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J/A+AS/134/287 EXMS catalog (Reynolds+ 1999)
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The EXOSAT Medium energy Slew Survey Catalog
Reynolds A.P., Parmar A.N., Hakala P.J., Pollock A.M.T.,
Williams O.R., Peacock A., Taylor B.G.
<Astron. Astrophys. Suppl. Ser. 134, 287 (1999)>
=1999A&AS..134..287R (SIMBAD/NED BibCode)
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ADC_Keywords: X-ray sources ; Surveys
Mission_Name: EXOSAT
Keywords: astronomical databases: miscellaneous - catalogs - X-rays: general
Abstract:
We present a catalog of X-ray sources observed during slew maneuvers
by the Medium Energy Detector Array onboard the EXOSAT Observatory.
The EXOSAT Medium Energy slew-survey catalog (EXMS) provides a unique
record of the 1-8keV X-ray sky between 1983 and 1986. 98% of the sky
was observed, with 85% receiving an exposure of >60s. 1210 sources
were detected. By comparing these source positions with other
catalogs, identifications are given for 992 detections (82% of the
sample). These identifications consist of 250 distinct objects,
including 95 different X-ray binary systems, and 14 different AGN. A
further 58 detections have multiple candidates, while 160 detections
remain unidentified. Collimator transmission corrected 1-8keV count
rates are given for the identified sources, together with raw count
rates for the other detections. The construction of the EXMS and the
checks performed to ensure the validity of the derived source
properties are discussed. A publically available version of this
catalog is maintained on the EXOSAT database and archive system
(telnet://xrayxosat.estec.esa.nl).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 115 992 All singly-identified EXMS entries
table4.dat 132 58 Multiply identified EXMS entries
table5.dat 136 160 Uncertainty regions for unidentified EXMS entries
tables.tex 179 1869 LaTeX version of the tables
tables.ps 72 4924 PostScript version of the tables
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See also:
VI/43 : EXOSAT Observation Log (EXOSAT Obs 1987; Sternberg+ 1986)
telnet://xray@exosat.estec.esa.nl : EXOSAT database
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- EXMS Object designation (1)
17- 18 I2 h RAh Right ascension (2000)
20- 21 I2 min RAm Right ascension (2000)
23- 24 I2 s RAs Right ascension (2000)
26 A1 --- DE- Declination (2000)
27- 28 I2 deg DEd Declination (2000)
30- 31 I2 arcmin DEm Declination (2000)
33- 34 I2 arcsec DEs Declination (2000)
36- 39 I4 yr Detec.Y Time of the detection (year)
40 A1 --- --- [/]
41- 43 I3 d Detec.D [1/365] Time of the detection (day)
45- 46 I2 h Detec.h Time of the detection (hour)
47 A1 --- --- [:]
48- 49 I2 min Detec.m Time of the detection (min)
51- 70 A20 --- Ident Proposed identification (2)
72- 74 A3 --- Type Proposed type (2)
76- 82 F7.1 ct/s CountRate Collimator corrected count rate
84- 88 F5.1 ct/s e_CountRate rms uncertainty on CountRate
90- 96 F7.2 --- xi2 Chi-square of fit to the light curve (3)
98- 99 I2 --- d_xi2 Number of degrees of freedom.
101-107 F7.1 --- lambda Parameter lambda (4)
109 I1 --- F [2,4] Flag values (ranging between 2 and 4)
111-115 F5.1 arcmin Dist Collimator distances (5)
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Note (1): A designation in the form EXMS BHHMM+DDd, where HHMM and DDd are the
RA and Decl. of the uncertainty region centroid in epoch 1950
coordinates. (Note: in order to maximise the usefulness of Tables 3,
4 and 5, all coordinates therein are presented for epoch 2000,
although all prior catalog searches and computations were performed
using epoch 1950 coordinates). Most detections have a unique EXMS
classification. In cases where the classification is not unique,
designators in the form (A), (B), etc are appended. In order to
usefully group identifications, detections have been ordered in RA of
the proposed candidate. Detections with the same coordinate (but
unique designator) may be split between tables depending on the
category of the identification. In cases where an identified source
was observed more than once, the entries are additionally ordered by
detection time.
Note (2): The proposed identifications are given (truncated to 18 characters),
followed by a "type" string which gives the first three letters
of the catalog from which the identification was drawn (see the list
of catalogs above), or the object category. The object categories are
XRB: X-ray binaries
SNR: supernova remnant
CLU: cluster of galaxies
AGN: active galactic nucleus.
In this context we adopt the widest possible meaning of the term AGN,
including Seyfert galaxies, BL Lacertae objects, QSOs, quasars,
Radio Galaxies and Optical Violent Variables (OVVs).
Note (3): Large values of reduced chi-square may indicate source variability.
Note (4): Lambda is the likelihood detection statistic which is the difference
in the logarithm of the likelihood between the best-fit and
null-hypothesis models with no source present.
Note (5): Detections with collimator distances greater than about 30 arcminutes
may contain large errors in their corrected count rates and should be
treated with caution.
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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- 15 A15 --- EXMS Object designation
17- 18 I2 h RAh Right ascension (2000)
20- 21 I2 min RAm Right ascension (2000)
23- 24 I2 s RAs Right ascension (2000)
26 A1 --- DE- Declination (2000)
27- 28 I2 deg DEd Declination (2000)
30- 31 I2 arcmin DEm Declination (2000)
33- 34 I2 arcsec DEs Declination (2000)
36- 39 I4 yr Detec.Y Time of the detection (year)
40 A1 --- --- [/]
41- 43 I3 d Detec.D [1/365] Time of the detection (day)
45- 46 I2 h Detec.h Time of the detection (hour)
47 A1 --- --- [:]
48- 49 I2 min Detec.m Time of the detection (min)
51-102 A52 --- Ident Proposed multiple candidates
104-106 A3 --- Type Proposed type
108-112 F5.1 ct/s CountRate Collimator corrected count rate
114-116 F3.1 ct/s e_CountRate rms uncertainty on CountRate
118-122 F5.2 --- xi2 Chi-square of fit to the light curve
124-125 I2 --- d_xi2 Number of degrees of freedom.
127-132 F6.1 --- lambda Parameter lambda
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- EXMS Object designation
17- 18 I2 h RAh Right ascension (2000)
20- 21 I2 min RAm Right ascension (2000)
23- 24 I2 s RAs Right ascension (2000)
26 A1 --- DE- Declination (2000)
27- 28 I2 deg DEd Declination (2000)
30- 31 I2 arcmin DEm Declination (2000)
33- 34 I2 arcsec DEs Declination (2000)
36- 39 I4 yr Detec.Y Time of the detection (year)
40 A1 --- --- [/]
41- 43 I3 d Detec.D [1/365] Time of the detection (day)
45- 46 I2 h Detec.h Time of the detection (hour)
47 A1 --- --- [:]
48- 49 I2 min Detec.m Time of the detection (min)
51- 57 F7.3 deg RAdeg1 First region right ascension (2000)
59- 64 F6.2 deg DEdeg1 First region declination (2000)
66- 72 F7.3 deg RAdeg2 Second region right ascension (2000)
74- 79 F6.2 deg DEdeg2 Second region declination (2000)
81- 87 F7.3 deg RAdeg3 Third region right ascension (2000)
89- 94 F6.2 deg DEdeg3 Third region declination (2000)
96-102 F7.3 deg RAdeg4 Fourth region right ascension (2000)
104-109 F6.2 deg DEdeg4 Fourth region declination (2000)
111-115 F5.1 ct/s CountRate Collimator corrected count rate
117-119 F3.1 ct/s e_CountRate rms uncertainty on CountRate
121-126 F6.2 --- xi2 Chi-square of fit to the light curve
128-129 I2 --- f_xi2 Number of degrees of freedom.
131-136 F6.1 --- lambda Parameter lambda
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Acknowledgements: Alastair Reynolds <areynold@estsa2.estec.esa.nl>
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(End) Patricia Bauer [CDS] 04-Jan-1999