Open Access
Table A.2.
Questionnaire given to expert classifiers for identifying ram pressure stripping features.
| Question/task | Response |
|---|---|
| Do you see any unusual features in this galaxy? | – Merger/Tidal interaction - It looks like the galaxy is merging or has been affected by gravitational interactions |
| – Ram Pressure - The galaxy has tails or other features (such as unwinding spiral arms) indicative of ram pressure stripping | |
| – Unsure - It appears that something is disturbing the galaxy, but I can’t tell if it is ram pressure stripping or something else | |
| – Ram Pressure + Tidal - Both ram pressure stripping + tidal interaction could be at play | |
| – Something Else/Nothing - This galaxy doesn’t appear to have any unusual features, or there are features | |
| which are not described above | |
| †What ram pressure stripping features do you see? (select all that apply) | – Tails (faint diffuse extra-planar material and/or extra-planar knots of star formation) |
| – Star formation on one side of the disk indicative of gas compression in the leading edge / shock front (may be C-shaped) | |
| – Spiral-arm asymmetries or deformations | |
| – Something else (please note this in the comment section) | |
| †On a scale of 1 to 5, how strong would you describe the strength of the ram pressure stripping? | – 5 - This galaxy contains very clear and obvious ram pressure signatures (spectacular cases of jellyfish) |
| – 4 - This galaxy contains clear ram pressure features | |
| – 3 - This galaxy contains probable ram pressure features that are visible in the image | |
| – 2 - This galaxy might contain some features consistent with ram pressure stripping, but it is hard to be certain | |
| – 1 - There is something unusual about this galaxy, which may be consistent with ram pressure stripping, but it is not very clear | |
| – 0 - On closer inspection, maybe I don’t see ram pressure features any more | |
| †Can you estimate the tail direction, or the direction of the ram pressure wind? | – Yes, I can give an estimate of the tail direction |
| – No, I can’t tell which direction the ram pressure is acting | |
| †‡Draw in the direction of the tail/ram pressure stripping (i.e. opposite to the projected direction of motion of the galaxy). Start your line in the centre of the image. | – (Classifier draws in the tail direction or direction of the ram pressure wind) |
| If there is anything interesting about this galaxy you wish to note, write it below | – User open for comments |
Notes. ( † ) requires the classifier to answer question 1 with Ram Pressure, Unsure, or Ram Pressure + Tidal to receive this question. ( ‡ ) requires the classifier to answer question 4 with Yes to receive this question.
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