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J/ApJ/534/114 RASSCALS: X-ray and optical study (Mahdavi+, 2000)
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The RASSCALS: an X-ray and optical study of 260 galaxy groups.
Mahdavi A., Bohringer H., Geller M.J., Ramella M.
<Astrophys. J. 534, 114 (2000)>
=2000ApJ...534..114M
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ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts ; Velocity dispersion
Keywords: galaxies: clusters: general - galaxies: statistics
Abstract:
We describe the ROSAT All-Sky Survey Center for Astrophysics Loose
Systems (RASSCALS), the largest X-ray and optical survey of low-mass
galaxy groups to date. We draw 260 groups from the combined Center for
Astrophysics and Southern Sky Redshift Surveys, covering one-quarter
of the sky to a limiting Zwicky magnitude of m_z_=15.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 89 260 *The RASSCALS: Basic Properties
table3.dat 76 59 *The RASSCALS: Detailed Properties
table4.dat 30 25 Cluster data
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Note on table2.dat: The data in this table replace the preliminary analysis of
the X-ray data in Mahdavi et al., 1999, Cat. <J/ApJ/518/69>.
Note on table3.dat: Data for the detected groups, excluding the optically
spoiled clusters NRGs372 and NRGs392. The 0.1-2.4 keV X-ray luminosities
are computed within 0.25h_100_^-1^Mpc and 0.5h_100_^-1^Mpc, as well as
within the NOCORE radius, Rxi.
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See also:
J/ApJ/518/69 : Deep Optical Catalog of galaxy systems (Mahdavi+, 1999)
Table 1: Sky Coverage of the Optical Group Catalog
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Field Name RA (2000) DE
(h) (deg)
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NRG 8.5-17 8.5-43.5
SRG 21.5-03 -2-32
SS2 a 21-05 -40-1.5
SS2 b 10-15 -26-0
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Notes: a: First portion, excluding sections with Galactic latitude b<40{deg}
b: Second portion, excluding sections with Galactic latitude b<40{deg}
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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 Object designation (1)
9- 10 I2 h RAh Right ascension (J2000.0) (2)
12- 13 I2 min RAm Right ascension (J2000.0)
15- 18 F4.1 s RAs Right ascension (J2000.0)
20 A1 --- DE- Declination sign (J2000.0)
21- 22 I2 deg DEd Declination (J2000.0)
24- 25 I2 arcmin DEm Declination (J2000.0)
27- 28 I2 arcsec DEs Declination (J2000.0)
30- 32 I3 --- N Number of group members
34- 37 I4 --- N17 Number of group members brighter than an
absolute magnitude M_Z_=-17, corresponding to
m_Z_=15.5 for a group at cz=3200km/s
39- 43 I5 km/s cz Recession velocity
45- 47 I3 km/s e_cz rms uncertainty on cz
49- 52 F4.2 [km/s] logsigmap Velocity dispersion of the dark matter halo
in which the galaxies are embedded
54- 57 F4.2 [km/s] e_logsigmap rms uncertainty on logsigmap
59 A1 --- l_logLX Limit flag on logLX
60- 64 F5.2 [10-7W] logLX ? X-ray luminosity (in h_100_^-2^erg/s) (3)
66- 69 F4.2 [10-7W] e_logLX ? rms uncertainty on logLX
70 A1 --- n_logLX [d] Note (4)
72- 91 A20 --- Names Other identifications (5)
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Note (1): We first assign each system a seven-character name, beginning
with "NRG," "SRG," or SS2," followed by "b" or "s" (specifying the
angular size of the system as "big," with cz<8500km/s or "small," with
cz>8500km/s, respectively), followed by a three-digit number.
Note (2): For the 59 groups with a listed X-ray luminosity, we report
the X-ray centroid; for the others we report the mean RA and DE of the
galaxies in the group.
Note (3): Luminosity in the 0.1-2.4keV band within an aperture
Note (4): Two X-ray luminous Abell clusters which the optical group
finding algorithm has confused with the field. We count these as
detections but do not calculate their other X-ray properties.
Note (5): By no means complete.
A: Abell (Cat. <VII/4>) cluster
AWM: Albert et al. (1977ApJ...211..309A) Groups
HCG: Hickson Compact Groups (Hickson, 1982, Cat. <VII/213>)
MGBR: Studied in greater detail in Mahdavi et al. 1999
MKW: Morgan, Kayser, & White (1975ApJ...199..545M) Groups
PPS: Loose Groups in the Perseus-Pisces Survey
(Trasarti-Battistoni, 1998, Cat. <J/A+AS/130/341>)
ZM: Zabludoff & Mulchaey (1998, Cat. <J/ApJ/496/39>) Poor Groups
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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- 7 A7 --- RASSCALS Object designation
9- 12 F4.2 [km/s] logsigmap Pojected velocity dispersion
14- 17 F4.2 [km/s] e_logsigmap rms uncertainty on logsigmap
19- 23 F5.2 [10-7W] logLX(0.25) X-ray luminosity within 0.25h_100_^-1^Mpc (1)
25- 28 F4.2 [10-7W] e_logLX(0.25) rms uncertainty on logLX(0.25) (1)
30- 34 F5.2 [10-7W] logLX(0.5) X-ray luminosity within 0.5h_100_^-1^Mpc (1)
36- 39 F4.2 [10-7W] e_logLX(0.5) rms uncertainty on logLX(0.5) (1)
41- 45 F5.2 [10-7W] logLX(Rxi) X-ray luminosity at NOCORE radius (1)
47- 50 F4.2 [10-7W] e_logLX(Rxi) rms uncertainty on logLX(Rxi) (1)
52- 55 F4.2 Mpc Rxi NOCORE radius of detected groups (2) (3)
57- 60 F4.2 Mpc e_Rxi rms uncertainty on Rxi
62- 66 F5.2 --- logtc Crossing time (=Rxi*H_0_/{sigma}_p_) (2)
68- 71 F4.2 --- e_logtc rms uncertainty on logtc
73- 76 F4.2 --- fsp Fraction of group member that are spiral
galaxies
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Note (1): in h_100_^-2^ergs/s
Note (2): in H_0_^-1^
Note (3): NOCORE: Nonparametric Core Radius Estimator (Mahdavi, 2000, in prep.)
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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- 8 A8 --- Cluster Cluster name
10- 14 F5.3 --- z Redshift
16- 20 F5.2 10-7W logLX 0.1-2.4 keV band X-ray luminosity (1)
22- 25 F4.2 [km/s] logsigmap Projected dispersion velocity (2)
27- 30 F4.2 [km/s] e_logsigmap rms uncertainty on logsigmap
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Note (1): X-ray luminosity from Markevitch, 1998ApJ...504...27M, in
h_100_^-2^ergs/s. We take uncertainty in the luminosities to be 20%.
Note (2): From Fadda et al., 1996ApJ...473..670F.
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History: From ApJ electronic version
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(End) James Marcout, Patricia Bauer [CDS] 31-Aug-2000