ACDS V10.0 - Thu Apr 18 11:22:42 CEST 2019
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Detailed Description of II/327 :
AKARI Far-Infrared Surveyor YSO catalog (Toth+, 2014)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
II/327 AKARI Far-Infrared Surveyor YSO catalog (Toth+, 2014)
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The AKARI Far-Infrared Surveyor young stellar object catalog.
Toth L.V., Marton G., Zahorecz S., Balazs L.G., Ueno M., Tamura M.,
Kawamura A., Kiss Z.T., Kitamura Y.
<Publ. Astron. Soc. Jap., 66, 17 (2014)>
=2014PASJ...66...17T
=2014yCat.2327....0T
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ADC_Keywords: Protostars ; Stars, pre-main sequence ; Stellar distribution ;
Fundamental catalog
Keywords: catalogs - infrared: ISM - infrared: stars - ISM: bubbles -
stars: formation
Abstract:
We demonstrate the use of the AKARI all-sky survey photometric data in
the study of galactic star formation. Our aim was to select young
stellar objects (YSOs) in the AKARI Far-Infrared Surveyor (FIS) Bright
Source Catalogue. We used AKARI/FIS and Wide-field Infrared Survey
Explorer (WISE) data to derive mid- and far-infrared colors of YSOs.
Classification schemes based on quadratic discriminant analysis (QDA)
have been given for YSOs and the training catalog for QDA was the
whole-sky selection of previously known YSOs (i.e., listed in the
SIMBAD database). A new catalog of AKARI FIS YSO candidates including
44001 sources has been prepared; the reliability of the classification
is over 90%, as tested in comparison to known YSOs. As much as 76% of
our YSO candidates are from previously uncatalogued types. The vast
majority of these sources are Class I and II types according to the
Lada classification. The distribution of AKARI FIS YSOs is well
correlated with that of the galactic ISM; local over-densities were
found on infrared loops and towards the cold clumps detected by
Planck.
Description:
AKARI FSC BSC data was combined with mid-IR photometric data from the
WISE All-Sky Data Release. Classification was made with quadratic
discriminant analysis based on the mid- and far-IR colours and
brightness values. 44001 sources were classified as young stellar
object candidate. For each candidate AKARI FIS ID, celestial position
(RA2000, DEC2000), WISE magnitudes measured in passbands centered at
3.4, 4.6, 12 and 22um (W1, W2, W3, W4), their corresponding errors
(e_W1, e_W2, e_W3, e_W4), FIS flux densities measured in passbands
with nominal wavelengths of 65, 90, 140 and 160um (F65, F90, F140,
F160) and the corresponding flux qualities (F_QUAL), the probability
of being YSO, SIMBAD main type and subtypes, the angular distance
between the FIS source and the matching SIMBAD object and the SIMBAD
ID of the matching object are listed.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× ysoc.dat 232 44001 Parameters of sources classified as YSO candidate
See also:
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
II/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
Byte-by-byte Description of file: ysoc.dat
Bytes Format Units Label Explanations
1- 14 A14 --- AKARI ID number from the AKARI FIS BSC (Cat. II/298)
(objName, HHMMSSs+DDMMSS)
16- 25 F10.6 deg RAdeg Right ascension (J2000.0)
27- 36 F10.6 deg DEdeg Declination (J2000.0)
38- 43 F6.3 mag W1 WISE W1 magnitude
45- 49 F5.3 mag e_W1 Error of W1 magnitude
51- 56 F6.3 mag W2 WISE W2 magnitude
58- 62 F5.3 mag e_W2 Error of W2 magnitude
64- 69 F6.3 mag W3 WISE W3 magnitude
71- 75 F5.3 mag e_W3 Error of W3 magnitude
77- 82 F6.3 mag W4 WISE W4 magnitude
84- 88 F5.3 mag e_W4 Error of W4 magnitude
90-100 F11.6 Jy F65 AKARI N60 flux density (65um)
102-112 F11.6 Jy F90 AKARI WIDE-S flux density (90um)
114-124 F11.6 Jy F140 AKARI WIDE-L flux density (140um)
126-137 F12.6 Jy F160 AKARI N160 flux density (160um)
139 I1 --- q_F65 [1/3] 65um flux quality value (3=high quality)
141 I1 --- q_F90 [3] 90um flux quality value (3=high quality)
143 I1 --- q_F140 [3] 140um flux quality value (3=high quality)
145 I1 --- q_F160 [1/3] 160um flux quality value (3=high quality)
147-154 F8.6 --- Prob [0.5/1] Probability of being a YSO candidate
156-158 A3 --- Type Main Type of the source as listed in SIMBAD (1)
160-189 A30 --- Subtypes Subtypes of the source as listed in SIMBAD
191-196 F6.3 arcsec Dist [0.1/30]?=0 Angular distance between the FIS
source and the matching SIMBAD object
198-232 A35 --- SIMBAD SIMBAD ID of the matching SIMBAD object
Note (1): The classification was done in late 2012, the paper was submitted in
early 2013, while the preparation of the final form of the catalog was
made in mid 2013. Meanwhile 4 of our YSO candidate sources were classified
as galaxy in the SIMBAD which we did not remove. But in this catalog they
are already listed as galaxy in the Main Type column.
Acknowledgements:
Gabor Marton , marton.gabor(at)csfk.mta.hu
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(End) Gabor Marton [Konkoly, Hungary], Patricia Vannier [CDS] 03-Jan-2014