J/A+A/439/413 XMDS/VVDS 4σ catalogue (Chiappetti+, 2005)
The XMM-LSS survey: The XMDS/VVDS 4σ catalogue.
Chiappetti L., Tajer M., Trinchieri G., Maccagni D., Maraschi L.,
Paioro L., Pierre M., Surdej J., Garcet O., Gosset E., Le Fevre O.,
Bertin E., McCracken H.J., Mellier Y., Foucaud S., Radovich M., Ripepi V.,
Arnaboldi M.
<Astron. Astrophys. 439, 413 (2005)>
=2005A&A...439..413C 2005A&A...439..413C
ADC_Keywords: Surveys ; X-ray sources ; QSOs
Keywords: X-ray: general - surveys - quasars: general - catalogs
Description:
We present a catalogue of 286 X-ray sources with their optical
identification taken from the XMDS survey (using the XMM-Newton EPIC
instrument). This first version is limited to sources detected at
4σ at least in one energy band, AND falling in the area covered
by the optical VVDS survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
xmds1.dat 160 364 The XMDS catalogue
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2002)
J/A+A/403/857 : VLA-VIRMOS Deep Field (Bondi+, 2003)
J/ApJ/591/640 : XMM-LSS low-frequency radio counterparts (Cohen+, 2003)
Byte-by-byte Description of file: xmds1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq *Internal sequence identifier
6- 9 A4 --- --- [XMDS]
11- 26 A16 --- XMDS *Catalog name of the object
28- 29 I2 h RAh Right ascension (J2000)
31- 32 I2 min RAm Right ascension (J2000)
34- 37 F4.1 s RAs Right ascension (J2000)
39 A1 --- DE- Declination sign (J2000)
40- 41 I2 deg DEd Declination (J2000)
43- 44 I2 arcmin DEm Declination (J2000)
46- 49 F4.1 arcsec DEs Declination (J2000)
51- 56 F6.1 ct CountB Number of net counts in 0.5-2keV band
58- 61 F4.1 ct e_CountB Error on CountB
63- 67 F5.1 ct CountCD Number of net counts in 2-10keV band
69- 72 F4.1 ct e_CountCD Error on CountCD
74- 78 F5.1 10-18W/m2 FluxB Flux in 0.5-2keV band
80- 84 F5.1 10-18W/m2 FluxCD flux in 2-10keV band
86- 87 A2 --- bBand *[A B CD] band which has highest S/N ratio
89 I1 --- Gap *[0/2]? Gap flag
91 I1 --- Rank *[0/4] Identification rank
93- 96 F4.1 arcsec DistXO *? Distance between X-ray source and
counterpart
98-102 F5.2 mag Rmag *? R magnitude of counterpart
104-107 F4.2 mag e_Rmag ? Error on Rmag
109-113 F5.2 mag Imag *? I magnitude of counterpart
115-118 F4.2 mag e_Imag ? error on Imag
120 I1 --- Opt *[0/2]? photometry reliability flag
122 A1 --- VR *[V] Presence of radio counterpart in
VIMOS1.4GHz (J/A+A/403/857)
124 A1 --- LR *[L] Presence of radio counterpart in
XMM-LSS 325MHz (J/ApJ/591/640)
126-155 A30 --- CatName *Name of counterpart in external catalogues
157-160 I4 --- --- Repetition of Seq column
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Note on Seq:
If the X-ray source has more possible counterparts, all X-ray columns
from Name to Gap are repeated.
Note on XMDS:
Name of the object, built from uncorrected J2000 coordinates as
provided by the XMM-SAS. The coordinate columns actually provide
corrected positions which frequently differ from the last digits
in the RA and DEC parts of the name.
Note on bBand:
The X-ray energy band which has the best S/N ratio is coded as follows:
A = 0.3-0.5 keV
B = 0.5-2.0 keV
C = 2.0-4.5 keV
D = 4.5-10 keV
CD = 2-10 keV
Note on Gap:
This flag indicates the reliability of the X-ray flux, due to the fact
the source falls on inter-CCD gaps in one or more of the EPIC cameras,
or close to the edge (or outside) of the FOV of one EPIC camera and is
based on the ratio of the punctual exposures in each camera to the
maximum exposure in the FOV also for each camera.
The coding is as follows:
0 = maximum reliability, no problems
1 = fair reliability, X-ray position could fall near a CCD border or gap
2 = poor reliability, X-ray position almost surely falls close to CCD
border or gap)
An additional code of -1 indicates the fact the source falls outside
of the FOV in at least one camera (this does not occur for the present
subsample)
Note on Rank:
The rank gives the quality of the identification with the counterpart,
coded as follows:
0 = optimal (e.g. only counterpart, or brightest and closest)
1 = good
2 = ambiguous (e.g. typically more than one possible counterparts listed)
4 = blank field (unidentified source)
Note on DistXO:
The distance between the X-ray source position and, in the following
order of preference:
- the VVDS optical counterpart (if any)
- or the radio counterpart in the VIMOS1.4GHz catalogue (Bondi et al.,
2003, Cat. J/A+A/403/857)
- or the radio counterpart in the XMM-LSS 325MHz catalogue (Cohen et al.,
2003, Cat. J/ApJ/591/640
- or the catalogued NED object
- or the catalogued SIMBAD object
It is blank if there are no counterparts.
Note on Rmag and Imag:
This note applies to all optical columns from Rmag to e_Imag
inclusive. The magnitudes are given when there is a valid measurement
in the VVDS catalogue. They may be left blank in case of radio
counterparts only, or of (usually very bright) objects present only in
external (SIMBAD) catalogues
Note on Opt:
This flag gives the quality of the VVDS photometry, as follows:
0 = magnitudes flagged as good
1 = magnitudes flagged as possibly bad, but not saturated
2 = magnitudes flagged as bad because saturated
Note on VR:
A "V" in this column indicates an association with a radio source in
the or the radio counterpart in the VIMOS1.4GHz catalogue (Bondi et
al., 2003, Cat. J/A+A/403/857). Otherwise the column is left blank
Note on LR:
A "L" in this column indicates an association with a radio source in
the of the radio counterpart in the XMM-LSS 325 MHz catalogue (Cohen
et al., 2003, Cat. J/ApJ/591/640). Otherwise the column is left blank
Note on CatName:
The name of the counterpart in external sites like NED or SIMBAD
or in the XMM-LSS 325 MHz catalogue (Cohen et al., 2003, Cat.
J/ApJ/591/640) (preferred order).
The VIRMOS 1.4GHZ catalog (Bondi et al., 2003, Cat. J/A+A/403/857)
is in SIMBAD.
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Acknowledgements:
Lucio Chiappetti, lucio(at)iasf-milano.inaf.it
History:
* 06-May-2005: Original version
* 24-Jan-2006: ReadMe revisited (note on XMDS column)
(End) Patricia Vannier [CDS] 06-May-2005