J/ApJ/938/44 MWISP CO obs. toward a 153.60<l<156.50° Gal. reg. (Guo+, 2022)
CO observations toward the filamentary cloud in the Galactic region of
153.60°≤l≤156.50° and 1.85°≤b≤3.50°.
Guo W., Chen X., Feng J., Sun Li, Zhang S., Wang C., Su Y., Sun Y.,
Yan Q., Zhang S., Zhou X., Zhang M., Fang M., Yang Ji
<Astrophys. J., 938, 44 (2022)>
=2022ApJ...938...44G 2022ApJ...938...44G
ADC_Keywords: Carbon monoxide; Surveys; Milky Way; YSOs; Interstellar medium;
Photometry, infrared; Space velocities; Optical
Keywords: Molecular clouds ; Interstellar filaments ; Star forming regions ;
Young stellar objects
Abstract:
We present observations of the J=1-0 transition lines of 12CO,
13CO, and C18O toward the Galactic region of
153.60°≤l≤156.50° and 1.85°≤b≤3.50°, using the
Purple Mountain Observatory 13.7m millimeter telescope. Based on the
13CO data, one main filament and five subfilaments are found
together as a network structure in the velocity interval of
[-42.5,-30.0]km/s. The kinematic distance of this molecular cloud is
estimated to be ∼4.5kpc. The median length, width, excitation
temperature, and line mass of these filaments are ∼49pc, ∼2.9pc,
∼8.9K, and ∼39M☉/pc, respectively. The velocity structures along
these filaments exhibit oscillatory patterns, which are likely caused
by the fragmentation or accretion process along these filaments. The
maximum accretion rate is estimated to be ∼700M☉/pc. A total of
∼162 13CO clumps and ∼103 young stellar objects are identified in
this region. Most of the clumps are in gravitationally bound states.
Three HII regions (G154.359+2.606, SH2-211, and SH2-212) are found to
be located in the apexes of the filaments. Intense star-forming
activity is found along the entire filamentary cloud. The observed
results may help us to better understand the link between filaments
and massive star formation.
Description:
As part of the Milky Way Imaging Scroll Painting (MWISP), observations
were performed with the Purple Mountain Observatory (PMO) 13.7m
millimeter telescope from 2012 April to 2017 February. The three
isotope emission lines of 12CO at 115.271GHz, 13CO at 110.201GHz,
and C18O at 109.782GHz were simultaneously observed with the 3x3
beam Superconducting Spectroscopic Array Receiver (SSAR) system.
A total of 162 CO clumps are extracted from the 13CO data cube, of
which 32% have αvir less than 1 and 90% have αvir less
than 2.
We find 163 candidate YSOs within the cloud traced by 12CO. After
elimination of foreground objects, a total of 103 sources are reserved
as the YSO sample, including 26 (77) sources with (without) Gaia
parallax distance information.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table6.dat 104 162 Properties of the identified dense clumps;
section 3.5
table7.dat 175 103 IR photometric magnitudes of candidate YSOs;
section 3.6
--------------------------------------------------------------------------------
See also:
VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/328 : AllWISE Data Release (Cutri+ 2013)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/360 : Gaia DR2 x AllWISE catalogue (Marton+, 2019)
J/ApJS/141/157 : CO (J=1-0) data of cold IRAS sources (Yang+, 2002)
J/ApJS/161/361 : Millimeter continuum survey for protoclusters (Klein+, 2005)
J/PASJ/59/1185 : Water maser in galactic IRAS sources (Sunada+, 2007)
J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)
J/A+A/482/585 : JHK photometry of stars in Sh 2-212 (Deharveng+, 2008)
J/ApJS/179/249 : Low-luminosity embedded protostar population (Dunham+, 2008)
J/A+A/487/993 : MAMBO Mapping of c2d Clouds and Cores (Kauffmann+, 2008)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)
J/ApJ/698/324 : Spitzer IRDCs (Ragan+, 2009)
J/ApJ/738/27 : Galactic HII regions RRL and continuum data (Balser+, 2011)
J/MNRAS/411/2530 : UBVRIJHK photometry in NGC1624 (Jose+, 2011)
J/AJ/144/31 : Spitzer+2MASS phot. of protostar cand. (Kryukova+, 2012)
J/A+A/554/A55 : C18O(1-0) and N2H+(1-0) in L1495/B213 (Hacar+, 2013)
J/ApJS/208/11 : Red MSX Source Survey: massive protostars (Lumsden+, 2013)
J/MNRAS/431/1752 : ATLASGAL 6.7GHz methanol masers (Urquhart+, 2013)
J/MNRAS/443/1555 : ATLASGAL massive star forming clumps (Urquhart+, 2014)
J/ApJS/221/26 : Radio obs. of Galactic WISE HII regions (Anderson+, 2015)
J/ApJS/220/11 : SEDs of Spitzer YSOs in the Gould Belt (Dunham+, 2015)
J/ApJ/805/157 : BGPS. XIII. Mass functions (Ellsworth-Bowers+, 2015)
J/AJ/150/147 : Galactic HII regions. I. Stellar distances (Foster+, 2015)
J/ApJ/806/231 : MISFITS survey: HCO+ obs. of Spitzer YSOs (Heiderman+, 2015)
J/A+A/584/A91 : Cat. of dense cores in Aquila from Herschel (Konyves+, 2015)
J/AJ/149/127 : The SOS project. IV. NGC 1624 and NGC 1931 (Lim+, 2015)
J/ApJS/218/1 : BGPS. XI. SHARC-II 350um observations (Merello+, 2015)
J/ApJ/798/L27 : CO obs. of molecular clouds in the 2nd quadrant (Sun+, 2015)
J/ApJS/224/7 : CO obs. of the outer arm in the 2nd quadrant (Du+, 2016)
J/A+A/588/A104 : Molecular clouds and star formation (Gong+, 2016)
J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016)
J/A+A/606/A100 : YSOs in California Molecular Cloud (Lada+, 2017)
J/ApJ/838/49 : CO large-field observations around l=150° (Xiong , 2017)
J/A+A/610/A77 : Orion Integral Filament ALMA+IRAM30m N2H+ (Hacar+, 2018)
J/A+A/619/A166 : SEDIGISM, kinematics of ATLASGAL filaments (Mattern+, 2018)
J/MNRAS/477/2220 : Larson relations in massive clumps (Traficante+, 2018)
J/ApJ/885/131 : High-mass SFR plx & proper motion with VLBI (Reid+, 2019)
J/A+A/633/A99 : Gaia DR2 open clusters in the MW. II (Cantat-Gaudin+, 2020)
J/A+A/655/L2 : OGHReS 12CO(2-1) data cubes (Colombo+, 2021)
J/ApJ/921/23 : C18O dense cores identified in the CMC region (Guo+, 2021)
J/ApJS/257/51 : Morph. classif. of MWISP 12CO mol. clouds (Yuan+, 2021)
J/A+A/657/A1 : Maggie filament datacubes (Syed+, 2022)
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Seq Running sequence number (C1 to C162)
6- 10 A5 --- --- [MWISP]
12- 26 A15 --- MWISP Clump identifier (GLLL.lll+B.bbb)
28- 31 F4.2 arcmin amaj [0.97/4.8] Angular major axis size,
Θmaj
33- 36 F4.2 arcmin bmin [0.97/4.5] Angular minor axis size,
Θmin
38- 42 F5.1 deg PA [-40.6/175.5] Position angle
44- 49 F6.2 km/s Vlsr [-40.9/-31] LSR velocity, ν
51- 53 F3.1 K Tpk [1.2/7.4] Peak temperature
55- 58 F4.2 km/s DelV [0.3/2.2] Spectral FWHM, ΔV
60- 63 F4.2 pc Reff [0.28/2] Effective radius after beam
deconvolution (1)
65- 68 F4.1 K Tex [4.6/22.8] Excitation temperature
70- 73 F4.2 --- tau [0.12/3.4] Optical depth, τ
75- 79 F5.2 10+21cm-2 NH2 [0.19/12.1] Hydrogen column density, NH2
81- 85 F5.1 Msun/pc2 Sigc [8.8/656.4] Surface density, Σc
87- 90 F4.2 10+3cm-3 nH2 [0.07/6.6] Volume density, nH2
92- 95 I4 Msun Mlte [15/2416] LTE mass
97- 99 I3 Msun Mvir [8/817] Virial mass
101- 104 F4.2 --- aVir [0.3/3] Virial parameter
(αvir=Mvir/MLTE)
--------------------------------------------------------------------------------
Note (1): Deconvolution radius:
Reff=(1/2)*d*(π/2)(amaj.bmin-θ2beam)0.5
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- WISEA AllWISE identifier (JHHMMSS.ss+DDMMSS.s)
21- 28 F8.4 deg GLON [153.6/156.4] Galactic longitude
30- 35 F6.4 deg GLAT [1.8/3.3] Galactic latitude
37- 42 F6.3 mag W1mag [7.86/15.84] WISE W1 (3.4um) band magnitude
44- 48 F5.3 mag e_W1mag [0.014/0.08] Uncertainty on the W1mag
50- 55 F6.3 mag W2mag [6.64/16.5] WISE W2 (4.6um) band magnitude
57- 61 F5.3 mag e_W2mag [0.01/0.2]? Uncertainty on the W2mag
63- 68 F6.3 mag W3mag [0.46/12.66] WISE W3 (12um) band magnitude
70- 74 F5.3 mag e_W3mag [0.01/0.6]? Uncertainty on the W3mag
76- 81 F6.3 mag W4mag [-2.97/9.05] WISE W4 (22um) band magnitude
83- 87 F5.3 mag e_W4mag [0.001/0.6]? Uncertainty on the W4mag
89- 94 F6.3 mag Jmag [10.38/18.6]? 2MASS J-band (1.25um) magnitude
96- 100 F5.3 mag e_Jmag [0.02/0.3]? Uncertainty on the Jmag
102- 107 F6.3 mag Hmag [10.2/16.6]? 2MASS H-band (1.65um) magnitude
109- 113 F5.3 mag e_Hmag [0.028/0.3]? Uncertainty on the Hmag
115- 120 F6.3 mag Ksmag [10.05/16.03]? 2MASS Ks-band (2.16um) magnitude
122- 126 F5.3 mag e_Ksmag [0.02/0.3]? Uncertainty on the Ksmag
128- 139 A12 --- Class YSO classification (1)
141- 158 I18 --- Gaia ? Gaia DR2 identifier
160- 165 F6.3 --- alpha [-1.6/2.6] Spectral index α
167- 171 F5.3 mas plx [0.17/0.32]? Gaia DR2 parallax
173- 175 F3.1 pc Dist [3.2/5.7]? Distance
--------------------------------------------------------------------------------
Note (1): The marks of Class*, svmgaia, and SVMClass* indicate the candidate
YSOs identified through the scheme of Koenig & Leisawitz (2014ApJ...791..131K 2014ApJ...791..131K)
and obtained from Marton+ (2016, J/MNRAS/458/3479), and Marton+ (2019, II/360),
respectively.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 20-Aug-2024