclei cases of 61 or 63.
Below are CAS asymmetry parameters (A) and F606W images of GEMS galaxies at z = 0.7, which we have visually classified into MC 67.
The first subset of images has A > 0.35 and the second subset has A < 0.35. The caption includes id, unique GEMS id, and A.
The images show ~210 x 210 pixels or 6.3" x 6.3", which corresponds to 45 kpc x 45 kpc at z = 0.7. At z = 0.7, F606W (pivot = 5916 A) corresponds to rest-frame far UV-B (pivot = 3479 A) images.

A > 0.35

1, 033221.19m273454.6, 0.553 2, 033236.78m273452.2, 0.373


A < 0.35

1, 033214.76m280013.3, 0.319 2, 033123.51m275602.7, 0.235 3, 033158.91m274712.1, 0.176 4, 033137.44m273643.1, 0.124 5, 033207.96m280103.1, 0.124
6, 033211.22m280245.8, 0.083 7, 033255.93m275356.9, 0.074 8, 033221.42m275616.9, 0.033


Overall results for morph. class 67



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