The Herschel view of massive star formation in G035.39--00.33: a dense and cold filament of W48 undergoing a mini-starburst

Q. Nguyen Luong; F. Motte; M. Hennemann; T. Hill; K. L. J. Rygl; N. Schneider; S. Bontemps; A. Men'shchikov; Ph. André; N. Peretto; L. D. Anderson; D. Arzoumanian; L. Deharveng; P. Didelon; J. Di Francesco; M. J. Griffin; J. M. Kirk; V. Konyves; P. G. Martin; A. Maury; V. Minier; S. Molinari; M. Pestalozzi; S. Pezzuto; M. Reid; H. Roussel; F. Schuller; L. Testi; D. Ward-Thompson; G. J. White; A. Zavagno

HAL: hal-00624630, version 1

arXiv: 1109.3584

DOI: 10.1051/0004-6361/201117831

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Astronomy and Astrophysics 535 (2011) id.A76

The Herschel view of massive star formation in G035.39--00.33: a dense and cold filament of W48 undergoing a mini-starburst

Q. Nguyen Luong, F. Motte ^1, 2, M. Hennemann ³, T. Hill ³, K. L. J. Rygl, N. Schneider ⁴, S. Bontemps ^{5, 6, 7, 8}, A. Men'shchikov ³, Ph. André ³, N. Peretto ³, L. D. Anderson ⁹, D. Arzoumanian, L. Deharveng ^9, 10, P. Didelon ³, J. Di Francesco ¹¹, M. J. Griffin, J. M. Kirk, V. Konyves, P. G. Martin ¹², A. Maury ¹³, V. Minier ^1, 2, S. Molinari ¹⁴, M. Pestalozzi, S. Pezzuto ¹⁴, M. Reid ¹⁵, H. Roussel ¹⁶, F. Schuller ¹⁷, L. Testi ¹³, D. Ward-Thompson ¹⁸, G. J. White ¹⁹, A. Zavagno ^9, 10

(2011)

The filament IRDC G035.39-00.33 in the W48 molecular complex is one of the darkest infrared clouds observed by Spitzer. It has been observed by the PACS (70 and 160 micron) and SPIRE (250, 350 and 500) cameras of the \textit{Herschel} Space Observatory as part of the W48 molecular cloud complex in the framework of the HOBYS key programme. The observations reveal a sample of 28 compact sources (deconvolved FWHM sizes < 0.3 pc) complete down to ~5 solar mass in G035.39-00.33 and its surroundings. Among them, 13 compact sources are massive dense cores with masses >20 solar mass. The cloud characteristics we derive from the analysis of their spectral energy distributions (20-50 solar mass with sizes of 0.1-0.2 pc and average densities of 2-20 x 10^5 cm^3) make these massive dense cores excellent candidates to form intermediate- to high-mass stars. Most of the massive dense cores are located inside the G035.39-00.33 filament and host IR-quiet high-mass protostars. The large number of protostars found in this filament suggests that we are witnessing a mini-burst of star formation with an efficiency of ~20% and a rate density of ~40 solar mass per year per kpc^2 within a ~8 pc^2 area. Part of the extended SiO emission observed toward G035.39-00.33 is not associated with obvious protostars and may originate from low-velocity shocks within converging flows, as advocated by previous studies.

1:	Laboratoire AIM (AIM)

	CEA – Université Paris VII - Paris Diderot

2:	Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) (IRFU)

	CEA : DSM/IRFU

3:	Astrophysique Interactions Multi-échelles (AIM)

	CNRS : UMR7158 – INSU – Université Paris VII - Paris Diderot – CEA : DSM/IRFU

4:	Laboratory for Atmospheric and Space Physics

	University of Colorado

5:	Observatoire aquitain des sciences de l'univers (OASU)

	CNRS : UMS2567 – INSU – Université Sciences et Technologies - Bordeaux I

6:	Université Sciences et Technologies - Bordeaux 1

	Université Sciences et Technologies - Bordeaux I

7:	Laboratoire d'Astrophysique de Bordeaux (LAB)

	CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I

8:	Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB)

	CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I

9:	Laboratoire d'Astrophysique de Marseille (LAM)

	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I

10:	Observatoire Astronomique de Marseille Provence (OAMP)

	INSU – Université de Provence - Aix-Marseille I – CNRS : UMR6110

11:	National Research Council of Canada, Herzberg Institute of Astrophysics

	Herzberg Institute of Astrophysics

12:	Laboratoire des Lois de Comportement du Combustible (LLCC)

	CEA : DEN/DEC/SESC/LLCC

13:	European Southern Observatory (ESO)

	ESO

14:	Interplanetary Space Physics Institute (IFSI) (IFSI-INAF)

	Interplanetary Space Physics Institute

15:	CTVR/Stokes Institute, Engineering Research Building

	University of Limerick

16:	Laboratoire des matériaux et du génie physique (LMGP)

	CNRS : UMR5628 – Institut National Polytechnique de Grenoble (INPG) – Minatec

17:	Max-Planck-Institut für Radioastronomie (MPIFR)

	Max-Planck-Institut

18:	School of Physics & Astronomy

	Cardiff University

19:	Engineering Department

	University of Cambridge

Subject

Physics/Astrophysics/Solar and Stellar Astrophysics

Sciences of the Universe/Astrophysics/Solar and Stellar Astrophysics

Fulltext link:

http://fr.arXiv.org/abs/1109.3584


hal-00624630, version 1
http://hal.archives-ouvertes.fr/hal-00624630
oai:hal.archives-ouvertes.fr:hal-00624630
From: Marie-Paule Pomies <>
Submitted on: Monday, 19 September 2011 12:20:57
Updated on: Tuesday, 15 November 2011 10:22:41