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Using JVLA data obtained from high-resolution observations at 5.5 GHz at multiple epochs in 2014 and 2019, we have detected a population of radio variables and transients in the radio bright zone at the Galactic center. With observations…

High Energy Astrophysical Phenomena · Physics 2021-01-06 Jun-Hui Zhao , Mark R. Morris , W. M. Goss

A Faraday rotation measure (RM) catalogue, or RM Grid, is a valuable resource for the study of cosmic magnetism. Using the second data release (DR2) from the LOFAR Two-metre Sky Survey (LoTSS), we have produced a catalogue of 2461…

We report on Chandra, NuSTAR, and MDM observations of two INTEGRAL sources, namely IGR J17528-2022 and IGR J20063+3641. IGR J17528-2022 is an unidentified INTEGRAL source, while IGR J20063+3641 was recently identified as a magnetic…

High Energy Astrophysical Phenomena · Physics 2021-06-30 Jeremy Hare , Jules P. Halpern , John A. Tomsick , John R. Thorstensen , Arash Bodaghee , Maica Clavel , Roman Krivonos , Kaya Mori

We present the results of our X-ray, ultraviolet, and optical follow-up campaigns of 1RXS J165424.6-433758, an X-ray source detected with the \textit{Swift} Deep Galactic Plane Survey (DGPS). The source X-ray spectrum (\textit{Swift} and…

We have obtained HST/STIS data for a total of eleven polars as part of a program aimed to compile a homogeneous database of high-quality far-ultraviolet (FUV) spectra for a large number of cataclysmic variables (CVs). Of the eleven polars,…

A wide range of phenomena, from explosive transients to active galactic nuclei, exhibit variability at radio wavelengths on timescales of a few years. Characterizing the rate and scale of variability in the radio sky can provide keen…

Astrophysics of Galaxies · Physics 2026-05-21 Yjan A. Gordon , Peter S. Ferguson , Michael N. Martinez , Eric J. Hooper

We report the results of a diffraction-limited, photometric variability study of the central 5"x5" of the Galaxy conducted over the past 10 years using speckle imaging techniques on the W. M. Keck I 10 m telescope. Within our limiting…

Astrophysics · Physics 2008-11-26 M. Rafelski , A. M. Ghez , S. D. Hornstein , J. R. Lu , M. Morris

We have used deep V-band and JHKs-band observations to investigate variability and stellar populations near the Galactic plane in Centaurus, and compared the observations with the Galactic model of Besancon. By applying image subtraction…

Astrophysics of Galaxies · Physics 2016-10-12 P. Pietrukowicz , D. Minniti , J. Alonso-Garcia , M. Hempel

Studying the population of faint hard X-ray sources along the plane of the Galaxy is challenging because of high-extinction and crowding, which make the identification of individual sources more difficult. IGR J18293-1213 is part of the…

High Energy Astrophysical Phenomena · Physics 2016-06-15 Maïca Clavel , J. A. Tomsick , A. Bodaghee , J. -L. Chiu , F. M. Fornasini , J. Hong , R. Krivonos , G. Ponti , F. Rahoui , D. Stern

We have used a model of magnetic accretion to investigate the rotational equilibria of magnetic cataclysmic variables (mCVs). The results of our numerical simulations demonstrate that there is a range of parameter space in the P_spin /…

Astrophysics · Physics 2009-11-10 A. J. Norton , G. A. Wynn , R. V. Somerscales

This paper introduces a new Planck Catalog of Polarized and Variable Compact Sources (PCCS-PV) comprising 153 sources, the majority of which are extragalactic. The data include both the total flux density and linear polarization measured by…

Cosmology and Nongalactic Astrophysics · Physics 2023-01-18 G. Rocha , R. Keskitalo , B. Partridge , A. Marscher , C. O'Dea , T. J. Pearson , K. M. Górski

Previous studies suggest that the Galactic diffuse X-ray emission is composed of unresolved point sources, primarily mCVs. However, nearby mCVs have a much lower 6.7 keV line equivalent width ($\rm EW_{6.7}$) compared to the diffuse X-ray…

High Energy Astrophysical Phenomena · Physics 2025-06-16 Samaresh Mondal , Gabriele Ponti , Tong Bao , Mark R. Morris , Frank Haberl , Nanda Rea , Sergio Campana

Discoveries of two new white dwarf plus M star binaries with striking optical cyclotron emission features from the Sloan Digital Sky Survey (SDSS) brings to six the total number of X-ray faint, magnetic accretion binaries that accrete at…

We investigate here populations of cataclysmic variables (CVs) in a set of 288 globular cluster (GC) models evolved with the MOCCA code. This is by far the largest sample of GC models ever analysed with respect to CVs. Contrary to what has…

Astrophysics of Galaxies · Physics 2018-12-12 Diogo Belloni , Mirek Giersz , Liliana E. Rivera Sandoval , Abbas Askar , Paweł Ciecieląg

For purposes of designing targeted cataclysmic variable (CV) detection surveys and interpreting results of other projects with many CV detections such as the ChaMPlane Survey, we have created a model of the CV distribution in the Galaxy. It…

Astrophysics · Physics 2009-11-13 A. B. Rogel , H. N. Cohn , P. M. Lugger

The ESA gamma-ray telescope, INTEGRAL, is detecting relatively more intrinsically rare cataclysmic variables (CVs) than were found by surveys at lower energies. Specifically, a large fraction of the CVs that are INTEGRAL sources consists of…

Solar and Stellar Astrophysics · Physics 2009-11-13 Magaretha L. Pretorius

The INTEGRAL and Swift hard X-ray surveys have identified a large number of new sources, among which many are proposed as Cataclysmic Variables (CVs). Here we present the first detailed study of three X-ray selected CVs, Swift J1907.3-2050,…

As a result of applying the original optical variability search method on publicly available data, we have found eight new cataclysmic variables and two possible Optically Violent Variable quasars among the previously unidentified X-ray…

Solar and Stellar Astrophysics · Physics 2015-05-19 D. V. Denisenko , K. V. Sokolovsky

Intraday variability (IDV) of the radio emission from active galactic nuclei is now known to be predominantly due to interstellar scintillation (ISS). The MASIV (The Micro-Arcsecond Scintillation-Induced Variability) survey of 443 flat…

SDSS-V is carrying out a dedicated survey for white dwarfs, single and in binaries, and we report the analysis of the spectroscopy of cataclysmic variables (CVs) and CV candidates obtained during the final plug plate observations of SDSS.…

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