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Related papers: Via Machinae 3.0: A search for stellar streams in …

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We develop a new machine learning algorithm, Via Machinae, to identify cold stellar streams in data from the Gaia telescope. Via Machinae is based on ANODE, a general method that uses conditional density estimation and sideband…

Astrophysics of Galaxies · Physics 2021-12-30 David Shih , Matthew R. Buckley , Lina Necib , John Tamanas

We present an update to Via Machinae, an automated stellar stream-finding algorithm based on the deep learning anomaly detector ANODE. Via Machinae identifies stellar streams within Gaia, using only angular positions, proper motions, and…

Astrophysics of Galaxies · Physics 2023-03-06 David Shih , Matthew R. Buckley , Lina Necib

The Gaia astrometric mission may offer an unprecedented opportunity to discover new tidal streams in the Galactic halo. To test this, we apply nGC3, a great-circle-cell count method that combines position and proper motion data to identify…

Astrophysics of Galaxies · Physics 2017-07-19 Cecilia Mateu , Andrew Cooper , Andreea S. Font , Luis Aguilar , Carlos Frenk , Shaun Cole , Wenting Wang , Ian G. McCarthy

The Gaia mission has led to the discovery of over 100 stellar streams in the Milky Way, most of which likely originated from globular clusters (GCs). As the upcoming wide-field surveys can potentially continue to increase the number of…

Astrophysics of Galaxies · Physics 2025-12-12 Yingtian Chen , Oleg Y. Gnedin , Adrian M. Price-Whelan , Colin Holm-Hansen

We present maps of the stellar streams detected in the Gaia Data Release 2 (DR2) and Early Data Release 3 (EDR3) catalogs using the STREAMFINDER algorithm. We also report the spectroscopic follow-up of the brighter DR2 stream members…

We have designed a powerful new algorithm to detect stellar streams in an automated and systematic way. The algorithm, which we call the STREAMFINDER, is well suited for finding dynamically cold and thin stream structures that may lie along…

Astrophysics of Galaxies · Physics 2018-05-09 Khyati Malhan , Rodrigo Ibata

We present an atlas and follow-up spectroscopic observations of 87 thin stream-like structures detected with the STREAMFINDER algorithm in Gaia DR3, of which 29 are new discoveries. Here we focus on using these streams to refine mass models…

We apply the automatic stellar stream detection algorithm StarStream to Gaia Data Release 3 and identify 87 stellar streams associated with Galactic globular clusters (GCs), including 34 high-quality cases with median completeness and…

Astrophysics of Galaxies · Physics 2026-03-02 Yingtian Chen , Oleg Y. Gnedin , Adrian M. Price-Whelan

Large-scale astrophysics datasets present an opportunity for new machine learning techniques to identify regions of interest that might otherwise be overlooked by traditional searches. To this end, we use Classification Without Labels…

Astrophysics of Galaxies · Physics 2024-12-11 Mariel Pettee , Sowmya Thanvantri , Benjamin Nachman , David Shih , Matthew R. Buckley , Jack H. Collins

We propose an extension of the GC3 streamer finding method of Johnston et al. 1996 that can be applied to the future Gaia database. The original method looks for streamers along great circles in the sky, our extension adds the kinematical…

We present SkyCURTAINs, a data driven and model agnostic method to search for stellar streams in the Milky Way galaxy using data from the Gaia telescope. SkyCURTAINs is a weakly supervised machine learning algorithm that builds a background…

Astrophysics of Galaxies · Physics 2024-05-22 Debajyoti Sengupta , Stephen Mulligan , David Shih , John Andrew Raine , Tobias Golling

Thanks to the precise astrometric measurements of proper motions by the Gaia mission, a new tidal stellar stream has been discovered in the northern hemisphere. The distribution of star count shows that the stream is approximately $80$…

Astrophysics of Galaxies · Physics 2024-04-09 Hao Tian , Chao Liu , Changqing Luo , Xiang-Xiang Xue , Yujiao Yang

STREAMFINDER is a new algorithm that we have built to detect stellar streams in an automated and systematic way in astrophysical datasets that possess any combination of positional and kinematic information. In Paper I, we introduced the…

Astrophysics of Galaxies · Physics 2018-06-06 Khyati Malhan , Rodrigo A. Ibata , Bertrand Goldman , Nicolas F. Martin , Eugene Magnier , Kenneth Chambers

The $\Lambda$CDM cosmological scenario predicts that our Galaxy should contain hundreds of stellar streams at the solar vicinity, fossil relics of the merging history of the Milky Way and more generally of the hierarchical growth of…

Astrophysics of Galaxies · Physics 2017-08-23 I. Jean-Baptiste , P. Di Matteo , M. Haywood , A. Gomez , M. Montuori , F. Combes , B. Semelin

Anomaly detection is critical for finding suspicious behavior in innumerable systems. We need to detect anomalies in real-time, i.e. determine if an incoming entity is anomalous or not, as soon as we receive it, to minimize the effects of…

Machine Learning · Computer Science 2023-01-31 Siddharth Bhatia

We present a panoramic map of the stellar streams of the Milky Way based upon astrometric and photometric measurements from the Gaia DR2 catalogue. In this first contribution, we concentrate on the halo at heliocentric distances beyond 5…

Astrophysics of Galaxies · Physics 2018-09-19 Khyati Malhan , Rodrigo A. Ibata , Nicolas F. Martin

Precision cosmology with Type Ia supernovae (SNe Ia) requires robust quality control of large, heterogeneous datasets. Current data processing often relies on manual, subjective rejection of photometric data, a practice that is not scalable…

Instrumentation and Methods for Astrophysics · Physics 2025-09-18 S. A. K. Leeney , W. J. Handley , H. T. J. Bevins , E. de Lera Acedo

The hierarchical model of galaxy formation predicts that the Milky Way halo is populated by tidal debris of dwarf galaxies and globular clusters. Due to long dynamical times, debris from the lowest mass objects remains coherent as thin and…

Astrophysics of Galaxies · Physics 2024-05-31 Ana Bonaca , Adrian M. Price-Whelan

We present the discovery of a large population of stellar streams that surround the inner Galaxy, found in the Gaia DR2 catalog using the new STREAMFINDER algorithm. Here we focus on the properties of eight new high-significance structures…

Astrophysics of Galaxies · Physics 2019-02-27 Rodrigo Ibata , Khyati Malhan , Nicolas Martin

Context. In the current ever increasing data volumes of astronomical surveys, automated methods are essential. Objects of known classes from the literature are necessary for training supervised machine learning algorithms, as well as for…

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