The First MAXI/GSC Catalog in the High Galactic-Latitude Sky
Abstract
We present the first unbiased source catalog of the Monitor of All-sky X-ray Image (MAXI) mission at high Galactic latitudes (|b| > 10°), produced from the first 7-month data (2009 September 1 to 2010 March 31) of the Gas Slit Camera in the 4-10 keV band. We have developed an analysis procedure to detect faint sources from the MAXI data, utilizing a maximum likelihood image fitting method, where the image response, background, and detailed observational conditions are taken into account. The catalog consists of 143 X-ray sources above the 7 σ significance level with a limiting sensitivity of ∼ 1.5× 10-11erg cm-2s-1 (1.2 mCrab) in the 4-10 keV band. Among them, we have identified 38 Galactic/LMC/SMC objects, 48 galaxy clusters, 39 Seyfert galaxies, 12 blazars, and 1 galaxy. Four other sources are confused with multiple objects, and one remains unidentified. The log N -log S relation of extragalactic objects is in good agreement with the HEAO-1 A-2 result, although the list of the brightest AGNs in the entire sky has significantly changed since that produced 30 yr ago.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- November 2011
- DOI:
- 10.1093/pasj/63.sp3.S677
- arXiv:
- arXiv:1108.5516
- Bibcode:
- 2011PASJ...63S.677H
- Keywords:
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- catalogs;
- galaxies: active;
- surveys;
- X-rays: galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 14 pages, including 10 figures and 3 tables, PASJ accepted