J/MNRAS/443/3528 SDSS peculiar galaxy pairs list (Shamir+, 2014)
Automatic detection and quantitative assessment of peculiar galaxy pairs in
Sloan Digital Sky Survey.
Shamir L., Wallin J.
<Mon. Not. R. Astron. Soc., 443, 3528-3537 (2014)>
=2014MNRAS.443.3528S 2014MNRAS.443.3528S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs
Keywords: catalogues - Galaxy: general - galaxies: interactions -
galaxies: peculiar
Abstract:
We applied computational tools for automatic detection of peculiar
galaxy pairs. We first detected in Sloan Digital Sky Survey DR7
∼400000 galaxy images with i magnitude <18 that had more than one
point spread function, and then applied a machine learning algorithm
that detected ∼26000 galaxy images that had morphology similar to
the morphology of galaxy mergers. That data set was mined using a
novelty detection algorithm, producing a short list of 500 most
peculiar galaxies as quantitatively determined by the algorithm.
Manual examination of these galaxies showed that while most of the
galaxy pairs in the list were not necessarily peculiar, numerous
unusual galaxy pairs were detected. In this paper, we describe the
protocol and computational tools used for the detection of peculiar
mergers, and provide examples of peculiar galaxy pairs that were
detected.
Description:
Autonomous digital sky surveys have been generating vast pipelines of
astronomical images, leading to big astronomical data bases. This form
of astronomical data collection cannot rely solely on manual analysis,
and requires algorithms and computer methods that can process these
data and transform them into smaller and well-defined data sets that
can be effectively used by humans.
Here, we show how an automatic method can mine through a large data
set of ∼3.7x106 galaxy images and reduce them to a list of 500
images, containing many peculiar galaxy mergers.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 147 60 Tabular data on the example galaxies
list.dat 48 500 List used for analysis
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/60] Sequential number
5- 22 A18 --- objID SDSS objID
24- 35 F12.8 deg RAdeg Right ascension (J2000)
37- 48 F12.8 deg DEdeg Declination (J2000)
50- 55 F6.3 --- z ?=- Redshift
57-147 A91 --- Com Descriptions and cross identifications
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/500] Sequential number
5- 22 A18 --- objID SDSS objID
24- 35 F12.8 deg RAdeg Right ascension (J2000)
37- 48 F12.8 deg DEdeg Declination (J2000)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Oct-2018