J/ApJ/907/123 Spin Parity of Spiral Galaxies. III. (Iye+, 2021)
Spin parity of spiral galaxies. III. Dipole analysis of the distribution of
SDSS spirals with 3D random walk simulations.
Iye M., Yagi M., Fukumoto H.
<Astrophys. J. 907, 123 (2021)>
=2021ApJ...907..123I 2021ApJ...907..123I (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Morphology ; Redshifts
Keywords: anisotropy - catalogs - galaxies: formation - galaxies: rotation -
galaxies: spiral - cosmology: large-scale structure of Universe
Abstract:
This is a revised catalog of spiral winding direction of SDSS spiral
galaxies published by Shamir (2017PASA...34...11S 2017PASA...34...11S). Whether the spiral
pattern as projected on the sky is S-wise or Z-wise (Shamir called
them counter clock wise and clockwise, respectively) can be an
unambiguous tool to identify whether the galaxy spin vector is
pointing toward or away from us as all the spirals are safely regarded
as trailing spirals (Iye et al., 2019ApJ...886..113S 2019ApJ...886..113S). We used
Shamir's catalog to analyze the dipole anisotropy in their large-scale
structure and found that there exist rather massive duplicated entries
and a few other minor errors in the original catalog. In this revised
version those duplicated entries are cleaned keeping the judgment of
the spiral winding direction due to Shamir (2017PASA...34...11S 2017PASA...34...11S)
except for a several obviously inconsistent cases. These corrections
were necessary to make analysis of the large scale distribution of
spin vectors of galaxies of the SDSS sample in our paper.
Description:
The original catalog by Shamir (2017PASA...34...11S 2017PASA...34...11S) contained 162516
spirals entries from SDSS DR8 catalog using a PhotObjAll query. They
are classified into two datasets, cw.csv (S-spirals, 82244 entries)
and ccw.csv (Z-spirals, 80272 entries), based on their automatic
Ganalyzer algorithm (Shamir 2011ApJ...736..141S 2011ApJ...736..141S). The PhotObjAll
table, however, contains duplicated entries for the same galaxy. We
grouped the objects within 3 arcsec to remove duplications. In this
revi catalog, duplicated entries for 34,198 spirals with different
ObjIDs were visually confirmed to be the identical galaxies and were
removed. A total of 106 spirals, having entries both in the cw and ccw
sets were visually checked to assign either in S or Z categories. Two
galaxies had duplicated entries with the same ObjID. After these
cleaning processes we are left with 72888 spirals. RA, DEC, and
redshift (photometric redshift with 0.01 resolution or spectroscopic
redshift with 0.000001 resolution) are taken from SDSS DR8.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
sdss_sz.dat 65 162516 Revised S/Z catalog with annotations
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See also:
J/ApJS/223/20 : SDSS-DR8 galaxies classified by WND-CHARM (Kuminski+, 2016)
http://sdss3.org/dr8/ : The Eighth SDSS Data Release (DR8)
https://data-portal.hpc.swin.edu.au/dataset/
data-for-galaxy-assymetry-experiment : Data for galaxy asymmetry experiment
Shamir (2017PASA...34...11S 2017PASA...34...11S)
Byte-by-byte Description of file: sdss_sz.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- SDSS SDSS DR8 Object ID
21- 22 I2 --- helicity [-1/+1] Spiral Winding Direction S(-1) or Z(+1)
24- 33 F10.6 deg RAdeg [0/360] Right Ascension (J2000.0)
35- 44 F10.6 deg DEdeg [-25/+85] Declination (J2000.0)
46- 53 F8.6 --- z [0.003/4.492] Redshift (1)
55 I1 --- dupflag [0/3] Type of Duplication (2)
57 I1 --- action [0/1] Editing Action (3)
59- 63 I5 --- group-no [0/34213] Duplicated Group Number (4)
65 I1 --- dataset [0/2] Dataset used, this paper (5)
--------------------------------------------------------------------------------
Note (1): Photometric redshift estimated by Paul et al. (2018Galax...6...64P 2018Galax...6...64P).
Note (2): Flag on dupflag as follows:
0 = No Duplication
1 = duplicated with different ObjID
2 = Duplicated with identical ID
3 = Contradicting S/Z classification
Note (3): action flag as follows:
0 = Removed
1 = Retained
Note (4): For group-no, 0 = No duplication
Note (5): dataset flag as follow:
0 = Not used
1 = 0.01=<z=<0.1
2 = z<0.01 or z>0.1
---------------------------------------------------------------------
Acknowledgements:
Lior Shamir, lshamir(at)ksu.edu
References:
Shamir, L., 2011ApJ...736..141S 2011ApJ...736..141S
Ganalyzer: A Tool for Automatic Galaxy Image Analysis
Shamir, L., 2017PASA...34...11S 2017PASA...34...11S
Photometric Asymmetry Between Clockwise and Counterclockwise
Spiral Galaxies in SDSS
Paul, N., Virag, N., Shamir, L., 2018Galax...6...64P 2018Galax...6...64P
doi:10.3990/galaxies6020064
A Catalog of Photometric Redshift and the Distribution of Broad
Galaxy Morphologies
www.mdpi.com/journal/galaxies
https://figshare.com/articles/
Morphologyandphotometricredshiftcatalog/4833593
Iye, M., Tadaki, K., Fukumoto, H., 2019ApJ...886..113S 2019ApJ...886..113S
Spin Parity of Spiral Galaxies. I. Corroborative Evidence for
Trailing Spirals, Paper I
Tadaki, K.,Iye, M., Fukumoto, H., et al., 2020MNRAS.496.4276T 2020MNRAS.496.4276T
Spin parity of spiral galaxies. II. A catalogue of 80 k spiral galaxies
using big data from the Subaru Hyper Suprime-Cam survey and deep learning,
Paper II
(End) Iye M., Yagi M., Fukumoto H. [NAOJ, Japan], P. Vannier [CDS] 06-Oct-2020