Cdrom/AJ/V112/P2471 The Ursa Major Cluster. I. (Tully+ 1996) The Ursa Major Cluster of Galaxies. I




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CDROM/AJ/V112/P2471 The Ursa Major Cluster. I. (Tully+ 1996) ================================================================================ The Ursa Major Cluster of Galaxies. I. Cluster Definition and Photometric Data R. Brent Tully, Marc A. W. Verheijen, Michael J. Pierce, Jia-Sheng Huang and Richard J. Wainscoat <1996, AJ, 112, 2471> =1996AJ....112.2471T ================================================================================ 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. Description: The data in tables 4 and 5 have multiple data records per object and the descriptions for tables 3, 4 and 5 below were supplied by the author in the format given. The descriptions have only been modifed to adhere to standard nomenclature for formats, physical units, and field names. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table2.dat 108 79 Cluster members table4.dat 77 394 Raw photometric data table5.dat 101 236 Reduced photometric data -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 --- PGC *Principal Galaxies Catalogue name 8- 9 2X --- --- Blank 10-17 A8 --- Name *Alternate name 18 1X --- --- Blank 19 A1 --- Flag *[fq] Flag for faintness or membership 20-22 I3 h RAh Right ascension, 1950 23-25 I3 min RAm R.A. 26-30 F5.1 s RAs R.A. 31 1X --- --- Blank 32 A1 --- DE- Declination sign, always blank 33-34 I2 deg DEd Declination, 1950 35-37 I3 arcmin DEm Dec. 38-40 I3 arcsec DEs Dec. 41-48 F8.2 deg GLon Galactic longitude 49-54 F6.2 deg GLat Galactic latitude 55-62 F8.2 deg SGL Supergalactic longitude 63-68 F6.2 deg SGB Supergalactic latitude 69-72 I4 --- Type Numeric type code 73-77 F5.2 mag AB Galactic absorption in B band 78-83 I6 km/s Vhel Heliocentric velocity 84-88 I5 km/s V0 Vhel + 300 sin(l) cos(b) 89-92 I4 km/s e_Vhel Uncertainty in Vhel 93-97 I5 km/s W20 []? Linewidth at 20% of peak flux 98-101 I4 km/s e_W20 []? Uncertainty in W20 102-108 F7.1 Jy.km/s Flux []? HI line flux -------------------------------------------------------------------------------- Notes for file: table2.dat -------------------------------------------------------------------------------- PGC: Decimal extensions given to objects without PGC names Name: Alternate name; order of preference: NGC, UGC or name built from RA and dec. Note: 1148+48 = Mkn 1460; 1156+46 = UGCA 259 Flag: f: galaxies fainter than complete sample limit q: questioned membership -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Byte-by-byte description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- Row 1: 1- 7 A7 --- PGC Principal Galaxies Catalogue name 8-13 I6 --- Type Numeric type code 14-15 2X --- --- Blank 16 A1 --- Filter [B] B filter 17-18 2X --- --- Blank 19-25 A7 --- Date Date of observation, DDMmmYY, e.g. 08Mar86 26-32 F7.2 mag m_iso Raw B magnitude above 27 mag./sq. arcsec. 33-39 F7.2 mag m_tot Raw B magnitude extrapolated to infinity 40-46 F7.2 mag/arcsec2 mu_4 Surf. bright. within 4" ellipse of center 47-53 F7.2 mag/arcsec2 mu_0 Extrapolated disk central surf. brightness 54-59 F6.1 arcsec h []? Exponential disk scale length 60-65 F6.1 arcsec R_20 Radius enclosing 20% of total light 66-71 F6.1 arcsec R_50 Radius enclosing 50% of total light 72-77 F6.1 arcsec R_80 Radius enclosing 80% of total light Row 2: 1- 8 A8 --- Name NGC, UGC, or coordinate name 9-13 I5 deg PA Position angle (east from north) 14-77 Same as row 1; R filter; isophotal mag. is measured above 26 mag/arcsec2 Row 3: 1-13 F13.3 --- Ecc Eccentricity = 1 - (b/a); a=major; b=minor axis 14-77 Same as row 1; I filter; isophotal mag. is measured above 25.5 mag/arcsec2 Row 4: 1-13 I13 arcsec R(B25) Radius at isophotal level of 25 mag/arcsec2 in B 14- 77 Same as row 1; K' filter; isophotal mag. is measured above 23.5 mag/arcsec2 Row 5: 1-77 Empty -------------------------------------------------------------------------------- Byte-by-byte description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- Row 1: 1- 7 A7 --- PGC Principal Galaxies Catalogue name 8-13 I6 --- Type Numeric type code 14-23 F10.2 mag BT^bi Total B magnitude adjusted for galactic and inclination-dependent obscuration 24-31 F8.2 mag RT^bi Total R magnitude adjusted for obscuration 32-39 F8.2 mag IT^bi Total I magnitude adjusted for obscuration 40-47 F8.2 mag K'T^bi []? Total K' magnitude adjusted for obscur. 48-55 F8.2 mag B-R B-R color, adjusted for obscuration 56-61 F6.2 mag B-I B-I color, adjusted for obscuration 62-67 F6.2 mag B-K' []? B-K' color, adjusted for obscuration 68-75 F8.3 --- hR/hB []? Ratio of R and B scale lengths 76-81 F6.3 --- hI/hB []? Ratio of I and B scale lengths 82-87 F6.3 --- hK/hB []? Ratio of K' and B scale lengths 88-93 F6.1 --- Concentration index: ratio of radii containing 80% and 20% of the total light 94-101 F8.2 Lsun logLB log luminosity in B; solar units Row 2: 1- 8 A8 --- Name NGC, UGC, or coordinate name 9-13 I5 deg Incl Inclination from face-on 14-23 F10.2 mag MB^bi Absolute B magnitude; m-M=30.95 24-31 F8.2 mag MR^bi Absolute R magnitude; m-M=30.95 32-39 F8.2 mag MI^bi Absolute I magnitude; m-M=30.95 40-47 F8.2 mag MK^bi []? Absolute K' magnitude; m-M=30.95 48-55 F8.2 mag/arcsec2 mu0(B-R) Diff. B-R central disk surface brightness 56-61 F6.2 mag/arcsec2 mu0(B-I) Diff. B-I central disk surface brightness 62-67 F6.2 mag/arcsec2 mu0(B-K) []? Diff. B-K' central disk surf. bright. 68-75 F8.2 mag/arcsec2 Bmu0-mu4 Diff. surf. bright. of central disk minus mean surf. bright. within 4" ellipse in B 76-81 F6.2 mag/arcsec2 Rmu0-mu4 Diff. surf. bright. of central disk minus mean surf. bright. within 4" ellipse in R 82-87 F6.2 mag/arcsec2 Imu0-mu4 Diff. surf. bright. of central disk minus mean surf. bright. within 4" ellipse in I 88-93 F6.2 mag/arcsec2 Kmu0-mu4 []? Diff. surf. bright. of central disk minus mean surf. bright. within 4" ellipse in K 94-101 F8.2 Lsun logLK []? log luminosity in K' Row 3: 1-101 Empty -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 06-Nov-1996


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