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 (firstname.lastname@example.org)
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|