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001-es BibID:	BIBFORM125651
035-os BibID:	(Scopus)85200243786 (WOS)001279958300001
Első szerző:	Saha, Anindya
Cím:	Direct Observational Evidence of Multi-epoch Massive Star Formation in G24.47+0.49 / Saha, Anindya; Tej, Anandmayee; Liu, Hong-Li; Liu, Tie; Garay, Guido; Goldsmith, Paul F.; Lee, Chang Won; He, Jinhua; Juvela, Mika; Bronfman, Leonardo; Baug, Tapas; Vázquez-Semadeni, Enrique; Sanhueza, Patricio; Li, Shanghuo; Chibueze, James O.; Bhadari, N. K.; Dewangan, Lokesh K.; Das, Swagat Ranjan; Xu, Feng-Wei; Issac, Namitha; Hwang, Jihye; Tóth, L. Viktor
Dátum:	2024
ISSN:	2041-8205 2041-8213
Megjegyzések:	Using new continuum and molecular line data from the Atacama Large Millimeter/submillimeter Array Three-millimeter Observations of Massive Star-forming Regions (ATOMS) survey and archival Very Large Array, 4.86 GHz data, we present direct observational evidence of hierarchical triggering relating three epochs of massive star formation in a ringlike H ii region, G24.47+0.49. We find from radio flux analysis that it is excited by a massive star(s) of spectral type O8.5V-O8V from the first epoch of star formation. The swept-up ionized ring structure shows evidence of secondary collapse, and within this ring, a burst of massive star formation is observed in different evolutionary phases, which constitutes the second epoch. ATOMS spectral line (e.g., HCO+(1-0)) observations reveal an outer concentric molecular gas ring expanding at a velocity of ?9 km s?1, constituting the direct and unambiguous detection of an expanding molecular ring. It harbors twelve dense molecular cores with surface mass density greater than 0.05 g cm?2, a threshold typical of massive star formation. Half of them are found to be subvirial and thus in gravitational collapse making them the third epoch of potential massive star-forming sites. ? 2024. The Author(s). Published by the American Astronomical Society.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Astrophysical Journal Letters. - 970 : 2 (2024), p. 1-15. -
További szerzők:	Tej, Anandmayee Liu, Hong-Li Liu, Tie Garay, Guido Goldsmith, Paul F. Lee, Chang Won He, Jinhua Juvela, Mika Bronfman, Leonardo Baug, Tapas Vázquez-Semadeni, Enrique Sanhueza, Patricio Li, Shanghuo Chibueze, James O. Bhadari, N. K. Dewangan, Lokesh K. Das, Swagat Ranjan Xu, Feng-Wei Issac, Namitha Hwang, Jihye Tóth L. Viktor (1964-) (csillagász)
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