J/A+A/415/63 UBVRI surface brightness of 26 bright galaxies (Mollenhoff, 2004)
Disk-bulge decompositions of spiral galaxies in UBVRI.
Mollenhoff C.
<Astron. Astrophys. 415, 63 (2004)>
=2004A&A...415...63M 2004A&A...415...63M
ADC_Keywords: Galaxies, photometry ; Photometry, CCD ; Photometry, UBVRI ;
Morphology
Keywords: galaxies: spiral - galaxies: structure - galaxies: photometry -
galaxies: fundamental parameters - galaxies: statistics -
galaxies: formation
Abstract:
The UBVRI images of 26 bright spiral galaxies were decomposed in disks
and bulges. Correlations of the resulting structural parameters are
investigated, giving clues to the formation history of the bulges. We
confirm that the large and bright bulges of early-type spirals are
similar to elliptical galaxies. They were probably formed prior to the
disks in a monolithic collapse or via early mergers. Late-type spirals
have tiny and faint bulges with disk-like profiles. These bulges were
probably formed after the disk in secular evolution processes, e.g.
from a disk instability. The comparison of the color indices of
corresponding spirals and bulges with population synthesis
computations support above formation scenarios.
Description:
26 bright spiral galaxies (Btot<12.7) with low to medium inclination
and without bar were exposed in UBVRI filters. The CAFOS focal reducer
camera at the Calar Alto 2.2m telescope was used. The
surface-brightness distributions were fitted using a 2-dimensional
algorithm with corresponding functions for the disk- and
bulge-structure. For the disks an exponential function was used, for
the bulges a Sersic Rβ law, with the concentration parameter
β=1/n as another fit variable.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 147 26 Structural parameters of the disks
table3.dat 143 26 Structural parameters of the bulges
table4.dat 142 26 Absolute luminosities
tables.tex 181 192 LaTeX version of the tables
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See also:
J/A+A/368/16 : Spiral galaxies JHK surface photometry (Moellenhoff+, 2001)
J/A+AS/118/111 : BVRI photometry of 234 spiral galaxies (Heraudeau+ 1996)
J/AJ/116/1626 : Spiral & lenticular galaxy brightness profiles (Baggett+ 1998)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number
4- 7 I4 --- NGC NGC number
9- 13 F5.2 mag/arcsec+2 SBcU ? U band central surface brightness (1)
15- 19 F5.2 mag/arcsec+2 SBcB B band central surface brightness (1)
21- 25 F5.2 mag/arcsec+2 SBcV V band central surface brightness (1)
27- 31 F5.2 mag/arcsec+2 SBcR ? R band central surface brightness (1)
33- 37 F5.2 mag/arcsec+2 SBcI I band central surface brightness (1)
39- 43 F5.1 arcsec RdU ? U band radial scale-length of the
exponential disk in arcsec
45- 49 F5.1 arcsec RdB B band radial scale-length of the
exponential disk in arcsec
51- 55 F5.1 arcsec RdV V band radial scale-length of the
exponential disk in arcsec
57- 61 F5.1 arcsec RdR ? R band radial scale-length of the
exponential disk in arcsec
63- 67 F5.1 arcsec RdI I band radial scale-length of the
exponential disk in arcsec
69- 72 F4.2 kpc RdUkpc ? U band radial scale-length of the
exponential disk in kpc
74- 77 F4.2 kpc RdBkpc B band radial scale-length of the
exponential disk in kpc
79- 82 F4.2 kpc RdVkpc V band radial scale-length of the
exponential disk in kpc
84- 87 F4.2 kpc RdRkpc ? R band radial scale-length of the
exponential disk in kpc
89- 92 F4.2 kpc RdIkpc I band radial scale-length of the
exponential disk in kpc
94- 98 F5.1 deg PAU ? U band position angle of disk major axis
100-104 F5.1 deg PAB B band position angle of disk major axis
106-110 F5.1 deg PAV V band position angle of disk major axis
112-116 F5.1 deg PAR ? R band position angle of disk major axis
118-122 F5.1 deg PAI I band position angle of disk major axis
124-127 F4.2 --- QU ? U band axis ratio (b/a) (2)
129-132 F4.2 --- QB B band axis ratio (b/a) (2)
134-137 F4.2 --- QV V band axis ratio (b/a) (2)
139-142 F4.2 --- QR ? R band axis ratio (b/a) (2)
144-147 F4.2 --- QI I band axis ratio (b/a) (2)
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Note (1): Seeing-deconvolved and inclination-corrected central surface
brightness in mag/arcsec2
Note (2): Axis ratio of the model fit to the disk
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number
4- 7 I4 --- NGC NGC number
9- 13 F5.2 mag/arcsec+2 SBeU ? U band effective surface brightness
15- 19 F5.2 mag/arcsec+2 SBeB B band effective surface brightness
21- 25 F5.2 mag/arcsec+2 SBeV V band effective surface brightness
27- 31 F5.2 mag/arcsec+2 SBeR ? R band effective surface brightness
33- 37 F5.2 mag/arcsec+2 SBeI I band effective surface brightness
39- 43 F5.2 kpc ReUkpc ? U band effective or half-light radius
45- 48 F4.2 kpc ReBkpc B band effective or half-light radius
50- 53 F4.2 kpc ReVkpc V band effective or half-light radius
55- 58 F4.2 kpc ReRkpc ? R band effective or half-light radius
60- 63 F4.2 kpc ReIkpc I band effective or half-light radius
65- 68 F4.2 --- betaU ? U band slope parameter (1/n) of the bulge
70- 73 F4.2 --- betaB B band slope parameter (1/n) of the bulge
75- 78 F4.2 --- betaV V band slope parameter (1/n) of the bulge
80- 83 F4.2 --- betaR ? R band slope parameter (1/n) of the bulge
85- 88 F4.2 --- betaI I band slope parameter (1/n) of the bulge
90- 94 F5.1 deg PAU ? U band position angle of bulge major axis
96-100 F5.1 deg PAB B band position angle of bulge major axis
102-106 F5.1 deg PAV V band position angle of bulge major axis
108-112 F5.1 deg PAR ? R band position angle of bulge major axis
114-118 F5.1 deg PAI I band position angle of bulge major axis
120-123 F4.2 --- QU ? U band axis ratio (b/a) (1)
125-128 F4.2 --- QB B band axis ratio (b/a) (1)
130-133 F4.2 --- QV V band axis ratio (b/a) (1)
135-138 F4.2 --- QR ? R band axis ratio (b/a) (1)
140-143 F4.2 --- QI I band axis ratio (b/a) (1)
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Note (1): Axis ratio of the elliptical model fit to the bulge.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number
4- 7 I4 --- NGC NGC number
9- 14 F6.2 mag ULum ? U band absolute luminosity of the total galaxy
16- 21 F6.2 mag BLum B band absolute luminosity of the total galaxy
23- 28 F6.2 mag VLum V band absolute luminosity of the total galaxy
30- 35 F6.2 mag RLum ? R band absolute luminosity of the total galaxy
37- 42 F6.2 mag ILum I band absolute luminosity of the total galaxy
44- 49 F6.2 mag dULum ? U band absolute luminosity of the disk
51- 56 F6.2 mag dBLum B band absolute luminosity of the disk
58- 63 F6.2 mag dVLum V band absolute luminosity of the disk
65- 70 F6.2 mag dRLum ? R band absolute luminosity of the disk
72- 77 F6.2 mag dILum I band absolute luminosity of the disk
79- 84 F6.2 mag bULum ? U band absolute luminosity of the bulge
86- 91 F6.2 mag bBLum B band absolute luminosity of the bulge
93- 98 F6.2 mag bVLum V band absolute luminosity of the bulge
100-105 F6.2 mag bRLum ? R band absolute luminosity of the bulge
107-112 F6.2 mag bILum I band absolute luminosity of the bulge
114-118 F5.3 --- b/dU ? U band bulge/disk-ratio
120-124 F5.3 --- b/dB B band bulge/disk-ratio
126-130 F5.3 --- b/dV V band bulge/disk-ratio
132-136 F5.3 --- b/dR ? R band bulge/disk-ratio
138-142 F5.3 --- b/dI I band bulge/disk-ratio
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Acknowledgements: Claus Moellenhoff
(End) Patricia Bauer [CDS] 13-Nov-2003