W40 region in the Gould Belt : An embedded cluster and H II region at the junction of filaments
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TLDR
In this paper, a multi-wavelength study of W40 star-forming region using IR observations in UKIRT JHK bands, Spitzer IRAC bands & Herschel PACS bands; 2.12 micron H2 narrow-band imaging; and radio observations from GMRT (610 and 1280 MHz), in a FoV of ~34'x40'.Abstract:
We present a multiwavelength study of W40 star-forming region using IR observations in UKIRT JHK bands, Spitzer IRAC bands & Herschel PACS bands; 2.12 micron H2 narrow-band imaging; & radio observations from GMRT (610 & 1280 MHz), in a FoV of ~34'x40'. Spitzer observations along with NIR observations are used to identify 1162 Class II/III & 40 Class I sources in the FoV. The NN stellar surface density analysis shows that majority of these YSOs constitute the embedded cluster centered on the source IRS1A South. Some YSOs, predominantly younger population, are distributed along & trace the filamentary structures at lower stellar surface density. The cluster radius is obtained as 0.44pc - matching well with the extent of radio emission - with a peak density of 650pc^-2. The JHK data is used to map the extinction which is subsequently used to compute the cloud mass. It has resulted in 126 Msun & 71 Msun for the central cluster & the northern IRS5 region, respectively. H2 narrow-band imaging displays significant emission, which prominently resembles fluorescent emission arising at the borders of dense regions. Radio analysis shows this region as having blister morphology, with the radio peak coinciding with a protostellar source. Free-free emission SED analysis is used to obtain physical parameters of the overall region & the IRS5 sub-region. This multiwavelength scenario is suggestive of star formation having resulted from merging of multiple filaments to form a hub. Star formation seems to have taken place in two successive epochs, with the first epoch traced by the central cluster & the high-mass star(s) - followed by a second epoch which is spreading into the filaments as uncovered by the Class I sources & even younger protostellar sources along the filaments. The IRS5 HII region displays indications of swept-up material which has possibly led to the formation of protostars.read more
Citations
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TL;DR: In this paper, the authors report on new distances and proper motions to seven stars across the Serpens/Aquila complex, including the proto-Herbig AeBe object EC 95.
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Observational evidence of dynamic star formation rate in milky way giant molecular clouds
TL;DR: In this article, the authors cross-correlate 5469 giant molecular clouds (GMCs) from a new all-sky catalog with 256 star forming complexes (SFCs) to build a sample of 191 SFC-GMC complexes.
Journal ArticleDOI
The Gould's Belt Distances Survey (GOBELINS) III. The distance to the Serpens/Aquila Molecular Complex
Gisela N. Ortiz-León,Sergio A. Dzib,Marina Kounkel,Laurent Loinard,Laurent Loinard,Amy J. Mioduszewski,Luis F. Rodríguez,Rosa M. Torres,Gerardo Pech,Juana L. Rivera,Lee Hartmann,Andrew F. Boden,Neal J. Evans,Cesar Briceno,John J. Tobin,Phillip A. B. Galli,Phillip A. B. Galli +16 more
TL;DR: In this article, the authors report on new distances and proper motions to seven stars across the Serpens/Aquila complex, including the proto-Herbig AeBe object EC 95.
Journal ArticleDOI
A Multi-wavelength Study of Star Formation Activity in the S235 Complex
Lokesh K. Dewangan,Lokesh K. Dewangan,Devendra K. Ojha,A. Luna,B. G. Anandarao,Joe P. Ninan,K. K. Mallick,Y. D. Mayya +7 more
TL;DR: In this paper, the authors carried out an extensive multi-wavelength study to investigate the star formation process in the S235 complex, and they found that the Bolocam clump masses increase as we move away from the location of the ionizing star and that the molecular outflows are detected in these three subregions, further confirming the ongoing star formation activity.
Journal ArticleDOI
Star-forming content of the giant molecular filaments in the Milky Way
TL;DR: In this article, the star formation rates of all known giant molecular filaments (GMFs) were investigated and the star-forming content of all currently known GMFs was investigated systematically.
References
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Journal ArticleDOI
Molecular-line and continuum study of the W40 cloud
TL;DR: In this paper, the authors studied the dense cloud associated with W40, which is one of the nearby H ii regions, in millimetre-wave molecular lines and in the 1.2-mm continuum.
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