Page, MJ;
Chan, N;
Breeveld, AA;
Talavera, A;
Yershov, V;
Kennedy, T;
Kuin, NPM;
... Carter, M; + view all
(2017)
The calibration of read-out-streak photometry in the XMM-Newton Optical Monitor and the construction of a bright-source catalogue.
Monthly Notices of the Royal Astronomical Society
, 466
(1)
pp. 1061-1070.
10.1093/mnras/stw3121.
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Abstract
The dynamic range of the XMM-Newton Optical Monitor (XMM-OM) is limited at the bright end by coincidence loss, the superposition of multiple photons in the individual frames recorded from its micro-channel-plate (MCP) intensified charge-coupled device (CCD) detector. One way to overcome this limitation is to use photons that arrive during the frame transfer of the CCD, forming vertical read-out streaks for bright sources. We calibrate these read-out streaks for photometry of bright sources observed with XMM-OM. The bright source limit for read-out streak photometry is set by the recharge time of the MCPs. For XMM-OM we find that the MCP recharge time is 0.55 ms. We determine that the effective bright limits for read-out streak photometry with XMM-OM are approximately 1.5 magnitudes brighter than the bright source limits for normal aperture photometry in full-frame images. This translates into bright-source limits in Vega magnitudes of UVW2=7.1, UVM2=8.0, UVW1=9.4, U=10.5, B=11.5, V=10.2 and White=12.5 for data taken early in the mission. The limits brighten by up to 0.2 magnitudes, depending on filter, over the course of the mission as the detector ages. The method is demonstrated by deriving UVW1 photometry for the symbiotic nova RR Telescopii, and the new photometry is used to constrain the e-folding time of its decaying UV emission. Using the read-out streak method, we obtain photometry for 50 per cent of the missing UV source measurements in version 2.1 of the XMM-Newton Serendipitous UV Source Survey (XMM-SUSS 2.1) catalogue.
| Type: | Article |
|---|---|
| Title: | The calibration of read-out-streak photometry in the XMM-Newton Optical Monitor and the construction of a bright-source catalogue |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stw3121 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stw3121 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Space vehicles: instruments, techniques: photometric, stars: individual: RR Tel, ultraviolet: general |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1534574 |
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