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wiki:PS-vs-SDSS

Sample Galaxies

  • 144 galaxies were selected with size in the range 0 and 2 arcmin. The size distribution is chosen to be uniform.
  • The photometry results for both SDSS and Pan-STARRS are displayed in the below table. (please scroll down)
  • To make a better comparisons, all of those galaxies with noisy images, or bad data were removed. 19 galaxies were then removed. These information and the results for these galaxies are available on the below table. These galaxies are PGC [40761,23519,64552,62651,60049,24469,90968,61254,4010299,38457,142843,91191,39833,48409,1672298,1305231,61220,60436,53891].
  • After removing these galaxies, we are left with 125 galaxies.
  • The comparison between SDSS and Pan-STARRS photometry results. In most cases it's obvious that Pan-STARRS photometry turns out fainter magnitudes. It's due to the background oversubtraction, and unfortunately this does not depend on the size of the galaxy.

  • The same plots for r-band

  • This plot compare g-r colors in terms of size. No correlation with galaxy size is apparent. The color discrepancy is roughly around 0.1 mag. Since SDSS photometry accuracy is around 0.05 mag at best (color accuracy of ~0.07), then this plot indicates a color accuracy of about 0.15 mag at best.
  • Also one has to note that out of 144 galaxies 19 (13%) have been removed due to data quality (mostly Pan-STARRS).

  • This shows the g-band image of PGC90968 (RA:149.70750 deg DEC:0.83650 deg). Left: Pan-STARRS postage-stamp image. Clearly you can see the footprint of each individual chip (2.5*2.5 arcmin2). Also there is a dark area on top of the galaxy which passes through the galaxy. Right: SDSS data for the same galaxy.

  • The i-band image of PGC59376 (RA:254.78625 DEC:28.99200). There are a few odd dark region passing through the galaxy. the background noise is not uniformly distributed. Dark edges around the galaxy indicate background over subtraction. These feature are more-or-less available in most cases and that's the reason Pan-STARRS returns fainter results.
  • This table summarizes all the results.
no PGC d25 g.sdss r.sdss profile images note-sdss * g.ps r.ps profile images note-Pan-STARRS *
1 45947 1.95 13.28 12.55 ​profile ​images * 13.31 12.62 ​profile ​images *
2 21684 1.95 14.13 13.59 ​profile ​images * 14.13 13.57 ​profile ​images *
3 34718 1.91 13.82 13.36 ​profile ​images * 13.91 13.43 ​profile ​images *
4 43863 1.91 14.32 13.48 ​profile ​images * 14.37 13.54 ​profile ​images saturated center *
5 34913 1.91 13.95 13.09 ​profile ​images * 13.89 13.04 ​profile ​images *
6 30818 1.91 13.96 13.41 ​profile ​images * 14.15 13.59 ​profile ​images *
7 41958 1.91 13.50 12.79 ​profile ​images * 13.53 12.86 ​profile ​images *
8 37429 1.91 12.50 11.90 ​profile ​images * 12.66 12.07 ​profile ​images *
9 41020 1.86 14.73 14.48 ​profile ​images * 14.87 14.57 ​profile ​images *
10 19652 1.82 14.75 14.05 ​profile ​images * 14.71 14.09 ​profile ​images *
11 9510 1.82 14.74 14.00 ​profile ​images * 14.65 14.00 ​profile ​images *
12 43517 1.82 14.14 13.38 ​profile ​images * 14.13 13.46 ​profile ​images saturated center *
13 47971 1.82 13.30 12.72 ​profile ​images * 13.32 12.78 ​profile ​images *
14 23169 1.82 14.26 13.49 ​profile ​images * 14.22 13.47 ​profile ​images *
15 43837 1.86 12.75 12.23 ​profile ​images * 12.85 12.33 ​profile ​images background oversubtraction *
16 37723 1.86 12.89 12.45 ​profile ​images * 13.05 12.65 ​profile ​images bad background *
17 39366 1.74 13.84 13.48 ​profile ​images * 13.88 13.48 ​profile ​images *
18 52167 1.78 14.35 13.98 ​profile ​images * 14.45 14.01 ​profile ​images g-band background issue *
19 61220 1.7 ​profile ​images * 14.10 13.56 ​profile ​images saturated center *
20 12514 1.7 16.07 15.69 ​profile ​images * 16.14 15.91 ​profile ​images *
21 21918 1.7 14.51 13.77 ​profile ​images * 14.43 13.78 ​profile ​images *
22 54262 1.78 14.87 14.50 ​profile ​images * 14.93 14.60 ​profile ​images *
23 32786 1.74 13.69 13.13 ​profile ​images * 13.92 13.30 ​profile ​images saturated cneter *
24 50897 1.7 13.87 13.33 ​profile ​images * 14.04 13.45 ​profile ​images saturated center *
25 49995 1.66 13.09 12.25 ​profile ​images * 13.24 12.47 ​profile ​images saturated center *
26 60436 1.62 ​profile ​images * ​profile ​images *
27 70020 1.66 13.72 13.05 ​profile ​images * 13.83 13.18 ​profile ​images background oversubtraction *
28 35621 1.62 14.02 13.51 ​profile ​images * 14.04 13.64 ​profile ​images saturated center *
29 10029 1.62 13.90 13.02 ​profile ​images * 13.97 13.14 ​profile ​images *
30 53332 1.62 14.21 13.56 ​profile ​images * 14.16 13.57 ​profile ​images *
31 40516 1.66 12.29 11.78 ​profile ​images * 12.60 12.12 ​profile ​images saturated center *
32 59634 1.66 14.34 13.61 ​profile ​images * 14.35 13.63 ​profile ​images g-band uncertain *
33 11941 1.51 13.71 12.91 ​profile ​images * 13.69 13.02 ​profile ​images saturated center *
34 50853 1.51 14.64 13.98 ​profile ​images * 14.69 14.00 ​profile ​images *
35 43341 1.51 14.15 13.85 ​profile ​images * 14.56 14.08 ​profile ​images *
36 25781 1.55 14.35 13.88 ​profile ​images * 14.35 13.89 ​profile ​images *
37 27232 1.51 13.29 12.71 ​profile ​images * 13.30 12.77 ​profile ​images *
38 35405 1.58 13.31 12.87 ​profile ​images * 13.39 12.94 ​profile ​images *
39 46321 1.58 13.53 12.94 ​profile ​images * 13.68 13.09 ​profile ​images *
40 23646 1.55 14.34 13.65 ​profile ​images * 14.30 13.68 ​profile ​images saturated center *
41 66622 1.48 14.33 13.57 ​profile ​images * 14.32 13.57 ​profile ​images a few pixel at the center saturated *
42 40761 1.48 14.97 14.76 ​profile ​images low luminosity - high uncertainty * 15.22 15.20 ​profile ​images i-band data uncerain - artifact *
43 10542 1.41 14.69 13.91 ​profile ​images * 14.55 13.85 ​profile ​images *
44 6627 1.41 15.12 14.29 ​profile ​images done * 15.11 14.32 ​profile ​images *
45 26871 1.45 15.92 15.35 ​profile ​images * 16.05 15.41 ​profile ​images *
46 49489 1.48 12.58 11.91 ​profile ​images * 12.57 11.94 ​profile ​images *
47 47680 1.45 14.72 14.17 ​profile ​images * 14.73 14.16 ​profile ​images *
48 22827 1.41 13.61 13.16 ​profile ​images * 13.64 13.17 ​profile ​images *
49 50017 1.32 14.93 14.13 ​profile ​images * 15.06 14.16 ​profile ​images saturated center *
50 59498 1.32 13.94 13.46 ​profile ​images * 13.97 13.49 ​profile ​images *
51 23519 1.35 1.93 1.71 ​profile ​images sounds noisy * 14.16 13.61 ​profile ​images intense g-ban masking *
52 47935 1.35 15.52 14.75 ​profile ​images * 15.54 14.81 ​profile ​images *
53 11074 1.35 14.56 13.94 ​profile ​images * 14.54 13.92 ​profile ​images *
54 51155 1.32 14.11 13.39 ​profile ​images * 14.16 13.42 ​profile ​images *
55 26765 1.35 14.36 13.80 ​profile ​images * 14.45 13.80 ​profile ​images *
56 6982 1.32 13.57 12.84 ​profile ​images done * 13.62 12.91 ​profile ​images *
57 49838 1.29 14.58 13.97 ​profile ​images * 14.64 14.03 ​profile ​images *
58 55349 1.23 14.81 14.03 ​profile ​images * 15.01 14.19 ​profile ​images *
59 22381 1.23 13.57 12.85 ​profile ​images * 13.52 12.82 ​profile ​images *
60 55475 1.23 15.00 14.48 ​profile ​images * 14.99 14.50 ​profile ​images saturated center *
61 39113 1.29 15.30 14.95 ​profile ​images noisy uncertain z-band data * 15.51 15.21 ​profile ​images *
62 34692 1.26 13.33 12.90 ​profile ​images * 13.38 12.99 ​profile ​images *
63 64552 1.26 ​profile ​images * 14.07 13.46 ​profile ​images messy - heavy masking *
64 59735 1.2 14.14 13.75 ​profile ​images * 14.25 13.92 ​profile ​images g-band, llosing light ... background oversubtraction in all bands (probable) *
65 151574 1.1 14.93 14.15 ​profile ​images * 14.89 14.15 ​profile ​images *
66 50210 1.1 14.43 14.24 ​profile ​images * 14.72 14.44 ​profile ​images *
67 47305 1.12 15.20 14.62 ​profile ​images * 15.20 14.64 ​profile ​images *
68 22880 1.12 14.90 14.30 ​profile ​images * 14.90 14.35 ​profile ​images *
69 12775 1.15 16.23 15.48 ​profile ​images * 16.17 15.37 ​profile ​images *
70 62651 1.1 14.78 13.66 ​profile ​images very crowded * 14.68 13.78 ​profile ​images super messy, crowded field, tons of foreground stars *
71 56366 1.1 15.08 14.67 ​profile ​images * 15.07 14.68 ​profile ​images *
72 50262 1.1 13.78 13.52 ​profile ​images * 14.04 13.79 ​profile ​images *
73 32708 1.07 15.04 14.66 ​profile ​images * 15.32 14.70 ​profile ​images *
74 37740 1.0 15.87 15.68 ​profile ​images * 16.04 15.73 ​profile ​images *
75 53864 1.0 15.54 15.26 ​profile ​images no good z and u-bands * 15.47 15.22 ​profile ​images *
76 40408 1.05 14.86 14.45 ​profile ​images * 14.90 14.52 ​profile ​images *
77 507 1.02 14.87 14.12 ​profile ​images Done * 14.89 14.16 ​profile ​images *
78 33869 1.05 14.99 14.28 ​profile ​images * 14.99 14.29 ​profile ​images *
79 60049 1.07 15.71 15.03 ​profile ​images bright star at the center ... probably missing light * 15.61 15.01 ​profile ​images *
80 24469 1.0 14.67 14.12 ​profile ​images bright nearby galaxy, fuccy light around the galaxy. ... probably a disturbed system ... ejected gas !!!!? * 14.65 14.08 ​profile ​images bright close galaxy ... *
81 23465 0.98 15.13 14.80 ​profile ​images * 15.12 14.85 ​profile ​images *
82 71288 0.98 14.39 13.73 ​profile ​images * 14.40 13.86 ​profile ​images *
83 58514 0.91 16.36 15.53 ​profile ​images * 16.16 15.45 ​profile ​images *
84 49137 0.93 14.56 14.08 ​profile ​images * 14.57 14.09 ​profile ​images background oversubraction in g-band *
85 90968 0.91 5.80 5.55 ​profile ​images noisy, seems to be super bright (weird !!!) * 16.43 16.11 ​profile ​images super uncertain, bad background *
86 61254 0.91 15.02 14.25 ​profile ​images u-band not good, other bands uncertain, z-band seems to be Ok though ... the accuracy 0.1 mag * 15.29 14.60 ​profile ​images intense masking *
87 53891 0.95 18.38 17.29 ​profile ​images * 15.02 14.55 ​profile ​images very bright star next to the galaxy - super uncertain *
88 59376 0.91 14.64 13.99 ​profile ​images * 14.61 13.97 ​profile ​images *
89 54400 0.85 15.85 15.22 ​profile ​images * 15.83 15.21 ​profile ​images *
90 25111 0.83 14.68 14.36 ​profile ​images * 14.79 14.45 ​profile ​images *
91 68009 0.89 15.34 14.56 ​profile ​images * 15.24 14.51 ​profile ​images *
92 91489 0.89 16.28 15.54 ​profile ​images * 16.23 15.52 ​profile ​images *
93 6678 0.89 15.41 14.79 ​profile ​images * 15.48 14.78 ​profile ​images *
94 24977 0.85 15.26 14.57 ​profile ​images * 15.27 14.56 ​profile ​images loosing light on the edges !!! *
95 24012 0.85 14.75 14.35 ​profile ​images * 14.76 14.33 ​profile ​images *
96 67626 0.89 14.52 13.91 ​profile ​images * 14.55 13.97 ​profile ​images *
97 23026 0.78 14.24 13.81 ​profile ​images * 14.27 13.80 ​profile ​images *
98 47966 0.74 15.31 14.68 ​profile ​images * 15.21 14.64 ​profile ​images *
99 4010299 0.74 16.45 16.05 ​profile ​images looks like a blob ... probably not good for distance measurments * 16.52 16.23 ​profile ​images *
100 22918 0.78 14.64 13.89 ​profile ​images * 14.62 13.91 ​profile ​images *
101 60271 0.72 16.14 15.84 ​profile ​images * 16.09 15.86 ​profile ​images *
102 58700 0.78 16.89 16.34 ​profile ​images * 16.90 16.34 ​profile ​images *
103 91110 0.71 16.79 16.33 ​profile ​images * 16.85 16.52 ​profile ​images *
104 52350 0.79 15.15 14.55 ​profile ​images * 15.15 14.51 ​profile ​images *
105 91488 0.68 16.88 16.37 ​profile ​images * 16.88 16.36 ​profile ​images *
106 43840 0.68 15.44 14.89 ​profile ​images * 15.48 14.94 ​profile ​images *
107 23033 0.63 16.61 15.92 ​profile ​images * 16.88 16.16 ​profile ​images g-band has problems *
108 55844 0.65 14.88 14.18 ​profile ​images * 14.80 14.13 ​profile ​images *
109 40943 0.6 15.32 14.94 ​profile ​images * 15.40 14.99 ​profile ​images *
110 38457 0.62 15.62 15.23 ​profile ​images * 15.57 15.56 ​profile ​images very bad data *
111 91516 0.66 16.71 16.10 ​profile ​images * 16.58 16.25 ​profile ​images *
112 67891 0.65 15.75 15.13 ​profile ​images * 15.66 15.07 ​profile ​images *
113 51293 0.58 15.54 15.13 ​profile ​images super face-on * 15.41 14.99 ​profile ​images *
114 214939 0.58 16.81 16.14 ​profile ​images * 16.83 16.33 ​profile ​images *
115 22218 0.59 15.69 15.26 ​profile ​images * 15.67 15.30 ​profile ​images *
116 91009 0.5 17.28 16.78 ​profile ​images * 17.24 16.83 ​profile ​images *
117 51230 0.58 15.68 15.23 ​profile ​images * 15.62 15.18 ​profile ​images *
118 30263 0.55 13.94 13.47 ​profile ​images * 13.94 13.48 ​profile ​images *
119 39038 0.56 15.54 15.00 ​profile ​images * 15.50 14.98 ​profile ​images *
120 51144 0.56 15.66 15.31 ​profile ​images * 15.74 15.34 ​profile ​images *
121 165902 0.47 15.82 15.06 ​profile ​images * 15.75 15.04 ​profile ​images *
122 169959 0.49 16.59 16.13 ​profile ​images * 16.75 16.31 ​profile ​images *
123 100776 0.4 15.58 14.91 ​profile ​images * 15.54 14.89 ​profile ​images *
124 33529 0.48 15.85 15.47 ​profile ​images z-band magnitude Not reliable ! * 16.07 15.49 ​profile ​images *
125 22630 0.4 15.96 15.45 ​profile ​images * 15.96 15.50 ​profile ​images *
126 90854 0.49 17.19 16.67 ​profile ​images * 17.17 16.73 ​profile ​images bad g-band data *
127 139387 0.42 16.95 16.50 ​profile ​images * 16.96 16.49 ​profile ​images *
128 3460270 0.48 16.43 15.93 ​profile ​images * 16.51 15.99 ​profile ​images *
129 49294 0.39 15.21 14.76 ​profile ​images bad U-band magnitude * 15.39 14.84 ​profile ​images *
130 38963 0.35 16.19 15.80 ​profile ​images * 16.10 15.88 ​profile ​images *
131 140542 0.35 16.14 15.72 ​profile ​images * 16.06 15.76 ​profile ​images *
132 142843 0.38 16.64 16.22 ​profile ​images There is an edge-on nearby galaxy. There is chance tht the HI measurments are confused. Not recommended for distance measurements * 16.64 16.25 ​profile ​images *
133 1331483 0.37 16.03 15.63 ​profile ​images * 15.94 15.57 ​profile ​images *
134 39342 0.37 15.19 14.90 ​profile ​images * 15.26 14.93 ​profile ​images *
135 23531 0.35 16.53 16.16 ​profile ​images * 16.61 16.16 ​profile ​images *
136 91191 0.35 4.43 4.51 ​profile ​images bad image, good photometry * 16.69 16.51 ​profile ​images *
137 1701087 0.28 16.53 16.43 ​profile ​images No good z-band profile * 16.63 16.45 ​profile ​images *
138 39833 0.2 16.78 16.47 ​profile ​images bad z/u bands * 17.83 17.48 ​profile ​images super uncertain - bright star in the field . bad data *
139 48409 0.28 16.07 15.76 ​profile ​images bright galaxy next to the center,bad z-band, gri magnitudes seems to be ok * 16.21 15.81 ​profile ​images bright objsct near the center ... probability of contamination *
140 41716 0.28 15.37 14.86 ​profile ​images * 15.56 14.94 ​profile ​images *
141 1672298 0.28 18.04 17.14 ​profile ​images super faint, no morphology can be determined * 17.77 17.10 ​profile ​images bad SB profile .... *
142 1305231 0.27 16.53 16.49 ​profile ​images No good magnitude .. next to a bright star ... * 17.20 17.04 ​profile ​images Terrible *
143 35380 0.2 14.06 13.75 ​profile ​images * 14.19 13.84 ​profile ​images *
144 91775 0.26 16.27 15.81 ​profile ​images * 16.25 15.82 ​profile ​images *
Last modified 10 years ago Last modified on Dec 7, 2016, 8:15:23 PM

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