Articles by Stephen E. Zepf

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Stephen E. Zepf

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Spectral Insights and Evolutionary Pathways of Globular Cluster ULX in NGC 1399: A Two-Decade X-ray and Optical Study

30 January 2025 by Kwangmin Oh and others

High Energy Astrophysical Phenomena

An Extreme Ultra-Compact X-ray Binary in a Globular Cluster: Multi-Wavelength Observations of RZ2109 Explored in a Triple System Framework

14 March 2024 by Kristen Dage and others

High Energy Astrophysical Phenomena

Is the M81 Fast Radio Burst Host Globular Cluster Special?

16 October 2023 by Kristen Dage and others at

Wayne State University

High Energy Astrophysical Phenomena, Astrophysics of Galaxies

The X-ray Point Source Population Hosted by Globular Clusters in the Elliptical Galaxy NGC 4261

21 June 2023 by Sneha Nair and others

High Energy Astrophysical Phenomena, Astrophysics of Galaxies

Optical and X-ray Follow-Up to a Globular Cluster Ultraluminous X-ray Source in NGC 4472

28 October 2022 by Wasundara Athukoralalage and others

High Energy Astrophysical Phenomena

Far Ultra-Violet Insights Into NGC 1399's Globular Cluster Population

26 October 2022 by Kristen Dage and others

Astrophysics of Galaxies, High Energy Astrophysical Phenomena

Using Machine Learning to Identify Extragalactic Globular Cluster Candidates from Ground-Based Photometric Surveys of M87

19 May 2022 by Emilia Barbisan and others

Astrophysics of Galaxies

Ultraluminous X-ray Sources in Seven Edge-On Spiral Galaxies

29 September 2021 by Kristen Dage and others

High Energy Astrophysical Phenomena

Three Ultraluminous X-ray Sources Hosted by Globular Clusters in NGC 1316

30 March 2021 by Kristen Dage and others

High Energy Astrophysical Phenomena

X-Ray Spectroscopy of Newly Identified ULXs Associated With M87's Globular Cluster Population

1 July 2020 by Kristen Dage and others

High Energy Astrophysical Phenomena

Slow Decline and Rise of the Broad [OIII] Emission Line in Globular Cluster Black Hole Candidate RZ2109

6 September 2019 by Kristen Dage and others

High Energy Astrophysical Phenomena

Discovery of a transient ultraluminous X-ray source in the elliptical galaxy M86

3 March 2019 by Lennart M. Van Haaften and others

High Energy Astrophysical Phenomena, Astrophysics of Galaxies

X-Ray Spectral Variability of Ultraluminous X-Ray Sources in Extragalactic Globular Clusters

26 February 2019 by Kristen Dage and others

High Energy Astrophysical Phenomena

X-ray Variability from the Ultraluminous Black Hole Candidate X-ray Binary in the Globular Cluster RZ 2109

5 June 2018 by Kristen Dage and others

High Energy Astrophysical Phenomena

An excess of low-mass X-ray binaries in the outer halo of NGC 4472

15 November 2017 by Lennart M. Van Haaften and others

High Energy Astrophysical Phenomena, Astrophysics of Galaxies

Further constraints on variations in the IMF from LMXB populations

2 May 2017 by Mark Peacock and others

Astrophysics of Galaxies

Deep Chandra observations of NGC~7457, the X-ray point source populations of a low mass early-type galaxy

2 January 2017 by Mark Peacock and others

High Energy Astrophysical Phenomena, Astrophysics of Galaxies

Globular clusters in the far-ultraviolet: evidence for He-enriched second populations in extra-galactic globular clusters?

15 September 2016 by Mark Peacock and others

Astrophysics of Galaxies

The X-ray luminosity function of low mass X-ray binaries in early-type galaxies, their metal-rich, and metal-poor globular clusters

18 December 2015 by Mark Peacock and Stephen Zepf

High Energy Astrophysical Phenomena, Astrophysics of Galaxies

A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system

25 March 2015 by Vincenzo Pota and others

Astrophysics of Galaxies

Kinematical fingerprints of star cluster early dynamical evolution

13 June 2014 by Enrico Vesperini and others

Astrophysics of Galaxies

The Luminosity Function of Low Mass X-Ray Binaries in the Globular Cluster System of NGC 1399

3 May 2014 by Giuseppe D'ago and others

High Energy Astrophysical Phenomena

Beyond the Brim of the Hat: Kinematics of Globular Clusters out to Large Radius in the Sombrero Galaxy

27 March 2014 by Jessica Dowell and others

Astrophysics of Galaxies

Composition of an Emission Line System in Black Hole Host Globular Cluster RZ2109

12 March 2014 by Matthew Steele and others

Astrophysics of Galaxies

Evidence for a constant IMF in early-type galaxies based on their X-ray binary populations

3 February 2014 by Mark Peacock and others

Astrophysics of Galaxies

Signatures of multiple stellar populations in unresolved extragalactic globular/ young massive star clusters

1 April 2013 by Mark Peacock and others

Astrophysics of Galaxies, Cosmology and Nongalactic Astrophysics

Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole

27 September 2012 by Mark Peacock and others

Astrophysics of Galaxies, High Energy Astrophysical Phenomena

Limits on [OIII] 5007 emission from NGC4472's globular clusters: constraints on planetary nebulae and ultraluminous black hole X-ray binaries in globular clusters

26 April 2012 by Mark Peacock and others

Cosmology and Nongalactic Astrophysics

The Globular Cluster Kinematics and Galaxy Dark Matter Content of NGC 3923

4 January 2012 by Mark Norris and others

Astrophysics of Galaxies

Velocity Structure and Variability of [O III] Emission in Black Hole Host Globular Cluster RZ2109

20 July 2011 by Matthew Steele and others

Astrophysics of Galaxies

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High Energy Astrophysical Phenomena Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Solar and Stellar Astrophysics General Relativity and Quantum Cosmology