K. Yamazaki

The First MAXI/GSC Catalog in the High Galactic-Latitude Sky

AbstractWe present the first unbiased source catalog of the Monitor of All-sky X-ray Image (MAXI) mission athigh Galactic latitudes (|b|>10 ◦ ), produced from the first 7-month data (2009 September 1 to 2010 March31) of the Gas Slit Camera in the 4–10 keV band. We develop an analysis procedure to detect faint sourcesfrom 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 143X-ray sources above 7 sigma significance level with a limiting sensitivity of ∼ 1.5×10 −11 ergs cm −2 s −1 (1.2 mCrab) in the 4–10 keV band. Among them, we identify 38 Galactic/LMC/SMC objects, 48 galaxyclusters, 39 Seyfert galaxies, 12 blazars, and 1 galaxy. Other 4 sources are confused with multiple objects,and one remains unidentified. The log N - log S relation of extragalactic objects is in a good agreementwith the HEAO-1 A-2 result, although the list of the brightest AGNs in the entire sky has significantlychanged since that in 30 years ago.Key words:catalogs — surveys — galaxies: active — X-rays: galaxies1. INTRODUCTIONAll-sky X-ray surveys are powerful tools to investigatethe whole populations of active and hot phenomena inthe universe at the brightest flux end. The strong X-ray emitters include Galactic objects such as active stars,SNRs, pulsars, CVs, low mass and high mass X-ray bi-naries (with a neutron star or a black hole as the pri-mary), and extragalactic objects, mainly active galacticnuclei (AGNs; Seyfert galaxies and blazars) and clustersof galaxies. The source catalog consisting of a statisticallywell-defined sample detected from an unbiased survey isa primary product on which many subsequent studies arebased. For extragalactic populations, in particular, theseresults define the “local” sample in the present universe,the end point of their cosmological evolution. Thus, toestablish the statistical properties of bright X-ray sourcesusing the best quality data over the entire sky has alwaysbeen a key issue in high energy astrophysics.Past all-sky X-ray surveys indeed brought valuable in-formation on the X-ray source populations. In the softX-ray band, the ROSAT mission conducted an all-sky sur-vey in the 0.1–2.4 keV band, producing the ROSAT All-Sky Survey (RASS) Bright Source Catalog (BSC; Voges

Revisit of Local X-Ray Luminosity Function of Active Galactic Nuclei with the MAXI Extragalactic Survey

We construct a new X-ray (2--10 keV) luminosity function of Compton-thin active galactic nuclei (AGNs) in the local universe, using the first MAXI/GSC source catalog surveyed in the 4--10 keV band. The sample consists of 37 non-blazar AGNs at

Spectral Evolution of a New X-Ray Transient MAXI J0556−332 Observed by MAXI, Swift, and RXTE

z=0.002-0.2

A spectral study of the black hole candidate XTE J1752-223 in the high/soft state with MAXI, Suzaku, and Swift

, whose identification is highly (

Large X-ray flares on stars detected with MAXI/GSC: A universal correlation between the duration of a flare and its X-ray luminosity

>97%

Outburst of LSV+44 17 Observed by MAXI and RXTE, and Discovery of a Dip Structure in the Pulse Profile

) complete. We confirm the trend that the fraction of absorbed AGNs with

Long-Term Monitoring of the Black Hole Binary GX 339-4 in the High/Soft State during the 2010 Outburst with MAXI/GSC

N_{rm H} > 10^{22}

A Large X-Ray Flare from a Single Weak-Lined T Tauri Star TWA-7 Detected with MAXI GSC

cm

Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM

^{-2}

Early results of MAXI (Monitor of All-sky X-ray Image) on ISS

rapidly decreases against luminosity (