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Data for galaxy assymetry experiment

This page provides links to data files used in the experiment described in Photometric asymmetry between clockwise and counterclockwise spiral galaxies in SDSS 

The files can be uploaded to SDSS Catalog Archive Server (CAS) and then used to replicate the results of the experiment. For instance, comparing the r magnitude of the of the classes can be done with the following CAS query:

select avg(g) from PhotoObjAll, MyDB.cw where Objid=ID and g>0 and ra>90 and ra<270 
select stdev(g) from PhotoObjAll, MyDB.cw where Objid=ID and g>0 and ra>90 and ra<270 
select count(g) from PhotoObjAll, MyDB.cw where Objid=ID and g>0 and ra>90 and ra<270 
select avg(g) from PhotoObjAll, MyDB.ccw where Objid=ID and g>0 and ra>90 and ra<270 
select stdev(g) from PhotoObjAll, MyDB.ccw where Objid=ID and g>0 and ra>90 and ra<270 
select count(g) from PhotoObjAll, MyDB.ccw where Objid=ID and g>0 and ra>90 and ra<270 

Then the t-test can be calculated using the mean, standard deviation, and number of samples of the two classes. The "g>0" is added to avoid possible flag values such as "-9999". 

Paper reference:
Shamir, L., Photometric asymmetry between clockwise and counterclockwise spiral galaxies in SDSS, PASA, In Press, 2017.

Data and Resources

Cite this as

Lior Shamir (2017). Dataset: Data for galaxy assymetry experiment. http://dx.doi.org/10.4225/50/58855aab08e7c

Retrieved: 22:55, 11 Jan 2026 (GMT)

Data Portal Metadata

Field Value
Author Lior Shamir
Version 1.0
Last Updated January 25, 2017, 11:32 (Australia/Sydney)
Publish Date January 23, 2017, 12:13 (Australia/Sydney)
Data DOI http://dx.doi.org/10.4225/50/58855aab08e7c
Paper DOI http://dx.doi.org/10.1017/pasa.2017.4