Finding X-ray counterparts for unidentified sources in the 105 months BAT survey - 1
ATel #11340; Stephen. J.B., Bassani L., Malizia A., Masetti N. (INAF-OAS Bologna), P. Ubertini (INAF-IAPS Roma)
on 23 Feb 2018; 15:04 UT
Credential Certification: Angela Malizia (malizia@iasfbo.inaf.it)
Subjects: X-ray, Gamma Ray, AGN
Referred to by ATel #: 11341
We provide X-ray counterparts for the unidentified Swift/BAT sources listed in the 105 month catalogue (Oh et al. 2018, ApJS in press).
These associations were found by cross-correlating the list of U1,U2 and U3 sources with the ROSAT Bright (RASSBSC, Voges et al. 1999, A&A, 349, 389) and the XMM-Newton Slew (XMMSlew, Saxton et al. 2008, A&A, 480, 611) catalogues. Using the method developed by Stephen et al. (2005, A&A, 432, L49), we find a strong correlation
with 26 (RASSBSC, R in table) and 11 associations (XMMSlew, X) respectively with around one of these expected by chance alignment. Considering only U1 and U2 sources, we find 9 associations which are listed below
where for each BAT source we report position and relative error of the X-ray counterpart, its distance from the BAT source position compared to the BAT 90% error radius, the catalogue used and information (redshift and class) on the optical counterpart. Optical identifications were found using the RASSBSC positional and the XMMSlew astrometric uncertainties.
In 3 cases the X-ray counterpart is outside the 90% BAT error circle but inside the 99% positional uncertainty. We also retrieved and analysed the 6dFGS spectrum of 6dFGS J210322.1-214756 and 6dFGS J134043.6-281105 as well as the LAMOST spectrum of SWIFTJ0156.1+4463 but only in the last two cases were we able to classify the objects.
SWIFTJ0628.7-8346 is likely an AGN because its WISE colours are typical of this class.
| Swift Name | RA (J2000) | Dec (J2000) | Err | dist/BAT err | CAT | Counterpart | z/class |
|---|
| J0156.1+4463 | 01 56 22.00 | +44 42 30.5 | 10" | 5.3'/5.7' | R/U1 | 2MASX J01562185+4442327 | 0.017/XBONG |
| J1107.8+7107 | 11 07 48.80 | +71 05 38.5 | 10" | 1.5'/5.7' | R/U1 | 2MASX J11074777+7105326 | 0.060/AGN |
| J1118.0+4794 | 11 19 15.90 | +47 51 11.5 | 10" | 6.0'/5.3' | R/U1 | 2MASX J11074777+7105326 | 0.060/Sey1 |
| J1340.9-2808 | 13 40 44.00 | -28 11 09.0 | 21" | 4.9'/5.2' | R/U1 | 6dFGS J134043.6-281105 | 0.215/AGN |
| J1503.7+6850 | 15 04 13.10 | +68 56 10.5 | 7" | 6.3'/5.7' | R/U1 | 2MASS J15041280+6856129 | 0.318/Sey1 |
| J1641.4-2010 | 16 41 22.30 | -20 00 33.0 | 10" | 5.9'/4.9' | R/U1 | 2MASS J16412251-2000337 | 0.058/AGN |
| J2103.3-2144 | 21 03 22.21 | -21 47 43.0 | 10" | 4.0'/5.5' | R/U1 | 6dFGS J210322.1-214756 | 0.289/Sey2 |
| J0628.7-8346 | 06 29 53.66 | -83 44 20.7 | 8" | 2.3'/5.5' | X/U2 | 2MASS J06294867-8344217 | -/AGN cand |
| J1809.6-4585 | 18 09 57.98 | -45 52 44.3 | 8" | 3.5'/5.6' | X/U1 | ICRF J180957.8-4552410 | 0.070/BL Lac |
