J/A+AS/132/255 A catalogue of Mg2 indices (Golev+ 1998)
A catalogue of Mg2 indices of galaxies and globular clusters
Golev V., Prugniel P.
<Astron. Astrophys. Suppl. Ser. 132, 255 (1998)>
=1998A&AS..132..255G 1998A&AS..132..255G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs; Clusters, globular; Bibliography
Keywords: galaxies: general - galaxies: star clusters - galaxies:
stellar content
Description:
We present a catalogue of published absorption-line Mg2 index
measurements of galaxies and globular clusters. The catalogue consists
in four tables and is maintained up-to-date in the database HYPERCAT
(http://www-obs.univ-lyon1.fr/~prugniel/cgi-bin/hypercat/).
The measurements are listed together with the references to the
original articles where the data were published. A coded description
of the observations is provided. Compiled raw data are aperture-
corrected and, when it is possible, transformed to the homogeneous
system. The zeropoints and re-scaling of errors are provided. The
catalogue gather in total 3706 measurements for 1409 objects from
70 datasets. Total of 46 different publications were used to compile
the catalogue.
This catalogue will be updated. Check at the above given URL for
recent version.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 3705 Catalogue of raw/compiled data
table2.dat 75 70 Dataset parameters
table3.dat 178 70 Bibliography for table1 and table2
table4.dat 53 1119 Catalogue of homogeneous data
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See also:
http://www-obs.univ-lyon1.fr/~prugniel/cgi-bin/hypercat/ :
the HYPERCAT database
J/A+AS/128/299 : Prugniel & Heraudeau, 1998, Photometry of galaxies
J/A+A/309/749 : Prugniel & Simien, 1996, Fundamental plane of
early type galaxies
J/A+AS/127/117 : Prugniel et al., 1998, Kinematics of galaxies
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name *Normalized galaxy identifier
13 A1 --- Object *[GCS] Object type flag
15- 16 I2 h RAh ? Right Ascension 1950 (hours)
17- 18 I2 min RAm ? Right Ascension 1950 (minutes)
19- 22 F4.1 s RAs [0,60]? Right Ascension 1950 (seconds)
23 A1 --- DE- ? Declination 1950 (sign)
24- 25 I2 deg DEd ? Declination 1950 (degrees)
26- 27 I2 arcmin DEm ? Declination 1950 (minutes)
28- 29 I2 arcsec DEs ? Declination 1950 (seconds)
31- 36 F6.3 mag Mg2 *Mg2 index strength
37- 42 F6.3 mag e_Mg2 *?=0.0 Uncertainty of Mg2 index strength
44- 50 A7 --- Dat_a *Dataset acronym
52 I1 --- f_Mg2 *[0/4] Measurement status flag
54- 59 F6.3 mag acMg2 *? Corrected Mg2 index strength
60- 65 F6.3 mag e_acMg2 *? Uncertainty on corrected Mg2
67-108 A42 --- Notes *Description
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Note on Name:
The Name has been adopted by descending the hierarchy:
1) NGC (See Cat. VII/118)
2) IC (See Cat. VII/118)
3) UGC (Cat. VII/26) or ESO (Cat. VII/34)
4) PGC (Cat. VII/119) Lyon-Meudon Extragalactic Database internal
identifier, also acronimed PGC for numbers greater than 73097.
The objects left unfolded into this hierarchy are designated as in
the SIMBAD/NED name's nomenclature or as in the original reference.
The galaxy identifiers follow the rule already used in Prugniel &
Simien 1996 (Cat. J/A+A/309/749) and in Prugniel et al. 1998
(Cat. J/A+AS/127/117).
Note on Object:
The type of the object (G=galaxy, C=cluster, S=star). S is used only
in the Huch+96 dataset (1996ApJS..102...29H 1996ApJS..102...29H) where the measurements
of several stars are also reported.
Note on Mg2:
The Mg2-index in magnitudes, corrected (or not) by the authors.
Note on e_Mg2:
The error on Mg2 index in magnitudes. When available, 0.000 means
no error reported by the authors.
Note on Dat_a:
Dataset acronym which refers to the observational parameters in
table2, as well as to the full bibliographic reference in table3.
Note on f_Mg2:
The status flag of Mg2 index measurement which means
as follows: 0= regular measurement;
1= discrepant measurement;
2= preliminary or republished measurement;
3= spatial resolution much higher;
4= compilation value.
Note on acMg2:
The aperture corrected and zero-pointed value of the Mg2 index.
The field is blank if there is no corrected value (e.g. for
globular clusters).
Note on e_acMg2:
The internal error is rescaled. If no error is given by the author,
we assumed 0.01 (before rescaling). For dataset not included in the
standard system, we multiplied the error by sqrt(2).
Note on Notes:
Author's or alternative identifier, descriptive notes.
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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- 19 A19 --- Bibcode NED/CDS reference code (2)
21- 27 A7 --- Dat_a *Dataset acronym
29 I1 --- Dat_c [0,2] Correction method flag (3)
31- 36 F6.2 arcsec Aper_x Aperture size in X direction (4)
38- 43 F6.2 arcsec Aper_y Aperture size in Y direction (4)
44- 49 F6.3 mag ExtErr *Estimated external error
51- 56 F6.3 mag ZeroPt Zero-point correction (5)
57- 62 F6.3 mag IntErr Rescaled internal error (5)
65- 67 I3 --- Nmeas Number of measurements in dataset (1)
70- 72 I3 --- Ncomp Number of comparison galaxies (6)
74 I1 --- Hmgn_f [0,1] Homogenisation flag (7)
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Note on Dat_a:
Refers to table1 and table3.
See the note on Dat_a of table1.
Note on ExtErr:
rms of the difference between the corrected measurements and the
mean value for each galaxy.
Note (1):
The number of measurements reported in the dataset. Not always equal
to the number of observed objects (there are datasets which include
multiple measurements of one object).
Note (2):
Different datasets in one reference can exist.
Sorted alphabetically.
Note (3):
Flag for aperture correction of the dataset:
0= no aperture correction;
1= aperture corrected as in Davies et al. (1987ApJS...64..581D 1987ApJS...64..581D).
The reference is the distance of the Coma cluster;
2= aperture corrected as in Jorgensen et al. (1995MNRAS.276.1341J 1995MNRAS.276.1341J).
The reference is the distance of the Coma cluster;
Note (4):
The aperture sizes X x Y in arcsec. For datasets which have been
aperture corrected Dat_c = [1,2], the aperture, Aper_x and Aper_y
is the projected size at the distance of the Coma cluster.
Note (5):
The dataset mean zero-point correction (corrected catalogue - dataset
average), the r.m.s. error on it, and the corresponding rescaled internal
error of the dataset. Iteratively, for each galaxy in the catalog, the
error-weighted average of Mg2 is computed (using the internal error)
and the mean is determined as well as the rms residual for each dataset
after summing over all galaxies. The mean residual give the zero-point
for the considered dataset, and its rms is an estimate of the external
error. The comparison between the external error and the mean internal
error allows to rescale the latter.
Note (6):
The number of galaxies used for comparison with the homogeneous system.
Note (7):
When 1, the corresponding dataset is corrected (zero-point)
and rescaled to the homogeneous system of Mg2 values listed in
table4 - otherwise 0. In the last case the fields of the
zero-point correction, its r.m.s. error, and rescaled error,
as well as the number of comparison galaxies, contain also 0.
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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 --- Dat_a *Dataset acronym
9- 27 A19 --- Bibcode CDS/NED reference code
29-178 A150 --- Refer Full bibliographic reference
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Note on Dat_a:
Sorted alphabetically. Refers to table1 and table2.
See the note on Dat_a of table1 and table2
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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- 11 A11 --- Name *Normalized galaxy identifier
13- 14 I2 h RAh Right Ascension 1950 (hours) (1)
15- 16 I2 min RAm Right Ascension 1950 (minutes)
17- 20 F4.1 s RAs [0,60] Right Ascension 1950 (seconds)
21 A1 --- DE- Declination 1950 (sign)
22 -23 I2 deg DEd Declination 1950 (degrees)
24 -25 I2 arcmin DEm Declination 1950 (minutes)
26 -27 I2 arcsec DEs Declination 1950 (seconds)
28- 35 F8.0 km/s RV Flow-smoothed corrected velocity (2)
37- 42 F6.3 mag Mg2 Homogeneous Mg2 index strength (3)
43- 48 F6.3 mag e_Mg2 Uncertainty of Mg2 index strength
50- 51 I2 --- o_Mg2 Number of individual measurements
53 I1 --- f_Mg2 [0,1] Homogenisation flag (4)
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Note on Name:
See the note on Name of table1.
Note (1):
Sorted by increasing of R.A.
Note (2):
The flow-smoothed velocity used for aperture correction (defined
as the velocity of the cosmologic flow associated with the galaxy).
It is determined iteratively by averaging the velocity of galaxies
found in the neigborhood of given galaxy. At each step the size of
the neighbouring region (in radius on the sky and in velocity interval)
is computed from the distribution of the galaxies grouped at the
previous step. The source of velocities is HYPERCAT (in turn updated
from LEDA). The flow-smoothed velocity is then corrected for the
deviations from the linear flow assuming the three-component velocity
field model (Great Attractor, Virgocentric infall and Local Group
Anomaly) described in Faber & Burstein (1988, in: Large-scale motions
in the universe. Princeton, NJ, Princeton University Press, 1988, p.115)
and Burstein et al. (1989, in: Large scale structure and motions in the
universe; Proceedings of the International Meeting, Trieste, Italy,
Apr. 6-9, 1988, ed. by Mezetti, M.; Dordrecht, Kluwer Academic Publishers,
1989, p.179).
Note (3):
Mean homogeneous value of the Mg2 index.
Note (4):
When 1, the corresponding Mg2 value for the object is corrected
(zero-point) and rescaled to the homogeneous system of
Mg2 values. Otherwise 0. We put here 1 if at least one of the
datasets used to compute the homogeneous Mg2 value has a homogenisation
flag 1 in table2.
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Acknowledgments: Valeri Golev
(End) Philippe Prugniel [Obs. Lyon] 23-Jul-1998