ROSPSPCTOTAL - ROSAT Complete Results Archive Sources for the PSPC
The ROSPSPCTOTAL database table contains a list of sources detected by the Standard
Analysis Software System (SASS) in public, unfiltered, pointed PSPC datasets.
In addition to the parameters returned by SASS (like position, count rate,
likelihood, 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 ROSPSPCTOTAL
database table quickly judge the reliability of a given source.
The ROSPSPCTOTAL database table is a superset of the ROSPSPC database table.
The ROSPSPC table excludes sources that meet the following parameter criteria:
false_det = 'T' or deferred = 'T' or not_checked = 'T'. See the documentation
below for descriptions of these parameters.
The catalog consists of all primary source parameters from the automated
detection algorithm employed by the SASS. In addition each observation has
been quality checked, both by automatic algorithms and by detailed visual
inspection. The results of this quality checking are contained as a set of
logical-value flags for a set of principal source parameters. If a source
parameter is suspect, the associated flag is set to "TRUE"; parameters with
no obvious problems maintain the default, "FALSE", value.
More information about the ROSAT mission and the SASS can be obtained from
the ROSAT USER HANDBOOK, available from the WWW at
This database table was last updated in August 2001. More information about
the ROSAT Results Archive for PSPC sources can be obtained at the following
This catalog is the SECOND ROSAT SOURCE CATALOG OF POINTED OBSERVATIONS WITH
THE POSITION SENSITIVE PROPORTIONAL COUNTER (ROSPSPC / 2RXP), released on
August 9, 2001. (See ROSAT NEWS No. 74 at
http://heasarc.gsfc.nasa.gov/mail_archive/rosnews/msg00131.html for the
The following flags are used by the datacenters in constructing the ROSPSPC
table. Flags are divided into "SEQUENCE FLAGS" which describe an entire data
sequence, and "SOURCE FLAGS" which describe an individual detection. The PSPC
source flags are associated with the primary SASS parameters like count
rates, positions, etc., and with qualitative source characteristics.
All flags are LOGICAL, i.e. they have a value of TRUE or FALSE. A flag with a
TRUE value indicates a possible problem with a source parameter. Thus, a
source with no discernable problem would have all flags set to FALSE.
FLAG NAME "True" condition
ASP_SUSP obvious aspect problems (sources appear multiple or
have obvious ellipticity) (*)
EXT_EMIS presence of extended emission over most of the field
FIELD_FDET one or more detected sources deemed false
DEFERRED data screening not done
MISS_SRC one or more obvious sources not detected by SASS
BKG_SUSP field background may be incorrect (due to inclusion
of high background intervals or extended emission)
SLIS_MIS source list is missing (no sources detected by SASS or
source detection stopped)
EXPO_MAP the exposure map is not correct
FLAG NAME "True" condition
CONFUSED close sources confused detection algorithm
DET_STRUCT source near detector structure
EXTENDED source is probably resolved
FALSE_DET detection judged to be spurious
INTEN_SUSP source intensity suspect
LTC_SUSP source lightcurve may be suspect
SPEC_SUSP source spectrum suspect
MULT_DET complex emission split into individual sources
NOT_CHECKED source not checked visually by operator
POS_SUSP source position suspect (*)
ASSOCIATED another source nearby may influence derived source
VARFLG_SUSP SASS variability flag suspect
WITHIN_EXT source within extended emission
(*) Note: The ASP_SUSP and POS_SUSP flags have been set for all observations
after the loss of the second startracker on 1998-Apr-25.
The Second ROSAT Pointed PSPC Source Catalog includes missing sources, i.e.
obvious sources which were not detected by the SASS source detection software
but which could be easily detected by visual inspection. Missed sources in
the list are marked by negative values of their source identification
numbers, i.e. the parameters 'SOLST_ID' and 'MPLSX_ID' are negative for these
sources. The only tabulated quantities for these visually identified missed
sources are source positions; other quantities (like count rates, hardness
ratios, etc.) are not available.
Source right ascension
Source Galactic Longitude
Source Galactic Latitude
Unblocked x source position (0.5 arcsec/pixel)
Unblocked y source position (0.5 arcsec/pixel)
Error in position (0.5 arcsec/pixel)
Blocked x source position (15 arcsec/pixel)
Blocked y source position (15 arcsec/pixel)
Source X error in image pixels
Source Y error in image pixels
SASS level 1 x coordinate
SASS level 1 y coordinate
Off axis angle averaged over observation (arcmin)
Source count rate from ML or MDETEC (cts/s), pha channel 11 to 235
Error of count rate (cts/s), pha channel 11 to 235
Bkg surface countrate (cts/s/arcmin**2)
Source detect cell size (arcsec)
Exposure live time (s)
Maximum likelihood from ML algorithm
Distance from source to nearest source (arcsec)
Distance from source to nearest rib (arcsec)
sigma of gaussian distribution fitted to data (arcsec)
Source likelihood of extent
Hardness ratio (B-A)/(B+A), where A = counts in PHA-channel
11-41 and B = counts in PHA-channel 52-201
Error in hardness ratio 1
Hardness ratio (D-C)/(D+C), where C = counts in PHA-channel
52-90 and D = counts in PHA-channel 91-201
Error in hardness ratio 2
Reduced chi-square of power law fit
Reduced chi-square of Raymond-Smith fit
Mean vignetting correction
Source net counts for PHA-channel 11-41
Source net counts for PHA-channel 52-201
Source net counts for PHA-channel 52-90
Source net counts for PHA-channel 91-201
Error on source net counts for PHA-channel 11-41
Error on source net counts for PHA-channel 52-201
Error on source net counts for PHA-channel 52-90
Error on source net counts for PHA-channel 91-201
corrected src-rib dist
corrected src-src dist
Source likelihood from the L/MDETECT algorithm
Extraction radius in MAX LIKELIHOOD algorithm (?arcsec)
Observation start date
Observation finish date
ROSAT Observation Request number assigned to the observing program.
Typically the target of each pointed observation will have a unique ROR
number assigned to it.
Source number from the merged source list (MPLSX)
Source number from the final source list (SOLST)
Date on which this particular observation was visually inspected (yymmdd)
Rationalized Data Format root file name; changed 980403 from FNAME. An
observing sequence consists of a number of files with names like
SEQID_suffix.fits. For example, rp900176n00_bas.fits is the name of the
"basic" events file for the pointing named by SEQID="rp900176n00".
Observation ID used during SASS processing
Processing Site (either MPE or GSFC)
Filter (either NONE or BORON); for the ROSPSPC table, FILTER="NONE"
since all the filtered observations are listed in a separate table (ROSPSPCF)
Bit-encoded value which signifies in which band(s) the detection was made.
A bit value = 1 means a detection, 0 means no detection. The bits are
encoded as follows:
00 LDETEC, broad band
01 LDETEC, soft band
02 LDETEC, hard band
03 MDETEC, broad band
04 MDETEC, soft band
05 MDETEC, hard band
Flag set to Y if the counts(net_rt) from the MDETEC (maximum likelihood
detection) algorithm rather than the LDETEC (Local detect) algorithm.
Variability flag from chi-square test
Variability flag from KS test
Variability flag from U test
Variability flag from FFT test
Summary of source flags. This is a string of abbreviations for each source
flag which is set to TRUE, and indicates a possible problem with the source.
The abbreviations used are c=CONFUSED, d=DET_STRUCT, e=EXTENDED f=FALSE_DET,
i=INTEN_SUSP,l=LTC_SUSP, s=SPEC_SUSP, m=MULT_DET, n=NOT_CHECKED,
p=POS_SUSP,a=ASSOCIATED, v=VARFLG_SUSP, w=WITHIN_EXT.
Close sources confused detect
Source near detector structure
Source brightness suspect
Source spectrum suspect
Source lightcurve suspect
Complex emission erroneously split into numerous point sources
Source not checked
Source position suspect
Associated source nearby
Source variability flag suspect
Source within extended emission
Summary of sequence flags. This is a string of abbreviations for each
sequence flag which is set to TRUE, and indicates a possible problem with the
sequence. The abbreviations used are A=ASP_SUSP, E=EXT_EMIS, F=FIELD_FDET,
D=DEFERRED, M=MISS_SRC, B=BKG_SUSP, S=SLIS_MIS, X=EXPO_MAP.
Possible aspect problems?
Possible bkg problems?
Significant extended emission
False detections present
Missed sources present
No source list available
Variability flag (see comments below)
Name of source, like: 2RXP J153127.5+312918)
Name of detection, like: 1RXP J153127.5+312918)
Name of detection, like: 1rp200855n00.123
Questions regarding the ROSPSPCTOTAL database table can be addressed to the
HEASARC User Hotline.
If you have any problems, please consult the help
page or mail firstname.lastname@example.org