J/MNRAS/416/2401 HI morphology of 28 THINGS galaxies (Holwerda+, 2011)
Quantified H I morphology.
I. Multi-wavelength analysis of the THINGS galaxies.
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, 2401-2414 (2011)>
=2011MNRAS.416.2401H 2011MNRAS.416.2401H
ADC_Keywords: Galaxies, nearby ; H I data ; Morphology
Keywords: galaxies: fundamental parameters - galaxies: interactions -
galaxies: kinematics and dynamics - galaxies: spiral -
galaxies: structure
Abstract:
Galaxy evolution is driven to a large extent by interactions and
mergers with other galaxies and the gas in galaxies is extremely
sensitive to the interactions. One method to measure such interactions
uses the quantified morphology of galaxy images. Well-established
parameters are Concentration, Asymmetry, Smoothness, Gini and M20 of a
galaxy image. Thus far, the application of this technique has mostly
been restricted to rest-frame ultraviolet and optical images. However,
with the new radio observatories being commissioned [South African
Karoo Array Telescope (MeerKAT), Australian SKA Pathfinder (ASKAP),
Extended Very Large Array (EVLA), Westerbork Synthesis Radio
Telescope/APERture Tile In Focus instrument (WSRT/APERTIF) and
ultimately the Square Kilometer Array (SKA)], a new window on the
neutral atomic hydrogen gas (HI) morphology of large numbers of
galaxies will open up. The quantified morphology of gas discs of
spirals can be an alternative indicator of the level and frequency of
interaction. The HI in galaxies is typically spatially more extended
and more sensitive to low-mass or weak interactions.
Description:
In this paper, we explore six morphological parameters calculated over
the extent of the stellar (optical) disc and the extent of the gas
disc for a range of wavelengths spanning ultraviolet (UV), optical,
near- and far-infrared and 21cm (HI) of 28 galaxies from The HI
Nearby Galaxy Survey (THINGS).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 97 28 THINGS galaxies basic data
tablea1.dat 43 21 Filter names, their wavelength and typical
resolution of the THINGS, SINGS and ancillary data
tablea.dat 115 999 Morphological parameters for the stellar (s) and
neutral hydrogen gas (g) disks
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See also:
J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)
J/MNRAS/416/2415 : Quantified H I morphology. II (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: tablea2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Galaxy name
14- 28 A15 --- OName Other name
30- 31 I2 h RAh Right ascension (J2000)
33- 34 I2 min RAm Right ascension (J2000)
36- 39 F4.1 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 49 I2 arcsec DEs Declination (J2000)
51- 53 A3 --- r_Pos Reference for position (1)
55- 58 F4.1 Mpc Dist Distance
60- 64 A5 --- r_Dist Reference for Dist (1)
66- 67 I2 deg Incl Inclination
69- 71 I3 deg PA Position angle
73- 76 A4 --- r_PA Reference for PA (1)
78- 79 I2 --- Type Morphological type
81 A1 --- SINGS [y/n] SINGS data ?
83 A1 --- SDSS [y/n] SDSS data ?
85 A1 --- GALEX [y/n] GALEX data ?
87- 97 A11 --- Filt SINGS ancillary, in tablea1.dat
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Note (1): References as follows:
B06 = Begum et al., 2006MNRAS.365.1220B 2006MNRAS.365.1220B
B81 = Bosma et al., 1981A&A....93..106B 1981A&A....93..106B
D00 = Drozdovsky & Karachentsev, 2000, Cat. J/A+AS/142/425
F01 = Freedman et al., 2001ApJ...553...47F 2001ApJ...553...47F
K02 = Karachentsev et al., 2002A&A...383..125K 2002A&A...383..125K
K04 = Karachentsev et al., 2004, Cat. J/AJ/127/2031
L02 = Leonard et al., 2002AJ....124.2490L 2002AJ....124.2490L
M01 = Murphy et al., 2001ApJ...559..201M 2001ApJ...559..201M
O01 = Ott et al., 2001AJ....122.3070O 2001AJ....122.3070O
O08 = Oh et al., 2008AJ....136.2761O 2008AJ....136.2761O
P92 = Puche et al., 1992AJ....103.1841P 1992AJ....103.1841P
T08 = Trachternach et al., 2008AJ....136.2720T 2008AJ....136.2720T
dB08 = de Blok et al., 2008AJ....136.2648D 2008AJ....136.2648D
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Type Filter name
28- 35 A8 --- lambda Wavelength
36- 43 A8 --- Res Resolution
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Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Galaxy name
13 A1 --- Data [sg] s: stellar or g: neutral hydrogen gas data
15- 21 A7 --- Filter Filter name
24- 29 F6.3 --- Gini ?=- Gini parameter (1)
31- 35 F5.3 --- e_Gini ?=- rms uncertainty on Gini
37- 42 F6.3 --- M20 ?=- Moment of light parameter
44- 48 F5.3 --- e_M20 ?=- rms uncertainty on M20
50- 55 F6.3 --- C ?=- Concentration parameter, C=5log(r80/r20)
57- 61 F5.3 --- e_C ?=- rms uncertainty on C
63- 69 F7.3 --- A ?=- Asymmetry parameter
71- 75 F5.3 --- e_A ?=- rms uncertainty on A
77- 81 F5.3 --- S ?=- Smoothness parameter
83- 87 F5.3 --- e_S ?=- rms uncertainty on S
89- 93 F5.3 --- Ell ?=- Ellipticity
95- 99 F5.3 --- e_Ell ?=- rms uncertainty on Ell
101-108 F8.3 --- GM ?=- Gini of the second-order moment parameter
110-115 F6.3 --- e_GM ?=- rms uncertainty on GM
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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 II 2011MNRAS.416.2415H 2011MNRAS.416.2415H, Cat. J/MNRAS/416/2415
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] 12-Apr-2012