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J/AJ/112/2471 The Ursa Major cluster. I. (Tully+ 1996)
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The Ursa Major cluster of galaxies. I.
Cluster definition and photometric data
Tully R.B., Verheijen M.A.W., Pierce M.J., Huang J.-S. , Wainscoat R.J.
<Astron. J. 112, 2471 (1996)>
=1996AJ....112.2471T
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ADC_Keywords: Galaxies, photometry ; Photometry, CCD ; Photometry, surface
Abstract:
The Ursa Major Cluster has received remarkably little attention,
although it is as near as the Virgo Cluster and contains a comparable
number of H I-rich galaxies. In this paper, criteria for group
membership are discussed and data are presented for 79 galaxies
identified with the group. Of these, all 79 have been imaged at B,R,I
bands with CCDs, 70 have been imaged at K' with a HgCdTe array
detector, and 70 have been detected in the H I 21 cm line. A complete
sample of 62 galaxies brighter than M_B=-16.5 is identified. Images
and gradients in surface brightness and color are presented at a
common linear scale. As has been seen previously, the galaxies with
the reddest global colors are reddest at the centers and get bluer at
large radii. However, curiously, among the galaxies with the bluest
global colors there are systems with very blue cores that get redder
at large radii.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 108 79 Cluster members
table4.dat 90 307 Raw photometric data
table5.dat 163 79 Reduced photometric data
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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- 7 A7 --- PGC *Principal Galaxies Catalogue <VII/119> name
10- 17 A8 --- Name *Alternate name
19 A1 --- Flag *[fq] Flag for faintness or membership
21- 22 I2 h RAh Right ascension, 1950
24- 25 I2 min RAm Right ascension, 1950
27- 30 F4.1 s RAs Right ascension, 1950
32 A1 --- DE- Declination sign, always blank
33- 34 I2 deg DEd Declination, 1950
36- 37 I2 arcmin DEm Declination, 1950
39- 40 I2 arcsec DEs Declination, 1950
42- 48 F7.2 deg GLON Galactic longitude
50- 54 F5.2 deg GLAT Galactic latitude
56- 62 F7.2 deg SGL Supergalactic longitude
64- 68 F5.2 deg SGB Supergalactic latitude
70- 72 I3 --- Type Numeric type code
74- 77 F4.2 mag AB Galactic absorption in B band
79- 83 I5 km/s Vhel Heliocentric velocity
85- 88 I4 km/s V0 Vhel + 300sin(l)cos(b)
90- 92 I3 km/s e_Vhel Uncertainty in Vhel
94- 97 I4 km/s W20 ? Linewidth at 20% of peak flux
99-101 I3 km/s e_W20 ? Uncertainty in W20
103-108 F6.1 Jy.km/s Flux ? HI line flux
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Note on PGC:
Decimal extensions given to objects without PGC names
Note on Name:
Alternate name; order of preference: NGC, UGC or name built from
RA and dec. Note: 1148+48 = Mkn 1460; 1156+46 = UGCA 259
Note on Flag:
f: galaxies fainter than complete sample limit
q: questioned membership
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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- 7 A7 --- PGC Principal Galaxies Catalogue <VII/119> name
9- 10 I2 --- Type Numeric type code
12- 19 A8 --- Name NGC, UGC, or coordinate name
21- 23 I3 deg PA Position angle (east from north)
25- 29 F5.3 --- Ecc Eccentricity (1-(b/a))
31- 33 I3 arcsec R(B25) Radius at isophotal level of 25mag/arcsec2 in B
35 A1 --- Filter [BRIK] Filter
37- 44 A8 "DD/MM/YY" Date Date of observation
46- 50 F5.2 mag BIso Raw B magnitude above 27 mag/arcsec^2^
52- 56 F5.2 mag BTot Raw B magnitude extrapolated to infinity
58- 62 F5.2 mag/arcsec2 mu4 Surface brightness within 4" ellipse of center
64- 68 F5.2 mag/arcsec2 mu0 Extrapolated disk central surface brightness
70- 73 F4.1 arcsec h ? Exponential disk scale length
75- 78 F4.1 arcsec R20% Radius enclosing 20% of total light
80- 84 F5.1 arcsec R50% Radius enclosing 50% of total light
86- 90 F5.1 arcsec R80% Radius enclosing 80% of total light
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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- 7 A7 --- PGC Principal Galaxies Catalogue <VII/119> name
9- 16 A8 --- Name NGC, UGC, or coordinate name
18- 19 I2 --- Type Numeric type code
21- 25 F5.2 mag BTbi Total B magnitude adjusted for galactic and
inclination-dependent obscuration
27- 31 F5.2 mag RTbi Total R magnitude adjusted for obscuration
33- 37 F5.2 mag ITbi Total I magnitude adjusted for obscuration
39- 43 F5.2 mag K'Tbi ? Total K' magnitude adjusted for obscur.
45- 48 F4.2 mag B-R B-R color, adjusted for obscuration
50- 53 F4.2 mag B-I B-I color, adjusted for obscuration
55- 58 F4.2 mag B-K' ? B-K' color, adjusted for obscuration
60- 64 F5.3 --- hR/hB ? Ratio of R and B scale lengths
66- 70 F5.3 --- hI/hB ? Ratio of I and B scale lengths
72- 76 F5.3 --- hK/hB ? Ratio of K' and B scale lengths
78- 81 F4.1 --- <C82> Concentration index: ratio of radii
containing 80% and 20% of the total light
83- 87 F5.2 [solLum] logLB log luminosity in B; solar units
89- 90 I2 deg Incl Inclination from face-on
92- 97 F6.2 mag MBbi Absolute B magnitude; m-M=30.95
99-104 F6.2 mag MRbi Absolute R magnitude; m-M=30.95
106-111 F6.2 mag MIbi Absolute I magnitude; m-M=30.95
113-118 F6.2 mag MKbi ? Absolute K' magnitude; m-M=30.95
120-123 F4.2 mag/arcsec2 mu0(B-R) Differential B-R central disk surface
brightness
125-128 F4.2 mag/arcsec2 mu0(B-I) Differential B-I central disk surface
brightness
130-133 F4.2 mag/arcsec2 mu0(B-K) ? Differential B-K' central disk
surface brightness
135-139 F5.2 mag/arcsec2 Bmu0-mu4 *Differential surface brightness in B
141-145 F5.2 mag/arcsec2 Rmu0-mu4 *Differential surface brightness in R
147-151 F5.2 mag/arcsec2 Imu0-mu4 *Differential surface brightness in I
153-157 F5.2 mag/arcsec2 Kmu0-mu4 *? Differential surface brightness in K
159-163 F5.2 [solLum] logLK ? log luminosity in K'
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Note on Bmu0-mu4, Rmu0-mu4, Imu0-mu4, Kmu0-mu4:
Differential surface brightness of central disk minus mean surface
brightness within 4" ellipse in the band considered.
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Origin: AAS CD-ROM series, Volume 7, 1996 Lee Brotzman [ADS] 06-Nov-1996
NOTICE: the published version of Table2 differs from the CD-ROM version.
* 26-Nov-1997: a corrected version of table2 was introduced at CDS,
supplied by Marion Schmitz (zb4ms@ipac.caltech.edu)
and by Brent Tully (tully@galileo.IFA.Hawaii.Edu)
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(End) [CDS] 26-Nov-1997