The 7-year MAXI/GSC X-ray Source Catalog in the High Galactic-Latitude Sky (3MAXI)

Abstract

We present the third MAXI/GSC catalog in the high Galactic-latitude sky ($|b|>10^{\circ }$) based on the 7-year data from 2009 August 13 to 2016 July 31, complementary to that in the low Galactic-latitude sky ($|b|<10^{\circ }$; Hori et al. 2018). We compile 682 sources detected at significances of $s_{\mathrm{D},4-10\mathrm{keV}}\ge 6.5$ in the 4--10 keV band. A two-dimensional image fit based on the Poisson likelihood algorithm ($C$-statistics) is adopted for the detections and constraints on their fluxes and positions. The 4--10 keV sensitivity reaches $\approx 0.48$ mCrab, or $\approx 5.9\times 10^{-12}$ erg cm${}^{-2}$ s${}^{-1}$, over the half of the survey area. Compared with the 37-month catalog (Hiroi et al. 2013), which adopted a threshold of $s_{\mathrm{D},4-10\mathrm{keV}}\ge 7$, the source number increases by a factor of $\sim$1.4. The fluxes in the 3--4 keV and 10--20 keV bands are further estimated, and hardness ratios (HRs) are calculated using the 3--4 keV, 4--10 keV, 3--10 keV, and 10--20 keV band fluxes. We also make the 4--10 keV lightcurves in one year bins for all the sources and characterize their variabilities with an index based on a likelihood function and the excess variance. Possible counterparts are found from five major X-ray survey catalogs by Swift, Uhuru, RXTE, XMM-Newton, and ROSAT, and an X-ray galaxy-cluster catalog (MCXC). Our catalog provides the fluxes, positions, detection significances, HRs, one-year bin lightcurves, variability indices, and counterpart candidates.

arXiv comment18 pages, 15 figures, accepted for publication in ApJS. The links to the full data: Tab. A ( http://www.kusastro.kyoto-u.ac.jp/~kawamuro/arxiv/3mx_TA.dat ), Tab. B ( http://www.kusastro.kyoto-u.ac.jp/~kawamuro/arxiv/3mx_TB.dat ), Fig. A ( http://www.kusastro.kyoto-u.ac.jp/~kawamuro/arxiv/3mx_FA.pdf ), and the Fig. A data ( http://www.kusastro.kyoto-u.ac.jp/~kawamuro/arxiv/3mx_FA.txt )

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