MAXI 15 Year Workshop for the Time Domain Astronomy

Session

10-1

Overview

10 Dec 2024, 10:30

CST Hall (in Bld. A in the map) (Nihon university)

Description

Chair: N. Kawai (RIKEN)

57. MAXI status and recent results

Tatehiro Mihara (RIKEN MAXI team)

10/12/2024, 10:30

20m

MAXI has been working for 15 years and contributing to a part of the time-domain astronomy by the quick alerts of transients. The main instrument GSC of MAXI has been stable after some damage occurred in the first year. The other instrument SSC has damaged due to the radiation damage. The main system of the MAXI suffered abrupt shut down twice in 2022 June. Since then SSC was stopped to reduce...

58. MAXI transients in 15 years

Hitoshi Negoro (Nihon University)

10/12/2024, 10:50

20m

MAXI discovered 35 newly discovered X-ray novae or short transients, including 14 or more black hole candidates and the first Be/whit-dwarf nova MAXI J0158-744. The nature of some of them are still unknown. MAXI also detected a number of X-ray novae and X-ray or gamma bursts. I briefly summarize those transients sources MAXI discoverd/detected in 15 years.

60. Swift and MAXI: 15 Years of Collaboration

Jamie Kennea (Penn State)

10/12/2024, 11:10

30m

The Neil Gehrels Swift Observatory, which turns 20 years old in November 2024, is an epochal mission for TDAMM science thanks to it's rapid response capabilities, allowing for fast turn around observation of transients both discovered by Swift itself, and other observatories. It's combination of sensitive X-ray and UV/Optical telescopes allows for broadband follow-up of events discovered by...

61. NuSTAR and MAXI: capturing transient sources near the Sun

Sean Pike (UC, San Diego)

10/12/2024, 11:40

20m

MAXI provides all-sky monitoring in the X-ray band, identifying multiple new sources each year, but a fraction of these transient sources falls too close to the Sun for most X-ray observatories to safely perform rapid follow-up observations. NuSTAR, however, is able to observe sources with much smaller angular separation from the Sun than other observatories, making it a uniquely capable tool...

165. An improved image fit method to create MAXI/GSC light curves and the search for embedded transient sources using more than 15 years MAXI data

Yuno Kudo (Nihon University)

poster

MAXI has discovered 35 new X-ray transients since 2009. Sources in source-crowded regions such as the Galactic bulge regions, however, have not been investigated intensively because of relatively low spatial resolution (~ 1 deg) X-ray cameras. We are therefore trying to discover X-ray novae and other transient objects by creating light curves at regions around the Galactic bulge at equal...

155. Development of FTOOLS-based software for MAXI/GSC light curves using image fits with point spread function

Mikio Morii (Japan Aerospace Exploration Agency)

poster

We, Science Satellite Operation and Data Archive Unit (C-SODA) in JAXA, have developed FTOOLS-based software (mxsim_psf and mxsim_bgd), which can make simulations of point spread function (PSF) and non X-ray background (NXB) of MAXI/GSC. These tools will be released from HEASARC, soon. By using these tools, we start to develop a tool to make MAXI/GSC light curves obtained by image-fits using...

154. MAXI observation of reflected X-ray by the Moon

Shino Sugawara (Rikkyo univ. and RIKEN)

poster

A strong solar flare of X6.3 class occurred on February 22, 2024. X-rays from the solar flare are reflected by the moon, MAXI captured the fluorescent X-rays. MAXI detected emission lines of three elements, Si, Ca, and Fe. Those were consistent with the main elements of the moon surface. We considered a model of the reflected X-rays by the moon and compared the intensities of the calculated...

156. Non-bias survey of the cluster of galaxies with MAXI

Yuki Taki (Rikkyo University and RIKEN)

poster

We analyzed 186 cluster of galaxies with MAXI and obtained luminosity, temperature, and abundance. Significant abundance was obtained from 32 clusters, whose average was 0.29 +- 0.06. It is consistent with the previous works. The temperature was obtained from 179 clusters, from which the relation between the luminosity and temperature was obtained as L is proportional to T^4.01. This value was...

174. Origin of Pink Noise in MAXI X-ray Sources

Masahiro Morikawa (Riken)

poster

A fair number of MAXI X-ray sources show pink noise (power index -0.8 to -1.2 ) in their power spectral density toward the lowest frequency, the inverse of 15 years. This pink noise is quite robust and reappears after thresholding, inverse-thresholding, and even after removing the energy information, leaving only the timing data. We explore the origin of this robust pink noise in MAXI sources....

151. Status of the MAXI Data Archive at DARTS and HEASARC

Ken Ebisawa (ISAS/JAXA)

poster

At DARTS (JAXA) and HEASARC (NASA), we maintain the permanent MAXI data archive, which keeps calibrated GSC event files on a daily basis. Any kind of data analysis is available using MAXI FTOOLS (mxproduct etc) and CALDB provided by HEASARC. Still, it is reported that there are minor discrepancies between the results obtained by DARTS/HEASRC archive and those by the public light curves and...