J/MNRAS/503/270 UKIDSS JHK photometry of W33A (Navarete+, 2021)
Principal component analysis tomography in near-infrared integral field
spectroscopy of young stellar objects.
I. Revisiting the high-mass protostar W33A.
Navarete F., Damineli A., Steiner J.E., Blum R.D.
<Mon. Not. R. Astron. Soc. 503, 270-291 (2021)>
=2021MNRAS.503..270N 2021MNRAS.503..270N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Photometry, infrared
Keywords: methods: statistical - techniques: imaging spectroscopy -
stars: pre-main sequence - stars: protostars -
ISM: individual objects: W33A - ISM: jets and outflows
Abstract:
W33A is a well-known example of a high-mass young stellar object
showing evidence of a circumstellar disc. We revisited the -band
NIFS/Gemini North observations of the W33A protostar using principal
components analysis tomography and additional post-processing
routines. Our results indicate the presence of a compact rotating disc
based on the kinematics of the CO absorption features. The
position-velocity diagram shows that the disc exhibits a rotation
curve with velocities that rapidly decrease for radii larger than
0.1" (∼250AU) from the central source, suggesting a structure
about four times more compact than previously reported.We derived a
dynamical mass of 10.0+4.1-2.2M☉ for the
"disc+protostar" system, about ∼33% smaller than previously
reported, but still compatible with high-mass protostar status. A
relatively compact H2 wind was identified at the base of the
large-scale outflow of W33A, with a mean visual extinction of ∼63mag.
By taking advantage of supplementary near-infrared maps, we identified
at least two other point-like objects driving extended structures in
the vicinity of W33A, suggesting that multiple active protostars are
located within the cloud. The closest object (SourceB) was also
identified in the NIFS field of view as a faint pointlike object at a
projected distance of ∼7000AU from W33A, powering extended K-band
continuum emission detected in the same field. Another source
(SourceC) is driving a bipolar H2 jet aligned perpendicular to the
rotation axis of W33A.
Description:
We presented a reanalysis of the K-band NIFS/Gemini North observations
of the protostar W33A, first done by Davies et al.
(2010MNRAS.402.1504D 2010MNRAS.402.1504D), based on Principal Component Analysis
Tomography. The PCS technique is well adapted to the analysis of
complex data sets like the one analysed here.
Objects:
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RA (2000) DE Designation(s)
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18 14 39.0 -17 52 03 W33A = IRAS 18117-1753
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 109 285 UKIDSS JHK photometry of W33A
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [1/285] Identification
5- 13 F9.5 deg RAdeg Right Ascension (J2000)
15- 23 F9.5 deg DEdeg Declination (J2000)
25- 43 A19 --- UKIDSS UKIDSS designation (JHHMMSS.ss+DDMMSS.s)
45- 49 F5.2 mag Jmag ?=- J-band magnitude
51- 54 F4.2 mag e_Jmag ?=- J-band magnitude error
56- 60 F5.2 mag Hmag H-band magnitude
62- 65 F4.2 mag e_Hmag ?=- H-band magnitude error
67- 71 F5.2 mag Kmag ?=- K-band magnitude
73- 76 F4.2 mag e_Kmag ?=- K-band magnitude error
78- 82 F5.2 mag J-H ?=- J-H color index
84- 87 F4.2 mag e_J-H ?=- J-H color index error
89- 93 F5.2 mag J-K ?=- J-K color index
95- 98 F4.2 mag e_J-K ?=- J-K color index error
100-104 F5.2 mag H-K ?=- H-K color index
106-109 F4.2 mag e_H-K ?=- H-K color index error
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Acknowledgements:
Felipe Navarete, navarete(at)usp.br
References:
Davies et al., 2010MNRAS.402.1504D 2010MNRAS.402.1504D
(End) Felipe Navarete [USP], Patricia Vannier [CDS] 08-Feb-2021