2024PASP..136d5005B

Query : 2024PASP..136d5005B

2024PASP..136d5005B - Publ. Astron. Soc. Pac., 136, part no 4, 5005 (2024/April-0)

Likelihood-based Jump Detection and Cosmic Ray Rejection for Detectors Read Out Up-the-ramp.

BRANDT T.D.

Abstract (from CDS):

This paper implements likelihood-based jump detection for detectors read out up-the-ramp, using the entire set of reads to compute likelihoods. The approach compares the χ² value of a fit with and without a jump for every possible jump location. I show that this approach can be substantially more sensitive than one that only uses the difference between sequential groups of reads, especially for long ramps and for jumps that occur in the middle of a group of reads. It can also be implemented for a computational cost that is linear in the number of resultants. I provide and describe a pure Python implementation that can process a 10-resultant ramp on a 4096 × 4096 detector in ≈20 s, including iterative cosmic ray detection and 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. I also provide tests and demonstrations of the full ramp fitting and cosmic ray rejection approach on data from the 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..136d5005B

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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