J/ApJ/607/202 Redshift survey of nearby galaxy groups (Mahdavi+, 2004)
A redshift survey of nearby galaxy groups: the shape of the mass density profile
Mahdavi A., Geller M.J.
<Astrophys. J. 607, 202 (2004)>
=2004ApJ...607..202M 2004ApJ...607..202M
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts ; Velocity dispersion
Keywords: galaxies: clusters: general - galaxies: kinematics and dynamics -
galaxies: statistics
Abstract:
We constrain the mass profile and orbital structure of nearby groups
and clusters of galaxies. Our method yields the joint probability
distribution of the density slope n, the velocity anisotropy β,
and the turnover radius r0 for these systems. The measurement
technique does not use results from N-body simulations as priors. We
incorporate 2419 new redshifts (included here) in the fields of 41
systems of galaxies with z<0.04.
Description:
We obtained spectra of the 2419 target galaxies with the FAST single
object spectrograph on the 1.5m Tillinghast Reflector at Whipple
Observatory on Mount Hopkins, Arizona.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 41 Newly Observed Systems
table2.dat 52 2419 Galaxy Positions and Velocities
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
J/ApJ/518/69 : Deep Optical Catalog of galaxy systems (Mahdavi+, 1999)
J/ApJ/534/114 : RASSCALS: X-ray and optical study (Mahdavi+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_RASSCALS [*] position differs from that in Mahdavi
et al., 2000, Cat. J/ApJ/534/114 (G1)
2- 8 A7 --- RASSCALS System designation
9 A1 --- n_RASSCALS [ab] Note on name (1)
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 20 F4.1 s RAs Right ascension (J2000.0)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0)
26- 27 I2 arcmin DEm Declination (J2000.0)
29- 32 F4.1 arcsec DEs Declination (J2000.0)
34- 36 I3 --- Nobs Number of galaxies whose redshifts were
measured in this work
38- 40 I3 --- Nmemb Number we identify as group members
42- 46 I5 km/s cz Mean group heliocentric redshift
48- 50 I3 km/s e_cz rms uncertainty on cz
52- 54 I3 km/s sigmaz Velocity dispersion
56- 58 I3 km/s e_sigmaz rms uncertainty on sigmaz
60 A1 --- l_logLX Limit flag on logLX
61- 66 F6.3 [10-7W] logLX X-ray luminosity in the 0.1-2.4keV band,
in (h100-1)*erg/s
68- 71 F4.2 [10-7W] e_logLX ? rms uncertainty on logLX
73- 86 A14 --- OName Other designation
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Note (1): Notes mean the following:
a = The data for these groups appeared originally in Mahdavi et al.
(1999, Cat. J/ApJ/518/69); however, our algorithm for
determining group membership differs from the one used in that
work, and hence the total number of members varies slightly.
In addition, Nobs in our table differs from NTotal in Mahdavi et
al. (1999, Cat. J/ApJ/518/69) because we list the actual number
of galaxies observed, rather than the number in the field
brighter than a given magnitude.
The RASSCALS name (this paper) is NOT corresponding to the
DOC name (Mahdavi+, 1999, J/ApJ/518/69).
b = Because of their large velocity dispersions, these systems were
grouped with the rich clusters in Table 3 for our analysis.
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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 --- RASSCALS System designation (1)
8 A1 --- --- [.]
9- 11 I3 --- Galaxy Galaxy sequential number in the system (1)
13- 14 I2 h RAh Hour of Right Ascension (J2000)
16- 17 I2 min RAm Minute of Right Ascension (J2000)
19- 22 F4.1 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 32 I2 arcsec DEs Arcsecond of Declination (J2000)
34- 38 I5 km/s cz Redshift velocity
40- 42 I3 km/s e_cz Measurement error in Redshift
44- 49 F6.3 Mpc Dist Distance from the X-ray center (2)
52 A1 --- Memb [MN] Member (M) or non-member (N)
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Note (1): The galaxy name consists of the group name plus a three-digit
identifier. The list is sorted by right ascension.
Galaxies are identified as RASSCALS SS2aNNN.NNN, RASSCALS SRGaNNN.NNN
and RASSCALS NRGaNNN.NNN in Simbad.
Each of the following pairs of entries represents two separate
measurements of the same galaxy: SRGb145.047 and SRGb149.002;
SRGb145.049 and SRGb149.003; SRGb145.052 and SRGb149.010;
SRGb145.050 and SRGb149.005; SRGb145.054 and SRGb149.011.
All other entries represent unique galaxies.
Note (2): Assuming H0=100km/s/Mpc. Distances greater than 1.5Mpc occur
because of differences between the optical center of the group
(used to select targets for the survey) and the X-ray center
of the group (used to calculate the distance in this table).
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Global notes:
Note (G1): (added by CDS) For 4 clusters, the position differs from
that in Mahdavi et al., 2000, J/ApJ/534/114:
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Name M2000 This paper
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NRGb025 09 13 54.9 +30 00 38 09 13 28.3 +30 06 13.7
NRGb057 09 43 56.7 +36 17 13 09 44 28.1 +36 08 55.7
NRGs156 11 45 33.3 +33 14 46 11 46 16.3 +33 11 03.1
SRGb158 02 55 09.9 +09 16 43 02 55 51.0 +09 18 48.4
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Nov-2004