Recent Progress in HXMT Calibration and Research
Progress has been made in the calibration of the Hard X-ray Modulation Telescope (HXMT) at the Institute of High Energy Physics (IHEP) since the last joint calibration meeting led by Shu Zhang. The calibration work includes timing system analyses, background model strategies, calibration pulse-on-off methods, ARF verifications, and research on new targets. Research on the new transient MAXI JJ1535-571 is near completion, focusing on the Quasi-Periodic Oscillation (QPO) and time lag phenomenon. Spectral fits related to the Cyclotron Resonant Scattering Feature (CRSF) have been successful, highlighting the dedication to enhancing the accuracy and efficacy of the HXMT system.
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Presentation Transcript
HXMT in IHEP progresses since last joint calibration meeting Shu Zhang
Outline Calibration Background model Research progresses New targets
Calibration Timing system TOA analyses of Crab show timing precisions are < 100 us.
Calibration EC relationship: HE 4 lines in background, ME 1 line in background LE a few line in Cas A spectrum
Calibration ARF, strategy pulse on-off, independent of background model Input: Pulse-on energy spectrum Proper method to revise the ARF. Progress: Pulse-on spectrum from RXTE data; Take polynomial in xspec to fit the spectrum, fix the pulse-on spectral parameters.
Verification of the calibration ARF: 1 use the Crab pulse-on spectrum from Bepposax and Nustar as input for cross check 2 Crab nebula spectrum with 1th version of background and total systematic error? 3 test with pulse-on spectrum of other pulsar in outburst of HXMB systems. 4 stability of the revised ARF, by investigating the Crab pulse-on or nebular spectrum over different time spans. 5 ME ARF revision dependence of the source flux level? EC: 1 LE : Cas A spectrum fitting and other source with line emissions 2 ME : silver line 3 HE: fitting the lines in the background spectrum? EC precisions have influences of measuring lines at soft X-rays and CRSF at hard X-rays. May also have influence on the continuum spectral analysis. Version 1 of calibration on the response matrix? Total systematic error ?
Background model Strategy: consider the relation between blind detector and the other detectors. Input: blank sky observation; Proper EC to account properly for the line emission in the background spectrum Proper data selection criteria
Background model Test and verification, Input: The other blank sky ME BKG model uncertainty: ME efficiency evolving? Systematic error in background model? Version 1 background model will be released and packed into HXMT data analysis software.
Research progresses Paper on the new transient MAXI JJ1535-571 almost ready for reporting the QPO and time lag (HuangYue). Research on the CRSF: obtained good spectral fits with the updated ARF to the source of Her X-1 (Ge MingYu) Paper on the new transient Swift J0243.6+614 : timing and pulse profile evolution (Ge MingYu).
Spin profile evolution of Swift J0243.6+614 HE LE
Her X-1 CRSF Her X-1 3th observation 11
New targets After last December, the following targets that not observed previously by HXMT came into FOV: Swift J1658.2-4242 : 430 ks (outburst of newly discovered HMXB) MAXI J1820+070: 410 ks (the new X-ray nova and black hole candidate) Aql X-1: 30ks (outburst decay) NGC 6624 : 30ks (globular star cluster, atoll source 4U 1820-30: spin, type-I burst, orbit 685 s , with P_dot, 171 days period)
