Positional accuracy as a measure of Chandra's optical distortions

被引：3

作者：

Beckerman, E ^{[1
]}

Aldcroft, T ^{[1
]}

Gaetz, TJ ^{[1
]}

Jerius, D ^{[1
]}

Nguyen, D ^{[1
]}

Tibbetts, M ^{[1
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

X-RAY AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY XIII | 2004年 / 5165卷

关键词：

Chandra; HRMA; optical distortions; positional accuracy; X-ray optics;

D O I：

10.1117/12.509381

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

We present a study of Chandra's optical distortions by examining the positional accuracy of observed sources on the HRC-I. We investigate the Chandra mirror and detector models' ability to reproduce the detector locations of observed sources by simulating similar to160 calibration observations of AR Lac, HR 1099, and LMC X-1. To study the optical distortions of the mirrors more directly, we compare a 63 ksec observation of the Orion Nebular Cluster (ONC) with positions based on the well-determined optical astrometry of the cluster. We simulate observations of 100 reasonably bright sources from the Hillenbrand 1997(1) catalog of the ONC and compare the simulated positions with their observed positions. Offsets between the optical positions and the observed X-ray positions help determine a map of the optical distortions of the Chandra mirrors.

引用

页码：445 / 456

页数：12

共 12 条

[1] ALDCROFT T, 2003, ALIGNMENT DRIFT IRU
[2] ALDCROFT T, 2002, CHANDRA ABSOLUTE AST
[3] *CHANDR XRAY CTR, CHANDR CAL DAT
[4] *CHANDR XRAY CTR, PSF PROJ RAY DOC
[5] *CHANDR XRAY CTR, CHANDR INT AN OBS
[6] *CXC OPT GROUP, DET DOC
[7] FLACCOMIO E, 2003, COMMUNICATION JUN
[8] Constraints on the stellar/substellar mass function in the inner Orion Nebula Cluster
Hillenbrand, LA
Carpenter, JM
[J]. ASTROPHYSICAL JOURNAL, 2000, 540 (01) : 236 - 254
[9] On the stellar population and star-forming history of the Orion Nebula Cluster
Hillenbrand, LA
[J]. ASTRONOMICAL JOURNAL, 1997, 113 (05) : 1733 - 1768
[10] MCDOWELL J, 2001, COORDINATE SYSTEMS A

← 1 2 →