Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/201203/carpano-cal-2012.pdf Дата изменения: Tue May 13 17:38:24 2014 Дата индексирования: Wed Apr 13 13:33:28 2016 Кодировка: Поисковые слова: cygnus

An unbiased assessment of EPIC-pn Burst mode calibration
Stefania Carpano 2012 EPIC BOC meeting, Leicester


Tasks:
Define the optimal calibration sample, by systematically analysing the whole XMM archive Assess the energy reconstruction accuracy in burst mode through comparison of spectra with theoretical models exposures taken in other EPIC-pn modes simultaneous obser vations with other payloads Estimate the impact of X-ray loading Evaluate the performances of different possible ratedependent energy corrections


Source sample:
19 different objects

95 obser vations available in burst mode (3 of them public soon)

Te yp

Name (+number of obser v.)
Cygnus X-1 (4), Cygnus X-2 (8), GRS 1915+105 (11), GX too weak), 4U 1700-37 (4), MAXI J0556-332 (2), IGR XTE J650-500 (1) and GX 17+2 (3: soon public) GRB 110328A (1, too weak)

SNRs Crab (36), Cas-A (1), N132D (2: only 400 sec) X-ray 339-4 (5), GRO J1655-40 (6), Aql X-1 (4), PSR 0540 (3: binaries J17091-3624 (1), XTE J17520-223 (1), XTE J1817-330 (1), GRB

Quasar 3C273 (1, too weak)


Looking for narrow emission/absorption lines
4U 1700-37: bright emission line at 6.4 keV Cas-A: 10 emission lines within 0.8-7.5 keV. Identification of lines complex comparison with full-frame and timing mode GRO J1655-40 and GRS 1915+105: absorption lines from Fe in [6.6-7.0]keV but identification not easy


4U 1700-37
eclipsing HMXB in a 3.41-d orbit obser ved 4 times in burst mode on the 2001 17-18-19-20 February obs. 0083280401

performed during

eclipse and egress Shows different flaring states

in burst mode continuum can be

described with an absorbed power-law or disk blackbody + soft excess bright Fe K is visible at 6.4 keV


4U 1700-37: line energy with/without epfast correction

phabs(diskbb+gauss)

model in 5.-8. keV:


line shift from column to column
Spectra extracted for the 4th brightest columns separately (c36-c39)

4U 1700-37, obs. 0083280201:


Cas-A: comparison with timing and fullframe mode

Note: MOS2 spectrum in full-frame mode, multiplied by 2


Cas-A: lines energy ratio


Energy redistribution in low part of the spectrum

Cygnus X-1 (medium filter)

Cygnus X-2 (medium and thin filter)

Spectrum around SiO2 edge at 528eV not properly described


X-ray loading
X-ray loading: inclusion of X-ray events in the PN offset map Occurs when too many X-ray events are detected per pixel during the offset map calculation Effect of X-ray loading: spectra are displaced towards lower energies Spectral impact in Timing Mode: XMM-SOC-CAL-TN-0094 using Crab spectra with offset map calculated with CLOSED filter. Burst mode: Crab obser vation with offset map in CLOSED filter, performed in February. Analysis of data soon. Example: X-ray loading vs X-ray intensity


On-going work
Continue to assess the energy reconstruction accuracy and the rate-dependent energy correction in burst mode, by analysing the source sample and compare spectra with other payloads or other obser ving modes Asses the impact of X-ray loading by analysing the data of the Crab with offset map taken with CLOSED filter