Search Publications
From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources
Rodriguez, Antonio C.
Galactic X-ray sources are diverse, ranging from active M dwarfs to compact object binaries, and everything in between. The X-ray landscape of today is rich, with point source catalogs such as those from XMM-Newton, Chandra, and Swift, each with ≳105 sources and growing. Furthermore, X-ray astronomy is on the verge of being transformed …
A Serendipitous Observation of the Recently Discovered Cataclysmic Variable TUVO-21acq
Kuntz, K. D.; Pfeifle, Ryan W.; Weaver, Kimberly A. +2 more
The recently discovered non-magnetic cataclysmic variable TUVO-21acq was serendipitously observed in a quiescent state during an XMM-Newton observing campaign for the starburst galaxy NGC 4945. Data from this campaign was combined with archival serendipitous XMM observations to examine its X-ray and UV/optical characteristics. TUVO-21acq was found…
A Diamond Ring in X-Ray: Investigating the Diffuse Emission of Supernova Remnant G28.8+1.5
Zhang, Kaiyue
Supernova remnants are products of supernova explosions, which are usually observed in the X-ray band. However, the diffuse emission from the galactic supernova remnant G28.8+1.5 has been overlooked following initial searches for pulsars and pulsar wind nebulae. This paper presents background-subtracted imaging and spatial-resolved spectral analys…
The Large Array Survey Telescope-Pipeline. I. Basic Image Reduction and Visit Coaddition
Fallah Ramazani, V.; Ofek, E. O.; Ben-Ami, S. +18 more
The Large Array Survey Telescope (LAST) is a wide-field telescope designed to explore the variable and transient sky with a high cadence and to be a test-bed for cost-effective telescope design. A LAST node is composed of 48 (32 already deployed), 28 cm f/2.2 telescopes. A single telescope has a 7.4 deg2 field of view and reaches a 5σ l…
Broadband X-Ray Spectral Analysis of the ULX NGC 1313 X-1 Using JeTCAF: Origin of the ULX Bubble
Mondal, Santanu; Palit, Biswaraj
NGC 1313 X-1 is a mysterious ultraluminous X-ray (ULX) source whose X-ray-powering mechanism and bubble-like structure surrounding the source are topics of intense study. Here, we perform an X-ray spectroscopic study of the source using joint XMM-Newton and NuSTAR observations taken during 2012-2017. The combined spectra cover the energy band 0.3-…
A Census of Archival X-Ray Spectra for Modeling Tidal Disruption Events
Wen, Sixiang; Jonker, Peter G.; Stone, Nicholas C. +3 more
Tidal disruption events (TDEs) are highly energetic phenomena that occur when a star is tidally disrupted by the central massive black hole in a galaxy. Fitting the observed X-ray spectra of TDEs with a first-principles, general-relativistic slim-disk model for the emission from the inner accretion disk can constrain the black hole mass M •
Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449
Fang, Guanwen; Gu, Qiusheng; Xu, Jun +5 more
We present the multiwavelength analysis of a heavily obscured active galactic nucleus (AGN) in NGC 449. We first constructed a broadband X-ray spectrum using the latest NuSTAR and XMM-Newton data. Its column density (≃1024 cm-2) and photon index (Γ ≃ 2.4) were reliably obtained by analyzing the broadband X-ray spectrum. Howev…
An Optical and X-Ray Study of the Contact Binary, BH Cassiopeia
Zheng, Jie; Zhang, Yu; Esamdin, Ali +10 more
We present the revised and high-quality CCD time series observations in 2017 and 2018 of the W UMa-type contact binary BH Cas. The combination of our new determinations of minimum times and those collected from the literatures reveal a long-term period increase with a rate of dP/dt = +3.27 × 10-7 day yr-1, which can be accoun…
catsHTM: A Tool for Fast Accessing and Cross-matching Large Astronomical Catalogs
Soumagnac, Maayane T.; Ofek, Eran O.
Fast access to large catalogs is required for some astronomical applications. Here we introduce the catsHTM tool, consisting of several large catalogs reformatted into HDF5-based file format, which can be downloaded and used locally. To allow fast access, the catalogs are partitioned into hierarchical triangular meshes and stored in HDF5 files. Se…
Visualization of Multi-mission Astronomical Data with ESASky
de Marchi, Guido; Merín, Bruno; O'Mullane, William +17 more
ESASky is a science-driven discovery portal to explore the multi-wavelength sky and visualize and access multiple astronomical archive holdings. The tool is a web application that requires no prior knowledge of any of the missions involved and gives users world-wide simplified access to the highest-level science data products from multiple astrono…