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View article: Fast, low noise CCD systems for future strategic x-ray missions
Fast, low noise CCD systems for future strategic x-ray missions Open
Future strategic X-ray missions, such as the Advanced X-ray Imaging Satellite (AXIS) and those targeted by the Great Observatories Maturation Program (GOMaP), require fast, low-noise X-ray imaging spectrometers. To achieve the speed and no…
View article: Ground calibration plans for the AXIS high speed camera
Ground calibration plans for the AXIS high speed camera Open
The Advanced X-ray Imaging Satellite (AXIS), an astrophysics NASA probe mission currently in phase A, will provide high-throughput, high-spatial resolution X-ray imaging in the 0.3 to 10 keV band. We report on the notional ground calibrati…
View article: The high-speed X-ray camera on AXIS: design and performance updates
The high-speed X-ray camera on AXIS: design and performance updates Open
AXIS, a Probe mission concept now in a Phase A study, will provide transformative studies of high-energy astrophysical phenomena thanks to its high-resolution X-ray spectral imaging. These capabilities are enabled by improvements to the mi…
View article: Design, development, and commissioning of a flexible test setup for the AXIS prototype detector
Design, development, and commissioning of a flexible test setup for the AXIS prototype detector Open
The Advanced X-ray Imaging Satellite (AXIS) is one of two candidate mission concepts selected for Phase-A study for the new NASA Astrophysics Probe Explorer (APEX) mission class, with a planned launch in 2032. The X-ray camera for AXIS is …
View article: Development and testing of integrated readout electronics for next generation SiSeRO (Single electron Sensitive Read Out) devices
Development and testing of integrated readout electronics for next generation SiSeRO (Single electron Sensitive Read Out) devices Open
The first generation of Single electron Sensitive Read Out (SiSeRO) amplifiers, employed as on-chip charge detectors for charge-coupled devices (CCDs) have demonstrated excellent noise and spectral performance: a responsivity of around 800…
View article: Using the XMM-Newton small window mode to investigate systematic uncertainties in the particle background of X-ray charge-coupled device detectors
Using the XMM-Newton small window mode to investigate systematic uncertainties in the particle background of X-ray charge-coupled device detectors Open
The level and uncertainty of the particle-induced background in charge-coupled device (CCD) detectors play a crucial role in future X-ray instruments, such as the Wide Field Imager (WFI) onboard Athena. To mitigate the background systemati…
View article: Predicting the Redshift of Gamma-Ray Loud AGNs Using Supervised Machine Learning. II
Predicting the Redshift of Gamma-Ray Loud AGNs Using Supervised Machine Learning. II Open
Measuring the redshift of active galactic nuclei (AGNs) requires the use of time-consuming and expensive spectroscopic analysis. However, obtaining redshift measurements of AGNs is crucial as it can enable AGN population studies, provide i…
View article: Using Multivariate Imputation by Chained Equations to Predict Redshifts of Active Galactic Nuclei
Using Multivariate Imputation by Chained Equations to Predict Redshifts of Active Galactic Nuclei Open
Redshift measurement of active galactic nuclei (AGNs) remains a time-consuming and challenging task, as it requires follow up spectroscopic observations and detailed analysis. Hence, there exists an urgent requirement for alternative redsh…
View article: Using Multivariate Imputation by Chained Equations to Predict Redshifts of Active Galactic Nuclei
Using Multivariate Imputation by Chained Equations to Predict Redshifts of Active Galactic Nuclei Open
Redshift measurement of active galactic nuclei (AGNs) remains a time-consuming and challenging task, as it requires follow up spectroscopic observations and detailed analysis. Hence, there exists an urgent requirement for alternative redsh…
View article: North Ecliptic Pole merging galaxy catalogue
North Ecliptic Pole merging galaxy catalogue Open
Aims. We aim to generate a catalogue of merging galaxies within the 5.4 sq. deg. North Ecliptic Pole over the redshift range 0.0 < z < 0.3. To do this, imaging data from the Hyper Suprime-Cam are used along with morphological parameters de…
View article: Predicting the redshift of gamma-ray loud AGNs using Supervised Machine Learning: Part 2
Predicting the redshift of gamma-ray loud AGNs using Supervised Machine Learning: Part 2 Open
Measuring the redshift of active galactic nuclei (AGNs) requires the use of time-consuming and expensive spectroscopic analysis. However, obtaining redshift measurements of AGNs is crucial as it can enable AGN population studies, provide i…
View article: Environmental effects on AGN activity via extinction-free mid-infrared census
Environmental effects on AGN activity via extinction-free mid-infrared census Open
How does the environment affect active galactic nucleus (AGN) activity? We investigated this question in an extinction-free way by selecting 1120 infrared (IR) galaxies in the AKARI North Ecliptic Pole Wide field at redshift z ≤ 1.2. A uni…
View article: Active galactic nuclei catalog from the AKARI NEP-Wide field
Active galactic nuclei catalog from the AKARI NEP-Wide field Open
\nContext. The north ecliptic pole (NEP) field provides a unique set of panchromatic data that are well suited for active galactic nuclei (AGN) studies. The selection of AGN candidates is often based on mid-infrared (MIR) measurements. Suc…
View article: Optically detected galaxy cluster candidates in the <i>AKARI</i> North Ecliptic Pole field based on photometric redshift from the Subaru Hyper Suprime-Cam
Optically detected galaxy cluster candidates in the <i>AKARI</i> North Ecliptic Pole field based on photometric redshift from the Subaru Hyper Suprime-Cam Open
Galaxy clusters provide an excellent probe in various research fields in astrophysics and cosmology. However, the number of galaxy clusters detected so far in the AKARI North Ecliptic Pole (NEP) field is limited. In this work, we provide g…
View article: An active galactic nucleus recognition model based on deep neural network
An active galactic nucleus recognition model based on deep neural network Open
To understand the cosmic accretion history of supermassive black holes, separating the radiation from active galactic nuclei (AGNs) and star-forming galaxies (SFGs) is critical. However, a reliable solution on photometrically recognizing A…
View article: Searching for previously unknown classes of objects in the AKARI-NEP\n Deep data with fuzzy logic SVM algorithm
Searching for previously unknown classes of objects in the AKARI-NEP\n Deep data with fuzzy logic SVM algorithm Open
In this proceedings application of a fuzzy Support Vector Machine (FSVM)\nlearning algorithm, to classify mid-infrared (MIR) sources from the AKARI NEP\nDeep field into three classes: stars, galaxies and AGNs, is presented. FSVM is\nan imp…
View article: Searching for previously unknown classes of objects in the AKARI-NEP Deep data with fuzzy logic SVM algorithm
Searching for previously unknown classes of objects in the AKARI-NEP Deep data with fuzzy logic SVM algorithm Open
In this proceedings application of a fuzzy Support Vector Machine (FSVM) learning algorithm, to classify mid-infrared (MIR) sources from the AKARI NEP Deep field into three classes: stars, galaxies and AGNs, is presented. FSVM is an improv…