J/A+A/371/833 ROSAT Ultra Deep Survey (Lehmann+, 2001)
The ROSAT Deep Survey:
VI. X-ray sources and Optical identifications of the Ultra Deep Survey.
Lehmann I., Hasinger G., Schmidt M., Giacconi R., Truemper J.,
Zamorani G., Gunn J.E., Pozzetti L., Schneider D.P., Stanke T.,
Szokoly G., Thompson D., Wilson G.
<Astron. Astrophys. 371, 833 (2001)>
=2001A&A...371..833L 2001A&A...371..833L
ADC_Keywords: X-ray sources ; Surveys ; QSOs
Mission_Name: ROSAT
Keywords: surveys - galaxies: active - galaxies: clusters: general -
quasars: emission lines - galaxies: Seyferts - X-ray: galaxies
Description:
The ROSAT Ultra Deep Survey in the Lockman Hole consists of a sample
of 94 X-ray sources reaching a limiting flux of 1.2x10-15erg/s/cm2
in the 0.5-2.0keV energy band. About 90% of the X-ray sources have
been spectroscopically identified using low-resolution Keck spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 100 94 X-ray source catalogue
table4.dat 90 94 Photometric and spectroscopic properties of
optical counterparts
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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- 19 A19 --- RXJ Source name
21- 24 I4 --- Seq Internal source number
25- 28 A4 --- n_Seq [(H P12)] Sample (1)
30- 31 I2 h RAh Right ascension (J2000)
33- 34 I2 min RAm Right ascension (J2000)
36- 39 F4.1 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 51 F4.1 arcsec DEs Declination (J2000)
53- 56 F4.1 arcsec e_Pos 1-Sigma error of the source position
57 A1 --- n_Pos [HPR] Source position origin (2)
59- 62 F4.1 arcmin offHRI Distance of the source from the center
of the HRI field
64- 67 F4.1 arcmin offPSPC Distance of the source from the center
of the PSPC field
69- 73 F5.2 10-17W/m2 FHRI ? HRI flux in the 0.5-2.0keV band
75- 78 F4.2 10-17W/m2 e_FHRI ? HRI flux error
80- 84 F5.2 10-17W/m2 FPSPC ? PSPC flux in the 0.5-2.0keV band
86- 89 F4.2 10-17W/m2 e_FPSPC ? PSPC flux error
91- 95 F5.2 --- HR1 ? HR1 hardness ratio (3)
97-100 F4.2 --- e_HR1 ? Error of HR1
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Note (1):
H: HRI sample
P1: PSPC sample 1
P2: PSPC sample 2
Note (2):
P: Source position based on the 207 ks PSPC exposure
H: Source position based on the 1112 ks HRI pointing
R: Source position based on the 205 ks HRI raster scan
Note (3):
HR1: Hardness ratio HR1=(H-S)/(H+S) derived from the
PSPC energy bands (S: 0.1-0.4keV, H: 0.5-2.0keV)
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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 --- Name Name of optical counterpart
11- 14 F4.1 mag Rmag R magnitude
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000)
39- 40 I2 arcsec DeltaPos Distance to the X-ray source position
41 A1 --- n_DeltaPos [HPR] Source position origin (1)
43- 47 F5.2 10-17W/m2 SX HRI or PSPC flux in the 0.5-2.0keV energy
band
49- 53 F5.2 --- log(FX/Fo) Logarithm of the X-ray to optical flux ratio
55 A1 --- G [sg] Optical morphological parameter (2)
57- 61 F5.3 --- z ? Redshift (3)
63- 67 F5.1 mag VMAG ? Absolute V magnitude
69- 73 F5.2 [10-7W] logLX ? Logarithm of the 0.5-2.0keV X-ray
luminosity
75- 77 F3.1 mag R-K' ? R-K' colour index
79- 83 A5 --- Class Optical classification (4)
85- 90 A6 --- IDclass Classification scheme (5)
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Note (1):
P: Source position based on the 207 ks PSPC exposure
H: Source position based on the 1112 ks HRI pointing
R: Source position based on the 205 ks HRI raster scan
Note (2):
s: Star-like
g: Extended, galaxy-like
Note (3):
Photometric redshifts are given for objects 14Z, 84Z and 486A
Note (4):
AGNI: Broad emission line AGN
AGNII: Narrow emission line AGN
GAL: Galaxy
CLUS: Cluster of galaxies
GRP: Group of galaxies
STAR: Star
Note (5): Identification classes:
The existence of broad UV/optical emission lines with FWHM>1500km/s
in the optical spectra of 27 X-ray sources of the 46 new UDS sources
reveals broad emission line AGNs (type I), which are subclassified in
the ID classes a-c.
The 15 new objects of ID class a show at least two of the high-
redshifted broad emission lines: Mg II λ2798, CIII]
λ1908, C IV λ1548, Si IV λ1397, Lyα
λ1216.
Ten new objects belong to the ID class b. Their optical spectra show
only a broad Mg II emission line and usually several narrow
There is no ID class c object (showing only broad Balmer emission
lines) among the 46 new sources.
Four X-ray sources are identified with narrow emission line AGNs (type
II). One of these AGNs (901A) is identified with ID class d, where
high ionization [Ne V] λ3426 emission lines indicate an AGN.
Three narrow line AGNs belong to the ID class e, which contains 13 new
UDS sources. The optical spectra of these sources show neither broad
emission lines nor high ionization [Ne V] emission lines.
The identification of the ID class e objects is based on the ratio of
X-ray to optical flux FX/FV as defined by Stocke et al. (1991, Cat.
J/ApJS/76/813), the angular extent of the X-ray source and its high
0.5-2.0keV X-ray luminosity (LX≥10+43erg/s) indicating an AGN or a
group/cluster of galaxies.
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History: 28-Jan-2003: RX J105213.3+57522 modified in RX J105213.3+573222,
in accordance with the printed version of the table and the
optical counterpart.
Acknowledgements: Ingo Lehmann
References:
Hasinger et al., Paper I 1998A&A...329..482H 1998A&A...329..482H
Schmidt et al., Paper II 1998A&A...329..495S 1998A&A...329..495S
Lehmann et al., Paper III 2000A&A...354...35L 2000A&A...354...35L
Hasinger et al., Paper IV 1998A&A...340L..27H 1998A&A...340L..27H
Zamorani et al., Paper V 1999A&A...346..731Z 1999A&A...346..731Z
(End) Ingo Lehmann [AIP], Patricia Bauer [CDS] 31-May-2001