Max-Planck-Institut für extraterrestrische Physik, Garching
Astronomy and Astrophysics 349, 389-405 (1999).
The catalogue can be used for scientific purposes as long
as the above publication is referenced.
PHA is an acronym for Pulse Height Amplitude.Template:
....+...10....+...20....+...30....+...40....+...50....+...60....+...70....+... ---------------------++---------+---------+---+-----+----+----------+--------- SrcNam R.A. Dec. ?p npedm riv. src-cps ?src-cps ---------------------++---------+---------+---+-----+----+----------+--------- 1RXS J121515.3+874154 183.81375 87.69833 8 _____ __.. 1.247E-01 1.271E-02 80....+...90....+..100....+..110....+..120....+..130....+..140....+..150.. +---------+------+-----+----+-----+----+-----+----+----+-----+-------+---- bgr-cpsa exp hr1 ?hr1 hr2 ?hr2 ext extl srcl extr PriFlgE vigf +---------+------+-----+----+-----+----+-----+----+----+-----+-------+---- 7.921E-04 909 -0.18 0.10 -0.15 0.16 9 1 201 300 111111b 0.72 ..+..160....+..170....+..180....+. +------+------+---++-------------+ orgdat moddat ... field-id src# +------+------+---++-------------+ 960531 000000 0 33001001_0028
Description of the columns:
Columns of the 1rxs format: ---------------------------------------------------------------------------- shortcut | columns | description ---------------------------------------------------------------------------- srcnam | 1- 21 | ROSAT All-Sky Survey Catalogue source name A link to a broad band image is provided if this image is available (see 'i'-flag). R.A. | 24- 32 | Right Ascension, equinox 2000.0 [decimal degrees] Dec. | 34- 42 | Declination, equinox 2000.0 [decimal degrees] ?p | 45- 46 | total positional error (1-sigma-radius; including 6" systematic error) [arcsec] npedm | 48- 52 | screening flags 'T' for 'true', 'F' or '_' for 'false'; '.' for 'not used' n: nearby sources affecting SASS flux determination p: possible problem with position determination e: source extended beyond SASS extraction radius d: complex diffuse emission pattern m: source missed by SASS riv. | 54- 57 | 'new data' flags 'T' for 'true', 'F' or '_' for 'false'; '.' for 'not used' r: source counts and extraction radius recalculated i: broad band image available (html link!) v: variability flag (not yet filled) .: dummy flag src-cps | 60- 68 | source countrate in the broad energy band (PHA range 11 - 235), vignetting corrected [counts/sec]. Conversion factors, assuming a photon spectrum which can be modeled by a power law with an index N and no absorption: 1 count/sec = 10.4E-12 erg/cm^2/s for N = -1 1 count/sec = 5.6E-12 erg/cm^2/s for N = -2 1 count/sec = 3.8E-12 erg/cm^2/s for N = -3 ?src-cps | 70- 78 | error of source countrate, vignetting corrected ?src-cps = 0 means: the error has not been determined. [counts/sec] bgrcpsa | 80- 88 | background countrate, vignetting corrected [counts/sec/arcmin**2] exp | 90- 95 | exposure time [sec] hr1 | 97-101 | hardness ratio 1 Definition: hr1 = ( B - A ) / ( B + A ) , where A = countrate in PHA range 11 - 41 B = countrate in PHA range 52 - 201 ?hr1 | 103-106 | error of hardness ratio 1 Note: true error of hr1 is probably bigger if >9.99: set to 9.99 hr2 | 108-112 | hardness ratio 2 Definition: hr2 = ( D - C ) / ( D + C ) , where C = countrate in PHA range 52 - 90 D = countrate in PHA range 91 - 201 ?hr2 | 114-117 | error of hardness ratio 2 Note: true error of hr1 is probably bigger if >9.99: set to 9.99 ext | 119-123 | source extent The amount is specified, by which the source image exceeds the point spread function. [arcsec] extl | 125-128 | likelihood of source extent if >9999: set to 9999 srcl | 130-133 | likelihood of source detection, defined as -ln(P), where P is the probability that the observed distribution of photons originates from a spurious background fluctuation. if >9999: set to 9999 extr | 135-139 | extraction radius if >9999 (Vela SNR!): set to 9999 [arcsec] PriFlg | 141-146 | priority flags Sliding window detection history using either the background map (M) or the local background (B); 0 = no detection, 1 = detection; order of flags: M-broad, L-broad, M-hard, L-hard, M-soft, L-soft E | 147-147 | PHA range with highest detection likelihood A: 11-41, B: 52-201, C: 52-90, D: 91-201 ' ' or 'b' means 'broad' (11-235) vigf | 149-152 | vignetting factor orgdat | 154-159 | date when source was included format: yymmdd; 000000: removed moddat | 161-166 | date when source properties were changed format: yymmdd; 000000: not changed #id | 168-170 | number of identification candidates in the correlation catalogue field-id | 173-180 | identification number of SASS field An overview of the field structure is available at URL http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/sup/psplit.ps.gz. (mainly for internal use) src# | 182-185 | SASS source number (MASOL number) in SASS field (mainly for internal use) --------------------------------------------------------------------------- Columns of other formats: ---------------------------------------------------------------------------- shortcut | description ---------------------------------------------------------------------------- itb | start time of observation ite | end time of observation ---------------------------------------------------------------------------
?p, src-cps, ?src-cps, bgrcpsa, exp, extl, srcl, extr, priflg, vigf.The values for the hardness ratios and errors
hr1, ?hr1, hr2, ?hr2are not available, if all values are simultaneously at 0.