J/ApJ/884/84 Infrared photometry of YSOs in AFGL 5157 (Dewangan+, 2019)
The cluster-forming site AFGL 5157: colliding filamentary clouds and star
formation.
Dewangan L.K.
<Astrophys. J., 884, 84-84 (2019)>
=2019ApJ...884...84D 2019ApJ...884...84D (SIMBAD/NED BibCode)
ADC_Keywords: YSOs; Photometry, infrared; Star Forming Region
Keywords: dust, extinction; H II regions; ISM: clouds
ISM: individual objects: AFGL 5157; stars: formation
Abstract:
We observationally investigate star formation process occurring in
AFGL 5157 (area ∼13.5pcx13.5pc) using a multi-wavelength approach.
Embedded filaments are seen in the Herschel column density map, and
one of them is identified as an elongated filamentary feature (FF)
(length ∼8.3pc; mass ∼1170M☉). Five Herschel clumps
(Mclump∼45-300M☉) are traced in the central part of the FF,
where an extended temperature structure (Td∼13.5-26.5K) is observed.
In the direction of the central part of the FF, the warmer region at
Td∼20-26.5K spatially coincides with a mid-infrared shell
surrounding a previously known evolved infrared cluster. Diffuse
Hα emission is traced inside the infrared shell, suggesting the
presence of massive stars in the evolved cluster. Based on the surface
density analysis of young stellar objects (YSOs), embedded clusters of
YSOs are traced toward the central part of the FF, and are distributed
around the infrared shell. Previously detected H2O masers, H2
knots, massive protostar candidates, and an H II region are also seen
toward the embedded clusters. Using the 12CO and 13CO line data,
the central part of the FF is observed at the overlapping zones of two
filamentary molecular clouds (length ∼12.5pc) around -20 and -17km/s,
which are also connected in velocity. Our observational results
suggest that the formation of massive stars appears to be triggered by
a collision of two filamentary molecular clouds, which might have also
influenced the birth of YSOs in AFGL 5157.
Description:
Our present work deals with an area of
∼0.43°(13.5pc)x0.43°(13.5pc) (central coordinates:
l=176.445°; b=0.215°) containing AFGL 5157. We analyzed the
data sets in the optical, infrared, submillimeter, and radio regimes,
which were obtained from several surveys.
Five College Radio Astronomy Observatory (FCRAO) 12CO(1-0) and
13CO(1-0) line data (velocity resolution ∼0.25km/s) were employed in
this paper, which were observed as part of the Extended Outer Galaxy
Survey (E-OGS; Brunt 2004ASPC..317...79B 2004ASPC..317...79B). The CO data cubes were
given by M. Heyer and C. Brunt (2019, private com.).
We also downloaded the Spitzer post-Basic Calibrated Data images at
3.6, 5.8, and 8.0um from the Spitzer Heritage Archive (ID: 50244;
PI: G. Fazio).
See Section 2.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
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05 37 47.82 +31 59 23.9 AFGL 5157 = NGC 1985
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 62 167 Near-infrared and Spitzer IRAC/GLIMPSE photometric
magnitudes of selected YSOs
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
J/ApJ/428/693 : Rosette Nebula and Maddalena Cloud structures (Williams+ 1994)
J/AJ/117/446 : AFGL 5157 near-IR imaging (Chen+, 1999)
J/ApJS/161/361 : Millimeter continuum survey for protoclusters (Klein+, 2005)
J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)
J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)
J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)
J/MNRAS/404/661 : Young stellar outflows near-IR imaging (Varricatt+ 2010)
J/ApJ/844/38 : MHOs toward 22 regions with H2 fluxes (Wolf-Chase+, 2017)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/167] Running sequence number
(<[D2019b] YSO NNN> in Simbad)
5- 11 F7.3 deg GLON [176.26/176.7] Galactic longitude
13- 17 F5.3 deg GLAT [0.02/0.5] Galactic latitude
19- 23 F5.2 mag Jmag [10.88/20.41]? J-band magnitude
25- 29 F5.2 mag Hmag [8.7/18.7]? H-band magnitude
31- 35 F5.2 mag Kmag [7.27/17.6]? K band magnitude
37- 41 F5.2 mag 3.6mag [8.86/17]? Spitzer/IRAC 3.6um band magnitude
43- 47 F5.2 mag 4.5mag [8.36/15.3]? Spitzer/IRAC 4.5um band magnitude
49- 53 F5.2 mag 5.8mag [9/14.8]? Spitzer/IRAC 5.8um band magnitude
55- 59 F5.2 mag 8.0mag [8.3/14.1]? Spitzer/IRAC 8um band magnitude
61- 62 A2 --- Class YSO class ("II", 156 occurrences or
"I", 11 occurrences)
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 26-Oct-2023