J/MNRAS/496/3358 Star Forming Region IRAS12272-6240 JHK photometry (Tapia+ 2020)
Infrared study of the high-mass, multi-stage star-forming region IRAS12272-6240.
Tapia M., Persi P., Roth M., Elia D.
<Mon. Not. R. Astron. Soc. 496, 3358-3370 (2020)>
=2020MNRAS.496.3358T 2020MNRAS.496.3358T (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Photometry, infrared ; Clusters, open
Keywords: HII regions - stars: formation - ISM: jets and flows
Abstract:
IRAS 12272-6240 is a complex star-forming region with a compact
massive dense clump (DC) and several associated masers, located at a
well-determined distance of d=9.3kpc from the Sun. For this study, we
obtained sub-arcsec broad- and narrow-band near-infrared (near-IR)
imaging and low-resolution spectroscopy with the Baade/Magellan
telescope and its camera PANIC. Mosaics of size 2x2arcmin2 in the
JHKs bands and with narrow-band filters centred in the 2.12um H2 and
2.17um Brγ lines were analysed in combination with
Hi-GAL/Herschel and archive IRAC/Spitzer and WISE observations. We
found that the compact DC houses two Class I young stellar objects
(YSOs) that probably form a 21000-au-wide binary system. Its combined
1-1200um spectral energy distribution is consistent with an O9V
central star with a 10-2M☉ disc and a 1.3x104M☉
dust envelope. Its total luminosity is 8.5x104L☉. A series of
shocked H2 emission knots are found in its close vicinity,
confirming the presence of outflows. IRAS 12272-6240 is at the centre
of an embedded cluster with a mean age of 1Myr and 2.6pc in size that
contains more than 150 stars. At its nucleus, we found a more compact
and considerably younger subcluster containing the YSOs. We also
identified and classified the O-type central stars of two dusty
radio/IR HII regions flanking the protostars. Our results confirm that
these elements form a single giant young complex where massive star
formation processes started some 1Myr ago and are still active.
Description:
JHKs individual photometric measurements for all sources in the
observed field. Near-IR images were collected on the night of 2009
June 12 using the Perssons Auxiliary Nasmyth Infrared Camera (PANIC)
attached to the Magellan Baade 6.5-m telescope at Las Campanas
Observatory (Chile).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
jhkphot.dat 74 1150 Individual JHKs photometry
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Byte-by-byte Description of file: jhkphot.dat
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Bytes Format Units Label Explanations
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2- 5 I4 --- Id Identification number
9- 10 I2 h RAh Right ascension (J2000.0)
12- 13 I2 min RAm Right ascension (J2000.0)
15- 19 F5.2 s RAs Right ascension (J2000.0)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0)
26- 27 I2 arcmin DEm Declination (J2000.0)
29- 32 F4.1 arcsec DEs Declination (J2000.0)
36- 40 F5.2 mag Jmag ? J magnitude
43- 46 F4.2 mag e_Jmag ? Uncertainty of J magnitude
50- 54 F5.2 mag Hmag H magnitude
57- 60 F4.2 mag e_Hmag Uncertainty of H magnitude
64- 68 F5.2 mag Ksmag Ks magnitude
71- 74 F4.2 mag e_Ksmag Uncertainty of Ks magnitude
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Acknowledgements:
Mauricio Tapia, mt(at)astro.unam.mx
(End) Patricia Vannier [CDS] 08-Jul-2020