J/AJ/133/2846 Photometric decomposition of barred galaxies (Reese+, 2007)
Photometric decomposition of barred galaxies.
Reese A.S., Williams T.B., Sellwood J.A., Barnes E.I., Powell B.A.
<Astron. J., 133, 2846-2858 (2007)>
=2007AJ....133.2846R 2007AJ....133.2846R
ADC_Keywords: Galaxies, photometry ; Morphology
Keywords: galaxies: fundamental parameters - galaxies: kinematics and dynamics -
galaxies: photometry - galaxies: spiral - galaxies: structure -
methods: data analysis
Abstract:
We present a nonparametric method for decomposition of the light of
disk galaxies into disk, bulge, and bar components. We have developed
and tested the method on a sample of 68 disk galaxies for which we
have acquired I-band photometry. The separation of disk and bar light
relies on the single assumption that the bar is a straight feature
with a different ellipticity and position angle from that of the
projected disk. Here we present the basic method, but we recognize
that it can be significantly refined.
Description:
The galaxies were observed on the nights of 2000 April 6-10 using the
CTIO 0.9m telescope and the Tek2K No. 3 CCD.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 95 Galaxy Photometry
table2.dat 151 68 Galaxy Decompositions
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- [RWS2007] Galaxy identification (gNNN)
6 A1 --- f_[RWS2007] [*] indicates galaxy heavily contaminated
by nearby star
8- 17 A10 --- GSC GSC identification (Cat. I/254)
19- 41 A23 --- OName Other name
43- 47 F5.2 mag Bmag ? B band R25 magnitude (2)
49- 53 F5.2 mag Vmag ? V band R25 magnitude (2)
55- 59 F5.2 mag Imag ? I band R25 magnitude (2)
61- 64 F4.2 mag B-I ? (B-I) color index at the I25 isophote
66- 69 F4.2 mag V-I ? (V-I) color index at the I25 isophote
71- 77 A7 --- RC3 RC3 morphological type (Cat. VII/155)
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Note (2): The B, V and I band magnitude uncertainty is ±0.048, 0.035,
and 0.046mag, respectively.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- [RWS2007] Galaxy name (gNNN)
6- 10 F5.1 % disk Fraction of the light contributed by the disk
12- 14 F3.1 % E_disk ? Upper limit uncertainty in disk
16- 18 F3.1 % e_disk ? Lower limit uncertainty in disk
20- 23 F4.1 % bar ? Fraction of the light contributed by the bar
25- 27 F3.1 % E_bar ? Upper limit uncertainty in bar
29- 31 F3.1 % e_bar ? Lower limit uncertainty in bar
33- 36 F4.1 % bulge ? Fraction of the light contributed by the bulge
38- 40 F3.1 % E_bulge ? Upper limit uncertainty in bulge
42- 44 F3.1 % e_bulge ? Lower limit uncertainty in bulge
46- 50 F5.3 --- Edisk Disk ellipticity
52- 56 F5.3 --- E_Edisk Upper limit uncertainty in Edisk
58- 62 F5.3 --- e_Edisk Lower limit uncertainty in Edisk
64- 68 F5.1 deg PAdisk Position angle of disk's major axis
70- 73 F4.1 deg E_PAdisk Upper limit uncertainty in PAdisk
75- 77 F3.1 deg e_PAdisk Lower limit uncertainty in PAdisk
79- 82 F4.2 --- Ebar ? Bar ellipticity
84- 87 F4.2 --- E_Ebar ? Upper limit uncertainty in Ebar
89- 92 F4.2 --- e_Ebar ? Lower limit uncertainty in Ebar
94- 98 F5.1 deg PAbar ? Position angle of bar's major axis
100-102 F3.1 deg E_PAbar ? Upper limit uncertainty in PAbar
104-106 F3.1 deg e_PAbar ? Lower limit uncertainty in PAbar
108-111 F4.2 --- Ebulge ? Bulge ellipticity
113-116 F4.2 --- E_Ebulge ? Upper limit uncertainty in Ebulge
118-121 F4.2 --- e_Ebulge ? Lower limit uncertainty in Ebulge
123-126 F4.2 --- n ? Bulge Sersic index
128-131 F4.2 --- E_n ? Upper limit uncertainty in n
133-136 F4.2 --- e_n ? Lower limit uncertainty in n
138-141 F4.1 arcsec Reff ? Bulge effective radius
143-146 F4.1 arcsec E_Reff ? Upper limit uncertainty in Reff
148-151 F4.1 arcsec e_Reff ? Lower limit uncertainty in Reff
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 31-May-2009