J/ApJ/876/70 Massive YSOs in the IR dark cloud G79.3+0.3 (Laws+, 2019)
Massive young stellar objects and outflow in the infrared dark cloud G79.3+0.3.
Laws A.S.E., Hora J.L., Zhang Q.
<Astrophys. J., 876, 70 (2019)>
=2019ApJ...876...70L 2019ApJ...876...70L
ADC_Keywords: Molecular clouds; Interstellar medium; YSOs; Carbon monoxide;
Photometry, millimetric/submm; Photometry, infrared;
Stars, masses; Extinction
Keywords: ISM: clouds ; ISM: general ; ISM: individual objects (G79.3+0.3) ;
ISM: structure ; stars: formation ; stars: massive
Abstract:
G79.3+0.3 is an infrared dark cloud in the Cygnus-X complex that is
home to massive deeply embedded young stellar objects (YSOs). We have
produced a Submillimeter Array (SMA) 1.3mm continuum image and 12CO
line maps of the eastern section of G79.3+0.3 in which we detect five
separate YSOs. We have estimated physical parameters for these five
YSOs and others in the vicinity of G79.3+0.3 by fitting existing
photometry from Spitzer, Herschel, and ground-based telescopes to
spectral energy distribution models. Through these model fits we find
that the most massive YSOs seen in the SMA 1.3mm continuum emission
have masses in the 5-6M☉ range. One of the SMA sources was
observed to power a massive collimated 12CO outflow extending at
least 0.94pc in both directions from the protostar, with a total mass
of 0.83M☉ and a dynamical timescale of 23kyr.
Description:
The Submillimeter Array (SMA) is an interferometer consisting of eight
6m diameter antennas operating at millimeter and submillimeter
wavelengths located near the summit of Maunakea, Hawaii. The SMA
observations of G79.3+0.3 were carried out on 2012 July 8th and August
3rd using the Compact and Subcompact array configurations,
respectively. The array used the 230GHz receivers tuned to an LO
frequency of 224.92GHz.
To identify molecular outflows in G79.3+0.3, we examined the 12CO
J=2-1 emission in various velocity bins across the region. The
dominant CO emission feature in the images is the narrow linear
structure at a position angle of 100.4±0.4°. This structure is
seen in the blueshifted velocities from -12km/s up to -50km/s, and in
the redshifted velocities from 11km/s up to 45km/s. This high-velocity
CO emission traces a protostellar outflow from a young protostar in
the region. See Section 3.3.
Objects:
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RA (ICRS) DE Designation(s)
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20 32.3 +40 15 G79.3+0.3 = GAL 079.3+00.3
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 328 28 Fluxes for 28 YSOs in the SMA-observed region
of G79.3+0.3
table3.dat 86 28 SED-derived parameters for the 28 YSOs in the
SMA-observed region of G79.3+0.3
DR15_CO.fits 2880 25602 *The full CO data cube before integration
in FITS format
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Note on DR15_CO.fits: The datacube shows 12CO emission in the DR15 region
spanning 164.113km/s to -172.935km/s in intervals of 1.056km/s. The
data were used to create the integrated outflow in Figure 5, where the
12CO emission is integrated over 7.8 to 46.8km/s for the redshifted
emission and -31.2 to -7.8km/s for the blueshifted emission.
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VI/139 : Herschel Observation Log (Herschel Science Centre, 2013)
J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)
J/ApJ/651/L125 : Water masers associated with dark cloud cores (Wang+, 2006)
J/A+A/476/1243 : Millimeter continuum mapping of Cygnus X (Motte+, 2007)
J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)
J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)
J/ApJ/720/679 : Optical spectroscopy in Cygnus X region (Beerer+, 2010)
J/A+A/511/A24 : MHO Catalogue (Davis+, 2010)
J/ApJ/736/133 : Spitzer-IRS study of massive YSOs in gal. center (An+, 2011)
J/A+A/547/A49 : Herschel EPoS: high-mass overview (Ragan+, 2012)
J/AJ/148/11 : Infrared photometry in Cygnus-X (Kryukova+, 2014)
J/A+A/564/A21 : Ammonia observations in G79.29+0.46 (Rizzo+, 2014)
J/A+A/584/A67 : IRDC18223 images (Beuther+, 2015)
J/AJ/150/191 : IR photometry of YSOs in Cygnus-X DR15 (Rivera-Galvez+, 2015)
J/MNRAS/449/741 : The massive star population of Cygnus OB2 (Wright+, 2015)
J/A+A/592/A21 : Are infrared dark clouds really quiescent? (Feng+, 2016)
J/ApJ/839/108 : YSOs in the star-forming regions W51 & W43 (Saral+, 2017)
J/ApJS/234/8 : YSO jets from UWISH2. IV. Cygnus-X outflows (Makin+, 2018)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Name Spitzer identifier (JHHMMSS.ss+DDMMSS.s;
in Simbad)
21- 30 F10.6 deg RAdeg [308.07/308.13] Right Ascension (J2000)
32- 40 F9.6 deg DEdeg [40.31/40.35] Declination (J2000)
42- 50 E9.3 Jy FJ [0.025/19.17]? Flux density in 2MASS J band
52- 60 E9.3 Jy e_FJ [0.0006/0.12]? Uncertainty in FJ
62- 70 E9.3 Jy FH [0.06/18.01]? Flux density in 2MASS H band
72- 80 E9.3 Jy e_FH [0.0004/0.21]? Uncertainty in FH
82- 90 E9.3 Jy FKs [0.15/17.22]? Flux density in 2MASS Ks band
92-100 E9.3 Jy e_FKs [0.0009/0.73]? Uncertainty in FKS
102-110 E9.3 Jy F3.6 [0.36/54.5] Flux density in Spitzer/IRAC 3.6um
band
112-120 E9.3 Jy e_F3.6 [0.002/8.2] Uncertainty in F3.6
122-130 E9.3 Jy F4.5 [0.54/99] Flux density in Spitzer/IRAC 4.5um band
132-140 E9.3 Jy e_F4.5 [0.002/15] Uncertainty in F4.5
142-150 E9.3 Jy F5.8 [0.48/151.5]? Flux density in Spitzer/IRAC 5.8um
band
152-160 E9.3 Jy e_F5.8 [0.001/22.72]? Uncertainty in F5.8
162-170 E9.3 Jy F8 [1.88/187.2]? Flux density in Spitzer/IRAC 8um
band
172-180 E9.3 Jy e_F8 [0.001/28.1]? Uncertainty in F8
182-190 E9.3 Jy F24 [0.39/1551]? Flux density in Spitzer/MIPS 24um
band
192-200 E9.3 Jy e_F24 [0.008/232.7]? Uncertainty in F24
202-210 E9.3 Jy F70 [3296/7945]? Flux density in Herschel/PACS 70um
band
212-220 E9.3 Jy e_F70 [91/6177]? Flux density uncertainty (Jy)
222-230 E9.3 Jy F100 [6683]? Flux density in Herschel/PACS 100um band
232-240 E9.3 Jy e_F100 [869.7]? Flux density uncertainty (Jy)
242-250 E9.3 Jy F160 [8924]? Flux density in Herschel/PACS 160um band
252-260 E9.3 Jy e_F160 [1110]? Flux density uncertainty (Jy)
262-268 A7 Jy F250 Flux density in Herschel/SPIRE 250um band (1)
270-276 A7 Jy e_F250 Uncertainty in F250 (1)
278-284 A7 Jy F350 Flux density in Herschel/SPIRE 350um band (1)
286-292 A7 Jy e_F350 Uncertainty in F350 (1)
294-300 A7 Jy F500 Flux density in Herschel/SPIRE 500um band (1)
302-308 A7 Jy e_F500 Uncertainty in F500 (1)
310-318 E9.4 Jy F1300 [39/65.8]? Flux density in SMA 1.3mm continuum
image
320-328 E9.4 Jy e_F1300 [0.4/1.3]? Flux density in F1300
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Note (1): These columns are intentionally left blank so that this tabble can
be used with other tables and the sequel article.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg [308.07/308.13] Right ascension (J2000)
12- 20 F9.6 deg DEdeg [40.31/40.35] Declination (J2000)
22 I1 --- SMA [1/5]? SMA 1.3mm source identifier
as in Table 1 (1)
24- 42 A19 --- Name Spitzer identifier (JHHMMSS.ss+DDMMSS.s;
in Simbad)
44 I1 --- Class [1/2] YSO class
46- 50 F5.3 Msun Mass [0.1/5.8] Mass
52- 56 F5.3 Msun e_Mass [0.03/1.8] Mass uncertainty
58- 65 F8.3 Lsun Lum [0.11/1543] Luminosity
67- 73 F7.3 Lsun e_Lum [0.03/470] Lum uncertainty
75- 80 F6.2 mag Av [5/100] Dust extinction
82- 86 F5.2 mag e_Av [1.5/30] Av uncertainty
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Note (1): Corresponding identifiers in SIMBAD as follows:
1 = IRAS 20305+4010
2 = JCMTSF J203222.0+402008
3 = [MES2015] 728
4 = MSX6C G079.3439+00.3191
5 = [RRJ2015] TWOM J203223.02+401922.7
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Nov-2020