J/MNRAS/416/2415 Morphological parameters of WHISP galaxies (Holwerda+, 2011)
Quantified H I morphology.
II. Lopsidedness and interaction in WHISP column density maps.
Holwerda B.W., Pirzkal N., de Blok W.J.G., Bouchard A., Blyth S.-L.,
Van Der Heyden K.J., Elson E.C.
<Mon. Not. R. Astron. Soc., 416, 2415-2425 (2011)>
=2011MNRAS.416.2415H 2011MNRAS.416.2415H
ADC_Keywords: Galaxies, nearby ; H I data ; Morphology
Keywords: galaxies: fundamental parameters - galaxies: interactions -
galaxies: kinematics and dynamics - galaxies: spiral -
galaxies: structure
Abstract:
Lopsidedness of the gaseous disc of spiral galaxies is a common
phenomenon in disc morphology, profile and kinematics. Simultaneously,
the asymmetry of a galaxy's stellar disc, in combination with other
morphological parameters, has seen extensive use as an indication of
recent merger or interaction in galaxy samples. Quantified morphology
of stellar spiral discs is one avenue to determine the merger rate
over much of the age of the Universe. In this paper, we measure the
quantitative morphology parameters for the HI column density maps
from the Westerbork observations of neutral Hydrogen in Irregular and
SPiral galaxies (WHISP). These are Concentration, Asymmetry,
Smoothness, Gini, M20 and one addition of our own, the Gini parameter
of the second-order moment (GM). Our aim is to determine if lopsided
or interacting discs can be identified with these parameters. Our
sample of 141 HI maps have all previous classifications on their
lopsidedness and interaction.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 681 73 The morphological parameters of the WHISP galaxies
in Swaters et al. (2002A&A...390..829S 2002A&A...390..829S)
tablea2.dat 682 68 The morphological parameters of the WHISP galaxies
in Noordermeer et al. (2005, Cat. J/A+A/442/137)
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See also:
J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)
J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005)
J/MNRAS/416/2401 : Quantified H I morphology. I (Holwerda+, 2011)
J/MNRAS/416/2437 : Quantified H I morphology. IV (Holwerda+, 2011)
J/MNRAS/427/3159 : Quantified H I morphology. VI (Holwerda+, 2012)
Byte-by-byte Description of file:tablea?.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- UGC UGC number
7- 20 F14.12 --- Gini ? Gini parameter (1)
22- 38 F17.15 --- e_Gini ? Error on Gini
40- 55 F16.14 --- E_Gini ? Second error on Gini
57- 71 F15.12 --- M20 ? Moment of light parameter
73- 88 F16.14 --- e_M20 ? Error on M20
90-107 E18.16 --- E_M20 ? Second error on M20
108-122 F15.12 --- c2080 ? Concertration parameter,
C20/80=5log(r80/r20)
124-139 F16.14 --- e_c2080 ? Error on c2080
141-157 F17.15 --- E_c2080 ? Second error on c2080
158-173 F16.13 --- c5080 ? Concertration parameter,
C50/80=5log(r80/r50)
175-190 F16.14 --- e_c5080 ? Error on c5080
192-208 F17.15 --- E_c5080 ? Second error on c5080
209-224 F16.13 --- c2090 ? Concertration parameter,
C20/90=5log(r90/r20)
225-240 F16.14 --- e_c2090 ? Error on c2090
242-258 F17.15 --- E_c2090 ? Second error on c2090
259-274 F16.13 --- c5090 ? Concertration parameter,
C50/90=5log(r90/r50)
276-292 F17.15 --- e_c5090 ? Error on c5090
294-310 F17.15 --- E_c5090 ? Second error on c5090
312-325 F14.12 --- A ? Asymetry parameter
327-342 F16.14 --- e_A ? Error on A
344-359 E16.14 --- E_A ? Second error on A
361-376 F16.14 --- S ? Smoothness parameter
378-394 F17.15 --- e_S ? Error on S
396-412 E17.15 --- E_S ? Second error on S
414-430 F17.15 --- Ell ? Ellipticity
432-448 F17.15 --- e_Ell ? Error on Ell
450-466 E17.12 --- E_Ell ? Second error on Ell
468-484 F17.15 --- GM ? Gini of the second-order moment parameter
486-502 F17.15 --- e_GM ? Error on GM
504-520 E17.15 --- E_GM ? Second error on GM
522-538 F17.15 --- Lop ? Lopsidedness
540-556 E17.12 --- e_Lop ? Error on Lop
558-574 E17.15 --- E_Lop ? Second error on Lop
576-592 F17.15 --- LopX ? Lopsidedness along X
594-610 F17.15 --- e_LopX ? Error on LopX
612-628 F17.15 --- E_LopX ? Second error on LopX
630-645 F16.14 --- LopY ? Lopsidedness along Y
648-664 E17.15 --- e_LopY ? Error on LopY
666-682 E17.15 --- E_LopY ? Second error on LopY
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Note (1): Gini parameter quantifies the distribution of flux over the
pixels in an image. The Gini parameter is an indication of equality in
a distribution, with G=0 the perfect equality (all pixels have the
same intensity) and G=1 perfect inequality (all the intensity is in a
single pixel).
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History:
From electronic version of the journal
References:
Holwerda et al., Paper I 2011MNRAS.416.2401H 2011MNRAS.416.2401H, Cat. J/MNRAS/416/2401
Holwerda et al., Paper III 2011MNRAS.416.2426H 2011MNRAS.416.2426H
Holwerda et al., Paper IV 2011MNRAS.416.2437H 2011MNRAS.416.2437H, Cat. J/MNRAS/416/2437
Holwerda et al., Paper V 2011MNRAS.416.2447H 2011MNRAS.416.2447H
Holwerda et al., Paper VI 2012MNRAS.427.3159H 2012MNRAS.427.3159H, Cat. J/MNRAS/427/3159
(End) Patricia Vannier [CDS] 13-Apr-2012