CIAO 4.15, DS9 8.4, MARX 5.5.2 released
The Chandra X-ray Center (CXC) is pleased to announce that version 4.15 of CIAO ("Chandra Interactive Analysis of Observations") is now available for download from http://cxc.cfa.harvard.edu/ciao/download.
CIAO 4.15 includes version 8.4 of SAOImage DS9 (the astronomical imaging and data visualization application). DS9 can also be downloaded and installed as a stand-alone application from https://ds9.si.edu/site/Download.html.
Version 5.5.2 of MARX (the Chandra on-orbit performance simulator) can be installed as part of the CIAO installation or separately from http://space.mit.edu/CXC/MARX
Notable change and improvements (read the complete release notes for full details):
CIAO can be installed using the conda package manager. Users can install the conda edition of CIAO with Python 3.10, 3.9, or 3.8 on Linux and Mac. The ciao-install script can also be used to install CIAO 4.15 without conda, now with Python 3.9.
wavdetect updates to improve robustness of detecting low significance sources and to remove artificial duplicate sources.
tg_resolve_events now properly resolves HRC events in the HEG/MEG overlapping region.
Improved uniformity including scripts adding HISTORY records, images recognizing NULL values, and copying world coordinate systems (WCS) from images to tables.
Updated to version 12.12.1c of the XSPEC model library.
Updates in the chi2xspecvar statistics
Models can now be frozen or thawed when accessing the model objects directly.
Updates in filtering and grouping
The latest release of the contributed CIAO scripts includes several new scripts and important updates, including
psf_contour (new) creates source regions based on simulated PSFs.
bkg_fixed_counts (new) creates background regions which enclosed a specified number of counts.
aplimits (new) computes upper limits for false detection and missed detections.
specextract now, by default, uses the center of the extraction region when computing PSF fractions and unweighted ARFs. The new resp_pos parameter allows users to select different algorithms to determine the response position, including the previous MAX algorithm (location of pixel with maximum value).
srcflux supports user plugins to perform custom analysis.
dax added an interactive tool to compute grating coordinates.
For more details and a complete list see the Analysis Scripts release notes.
CIAO 4.15 is available for the following platforms (see also the Platform Support Page):
64-bit Linux distributions, CentOS7 / Ubuntu 18.04 era and newer
macOS Intel x86 and Apple ARM (M1/M2, using Rosetta2 emulation), Catalina (10.15) through Ventura (13).
New layout views: Basic and Advanced
New Illustration: users can add graphics for presentations
Fade between images, save as GIF movies
Improvements in access to regions' analysis results via XPA and SAMP.
For a complete list of changes see the SAOImageDS9 version 8.4 Release Notes page.
The MARX 5.5.2 release (http://space.mit.edu/cxc/marx) upgrades the calibration data used by MARX to CalDB 4.10.2
MARX 5.5.2 is the version that should be used for cycle 25 proposal preparation.
See the MARX changelog for further details on this release.
The existing version of the Chandra CALDB (version 4.10.2) remains valid and does not require updating for CIAO 4.15
As always please send questions and requests for enhancements to the CXC HELPDESK.
CIAO, CALDB and DS9 are a collaborative effort between the SAO/CXC Science Data Systems group, the SAO/CXC Data System Division, and MIT/CXC personnel. MARX is created and maintained by the MIT/CXC/HETG group.