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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 71 Galaxy properties
table3.dat 72 71 Derived and observed quantities
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See also:
VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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 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 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 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 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
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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 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)
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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 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 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 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 1996ApJ...461..609S), and a DEF greater
than zero is HI deficient.
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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
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Jan-2009