J/A+A/390/863 CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002)
The Westerbork HI survey of spiral and irregular galaxies.
II. R-band surface photometry of late-type dwarf galaxies.
Swaters R.A., Balcells M.
<Astron. Astrophys. 390, 863 (2002)>
=2002A&A...390..863S 2002A&A...390..863S
ADC_Keywords: Galaxies, photometry ; Photometry, CCD
Keywords: surveys - galaxies: dwarf - galaxies: photometry
Abstract:
R-band surface photometry is presented for 171 late-type dwarf and
irregular galaxies. For a subsample of 46 galaxies B-band photometry
is presented as well. We present surface brightness profiles as well
as isophotal and photometric parameters including magnitudes,
diameters and central surface brightnesses. Absolute photometry is
accurate to 0.1 mag or better for 77% of the sample. For over 85% of
the galaxies the radial surface brightness profiles are consistent
with published data within the measured photometric uncertainty. For
most of the galaxies in the sample HI data have been obtained with the
Westerbork Synthesis Radio Telescope. The galaxies in our sample are
part of the WHISP project (Westerbork HI Survey of Spiral and
Irregular Galaxies), which aims at mapping about 500 nearby spiral and
irregular galaxies in HI. The availability of HI data makes this data
set useful for a wide range of studies of the structure, dark matter
content and kinematics of late-type dwarf galaxies.
Description:
R-band photometric and isophotal parameters for 171 late-type dwarf
galaxies. For each galaxy the date of observation, seeing, adopted
distance, equatorial coordinates, apparent magnitudes, central surface
brightnesses, isophotal diameters and fractional light radii are
given. For 46 galaxies, photometric and isophotal parameters derived
from B-band observations are given as well.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 87 171 Global galaxy properties
tablea2.dat 54 260 Literature and adopted distances
refs.dat 93 23 References for table2a.dat
tablea3.dat 30 171 Date of R-band observations and seeing
tablea4.dat 30 46 Date of B-band observations and seeing
tablea5.dat 93 173 R-band photometric and isophotal parameters
tablea6.dat 93 46 B-band photometric and isophotal parameters
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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- 5 I5 --- UGC UGC number
7- 24 A18 --- OName Other common names
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 35 F4.1 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 45 I2 arcsec DEs Declination (J2000)
47- 53 A7 --- HType Hubble type
55- 60 F6.2 mag BMAG ? B-band absolute magnitude
62- 66 F5.2 Mpc Dist Distance
68- 71 I4 km/s Vsys Heliocentric systemic velocity
73- 75 I3 km/s W50 HI single dish line width at 50% level
77- 82 F6.2 10+8solMass HImass HI mass in units of 108M☉
84- 87 F4.2 mag AR ? R-band Galactic extinction
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- UGC UGC number
7- 11 F5.2 Mpc DistHI Distance from systemic velocity
13- 17 F5.2 Mpc Distref ? Distance quoted in referenced paper
19- 25 A7 --- r_Distref Reference paper, in refs.dat file
27- 49 A23 --- Method Method used to determine distance
51- 54 F4.1 Mpc Dist ? Adopted distance
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Ref Reference code
9- 27 A19 ---- BibCode BibCode
29- 65 A37 --- Aut Author's name
68- 97 A30 ---- Com Comments
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Byte-by-byte Description of file: tablea3.dat tablea4.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- UGC UGC number
7- 16 A10 "YYYY/MM/DD" ObsDate Date of observations
18- 21 I4 s ExpTime Exposure time
23- 25 F3.1 arcsec Seeing Seeing
27- 30 F4.2 mag photrms Estimated photometric uncertainty
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Byte-by-byte Description of file: tablea5.dat tablea6.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- UGC UGC number and comments
6- 7 A2 --- m_UGC [ab ] Multiplicity index on UGC
9- 13 F5.3 --- ell Ellipticity
15- 17 I3 deg PA Position angle
19- 23 F5.2 mag mag25 Magnitude within 25mag/arcsec isophote
25- 29 F5.2 mag maglim Magnitude within limiting isophote
31- 35 F5.2 mag magext Extrapolated magnitude
37- 41 F5.2 mag/arcsec2 SuBrlim Limiting surface brightness
43- 47 F5.2 mag/arcsec2 SuBrc Central surface brightness
49- 53 F5.2 mag/arcsec2 SuBr0 Extrapolated central disk surface brightness
55- 60 F6.2 mag RMAG Absolute magnitude
62- 65 F4.2 mag e_mag Estimated photometric uncertainty
67- 71 F5.1 arcsec h Disk scale length
73- 76 I4 arcsec d25 25mag/arcsec isophotal diameter
78- 81 I4 arcsec d26.5 ? 26.5mag/arcsec isophotal diameter
83- 85 I3 arcsec r20 Radius within which 20% of light is contained
87- 89 I3 arcsec r50 Radius within which 50% of light is contained
91- 93 I3 arcsec r80 Radius within which 80% of light is contained
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Acknowledgements: Rob Swaters
References:
Swaters et al., Paper I 2002A&A...390..829S 2002A&A...390..829S
(End) Rob Swaters [JHU/STScI], Patricia Bauer [CDS] 07-Nov-2002