From 2a7a9c593bdeb6c12455531c76bfbbb04a1cc240 Mon Sep 17 00:00:00 2001 From: Markus Demleitner Date: Thu, 5 Jun 2025 14:06:03 -0400 Subject: [PATCH] + response-function in product-type This is a first draft, still missing rmf and in need of a bit more rationale; Ian is going to review this. --- VEP-new.txt | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 VEP-new.txt diff --git a/VEP-new.txt b/VEP-new.txt new file mode 100644 index 0000000..8527956 --- /dev/null +++ b/VEP-new.txt @@ -0,0 +1,44 @@ +Vocabulary: http://www.ivoa.net/rdf/product-type +Author: msdemlei@ari.uni-heidelberg.de +Date: 2025-06-05 + +New Term: response-function +Action: Addition +Label: Response Function +Description: A mapping between a physical quantity and an observable + quantity as for instance, the response of a CCD in the focal plane of + an instrument to the flux from a point source. +Relationships: +Used-in: As a parent of #psf + +New Term: psf +Action: Addition +Label: Point Spread Function +Description: The distribution of detected particles emitted by a point + source for a given observation configuration. +Relationships: narrower than response-function +Used-in: Try + select top 20 * from ivoa.ObsCore where dataproduct_type='psf' + on the TAP service at . + +New Term: arf +Action: Addition +Label: Ancillary Response File +Description: A 2D array giving for each pixel the effective area times + the quantum efficiency resulting from the combined + telescope/filter/detector areas averaged over the observation time. + This is generally dependent on the energies of the messenger particles + used. +Relationships: narrower than response-function +Used-in: Try + select top 20 * from ivoa.ObsCore where dataproduct_type='arf' + on the TAP service at . + +Rationale: + #response-function-s need to be labelled as products in obscore + tables to make them discoverable independently of any particular + observation. For instance, Chandra users have extracted a few sources + from the catalogue and now want to locate PSFs for the observations + that went into these sources. They will be able to do that by + constraining dataproduct_type to psf and giving further constraints on + space, time, or energy.