2024PASP..136d5004B

Query : 2024PASP..136d5004B

2024PASP..136d5004B - Publ. Astron. Soc. Pac., 136, part no 4, 5004 (2024/April-0)

Optimal Fitting and Debiasing for Detectors Read Out Up-the-Ramp.

BRANDT T.D.

Abstract (from CDS):

This paper derives the optimal fit to a pixel's count rate in the case of an ideal detector read out nondestructively in the presence of both read and photon noise. The approach is general for any readout scheme, provides closed-form expressions for all quantities, and has a computational cost that is linear in the number of resultants (groups of reads). I also derive the bias of the fit from estimating the covariance matrix and show how to remove it to first order. The ramp-fitting algorithm I describe provides the χ² value of the fit of a line to the accumulated counts, which can be interpreted as a goodness-of-fit metric. I provide and describe a pure Python implementation of these algorithms that can process a 10-resultant ramp on a 4096 × 4096 detector in ≈8 s with bias removal on a single core of a 2020 Macbook Air. This Python implementation, together with tests and a tutorial notebook, are available at https://github.com/t-brandt/fitramp. A companion paper describes a jump detection algorithm based on hypothesis testing of ramp fits and demonstrates all algorithms on data from JWST.

Journal keyword(s): Astronomical detectors - Astronomical instrumentation

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 3324	OpC	10 37 20.8	-58 37 26						~	145	1

Query : 2024PASP..136d5004B

Basic data :

NGC 3324 -- Open Cluster
Other object types:	`OpC (2014A&A,OCl)`, `Cl* (2020A&A,C,...)`, `Cl? (2013A&A)`
ICRS coord. (ep=J2000) :	`10 37 20.8 -58 37 26 (Optical) [ ] E 2023A&A...674A..37G`
FK4 coord. (ep=B1950 eq=1950) :	`10 35 26.0 -58 21 50 [ ]`
Gal coord. (ep=J2000) :	`286.2211 -00.1721 [ ]`
Proper motions mas/yr :	`-7.112 2.782 [0.016 0.019 90] C` `2020A&A...633A..99C`
Radial velocity / Redshift / cz :	`V(km/s) -7.2 [2.4] / z(spectroscopic) -0.000024 [0.000008] / cz -7.20 [2.40] (Opt) C 2017A&A...600A.106C`
Parallaxes (mas):	`0.356 [0.007] C` `2020A&A...633A..99C`
Angular size (arcmin):	`11 11 90 (~) C` `2021MNRAS.503.5929B`

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`NGC 3324`	`OCl 819.0`	`[KPR2004b] 254`
`C 1035-583`	`OCl 819`	`[KPS2012] MWSC 1830`

References (145 between 1850 and 2026) (Total 145)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : NGC 3324

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NGC 3324

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