J/ApJS/184/138 XID II: RASS/BSC-2MASS/PSC cross-association (Haakonsen+, 2009)
XID II: statistical cross-association of ROSAT Bright Source Catalog X-ray sources with 2MASS point source catalog near-infrared sources. Haakonsen C.B., Rutledge R.E. <Astrophys. J. Suppl. Ser., 184, 138-151 (2009)> =2009ApJS..184..138H
ADC_Keywords: Cross identifications ; Infrared sources ; X-ray sources Keywords: catalogs - infrared: general - stars: coronae - X-rays: galaxies X-rays: general - X-rays: stars Abstract: The 18806 ROSAT All Sky Survey Bright Source Catalog (RASS/BSC) X-ray sources are quantitatively cross-associated with near-infrared (NIR) sources from the Two Micron All Sky Survey Point Source Catalog (2MASS/PSC). An association catalog is presented, listing the most likely counterpart for each RASS/BSC source, the probability Pid that the NIR source and X-ray source are uniquely associated, and the probability Pno-id that none of the 2MASS/PSC sources are associated with the X-ray source. The catalog includes 3853 high quality (Pid>0.98) X-ray-NIR matches, 2280 medium quality (0.98≥Pid>0.9) matches, and 4153 low quality (0.9≥Pid>0.5) matches. Of the high quality matches, 1418 are associations that are not listed in the SIMBAD database, and for which no high quality match with a USNO-A2 optical source was presented for the RASS/BSC source in previous work. The present work offers a significant number of new associations with RASS/BSC objects that will require optical/NIR spectroscopy for classification. For example, of the 6133 Pid>0.9 2MASS/PSC counterparts presented in the association catalog, 2411 have no classification listed in the SIMBAD database. These 2MASS/PSC sources will likely include scientifically useful examples of known source classes of X-ray emitters (white dwarfs, coronally active stars, active galactic nuclei), but may also contain previously unknown source classes. It is determined that all coronally active stars in the RASS/BSC should have a counterpart in the 2MASS/PSC, and that the unique association of these RASS/BSC sources with their NIR counterparts thus is confusion limited. Description: Observations of the RASS/BSC (Voges et al., 1999, cat. IX/10) were made in 1990/91 with the ROSAT/PSPC satellite. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 162 18806 Association catalog
See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [1RXS] 6- 21 A16 --- 1RXS RASS/BSC source name (JHHMMSS.s+DDMMSS) 23- 65 A43 --- obj SIMBAD object type of RASS/BSC source 67- 72 F6.2 ct/s xrt RASS/BSC source count rate 74- 77 F4.2 ct/s e_xrt RASS/BSC source count rate uncertainty 79- 83 F5.3 --- P(noid) Probability of no association (1) 85- 89 A5 --- --- [2MASS] 91-107 A17 --- 2MASS ? 2MASS/PSC source name (JHHMMSSss+DDMMSSs) 109-151 A43 --- obj2 ? SIMBAD object type of 2MASS/PSC source 153-156 F4.1 mag Jmag ? 2MASS/PSC source J-band magnitude 158-162 F5.3 --- P(id) ? Probability of unique association (1)
Note (1): P(noid)=1/(1+ΣMj=1(Rj/1-Rj_)). [See equation (4) in section 2 of the paper for further details] Pi(id)=Ri/[(1-Ri)(1+ΣMj=1(Rj/1-Rj_)]. [See equation (3) in section 2 of the paper for further details]. The definitions of P(id) and P(noid) are the same as in the previous work (Rutledge et al., 2000ApJS..131..335R).
History: From electronic version of the journal References: Rutledge et al. Paper I. 2000ApJS..131..335R.
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Feb-2010
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