GW
G. Witzel
astro-ph.GAastro-ph.HEastro-ph.IMastro-ph.SRastro-phastro-ph.EPgr-qcaccretionaccretion disksastro-ph.CO
On Valency
published · living versionsW_nfz7nj75·v1 · currentpublished
Keck Observations of the Galactic Center Source G2: Gas Cloud or Star?
with K. Phifer, T. Do, L. Meyer, A. M. Ghez +6
1 version
W_2zvbj8fk·v1published
Preprints & journals
63 papers in the corpus · 2008–2026Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign2604.10287v1 · Ezequiel Albentosa-Ruiz, Jasmin E. Washington, Nicola Marchili et al.2026 · 1 citationAstronomy & Astrophysics 708 (2026) A179
Probabilistic Interpolation of Sagittarius A*'s Multi-Wavelength Light Curves Using Diffusion Models2601.20863v1 · Gabriel Sasseville, Julie Hlavacek-Larrondo, Daryl Haggard et al.2026 · 0 citationsarXiv
Locating the missing large-scale emission in the jet of M87* with short EHT baselines2601.13356v1 · Boris Georgiev, Paul Tiede, Sebastiano D. von Fellenberg et al.2026 · 1 citationA&A 709, A26 (2026)
Mid-infrared extinction toward the Galactic center2511.14850v1 · Sebastiano D. von Fellenberg, Joseph M. Michail, S.P. Willner et al.2025 · 4 citationsarXiv
Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre2511.14856v1 · Tamojeet Roychowdhury, Sebastiano D. von Fellenberg, Joseph M. Michail et al.2025 · 1 citationPublications of the Astronomical Society of the Pacific 2025, Volume 137, Number 11
Origin of the ring ellipticity in the black hole images of M87*2505.10333v1 · Rohan Dahale, Ilje Cho, Kotaro Moriyama et al.2025 · 4 citationsA&A 699, A279 (2025)
The putative center in NGC 10522501.08685v1 · Anne-Kathrin Baczko, Matthias Kadler, Eduardo Ros et al.2025 · 10 citationsA&A, 692, A205 (2024)
First mid-infrared detection and modeling of a flare from Sgr A*2501.07415v1 · Sebastiano D. von Fellenberg, Tamojeet Roychowdhury, Joseph M. Michail et al.2025 · 21 citationsarXiv
A multi-frequency study of sub-parsec jets with the Event Horizon Telescope2501.05518v1 · Jan Roder, Maciek Wielgus, Andrei P. Lobanov et al.2025 · 13 citationsA&A 695, A233 (2025)
Sun-related variability in the light curves of compact radio sources. A new view on Extreme Scattering Events2412.05373v1 · Nicola Marchili, Gunther Witzel, Margo F. Aller2024 · 2 citationsA&A 694, A96 (2025)
New Evidence for a Flux-independent Spectral Index of Sgr A* in the Near-infrared2411.11966v1 · Hadrien Paugnat, Tuan Do, Abhimat K. Gautam et al.2024 · 7 citationsarXiv
First Very Long Baseline Interferometry Detections at 870{\mu}m2410.07453v1 · Alexander W. Raymond, Sheperd S. Doeleman, Keiichi Asada et al.2024 · 33 citationsThe Astronomical Journal, Volume 168, Issue 3, id.130, 19 pp. 2024
General Relativistic effects and the NIR variability of Sgr A* II: A systematic approach to temporal asymmetry2407.07091v1 · Sebastiano D. von Fellenberg, Gunther Witzel, Michi Bauboeck et al.2024 · 8 citationsA&A 688, L12 (2024)
Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode2404.17623v3 · J. C. Algaba, M. Balokovic, S. Chandra et al.2024 · 35 citationsA&A 692, A140 (2024)
Ordered magnetic fields around the 3C 84 central black hole2402.00927v1 · G. F. Paraschos, J.-Y. Kim, M. Wielgus et al.2024 · 27 citationsIssue: A&A Volume 682, February 2024; Article number: L3; Number of pages: 15
A Collection of German Science Interests in the Next Generation Very Large Array2311.10056v2 · M. Kadler, D. A. Riechers, J. Agarwal et al.2023 · 0 citationsarXiv
The JWST Galactic Center Survey -- A White Paper2310.11912v8 · Rainer Schoedel, Steve Longmore, Jonny Henshaw et al.2023 · 6 citationsarXiv
A search for pulsars around Sgr A* in the first Event Horizon Telescope dataset2308.15381v1 · Pablo Torne, Kuo Liu, Ralph P. Eatough et al.2023 · 15 citationsarXiv
Near-Infrared Flux Distribution of Sgr A* from 2005-2022: Evidence for an Enhanced Accretion Episode in 20192308.09749v1 · Grant C. Weldon, Tuan Do, Gunther Witzel et al.2023 · 13 citationsarXiv
Comparison of Polarized Radiative Transfer Codes used by the EHT Collaboration2303.12004v2 · Cora Prather, Jason Dexter, Monika Moscibrodzka et al.2023 · 24 citationsApJ, 950, 35, 2023
General relativistic effects and the near-infrared and X-ray variability of Sgr A* I2301.02558v1 · Sebastiano D. von Fellenberg, Gunther Witzel, Michi Baubock et al.2023 · 21 citationsarXiv
AIROPA II: Modeling Instrumental Aberrations for Off-Axis Point Spread Functions in Adaptive Optics2210.10940v1 · Anna Ciurlo, Paolo Turri, Gunther Witzel et al.2022 · 4 citationsJournal of Astronomical Telescopes, Instruments, and Systems, Vol. 8, Issue 3, 038007 (September 2022)
A multiband study and exploration of the radio wave - -ray connection in 3C 842210.09795v1 · G. F. Paraschos, V. Mpisketzis, J.-Y. Kim et al.2022 · 26 citationsA&A 669, A32 (2023)
AIROPA IV: Validating Point Spread Function Reconstruction on Various Science Cases2209.05489v1 · Sean K. Terry, Jessica R. Lu, Paolo Turri et al.2022 · 9 citationsarXiv
AIROPA III: Testing Simulated and On-Sky Data2207.00548v1 · Paolo Turri, Jessica R. Lu, Gunther Witzel et al.2022 · 4 citationsarXiv
Multi-wavelength Variability of Sagittarius A* in July 20192203.13311v1 · H. Boyce, D. Haggard, G. Witzel et al.2022 · 20 citationsarXiv
Flaremodel: An open-source Python package for one-zone numerical modelling of synchrotron sources2111.15273v1 · Y. Dallilar, S. von Fellenberg, M. Baubock et al.2021 · 5 citationsA&A 658, A111 (2022)
Constraining particle acceleration in Sgr A* with simultaneous GRAVITY, Spitzer, NuSTAR and Chandra observations2107.01096v1 · R. Abuter, A. Amorim, M. Baubock et al.2021 · 67 citationsA&A 654, A22 (2021)
Rapid Variability of Sgr A* across the Electromagnetic Spectrum2011.09582v2 · G. Witzel, G. Martinez, S. P. Willner et al.2020 · 79 citationsarXiv
General relativistic MHD simulations of non-thermal flaring in Sagittarius A*2011.08904v2 · Koushik Chatterjee, Sera Markoff, Joseph Neilsen et al.2020 · 59 citationsarXiv
Kinematic Structure of the Galactic Center S-cluster2006.11399v1 · Basel Ali, Daria Paul, Andreas Eckart et al.2020 · 55 citationsarXiv
Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares.32801381 · Fazio, G G, Hora, J L, Witzel, G et al.2025 · 34 citationsThe Astrophysical journal. 2019;864(1)
Envisioning the next decade of Galactic Center science: a laboratory for the study of the physics and astrophysics of supermassive black holes1903.05293v1 · Tuan Do (UCLA), Andrea Ghez (UCLA), Jessica R. Lu et al.2019 · 10 citationsarXiv
The Galactic Center: An Improved Astrometric Reference Frame for Stellar Orbits around the Supermassive Black Hole1901.08685v1 · Shoko Sakai, Jessica R. Lu, Andrea Ghez et al.2019 · 34 citationsarXiv
An Adaptive Optics Survey of Stellar Variability at the Galactic Center1811.04898v1 · Abhimat Krishna Gautam., Tuan Do, Andrea M. Ghez et al.2018 · 32 citationsThe Astrophysical Journal, 871:103 (32pp), 2019 January 20
Improving Orbit Estimates for Incomplete Orbits with a New Approach to Priors -- with Applications from Black Holes to Planets1809.05490v2 · K. Kosmo O'Neil, G. D. Martinez, A. Hees (1 et al.2018 · 36 citationsAJ, 158, 4 (2019)
Off-axis point spread function characterisation in laser-guide star adaptive optics systems1804.05198v1 · O. Beltramo-Martin, C.M. Correia, E. Mieda et al.2018 · 1 citationarXiv
Confusing binaries: the role of stellar binaries in biasing disk properties in the Galactic Center1801.03934v1 · Smadar Naoz, Andrea M. Ghez, Aurelien Hees et al.2018 · 39 citationsarXiv
Investigating the Binarity of S0-2: Implications for its Origins and Robustness as a Probe of the Laws of Gravity around a Supermassive Black Hole1709.04890v2 · Devin S. Chu, Tuan Do, Aurelien Hees et al.2017 · 68 citationsarXiv
Testing General Relativity with Stellar Orbits around the Supermassive Black Hole in Our Galactic Center.28598651 · Hees, A, Do, T, Ghez, A M et al.2018 · 265 citationsPhysical review letters. 2017;118(21):211101
An Improved Distance and Mass Estimate for Sgr A* from a Multistar Orbit Analysis1607.05726v1 · A. Boehle, A. M. Ghez, R. Schodel et al.2016 · 351 citationsarXiv
Using infrared/X-ray flare statistics to probe the emission regions near the event horizon of Sgr A*1606.06567v1 · Salome Dibi, Sera Markoff, Renaud Belmont et al.2016 · 23 citationsarXiv
Merging Binaries in the Galactic Center: The eccentric Kozai-Lidov mechanism with stellar evolution1603.02709v2 · Alexander P. Stephan, Smadar Naoz, Andrea M. Ghez et al.2016 · 191 citationsarXiv
The X-ray Flux Distribution of Sagittarius A* as Seen by Chandra1412.3106v1 · J. Neilsen, S. Markoff, M. A. Nowak et al.2014 · 64 citationsarXiv
Polarized light from Sgr A* in the near-infrared -band1411.0006v1 · B. Shahzamanian, A. Eckart, M. Valencia-S. et al.2014 · 48 citationsA&A 576, A20 (2015)
Detection of Galactic Center source G2 at 3.8 m during periapse passage1410.1884v2 · Gunther Witzel, Andrea M. Ghez, Mark R. Morris et al.2014 · 108 citationsarXiv
The Intrinsic Two-Dimensional Size of Sagittarius A*1405.1456v1 · Geoffrey C. Bower, Sera Markoff, Andreas Brunthaler et al.2014 · 57 citationsarXiv
The Keplerian orbit of G21312.1715v1 · L. Meyer, A. M. Ghez, G. Witzel et al.2013 · 9 citationsarXiv
Keck Observations of the Galactic Center Source G2: Gas Cloud or Star?1304.5280v2 · K. Phifer, T. Do, L. Meyer et al.2013 · 98 citationsarXivon Valency
Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements1208.5836v1 · G. Witzel, A. Eckart, M. Bremer et al.2012 · 115 citationsarXivon Valency
Career total: at least 180 works. 63 are in this corpus.Showing the 50 most recent.
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