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  1. Book ; Online: The weird and the wonderful in our Solar System

    Rogers, Brian / Lintott, Chris J. / Croft, Steve / Schwamb, Megan E. / Davenport, James R. A.

    Searching for serendipity in the Legacy Survey of Space and Time

    2024  

    Abstract: We present a novel method for anomaly detection in Solar System object data, in preparation for the Legacy Survey of Space and Time. We train a deep autoencoder for anomaly detection and use the learned latent space to search for other interesting ... ...

    Abstract We present a novel method for anomaly detection in Solar System object data, in preparation for the Legacy Survey of Space and Time. We train a deep autoencoder for anomaly detection and use the learned latent space to search for other interesting objects. We demonstrate the efficacy of the autoencoder approach by finding interesting examples, such as interstellar objects, and show that using the autoencoder, further examples of interesting classes can be found. We also investigate the limits of classic unsupervised approaches to anomaly detection through the generation of synthetic anomalies and evaluate the feasibility of using a supervised learning approach. Future work should consider expanding the feature space to increase the variety of anomalies that can be uncovered during the survey using an autoencoder.

    Comment: Accepted by AJ
    Keywords Astrophysics - Earth and Planetary Astrophysics ; Astrophysics - Instrumentation and Methods for Astrophysics ; Computer Science - Machine Learning
    Publishing date 2024-01-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Solar System: Stranded in no-man's-land.

    Schwamb, Megan E

    Nature

    2014  Volume 507, Issue 7493, Page(s) 435–436

    Language English
    Publishing date 2014-03-26
    Publishing country England
    Document type Comment ; Journal Article
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/507435a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  3. Article ; Online: Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni.

    Kimura, Mariko / Isogai, Keisuke / Kato, Taichi / Ueda, Yoshihiro / Nakahira, Satoshi / Shidatsu, Megumi / Enoto, Teruaki / Hori, Takafumi / Nogami, Daisaku / Littlefield, Colin / Ishioka, Ryoko / Chen, Ying-Tung / King, Sun-Kun / Wen, Chih-Yi / Wang, Shiang-Yu / Lehner, Matthew J / Schwamb, Megan E / Wang, Jen-Hung / Zhang, Zhi-Wei /
    Alcock, Charles / Axelrod, Tim / Bianco, Federica B / Byun, Yong-Ik / Chen, Wen-Ping / Cook, Kem H / Kim, Dae-Won / Lee, Typhoon / Marshall, Stuart L / Pavlenko, Elena P / Antonyuk, Oksana I / Antonyuk, Kirill A / Pit, Nikolai V / Sosnovskij, Aleksei A / Babina, Julia V / Baklanov, Aleksei V / Pozanenko, Alexei S / Mazaeva, Elena D / Schmalz, Sergei E / Reva, Inna V / Belan, Sergei P / Inasaridze, Raguli Ya / Tungalag, Namkhai / Volnova, Alina A / Molotov, Igor E / de Miguel, Enrique / Kasai, Kiyoshi / Stein, William L / Dubovsky, Pavol A / Kiyota, Seiichiro / Miller, Ian / Richmond, Michael / Goff, William / Andreev, Maksim V / Takahashi, Hiromitsu / Kojiguchi, Naoto / Sugiura, Yuki / Takeda, Nao / Yamada, Eiji / Matsumoto, Katsura / James, Nick / Pickard, Roger D / Tordai, Tamás / Maeda, Yutaka / Ruiz, Javier / Miyashita, Atsushi / Cook, Lewis M / Imada, Akira / Uemura, Makoto

    Nature

    2016  Volume 529, Issue 7584, Page(s) 54–58

    Abstract: How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. ... ...

    Abstract How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed to occur in the inner disk, causing repetitive patterns of large-amplitude X-ray variability (oscillations) on timescales of minutes to hours. In fact, such oscillations have been observed only in sources with a high mass-accretion rate, such as GRS 1915+105 (refs 2, 3). These large-amplitude, relatively slow timescale, phenomena are thought to have physical origins distinct from those of X-ray or optical variations with small amplitudes and fast timescales (less than about 10 seconds) often observed in other black-hole binaries-for example, XTE J1118+480 (ref. 4) and GX 339-4 (ref. 5). Here we report an extensive multi-colour optical photometric data set of V404 Cygni, an X-ray transient source containing a black hole of nine solar masses (and a companion star) at a distance of 2.4 kiloparsecs (ref. 8). Our data show that optical oscillations on timescales of 100 seconds to 2.5 hours can occur at mass-accretion rates more than ten times lower than previously thought. This suggests that the accretion rate is not the critical parameter for inducing inner-disk instabilities. Instead, we propose that a long orbital period is a key condition for these large-amplitude oscillations, because the outer part of the large disk in binaries with long orbital periods will have surface densities too low to maintain sustained mass accretion to the inner part of the disk. The lack of sustained accretion--not the actual rate--would then be the critical factor causing large-amplitude oscillations in long-period systems.
    Language English
    Publishing date 2016-01-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature16452
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MG 9: Show issues
    Zs.MO 244: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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