J/MNRAS/306/857 ROSAT Brightest Cluster Sample. III. (Crawford+, 1999)
The ROSAT Brightest Cluster Sample -
III. Optical spectra of the central cluster galaxies.
Crawford C.S., Allen S.W., Ebeling H., Edge A.C., Fabian A.C.
<Mon. Not. R. Astron. Soc. 306, 857 (1999)>
=1999MNRAS.306..857C 1999MNRAS.306..857C
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts
Mission_Name: ROSAT
Keywords: surveys - galaxies: clusters: general - cooling flows -
galaxies: elliptical and lenticular, cD - galaxies: stellar content -
X-rays: galaxies
Abstract:
We present new spectra of dominant galaxies in X-ray-selected clusters
of galaxies, which combine with our previously published spectra to
form a sample of 256 dominant galaxies in 215 clusters. 177 of the
clusters are members of the ROSAT Brightest Cluster Sample (BCS;
Ebeling et al., 1998MNRAS.301..881E 1998MNRAS.301..881E), and 17 have no previous measured
redshift. This is the first paper in a series correlating the
properties of brightest cluster galaxies and their host clusters in
the radio, optical and X-ray wavebands.
Description:
The BCS is comprised of clusters culled from a positional
cross-correlation of X-ray sources detected in the RASS with the
optical cluster catalogues of Abell and Zwicky, as well as systems
detected as extended X-ray sources in the RASS and confirmed as
clusters using the Palomar Observatory Sky Survey (POSS) and deep
optical CCD imaging (Paper I, Ebeling et al., 1998MNRAS.301..881E 1998MNRAS.301..881E).
The majority of the optical spectra presented in this paper were
acquired during two-week-long runs during 1995 May 03-09 and 1996
December 29 - 1997 January 03. A further six galaxies were observed
during service time on 1998 March 16 and 29. The observations were
made using the Intermediate Dispersion Spectrograph (IDS) on the INT
on La Palma, with the R150V grating on the 235-mm camera to yield an
intermediate-resolution spectrum with a dispersion of 6.5Å/pixel.
In combination with the TEK3 CCD detector, the spectra covered the
observed wavelength range 3300-9500Å with a dispersion of
0.7arcsec/pixel in the spatial direction.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 215 Log of the observations - clusters in the BCS
table2.dat 109 41 Log of the observations - clusters not included
in either the BCS due to their faint X-ray flux,
declination <0, or low Galactic latitude
table3.dat 91 38 Clusters in the BCS for which we do not have a
spectrum of the central cluster galaxy
notes.dat 80 353 Individual notes
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See also:
J/MNRAS/318/333 : Extended ROSAT Bright Cluster Sample (Ebeling+ 2000)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Cluster Cluster name
17- 23 A7 --- m_Cluster Multiplicity index on Cluster
24 A1 --- n_Cluster [+] indicates a note detailed in notes.dat
26- 27 I2 h RAh Right ascension (J2000) of BCG
29- 30 I2 min RAm Right ascension (J2000) of BCG
32- 35 F4.1 s RAs Right ascension (J2000) of BCG
37 A1 --- DE- Declination sign (J2000) of BCG
38- 39 I2 deg DEd Declination (J2000) of BCG
41- 42 I2 arcmin DEm Declination (J2000) of BCG
44- 45 I2 arcsec DEs Declination (J2000) of BCG
47- 52 F6.4 --- z Redshift
53 A1 --- u_z [)] Uncertainty flag on z
55- 57 A3 --- Line Note on lines presence (1)
59- 62 I4 s Exp ? Exposition time
64- 68 F5.3 --- AirM ? Airmass
70- 74 F5.3 mag A(V) ? Absorption in V band
76- 78 I3 deg PA ? Position angle
79 A1 --- n_PA [+] Note on PA (3)
81- 83 A3 --- Ref Reference of previous study of the cluster (4)
85-109 A25 --- Notes Notes
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Note (1): Presence of lines as follows:
x = Optical Hα-line emission
/ = no Hα-line emission
[x] = Clusters that show no obvious line emission, but the expected
Hα and [NII] complex falls within a region of atmospheric
absorption, and we cannot completely rule out very low level
[NII]λλ6548,6584 line emission.
N = only [NII]λλ6548,6584 line emission
Note (3): "+" marks an observation where the position angle of the slit
is known not to be at the parallactic angle.
Note (4): References as follows:
A92 = Allen et al., 1992MNRAS.259...67A 1992MNRAS.259...67A
C95 = Crawford et al., 1995MNRAS.274...75C 1995MNRAS.274...75C
D96 = This paper, observations of December 1996
M95 = This paper, observations of May 1995
M98 = This paper, observations of March 1998
W94 = White et al., 1994MNRAS.269..589W 1994MNRAS.269..589W
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Cluster Cluster name
17- 23 A7 --- m_Cluster Multiplicity index on Cluster
24 A1 --- n_Cluster [+] indicates a note in notes.dat file
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 35 F4.1 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49- 54 F6.4 --- z Redshift
56 A1 --- Line Note on lines presence (1)
58- 62 A5 --- Ref Reference (2)
65- 91 A27 --- Notes Notes
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Note (1): Presence of lines as follows:
x = Optical Hα-line emission
/ = No Hα-line emission
Note (2): References as follows:
DC95 = Davoust & Considere, 1995A&AS..110...19D 1995A&AS..110...19D
DSG92 = Donahue et al., 1992ApJ...385...49D 1992ApJ...385...49D
EHM99 = Ebeling, Henry & Mullis, in preparation:
GB82 = Gregory & Burns 1982ApJ...255..373G 1982ApJ...255..373G
LM89 = Laurikainen & Moles, 1989ApJ...345..176L 1989ApJ...345..176L
LPS92 = Le Borgne, Pello & Sanahuja, 1992A&AS...95...87L 1992A&AS...95...87L
M97 = Maurogordato et al., 1997A&AS..123..411M 1997A&AS..123..411M
OLK95 = Owen et al., 1995AJ....109...14O 1995AJ....109...14O
OWT88 = Owen et al., 1988AJ.....95....1O 1988AJ.....95....1O
P78 = Peterson, 1978ApJ...223...74P 1978ApJ...223...74P
S78 = Sandage, 1978AJ.....83..904S 1978AJ.....83..904S
SR91 = Struble & Rood, 1991, Cat. VII/177
T93 = Tadhunter et al., 1993MNRAS.263..999T 1993MNRAS.263..999T
U76 = Ulrich, 1976ApJ...206..364U 1976ApJ...206..364U
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Cluster Cluster name
16- 80 A65 --- Note text of the note
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History:
Prepared via OCR at CDS.
References:
Ebeling et al., Paper I 1998MNRAS.301..881E 1998MNRAS.301..881E
Ebeling et al., Paper II 1997ApJ...479L.101E 1997ApJ...479L.101E
Ebeling et al., Paper IV 2000MNRAS.318..333E 2000MNRAS.318..333E, Cat. J/MNRAS/318/333
(End) James Marcout, Patricia Bauer [CDS] 05-May-2000