6 papers
Radial Velocity Evidence for a Post-Mass-Transfer Massive Binary System: NaSt1
Kittipong Wangnok, Samaporn Tinyanont, Ryan M. Lau +11
We present multi-epoch high-resolution optical spectroscopy () of the emission-line object NaSt1 to test its proposed binary nature, along with long-term multiba…
Extraction method for response functions from X-ray light curves of AGN by optimization algorithm
Sanhanat Deesamutara, Tirawut Worrakitpoonpon, Poemwai Chainakun +4
We introduce a numerical optimization method to extract the X-ray reverberation response functions from the multi-band light curves of the active galactic nuclei. This approach doe…
Hybrid corona and transient soft X-ray lags in Fairall 9
K. Khanthasombat, P. Chainakun, W. Luangtip +2
Fairall 9 is among the most massive Seyfert galaxies exhibiting a strong soft X-ray excess, but it is challenging to probe soft X-ray reverberation lags (if any) due to the long in…
Revealing Hidden Repeaters in the CHIME/FRB Catalog: Semi-Supervised Insights into the Fast Radio Burst Population
N. Mankatwit, P. Thongkonsing, S. Loekkesee +3
Fast radio bursts (FRBs) are millisecond-duration extragalactic transients, observationally classified as repeaters or nonrepeaters. This classification may be biased, as some appa…
The brightest X-ray AGNs at redshift
Cameron Heather, Teeraparb Chantavat, Siri Chongchitnan +1
Given recent X-ray observations of high-redshift active galactic nuclei (AGNs), we consider whether the extreme luminosities of these AGNs are consistent with current semi-analytic…
Extracting the X-ray reverberation response functions from the AGN light curves using an autoencoder
Sanhanat Deesamutara, Poemwai Chainakun, Tirawut Worrakitpoonpon +5
We study the X-ray reverberation in active galactic nuclei (AGN) using the variational autoencoder (VAE), which is a machine-learning algorithm widely used for signal processing an…