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J/AJ/133/1104       HI 21cm observations of Pegasus galaxies      (Levy+, 2007)

The effect of cluster environment on galaxy evolution in the Pegasus I cluster. Levy L., Rose J.A., Van Gorkom J.H., Chaboyer B. <Astron. J., 133, 1104-1124 (2007)> =2007AJ....133.1104L
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Radio lines ; Morphology Keywords: galaxies: clusters: general - galaxies: evolution - galaxies: ISM - radio lines: galaxies Abstract: We present neutral hydrogen observations of 54 galaxies in the Pegasus Cluster. The observations include single-dish HI measurements, obtained with the Arecibo telescope for all 54 galaxies in the sample, as well as HI images obtained with the Very Large Array (VLA) for 10 of these. Description: HI 21cm line observations were obtained with the Arecibo 305m telescope of 54 galaxies in the Pegasus I Cluster. Forty-six of these Pegasus galaxies, as well as the 17 non-Pegasus I galaxies that form a reference sample, were observed in 2002 September using the dual circular L-narrow receiver, with the four subcorrelators covering a frequency range of 25MHz, with 2048 channels, resulting in a resolution of 2.6km/s. Eight galaxies were observed in 2004 October using the dual linear L-wide receiver, with 1024 channels, and a resolution of 5.3km/s. HI 21cm line observations were made in 2004 April and May using the CS configuration of the Very Large Array (VLA) with spacings ranging from 0.035 to 3.4km. The observations were pointed at nine galaxies individually, and one pointing was centered at the center of the Pegasus Cluster. We also have optical imaging of NGC 7604 and NGC 7648. The optical Hα, B-band, and I-band images were taken with the 2.4m MDM telescope in 2001 September, using the MDM 8Kx8K mosaic CCD camera, with a pixel size of 15um. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 79 71 Galaxy properties table3.dat 72 71 Derived and observed quantities
See also: VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 A1 --- Cl [BCFN] Associated cluster flag (G1) 3- 14 A12 --- Name Galaxy name (NGC or alternate name) 16- 18 A3 --- --- [UGC] 19- 23 A5 --- UGC The UGC name (Cat. VII/26) 25- 26 I2 h RAh Hour of Right Ascension (J2000) 28- 29 I2 min RAm Minute of Right Ascension (J2000) 31- 34 F4.1 s RAs Second of Right Ascension (J2000) 36 A1 --- DE- Sign of Declination (J2000) 37- 38 I2 deg DEd Degree of Declination (J2000) 40- 41 I2 arcmin DEm Arcminute of Declination (J2000) 43- 44 I2 arcsec DEs Arcsecond of Declination (J2000) 46- 49 I4 km/s HV Heliocentric 21cm velocity (1) 51- 53 A3 --- Ttype de Vaucouleurs (RC3) morphological type (2) 55 A1 --- r_Ttype Reference for Ttype (G2) 57- 61 F5.2 mag Pmag Apparent blue magnitude (4) 63 A1 --- r_Pmag Reference for Pmag (5) 65- 67 F3.1 arcmin a Blue semi-major axis 69 A1 --- r_a Reference for a (6) 71- 75 F5.3 --- b/a Semi-major to semi-minor axis ratio 77- 79 I3 km/s DelV Velocity width (7)
Note (1): Obtained from NED. The NED velocities agree well with the Arecibo profiles, except for NGC7615, where we use the velocity obtained from the Arecibo profile. Note (2): Ignoring the presence of bars. Note (4): Corrected for galactic extinction, internal extinction, and redshift correction as prescribed in Buta (1996AJ....111..591B). Note (5): Pmag reference as follows: a = corrected magnitude obtained using the RC3 (VII/155) catalogue; b = the uncorrected magnitude is obtained using the UGC (VII/26), and corrected for galactic extinction, internal extinction, and redshift correction as prescribed in Buta (1996AJ....111..591B) c = uncorrected magnitude, obtained from the Zwicky (VII/49) catalog, and corrected for galactic extinction, internal extinction, and redshift correction as prescribed in Buta (1996AJ....111..591B) d = uncorrected magnitude, obtained from the Flat Galaxy Catalogue (See Cat. VII/219), and corrected for galactic extinction, internal extinction, and redshift correction as prescribed in Buta (1996AJ....111..591B) Note (6): a reference as follows: a = obtained using the UGC (VII/26) catalogue b = measured by the authors using the Palomar Sky Survey prints Note (7): Defined as 20% of the peak and determined from the Arecibo HI profiles
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1 A1 --- Cl [BCFN] Associated cluster flag (G1) 3- 14 A12 --- Name Galaxy name (NGC or alternate name) 16 A1 --- n_Name [*] Arecibo 2004-Oct observation (1) 18- 20 A3 --- --- [UGC] 21- 25 A5 --- UGC The UGC name (Cat. VII/26) 27- 29 A3 --- Ttype de Vaucouleurs (RC3) morphological type (G2) 31- 32 I2 min Texp Arecibo HI profile exposure time 36- 37 A2 --- l_Flux [≤ ] Limit flag on Flux 38- 41 F4.1 Jy.km/s Flux Arecibo HI profile 21 cm flux (3) 43- 45 F3.1 Jy.km/s e_Flux Uncertainty in Flux 47- 51 F5.2 [solMass] logM Log of the HI mass (4) 53- 57 F5.2 [solLum] logL Log of the blue luminosity (5) 59- 62 F4.2 [kpc2] logD2 Log of the linear optical diameter squared (6) 64- 67 A4 --- f_DEF Limit flag on DEF 68- 72 F5.2 --- DEF ? The HI deficiency factor (7)
Note (1): the asterisk indicates Arecibo observations taken on the second observing run in October 2004 (see Section 2.4). Note (3): Corrected for pointing errors and aperture adjustments. The error in the pointing is less than 5 arcseconds. The aperture correction is 2% Note (4): Where (MHI/Msun)=2.36*105(Flux/Jy.km/s)(D/Mpc)2 and the distance to each galaxy is taken as the distance to the Pegasus I cluster center. Using an H0 of 100km/s/Mpc, results in a distance to Pegasus I of 40Mpc. Note (5): Where LBsun=5.37 (Stebbins & Kron, 1957ApJ...126..266S), and with Pmag in Table 2. Note (6): The linear optical diameter is the UGC blue semi-major axis (from Table 2) converted to kpc (Solanes, Giovanelli & Haynes, 1996ApJ...461..609S): (D0/kpc)=0.291(D/Mpc)(a/arcmin) Note (7): Calculated following the method prescribed by Solanes, Giovanelli & Haynes (1996ApJ...461..609S). DEF=log(MHI)exp-log(MHI)obs where the expected value is calculated using Table 2 in Solanes, Giovanelli & Haynes (1996ApJ...461..609S), and a DEF greater than zero is HI deficient.
Global notes: Note (G1): Associated cluster flag as follows: B = Background Cluster C = Central Cluster F = Foreground Cluster N = Non-Pegasus Spirals Note (G2): Type reference as follows: a = obtained using the RC3 (VII/155) catalogue b = measured by the authors using the Palomar Sky Survey prints
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Jan-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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