J/ApJS/162/49 UBV imaging of irregular galaxies (Hunter+, 2006)
Broadband imaging of a large sample of irregular galaxies.
Hunter D.A., Elmegreen B.G.
<Astrophys. J. Suppl. Ser., 162, 49-79 (2006)>
=2006ApJS..162...49H 2006ApJS..162...49H
ADC_Keywords: Morphology ; Photometry, UBV ; Galaxies, photometry ;
Photometry, infrared
Keywords: galaxies: fundamental parameters - galaxies: irregular -
stars: formation
Abstract:
We present the results of UBV imaging of a large sample of irregular
galaxies: 94 Im systems, 24 blue compact dwarfs (BCDs), and 18 Sm
galaxies. We also include JHK imaging of 42 of these galaxies. The
sample spans a large range in galactic parameters. Ellipse fit axial
ratios, inclinations, and position angles are derived, integrated
photometry and azimuthally averaged surface photometry profiles are
determined, and exponential fits give the central surface
brightnesses, scale lengths, and isophotal and half-power radii.
Description:
Most of the observations were made with a SITe 2048x2048 CCD binned
2x2 on either the Lowell Observatory 1.1m Hall Telescope or the Lowell
Observatory 1.8m Perkins Telescope. Three galaxies - F565-V2, F563-V1,
and F561-1 - were observed with a TI 800x800 CCD on loan from the US
Naval Observatory, Flagstaff Station, coupled with a 4:1 focal
reducer.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 145 143 *Galaxy sample
refs.dat 105 52 References
table2.dat 153 272 Observations and photometry parameters
table3.dat 111 355 Integrated photometry
table4.dat 97 184 Structural parameters
table5.dat 97 142 Disk characteristics
table6.dat 65 146 Color gradients
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Note on table1.dat: the 7 "Other Objets" galaxies were added to complete
the list of the galaxies studied in tables 2 to 6.
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See also:
J/A+A/388/29 : BR photometry of 25 southern dwarf galaxies (Parodi+, 2002)
J/A+AS/128/459 : BV photometry of irregular galaxies (Makarova+ 1998)
J/AJ/128/2170 : Hα imaging of irregular galaxies (Hunter+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Group Galaxy grouping (broad galaxy type) (G1)
5- 16 A12 --- Name Galaxy name
18- 25 A8 --- MType Morphological Hubble type (1)
27- 31 F5.1 Mpc Dist ? Distance
33- 38 A6 --- r_Dist Reference for Dist (2)
40- 43 F4.2 mag E(B-V)f ? Foreground reddening from
Burstein & Heiles (1984ApJS...54...33B 1984ApJS...54...33B)
45- 48 F4.2 [solMass] logMHI ? Log of the HI gas mass (3)
50- 51 A2 --- r_logMHI Reference for logM (2)
53-145 A93 --- ONames Other names from NED
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Note (1): Morphological Hubble types are from de Vaucouleurs et al. (1991,
Cat. VII/155). If no type is given there, we have used types given
by NED.
Note (2): If no reference is given, the distance was determined from VGSR
given by de Vaucouleurs et al. (1991, Cat. VII/155) and a Hubble
constant of 65km/s/Mpc. Masses were modified to reflect the distances
used here as necessary.
Note (3): Plus 1.34xMHI to account for He.
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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- 2 I2 --- Ref Reference number
4- 22 A19 --- Bibcode Bibcode
24- 57 A34 --- Aut Author's name
59-105 A47 --- Com Comment
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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- 3 A3 --- Group Galaxy grouping (G1)
15- 26 A12 --- Name Galaxy name
28- 32 A5 "YY/MM" ObsDate Date of observation
34- 41 A8 --- Inst Telescope (1)
43- 45 A3 --- Filt Filter(s)
47- 77 A31 s Exp Exposure(s) time(s) (2)
79- 90 A12 arcsec Seeing FWHM of stellar profile on final combined image
92- 95 F4.2 arcsec Scale ? Scale (pixel size)
97-101 F5.1 deg PA [-90,90]? Position angle (3)
103-106 F4.2 --- b/a ? Minor-to-major axis ratio (3)
108-111 F4.1 arcsec Step Ellipse semi-major axis step size (3)
113-114 I2 h RAh Hour of Right Ascension (J2000) (3)
116-117 I2 min RAm Minute of Right Ascension (J2000) (3)
119-123 F5.2 s RAs Second of Right Ascension (J2000) (3)
125 A1 --- DE- Sign of the Declination (J2000) (3)
126-127 I2 deg DEd Degree of Declination (J2000) (3)
129-130 I2 arcmin DEm Arcminute of Declination (J2000) (3)
132-133 I2 arcsec DEs Arcsecond of Declination (J2000) (3)
136-153 A18 --- Calib Calibration RMS of observation(s) (4)
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Note (1): Telescope used, defined as follows:
LO1.8m = 1.8m Perkins Telescope at Lowell Observatory;
LO1.1m = 1.1m Hall Telescope at Lowell Observatory;
KPNO4m = Kitt Peak National Observatory 4m Telescope;
CTIO1.5m = Cerro Tololo Inter-American Observatory 1.5m Telescope;
CTIOSc = Cerro Tololo Inter-American Observatory Schmidt Telescope;
CTIO4m = Cerro Tololo Inter-American Observatory 4m Telescope.
Note (2): Parentheses are used to designate images taken under clear sky
conditions to calibrate the other frames taken under non-photometric
conditions.
Note (3): Used to do photometry in concentric ellipses. The PA given here has
been corrected for the Position Angle of the CCD camera on the sky,
usually about 0.5°, but the Position Angle appropriate to the
image itself was used for the photometry. The positions given are of
the galaxy center.
Note (4): Photometric calibration rms for the filters listed in Column Filt.
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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- 3 A3 --- Group Galaxy grouping (G1)
15- 26 A12 --- Name Galaxy name
28- 32 F5.2 arcmin Rad Radius (1)
34- 40 F7.3 mag VMAG ? Absolute V band magnitude
42- 46 F5.3 mag e_VMAG ? The 1σ error in VMAG
48- 53 F6.3 mag (U-B)0 ? Dereddened (U-B) color index
55- 59 F5.3 mag e_(U-B)0 ? The 1σ error in (U-B)0
61- 66 F6.3 mag (B-V)0 ? Dereddened (B-V) color index
68- 72 F5.3 mag e_(B-V)0 ? The 1σ error in (B-V)0
74- 78 F5.3 mag (V-J)0 ? Dereddened (V-J) color index
80 A1 --- f_(V-J)0 [a] Flag on (V-J)0 (2)
82- 86 F5.3 mag e_(V-J)0 ? The 1σ error in (V-J)0
88- 92 F5.3 mag (J-H)0 ? Dereddened (J-H) color index
94- 98 F5.3 mag e_(J-H)0 ? The 1σ error in (J-H)0
100-105 F6.3 mag (H-K)0 ? Dereddened (H-K) color index
107-111 F5.3 mag e_(H-K)0 ? The 1σ error in (H-K)0
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Note (1): Integrated photometry is given at R1/2V and the total extent of
the V-band image, as well as the total extents in JHK.
Note (2): A "a" indicates that these values are (V-H)0 rather than (V-J)0.
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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- 3 A3 --- Group Galaxy grouping (G1)
15- 26 A12 --- Name Galaxy name (1)
28- 31 F4.2 kpc RD1 ? Primary disk scale-length
33- 36 F4.2 kpc e_RD1 ? The 1σ uncertainty in RD1
38- 42 F5.2 mag/arcsec2 mu1 ? Reddening corrected primary
central surface brightness
44- 47 F4.2 mag/arcsec2 e_mu1 ? The 1σ uncertainty in mu1
49 A1 --- Sec? [ION] Has a secondary fit? (2)
51- 54 F4.2 kpc RBr ? Radius where the primary and
secondary fits cross
56- 59 F4.2 kpc RD2 ? Secondary disk scale-length
61- 64 F4.2 kpc e_RD2 ? The 1σ uncertainty in RD2
66- 70 F5.2 mag/arcsec2 mu2 ? Reddening corrected secondary
central surface brightness
72- 75 F4.2 mag/arcsec2 e_mu2 ? The 1σ uncertainty in mu2
77- 81 F5.2 kpc R25 ? Radius where the reddening-corrected
B band surface photometry reaches
25mag/arcsec2 (3)
83- 87 F5.2 kpc RH ? Holmberg (1958MeLu2.136....1H 1958MeLu2.136....1H) radius
(3)
89- 92 F4.2 kpc R1/2 ? Half light radius (3)
94- 97 F4.2 kpc e_R ? The 1σ error in the radii (4)
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Note (1): Entries on the first line for a galaxy are measured from the V band.
Entries on a second line, if present, are measured from the J band
image. The exception are the "Other Objects", which are measured
only in J band.
Note (2): If the surface photometry was fit with two parts it is noted here as
inward of the primary fit ("I") or outward ("O"). An "N" means that
the surface photometry was fit with only one exponential.
I = inward of the primary fit
O = outward of the primary fit
N = the surface photometry was fit with only one exponential.
Note (3): R25 and RH are measured from reddening-corrected B band surface
photometry. R1/2 is measured from the reddening-corrected V band
surface photometry.
Note (4): The uncertainty in R25, RH, and R1/2 is one-quarter of the annulus
width in the ellipse photometry from which these quantities were
determined. A minimum of 2.5" is imposed, comparable to the average
seeing.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Group Galaxy grouping (G1)
15- 26 A12 --- Name Galaxy name
28- 29 I2 deg Inc Inclination (1)
31- 32 A2 --- Complex Complex µV? (2)
34- 36 A3 --- Pec? [M,C ] Morphological (M) or color (C)
peculiarity
38- 41 F4.2 kpc RBar ? Bar semi-major axis length
43- 46 F4.2 kpc e_RBar ? Uncertainty in RBar
47 A1 --- f_RBar [?] Flag on RBar (3)
49- 51 F3.1 --- Ratio1 ? Ratio of RBar to the disk scale length
53- 56 F4.2 --- b/a ? Bar minor-to-major axis ratio
58- 59 I2 deg DelPA ? Difference in the position angle
between the bar and outer galaxy (4)
61- 64 F4.2 --- Ratio2 ? Ratio of the radial bar center and
outer plane isophote center separation
to the disk scale length (5)
66- 70 F5.2 mag/arcsec2 mu25 ? Average surface brightness within
B band 25mag/arcsec2 isophote (6)
72- 75 F4.2 mag/arcsec2 e_mu25 ? The 1σ uncertainty in mu25
77- 81 F5.2 mag/arcsec2 muD ? Average V band surface brightness
within the scale length (6)
83- 86 F4.2 mag/arcsec2 e_muD ? The 1σ uncertainty in muD
88- 92 F5.2 mag/arcsec2 mu2.5D ? Average V band surface brightness
within 2.5RDV (6)
94- 97 F4.2 mag/arcsec2 e_mu2.5D ? The 1σ uncertainty in mu2.5D
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Note (1): Determined from the b/a in Table 2 under the assumption that
(b/a)_0=0.3 for the irregulars and 0.2 for the spirals.
Note (2): Complex µV, defined as follows:
FI = flat inner part;
FO = flat outer part;
SO = steeper outer part;
SI = steeper inner part.
Note (3): A "?" indicates there is some question as to whether what is seen is a
bar structure. The uncertainty is the maximum amount by which we feel
that the bar length could reasonably be altered based on contour
plots.
Note (4): If no value is given, the outer galaxy was too round to reliably
determine the position angle.
Note (5): An offset less than the seeing of the boxcar-smoothed image was set
to zero.
Note (6): The photometry is normalized to the circular area, that is, πR2.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Group Galaxy grouping (G1)
5- 13 A9 --- Name Galaxy name (1)
15- 17 A3 --- Color Color used
19- 22 F4.2 kpc R1Beg Part 1 beginning radius (2)
24- 28 F5.2 kpc R1End Part 1 ending radius (2)
30- 35 F6.3 mag/kpc Grad1 Part 1 color gradient fit
37- 41 F5.3 mag/kpc e_Grad1 The 1σ uncertainty in Grad1
43- 46 F4.2 kpc R2Beg ? Part 2 beginning radius (2)
48- 52 F5.2 kpc R2End ? Part 2 ending radius (2)
54- 59 F6.3 mag/kpc Grad2 ? Part 2 color gradient fit
61- 65 F5.3 mag/kpc e_Grad2 ? The 1σ uncertainty in Grad2
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Note (1): Surface photometry profiles for some galaxies were fit with two
gradients with different slopes.
Note (2): The range of radii over which the gradient was measured.
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Global Notes:
Note (G1): 94 Im systems, 24 blue compact dwarfs (BCDs), and 18 Sm galaxies,
and 7 Other Objects (OO)
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 30-Aug-2006