SWBAT105M - Swift-BAT 105-Month All-Sky Hard X-Ray Survey

Overview

The catalog includes hard X-ray sources detected in the first 105-months of observations with the Burst Alert Telescope (BAT) coded-mask imager on board the Swift observatory. The 105-month Swift-BAT survey is a uniform hard X-ray all-sky survey with a sensitivity of 8.40x10^-12erg/s/cm² over 90% of the sky and 7.24x10^-12erg/s/cm² over 50% of the sky in the 14-195 keV band. The Swift-BAT 105-month catalog provides 1632 (422 new detections) hard X-ray sources in the 14-195 keV band above the 4.8 sigma significance level. Adding to the previously known hard X-ray sources, 34% (144/422) of the new detections are identified as Seyfert active galactic nuclei (AGNs) in nearby galaxies (z<0.2). The majority of the remaining identified sources are X-ray binaries (7%, 31) and blazars/BL Lac objects (10%, 43). As part of this new edition of the Swift-BAT catalog, the authors release eight-channel spectra and monthly sampled light curves for each object in the online journal and at the Swift-BAT 105-month website.

The data reduction, analysis, and catalog generation of the Swift-BAT 105-month survey (between 2004 December and 2013 August) are conducted following the same procedures as in the Swift-BAT 70-month survey (Baumgartner+ 2013, J/ApJS/207/19). The catalog includes 1632 hard X-ray sources detected across the entire sky. Of these 1632 sources, 422 are new detections with respect to the 70-month catalog, and 320 are reported as hard X-ray sources for the first time. The Swift-BAT 105-month survey catalog contains 947 non-beamed AGNs detected in the hard X-ray band.

The authors inspected soft X-ray images provided by Swift-XRT (3-10keV), Chandra (2-10keV), ASCA (2-10keV), and XMM-Newton (4-10keV) for the newly detected sources when available using 15 arcmin of matching radius. See section 2.1 of the paper for further explanations.

Catalog Bibcode

2018ApJS..235....4O

References

The 105-month Swift-BAT all-sky hard X-ray survey.
    Oh K., Koss M., Markwardt C.B., Schawinski K., Baumgartner W.H.,
    Barthelmy S.D., Cenko S.B., Gehrels N., Mushotzky R., Petulante A.,
    Ricci C., Lien A., Trakhtenbrot B.
   <Astrophys. J. Suppl. Ser., 235, 4 (2018)>
   =2018ApJS..235....4O

Provenance

This table was created by the HEASARC in March 2020 based upon the CDS Catalog J/ApJS/235/4 file table3.dat.

Parameters

Source_Number
The Swift-Bat Survey identification number, which is unique for each source in the catalog. The provided index is the same as that of the 70-month catalog. For the new detections, the index is assigned in the order of increasing right ascension.

Name
The Swift-BAT source designation (SWIFT JHHMM.m+DDMMA or SWIFT JHHMMSS.s+DDMMSS). For the sources that have been previously published (i.e., the 70-month Swift-BAT catalog), the corresponding BAT name is used.

RA
The Right Ascension of the Swift-BAT source, given in J2000.0 decimal degrees to a precision of 10^-8 degrees in the originating table. epoch.

Dec
The Declination of the Swift-BAT source, given in J2000.0 decimal degrees to a precision of 10^-8 degrees in the originating table.

LII
The Galactic longitude of the Swift-BAT source. This parameter has been added by the HEASARC and is derived from the J2000.0 source position.

BII
The Galactic latitude of the Swift-BAT source.This parameter has been added by the HEASARC and is derived from the J2000.0 source position.

SNR
The signal-to-noise ratio, which is the ratio between the highest pixel value of the source from the total-band mosaic flux map and the local noise. The authors choose a significance level, snr=4.8, as the detection threshold.

Ctrpart_Name
The counterpart source designation, based on well-known optical source or X-ray archival data (e.g., Swift-XRT, Chandra, and XMM-Newton).

Ctrpart_RA
The right ascension for the counterpart source, given in degrees for the J2000.0 epoch. This coordinate is taken from NED or SIMBAD. If no counterpart if known, the BAT position is listed. In the case of source_type of U2 ("Unknown class II") whose soft X-ray coordinate is well-defined with SNR threshold >3, the Swift-XRT soft X-ray (3-10 keV) detection coordinate is provided.

Ctrpart_Dec
The declination for the counterpart source, given in degrees for the J2000.0 epoch. This coordinate is taken from NED or SIMBAD. If no counterpart if known, the BAT position is listed. In the case of source_type of U2 ("Unknown class II") whose soft X-ray coordinate is well-defined with SNR threshold >3, the Swift-XRT soft X-ray (3-10 keV) detection coordinate is provided.

Flux
The Swift-BAT 14-195keV flux, in erg/s/cm². The flux is extracted from the Swift-BAT maps at the position listed for the counterpart. The fluxes are measured from the eight BAT bands (14-20 keV, 20-24 keV, 24-35 keV, 35-50 keV, 50-75 keV, 75-100 keV, 100-150 keV, and 150-195 keV) of the mosaicked maps. For the BAT source whose counterparts are not known, the flux was measured from the detected BAT source positions using the same eight BAT bands.

Flux_Lower
The lower 90%-confidence interval in flux, in units of erg/s/cm².

Flux_Upper
The upper 90%-confidence interval in flux, in units of erg/s/cm².

Spectral_Index
The spectral photon index, gamma, computed from a power-law fit, using the XSPEC pegpwrlaw model, power-law with pegged normalization) to the eight-band BAT data.

Spectral_Index_Lower
The lower 90%-confidence interval in the spectral_index, gamma, which is computed from a power-law fit, using the XSPEC pegpwrlaw model, power-law with pegged normalization) to the eight-band BAT data. The 90%-confidence interval was calculated based on the error function, within XSPEC. The HEASARC changed values of "0.00" for this parameter to nulls.

Spectral_Index_Upper
The upper 90%-confidence interval in the spectral_index, gamma, which is computed from a power-law fit, using the XSPEC pegpwrlaw model, power-law with pegged normalization) to the eight-band BAT data. The 90%-confidence interval was calculated based on the error function, within XSPEC. The HEASARC changed values of "0.00" for this parameter to nulls.

Chi_Squared
The reduced chi squared of the spectral fit.

Redshift
The redshift of the source, taken from the online databases NED and SIMBAD or in a few cases, from the authors' analysis of the optical data.

Log_Lx
The logarithm of Swift-BAT X-ray 14-195keV luminosity, in erg/s, for sources classified as AGNs. The luminosities are computed using the flux and redshift, given in this catalog, and assume the following cosmology: H₀=70 km/s/Mpc, Omega_m=0.30, and Omega_Lambda=0.70.

Ctrpart_Class
The classification of the counterpart given by the following codes:

     10 = Unknown class indicates that the authors do not know source type of the
           optical counterpart (35 occurrences). Unknown class I ("U1") is used
           when there is no soft X-ray (3-10keV) detection despite its
           archival soft X-ray observation;
     11 = Unknown class II ("U2") indicates sources for which there is a soft
           X-ray detection with SNR threshold greater than 3 from archival
           soft X-ray observation (55 occurrences).
          When available, the authors list their 2MASS counterpart source matched
           within 5 arcsec of angular distance in Table 2;
     12 = Unknown class III includes sources without archival soft X-ray
           observations (38 occurrences);
     15 = Multiple class indicates the case where there are more than one
           soft X-ray detection (10 occurrences);
     20 = Galactic center: Sagittarius A*;
     30 = Galaxy Cluster (26 occurrences);
     40 = Seyfert I (Sy1; Sy 1.0-1.8; 512 occurrences) includes high-z
           broad-line AGN (N=2);
     50 = Seyfert II (Sy2; Sy 1.9-2.0; 317 occurrences) includes Sy2 candidates
           (10 occurrences) that present narrow emission lines in their
           optical spectral energy distribution;
     60 = LINER (6 occurrences);
     70 = Unknown AGN: X-ray sources associated with galaxies whose optical
           spectra and type classifications are not known (114 occurrences);
     80 = Beamed AGN (Blazar/FSRQ; 156 occurrences);
     90 = Cataclysmic Variable ("CV") star (75 occurrences);
    100 = Symbiotic star (4 occurrences);
    110 = Other star (13 occurrences);
    120 = Open star cluster (1 occurrence);
    130 = Starburst galaxy: M82;
    140 = Compact group of galaxies: Arp 318;
    150 = Pulsar (25 occurrences);
    160 = Supernova remnant (SNR; 7 occurrences);
    170 = Nova (6 occurrences);
    180 = High mass X-ray binary (HMXB; 108 occurrences);
    190 = Low mass X-ray binary (LMXB; 109 occurrences);
    200 = Other X-ray binary (XRB; 8 occurrences);
    210 = Globular Cluster (GC; 1 occurrence);
    220 = Molecular cloud (2 occurrences);
    230 = Gamma-ray source (1 occurrence).

Source_Type
The detailed source type.

Contact Person

Questions regarding the SWBAT105M database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Wednesday, 23-Nov-2022 19:37:33 EST