Identification of Artifacts and Interesting Celestial Objects in the LAMOST Spectral Survey

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00520575" target="_blank" >RIV/67985815:_____/19:00520575 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Identification of Artifacts and Interesting Celestial Objects in the LAMOST Spectral Survey
Original language description
The LAMOST DR1 survey contains about two million spectra labelled by its pipeline as stellar objects of common spectral classes. There are, however, a lot of spectra corrupted in some way by both instrumental and processing artifacts, which may mimic spectral properties of interesting celestial objects, namely emission lines of Be stars and quasars. We have tested several clustering methods as well as outlier analysis on a sample of one hundred thousand spectra using Spark scripts running on a Hadoop cluster consisting of twenty-four sixteen-core nodes. This experiment was motivated by an attempt to find rare objects with interesting spectra as outliers most dissimilar from all common spectra. The result of this time-consuming procedure is a list of several hundred candidates where different artifacts are prominent, but also tens of very interesting emission-line spectra requiring further detailed examination. Many of them may be quasars or even blazars as well as yet unknown Be-stars. It deserves mentioning that most of the work benefitted considerably from technologies of the Virtual Observatory.
Czech name
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Czech description
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Project
<a href="/en/project/LD15113" target="_blank" >LD15113: Applications of Artificial Intelligence in Astronomy</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Astronomical data analysis software and system XXVI
ISBN
9781583819296
ISSN
1050-3390
e-ISSN
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Number of pages
4
Pages from-to
402-405
Publisher name
Astronomical Society of the Pacific
Place of publication
San Francisco
Event location
Trieste
Event date
Oct 16, 2016
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000495812900097

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