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IX/28A ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)
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The ROSAT Source Catalog of Pointed Observations with the
High Resolution Imager (1RXH) (3rd Release)
ROSAT Scientific Team
<ROSAT NEWS No. 71, The ROSAT Consortium (*) (2000)>
(*) Max-Planck-Institut fuer extraterrestrische Physik,
Goddard Space Flight Center, Smithsonian Astrophysical Observatory
Leicester University, Astrophysikalisches Institut Potsdam
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ADC_Keywords: X-ray sources ; Surveys
Mission_Name: ROSAT
Description:
The hricat.dat table contains a list of sources detected by the
Standard Analysis Software System (SASS) in reprocessed, public High
Resolution Imager (HRI) datasets. In addition to the parameters
returned by SASS (like position, count rate, signal-to-noise, etc.)
each source in the table has associated with it a set of source and
sequence "flags". These flags are provided by the ROSAT data centers
in the US, Germany and the UK to help the user of the ROSHRI database
judge the reliability of a given source.
These data have been screened by ROSAT data centers in the US,
Germany, and the UK as a step in the production of the Rosat Results
Archive (RRA). The RRA contains extracted source and associated
products with an indication of reliability for the primary parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hricat.dat 368 108514 ROSAT Source Catalog of Pointed Observations
with the High Resolution Imager (1RXH)
hrishort.dat 368 10861 ROSAT Source Catalog of Pointed Observations
restricted to 'firm' detections (1RXH-S)
seq.dat 174 4495 ROSAT observations used for the catalogue
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS)
IX/11 : ROSAT PSPC Source Catalog (1RXP)
IX/12 : The WGACAT version of ROSAT sources (White+ 1995)
http://wave.xray.mpe.mpg.de/rosat/rra/roshri : the ROSHRI Home Page
http://wave.xray.mpe.mpg.de/rosat/doc/ruh : the ROSAT User Handbook
http://heasarc.gsfc.nasa.gov/docs/rosat/rosdocs.html : the ROSAT
User Handbook at HEASARC
http://ledas-www.star.le.ac.uk/rosat/ : the UK ROSAT Public Data Archive
Byte-by-byte Description of file: hricat.dat hrishort.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- SeqDetec *Sequence Detection Name.
20- 21 I2 --- n_1RXH *? Number of sources sharing a common 1RXH name
23- 43 A21 --- 1RXH *Name of catalogued detection
45- 47 I3 arcsec ErrPos Total positional error
49- 58 E10.3 ct/s CRate Estimate of net count rate
60- 67 E8.2 ct/s e_CRate ?=0 Mean error on CRate
69- 73 F5.1 --- SNR Signal-to-noise ratio (truncated at 999.9)
75- 76 I2 arcmin offAxis Off axis angle averaged over observation
78- 83 I6 s ExpTime Exposure live time
85 A1 --- varFlag *[NTP] Source variability
88-100 A13 --- SRCflags *[.cdefiu_mnpavw] Source flags
102-109 A8 --- SEQflags *[.DABEFMS_+] Sequence flags
111-116 A6 "YYMMDD" ChkDate Date of sequence and source checking
118-121 A4 --- ChkSite Checker Site (MPE, AIP, GSFC or SAO)
123-126 A4 --- ChkName Checker ID
128-132 A5 --- Comment Source comment
136-141 A6 "YYMMDD" begDate Observation start date
143-148 A6 "YYMMDD" endDate Observation finish date
150-165 A16 ---- ObsID Observation Identification
167-170 A4 --- Site Processing site (MPE or USRS)
174-181 F8.4 deg RAdeg Source Right Ascension (J2000)
183-190 F8.4 deg DEdeg Source Declination (J2000)
192-199 F8.4 deg Glon Galactic Longitude
201-208 F8.4 deg Glat Galactic Latitude
210-212 F3.1 --- EPI *[0,0.5] Edge Proximity Indicator
214-219 F6.1 pix Xpos Unblocked x source position (0.5arcsec/pixel)
221-226 F6.1 pix Ypos Unblocked y source position (0.5arcsec/pixel)
228-233 F6.2 pix imXpox Blocked x source position (8arcsec/pixel)
235-240 F6.2 pix imYpox Blocked y source position (8arcsec/pixel)
242-247 F6.1 pix lev1_X SASS level 1 x coordinate (0.5arcsec/pixel)
249-254 F6.1 pix lev1_Y SASS level 1 y coordinate (0.5arcsec/pixel)
256-260 F5.1 arcsec cirRadius Radius of source circle for source
intensity measurement
261-267 I7 ct totCounts Total (source + background) counts
within cirRadius
269-272 I4 ct e_totCounts Mean error on totCounts
274-277 I4 ct bkgCounts Background counts inside cirRadius
279-283 F5.3 --- QE 1keV Quantum Efficiency
which has been used to derive CRate
285-289 F5.3 --- vig 1keV vignetting correction for source
which has been used to derive CRate
291-295 F5.3 --- csc 1keV scattering correction for source
which has been used to derive CRate
297-299 I3 arcsec Xsize X source detect cell size
301-303 I3 arcsec Ysize Y source detect cell size
305-311 I7 ct boxCounts Total counts in detection box
313-316 I4 ct thrCounts Threshold for detection at this location
318-321 F4.2 --- unresPr *[0,1] Probability the source is unresolved
323-328 F6.1 pix XposEC X position of extended circle (0.5arcsec/pix)
330-335 F6.1 pix YposEC Y position of extended circle (0.5arcsec/pix)
337-342 F6.1 arcsec RadEC Radius of the extended circle
345-350 F6.3 --- SctEC Extended circle scattering correction
(truncated at 999.999)
352-359 F8.2 --- CorEC Extended circle size correction
(truncated at 99999.99)
361-368 F8.2 --- e_CorEC Mean error on CorEC
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Note on SeqDetec:
Unique name for detection, based on the observation sequence id and
the number of the detection in the source list for that sequence.
Note on 1RXH, n_1RXH:
this name follows IAU conventions (based on J2000 position). Note that
this name is NOT UNIQUE, detections with the same position sharing the
same detection name; such detections may or may not represent the same
astrophysical source. The column n_1RXH, if not blank, gives the
number of sources sharing the same 1RXH name (the n_1RXH column was
added at CDS)
Note on varFlag: Source variability flag from SASS:
N = Negative
T = Too few observations
P = Possible
Note on SRCflags:
The dot (.) indicates the absence of the flag.
c = CONFUSED (Close sources confused detection algorithm)
d = DET_STRUCT (Source near detector structure)
e = EXTENDED (Source extended, probably resolved)
f = FALSE_DET (Detection of unreal or false source)
i = INTEN_SUSP (Source brightness suspect)
u = UN_UNIQUE (source matched with another source which was
identified in a smaller detect cell)
m = MULT_DET (Complex emission split into individual sources)
n = NOT_CHECKED (Weak source below SNR threshold used for checking)
p = POS_SUSP (Source position suspect)
a = ASSOCIATED (another source nearby may influence
derived source quantities)
v = VARFLG_SUSP (Source variability indicator from SASS is suspect)
w = WITHIN_EXT (Source within extended emission)
Note on SEQflags:
The dot (.) indicates the absence of the flag.
D = DEFERRED (Field not flagged by operator)
data screening not done
A = ASP_SUSP (Aspect solution suspect)
obvious aspect problems, sources appear multiple or have
obvious ellipticity
B = BKG_SUSP (Background suspect)
Field background may be incorrect, due to inclusion of
high background intervals or extended emission
E = EXT_EMIS (Extended emission in field)
presence of extended emission over most of the field
F = FIELD_FDET (False detections in field)
one or more detected sources deemed false
M = SRC_MISS (Sources in field missed)
S = SLIS_MIS (Source list missing)
source list is missing, no sources detected by SASS or
source detection stopped
+ = source is included in the Short Version, i.e. has the
following flags not set (marked with a dot):
SRCflags: f (FALSE_DET) n (NOT_CHECKED) u (UN_UNIQUE)
SEQflags: D (DEFERRED)
(the "+" flag was added at CDS)
Note on EPI:
The Edge Proximity Indicator indicates what fraction of the detect
cell is corrupted by edges or hot spots; a zero means no edges or hot
spots and 1.0 means complete obscuration.
Note on unresPr:
this number measures how well the radial distribution matches the
expected probability function. A perfect match produces unresPr=1.0
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Byte-by-byte Description of file: seq.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- DataFile ROSAT Data File
26- 29 A4 --- ChkSite Checker Site (AIP, GSFC, MPE or SAO)
31- 34 A4 --- ChkName Checker ID
36- 41 A6 "YYMMDD" ChkDate Date of sequence and source checking
43- 50 A8 --- ChkVers Checking version
52- 59 A8 --- SEQflags [.DABEFMS_] Sequence flags (see the
"Note on SEQflags" section above)
61- 67 I7 s ExpTime Exposure live time
70- 75 A6 "YYMMDD" begDate Observation start date
77- 82 A6 "YYMMDD" endDate Observation finish date
84- 87 I4 --- Nsrc Number of sources
89- 91 I3 --- --- [0]
93-103 A11 --- error Reason for skipping the qsrc file
105-106 I2 --- unRRA [0] Number of RRA (ROSAT Result Archive) table
columns which contain undefined values
for any of the sources
108 I1 --- unkey1 [0] Number of undefined keywords from
primary header
110-111 I2 --- unkey2 Number of undefined keywords from
secondary header
113-115 I3 --- statSRCc Number of sources with flag 'c' (CONFUSED)
116-118 I3 --- statSRCd Number of sources with flag 'd' (DET_STRUCT)
119-121 I3 --- statSRCe Number of sources with flag 'e' (EXTENDED)
122-124 I3 --- statSRCf Number of sources with flag 'f' (FALSE_DET)
125-127 I3 --- statSRCi Number of sources with flag 'i' (INTEN_SUSP)
128-130 I3 --- statSRCu Number of sources with flag 'u' (UN_UNIQUE)
131-133 I3 --- --- [0]
134-136 I3 --- statSRCm Number of sources with flag 'm' (MULT_DET)
137-139 I3 --- statSRCn Number of sources with flag 'n' (NOT_CHECKED)
140-142 I3 --- statSRCp Number of sources with flag 'p' (POS_SUSP)
143-145 I3 --- statSRCa Number of sources with flag 'a' (ASSOCIATED)
146-148 I3 --- statSRCv Number of sources with flag 'v' (VARFLG_SUSP)
149-151 I3 --- statSRCw Number of sources with flag 'w' (WITHIN_EXT)
153-160 F8.4 deg RAdeg Pointing Right ascension (J2000)
162-169 F8.4 deg DEdeg Pointing Declination (J2000)
171-174 A4 --- Site Processing Site (MPE or USRS)
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History:
* 05-Nov-1999:
The files corresponding to the 2nd Release were copied from
ftp.xray.mpe.mpg.de on 22-Aug-1999.
This ReadMe file is essentially made from the ROSAT documentation
available at the ROSHRI Home Page
(http://wave.xray.mpe.mpg.de/rosat/rra/roshri).
The columns 'n_1RXH' (indication of sources with name collisions) and
the SEQflag "+" (indicating a source belonging to the short sample)
were added at CDS.
* 05-May-2000:
The files corresponding to the 3rd Release were copied from
ftp.xray.mpe.mpg.de, after revision.
The same procedure as made on 05-Nov-1999 was applied to the new files.
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(End) Francois Ochsenbein [CDS] 03-May-2000