J/MNRAS/496/2790 ATOMS I Description and a first look at G9.62+0.19 (Liu+, 2020)
ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - I.
Survey description and a first look at G9.62+0.19.
Liu T., Evans N.J., Kim K.-T., Goldsmith P.F., Liu S.-Y., Zhang Q.,
Tatematsu K., Wang K., Juvela M., Bronfman L., Cunningham M.R., Garay G.,
Hirota T., Lee J.-E., Kang S.-J., Li D., Li P.-S., Mardones D., Qin S.-L.,
Ristorcelli I., Tej A., Toth L.V., Wu J.-W., Wu Y.-F., Yi H.-W., Yun H.-S.,
Liu H.-L., Peng Y.-P., Li J., Li S.-H., Lee C.W., Shen Z.-Q., Baug T.,
Wang J.-Z., Zhang Y., Issac N., Zhu F.-Y., Luo Q.-Y., Soam A., Liu X.-C.,
Xu F.-W., Wang Y., Zhang C., Ren Z., Zhang C.
<Mon. Not. R. Astron. Soc., 496, 2790-2820 (2020)>
=2020MNRAS.496.2790L 2020MNRAS.496.2790L (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; H II regions ; Molecular clouds ;
Interstellar medium ; Milky Way ; Infrared
Keywords: stars: formation - stars: kinematics and dynamics -
ISM: HII regions - ISM: clouds
Abstract:
The ATOMS, standing for ALMA Three-millimeter Observations of Massive
Star-forming regions, survey has observed 146 active star-forming
regions with ALMA band 3, aiming to systematically investigate the
spatial distribution of various dense gas tracers in a large sample of
Galactic massive clumps, to study the roles of stellar feedback in
star formation, and to characterize filamentary structures inside
massive clumps. In this work, the observations, data analysis, and
example science of the ATOMS survey are presented, using a case study
for the G9.62+0.19 complex. Toward this source, some transitions,
commonly assumed to trace dense gas, including CS J=2-1, HCO+J=1-0,
and HCN J=1-0, are found to show extended gas emission in low-density
regions within the clump; less than 25 per cent of their emission is
from dense cores. SO, CH3OH, H13CN, and HC3N show similar
morphologies in their spatial distributions and reveal well the dense
cores. Widespread narrow SiO emission is present (over ∼1pc), which
may be caused by slow shocks from large-scale colliding flows or HII
regions. Stellar feedback from an expanding HII region has greatly
reshaped the natal clump, significantly changed the spatial
distribution of gas, and may also account for the sequential high-mass
star formation in the G9.62+0.19 complex. The ATOMS survey data can be
jointly analysed with other survey data, e.g. MALT90, Orion B, EMPIRE,
ALMA_IMF, and ALMAGAL, to deepen our understandings of 'dense gas'
star formation scaling relations and massive protocluster formation.
Description:
The ATOMS sample of 146 sources was selected from the CS J=2-1 survey
of Bronfman, Nyman & May (1996A&AS..115...81B 1996A&AS..115...81B, Cat. J/A+AS/115/81), a
complete and homogenous molecular line survey of UC HII region
candidates in the Galactic plane. The sample of our 146 targets is
complete for protoclusters with bright CS J=2-1 emission (Tb>2K),
indicative of reasonably dense gas. It is also complete for the
longitude range observable by SEST as well as ALMA (Faundez et al.
2004A&A...426...97F 2004A&A...426...97F, Cat. J/A+A/426/97). Table A1 lists the basic
parameters of this sample, including source IDs in observations, IRAS
names, coordinates, systemic velocities, distances from the sun,
Galactocentric distances, effective radii, dust temperature,
bolometric luminosity, and clump masses. There are 122 clumps with
ATLASGAL and HiGAL counterparts, which have been analysed in detail by
Urquhart, Konig & Giannetti (2018MNRAS.473.1059U 2018MNRAS.473.1059U, Cat.
J/MNRAS/473/1059). The basic parameters for these 122 clumps are
adopted from Urquhart et al. (2018MNRAS.473.1059U 2018MNRAS.473.1059U, Cat.
J/MNRAS/473/1059). The basic parameters for the remaining clumps are
adopted from Faundez et al. (2004A&A...426...97F 2004A&A...426...97F, Cat. J/A+A/426/97).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 79 146 Basic parameters of the targets in the ATOMS
survey
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See also:
J/A+AS/115/81 : A CS(2-1) survey of UC HII regions (Bronfman+, 1996)
J/A+A/426/97 : SIMBA survey. 1.2-mm/IRAS sources (Faundez+, 2004)
J/MNRAS/473/1059 : Complete sample of Galactic clump properties
(Urquhart+, 2018)
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 [1/146] Internal object identifier
5- 15 A11 --- Name IRAS source identifier (IHHMMm+DDMM)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 39 F4.1 arcsec DEs Declination (J2000)
41- 46 F6.1 km/s VLSR Velocity in the local standard of rest
48- 52 F5.2 kpc Dist Distance
54- 57 F4.1 kpc RGC Galactocentric distance
59- 62 F4.2 pc Rad Source radius
64- 67 F4.1 K Tdust Dust temperature
69- 71 F3.1 [Lsun] logLbol Logarithm of the bolometric luminosity
73- 75 F3.1 [Msun] logMclump Logarithm of the clump's mass
77- 79 A3 --- Ref References (1)
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Note (1): References as follows:
1 = Faundez et al. (2004A&A...426...97F 2004A&A...426...97F, Cat. J/A+A/426/97)
2 = Urquhart et al. (2018MNRAS.473.1059U 2018MNRAS.473.1059U, Cat. J/MNRAS/473/1059)
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History:
From electronic version of the journal
References:
Liu et al., Paper II 2020MNRAS.496.2821L 2020MNRAS.496.2821L, Cat. J/MNRAS/496/2821
Liu et al., Paper III 2021MNRAS.505.2801L 2021MNRAS.505.2801L
Zhang et al., Paper IV 2022MNRAS.510.4998Z 2022MNRAS.510.4998Z
Liu et al., Paper V 2022MNRAS.510.5009L 2022MNRAS.510.5009L
Zhou et al., Paper VI 2021MNRAS.508.4639Z 2021MNRAS.508.4639Z
Liu et al., Paper VII 2022MNRAS.511.3618L 2022MNRAS.511.3618L
Qin et al., Paper VIII 2022MNRAS.511.3463Q 2022MNRAS.511.3463Q
Liu et al., Paper IX 2022MNRAS.511.4480L 2022MNRAS.511.4480L
Peng et al., Paper X 2022MNRAS.512.4419P 2022MNRAS.512.4419P
Zhou et al., Paper XI 2022MNRAS.514.6038Z 2022MNRAS.514.6038Z
Saha et al., Paper XII 2022MNRAS.516.1983S 2022MNRAS.516.1983S
Zhang et al., Paper XIII 2023MNRAS.520..322Z 2023MNRAS.520..322Z
Zhang et al., Paper XIV 2023MNRAS.520.3245Z 2023MNRAS.520.3245Z
Xu et al., Paper XV 2023MNRAS.520.3259X 2023MNRAS.520.3259X
(End) Ana Fiallos [CDS] 03-Jul-2023