J/A+A/644/A69 NEWS catalog (Khramtsov+, 2020)
The Northern Extragalactic WISExPan-STARRS (NEWS) catalogue:
Machine-learning identification of 40 million extragalactic objects.
Khramtsov V., Akhmetov V., Fedorov P.
<Astron. Astrophys. 644, A69 (2020)>
=2020A&A...644A..69K 2020A&A...644A..69K (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; QSOs ; Galaxy catalogs ; Photometry ; Positional data
Keywords: methods: data analysis - catalogs - galaxies: statistics -
reference systems
Abstract:
We present a catalogue of candidates in extragalactic objects -- the
Northern Extragalactic WISExPan-STARRS (NEWS), which covers almost 3/4
of the sky in a broad optical-infrared spectral range, with a depth of
up to 23mag in optical filter g. To create the NEWS catalogue, we
used the mid-IR data of the WISE survey (W1,W2) paired up with
photometric information of the Pan-STARRS DR1 survey in the optical
and near-IR (g,r,i,z,y) spectral ranges.
Our catalogue is the result of a classification of the WISExPan-STARRS
objects with the SVM machine-learning algorithm. The classification
was based solely on photometric information and the automatic creation
of features that was carried out using an autoencoder neural network.
NEWS catalogue contains 40,350,492 extragalactic objects (galaxies and
quasars), identified with a high classification quality (>98%).
Description:
The released NEWS catalog includes PS1xAllWISE sources up to g=23mag,
excluding the sources with optical magnitude errors higher than 0.5mag
(in any of five bands) and with a low mid-IR SNR (w1snr<5, w2snr<2).
These sources were classified as extragalactic objects via machine
learning algorithm. In this catalog we present the sources, for which
classification probability of being extragalactic is more than 0.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
news.dat 321 40350492 NEWS catalog
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See also:
II/328 : AllWISE catalog (Cutri+ 2013)
II/349 : Pan-STARRS DR1 catalog (Chambers+, 2016)
I/341 : PMA catalog (Akhmetov+, 2017)
I/345 : Gaia DR2 catalog (Gaia Collaboration, 2018)
J/A+A/632/A56 : KiDS-BEXGO catalog (Khramtsov+, 2019)
Byte-by-byte Description of file: news.dat
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Bytes Format Units Label Explanations
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1- 13 F13.8 deg RAdeg Right ascension (J2000.0)
15- 27 F13.8 deg DEdeg Declination (J2000.0)
30- 32 I3 --- qPS1 PS1 qualityFlag
34- 39 F6.3 mag gmag Mean PSF AB magnitude from g filter
41- 45 F5.3 mag e_gmag Error in gmag
47- 52 F6.3 mag rmag Mean PSF AB magnitude from r filter
54- 58 F5.3 mag e_rmag Error in rmag
60- 65 F6.3 mag imag Mean PSF AB magnitude from i filter
67- 71 F5.3 mag e_imag Error in imag
73- 78 F6.3 mag zmag Mean PSF AB magnitude from z filter
80- 84 F5.3 mag e_zmag Error in zmag
86- 91 F6.3 mag ymag Mean PSF AB magnitude from y filter
93- 97 F5.3 mag e_ymag Error in ymag
99-104 F6.3 mag gKmag ? Mean Kron AB magnitude from g filter
106-110 F5.3 mag e_gKmag ? Error in gKmag
112-117 F6.3 mag W1mag W1 magnitude
119-123 F5.3 mag e_W1mag Error in W1 magnitude
125-129 F5.1 --- W1snr Signal to noise ratio for W1 filter
131-136 F6.3 mag W2mag W2 magnitude
138-142 F5.3 mag e_W2mag Error in W2 magnitude
144-148 F5.1 --- W2snr Signal to noise ratio for W2 filter
149-155 F7.3 mag W3mag ? W3 magnitude
157-162 F6.4 mag e_W3mag ? Error in W3 magnitude
163-168 F6.1 --- W3snr ? Signal to noise ratio for W3 filter
170-175 F6.3 mag W4mag ? W4 magnitude
177-181 F5.3 mag e_W4mag ? Error in W4 magnitude
183-189 F7.1 --- W4snr ? Signal to noise ratio for W4 filter
191-198 F8.5 --- Feature1 First feature from autoencoder
200-207 F8.5 --- Feature2 Second feature from autoencoder
209-216 F8.5 --- Feature3 Third feature from autoencoder
218-225 F8.5 --- Feature4 Fourth feature from autoencoder
227-234 F8.5 --- Feature5 Fifth feature from autoencoder
236-242 F7.5 --- xgalProb [0.5,1] source probability of being an
extragalactic object
244-249 F6.3 mag E(B-V) Colour excess E(B-V) (1)
252-269 A18 --- PS1 PS1 unique source identifier
272-290 A19 --- AllWISE AllWISE unique source identifier
293-320 A28 --- GaiaDR2 ? Gaia DR2 unique source identifier (2)
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Note (1): We used extinction maps presented in
Schlegel et al. (1998ApJ...500...525).
Note (2): Gaia DR2 identifier is available for the subset of sources only.
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Acknowledgements:
Vladislav Khramtsov [IAKNU, Ukraine], vld.khramtsov(at)gmail.com
(End) Vladislav Khramtsov [IAKNU, Ukraine], Patricia Vannier [CDS] 26-Nov-2020