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LARGE SCALE DISTRIBUTION AND PHYSICAL PROPERTIES OF MOLECULAR CLOUDS AND REGIONS OF MASSIVE STAR FORMATION IN THE MILKY WAY Nº Proyecto : 1010431 Concurso : FONDECYT-REGULAR Año Concurso : 2001 Consejo : CIENCIA Duración : 4 años Estado : APROBADO Inicio : Marzo 2001 Término : Marzo 2005 Recursos Asignados (en miles de pesos del año de concurso) Año 2001: 17.393 Año 2002: 15.193 Año 2003: 15.544 Año 2004: 15.544 INVESTIGADOR RESPONSABLE BRONFMAN AGUILO, LEONARDO JAIME COINVESTIGADOR(ES) ALVAREZ MORENO, HECTOR JULIO MAY HUMERES, JORGE INSTITUCION PRINCIPAL UNIVERSIDAD DE CHILE (UCH) FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS DEPARTAMENTO DE ASTRONOMIA
REGIÓN
METROPOLITANA

DISCIPLINA PRINCIPAL

ASTRONOMíA/ CIENCIAS EXACTAS Y NATURALES

SECTOR DE APLICACIÓN

CONOCIMIENTO GENERAL

RESUMEN DEL PROYECTO

The twin Columbia 1.2 m mm-wave telescopes, the northern one at CFA and the southern one at Cerro Tololo, have been used during the last 20 years to put together the most complete and homogeneus CO(1-0) survey of molecular clouds in the Milky Way. We now count with a complete coverage and homogeneus sampling of the whole galactic plane, at a resolution of 8´. Regions of OB star formation in the galactic disk are detected as IRAS point-like sources with FIR colors characteristic of UC HII regions. From a CS(2-1) survey of the dense molecular gas clumps surrounding these regions, we have identified 843 massive star forming regions distributed across the whole galactic disk. Our intention is to give the best rendition of the large scale distribution of molecular clouds and regions of OB star formation in the galactic disk. An important difficulty to remove is the two-fold distance ambiguity within the solar circle: we will use for this purpose observations of HI in absorption from the new Australia Telescope Southern Survey. With well determined distances we will evaluate the efficiency of the massive star formation process, defined as the FIR luminosity to molecular gas mass ratio, both at the scale of spiral arms and at the scale of individual molecular clouds, in search for statiscally significant variations in the mass spectrum of the clouds and in the IMF of their embedded OB star clusters. We will carefully revise the use of the CO(1-0) transition as a tracer of H2 mass for giant molecular clouds, using optically thinner lines from less abundant isotopomers like 13CO and C18O, with emphasis on the very opaque clouds in the molecular ring and in the more optically thin clouds in the outer Galaxy. For the most luminous giant molecular clouds in the galactic disk, in the Norma spiral arm, we will examine the cloud morphology, at a scale of 2´ - 3´, in relation to the location of massive star forming regions. We will use CO, 13CO, and C18O lines obtained with the NANTEN 4m mm-wave telescope at Las Campanas; HI maps from the Australia Telescope; and IRAS images of the galactic plane. We will use ASTE 10 m submillimeter telescope, once installed in Chile, to study the hot dust and gas around massive star forming regions using high J rotational lines of suitable molecules. Our CS survey of massive star forming regions yielded a number of special and interesting sources. Near infrared imaging of selected regions will be used to study, at high resolution, the luminosity function for embedded massive star clusters. Candidate disks surrounding embedded massive stars, which have been detected only, will be tested at 10 um with the ESO TIMMI2 thermal camera, at La Silla. A candidate massive protostar will be imaged too with TIMMI2 and mapped at 1 mm with the OVRO interferometer.

PUBLICACIONES DEL PROYECTO

La finalidad principal de la base de datos de publicaciones FONDECYT es registrar la productividad científica informada por los investigadores de los proyectos financiados por este Fondo. Considerando la importancia que esta información tiene para la comunidad científica y publico en general, CONICYT la hace pública en su sitio web. Sin embargo, es necesario aclarar que no es una base de datos bibliográfica. Los autores informados en cada publicación, ordenados alfabéticamente, son aquellos que participaron directa o indirectamente en el proyecto y no responden necesariamente al orden de los autores del paper original.

ARTICULOS:

ARNAL, E M; MAY HUMERES, JORGE; ROMERO, GISELA ANDREA. A 12CO(J=1 0) STUDY TOWARDS THE ARA OB1 REGION. ASTRONOMY AND ASTROPHYSICS, VOL.412 (2):431-445, 2003.   OKA, TOMOHARU; KAMEGAI, KAZUHISA; HAYASHIDA, MASAAKI; JAYAWARDHANA, RAY; KUBOI, NOBUYUKI; TANAKA, KUNIHIKO; BRONFMAN AGUILO, LEONARDO JAIME; YAMAMOTO, SATOSHI. ATOMIC CARBON IN THE SOUTHERN MILKY WAY. ASTROPHYSICAL JOURNAL, VOL.623 (2):889-896, 2005.   ARAYA, ESTEBAN; HOFNER, PETER; KURTZ, STAN; BRONFMAN AGUILO, LEONARDO JAIME; DEDEO, SIMON. CH3CN OBSERVATIONS TOWARD SOUTHERN MASSIVE STAR-FORMING REGIONS. THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, VOL.157 (2):279-301, 2005.   GYULBUDAGHIAN, ARMEN L; MAY HUMERES, JORGE. CO OBSERVATIONS OF SOUTHERN MOLECULAR CLOUDS. OUTFLOWS FROM YOUNG STELLAR OBJECTS GRV 8 AND GRV 16. ASTROPHYSICS, VOL.48 (1):75-84, 2005.   BRONFMAN AGUILO, LEONARDO JAIME; NURNBERGER, DIETER; SHEPHERD, D S. DISCOVERY OF A MASSIVE PROTOSTAR NEAR IRAS 18507+0121. ASTROPHYSICAL JOURNAL, VOL.602:850-859, 2004.   ALTAMIRANO, P; BOND, J R; BRONFMAN AGUILO, LEONARDO JAIME; BUSTOS, R; CARTWRIGHT, J K; CASASSUS MONTERO, SIMON PABLO; CONTALDI, C R; HOLZAPFEL, W L; MASON, B S; MAY HUMERES, JORGE; MYERS, S T; PADIN, S; PEARSON, T J; PEN, U L; POGOSYAN, D; PRUNET, S; READHEAD, A C; SHEPHERD, M C; SIEVERS, J; TORRES, S; UDOMPRASERT, P S. EXTENDED MOSAIC OBSERVATIONS WITH THE COSMIC BACKGROUND IMAGER. ASTROPHYSICAL JOURNAL, VOL.609:498-512, 2004.   LUNA, A; BRONFMAN AGUILO, LEONARDO JAIME; CARRASCO, L; MAY HUMERES, JORGE. MOLECULAR GAS, KINEMATICS, AND OB STAR FORMATION IN THE SPIRAL ARMS OF THE SOUTHERN MILKY WAY. ASTROPHYSICAL JOURNAL, VOL.641 (2):938-948, 2006.   GONZALEZ, L; GYULBUDAGHIAN, ARMEN L; MAY HUMERES, JORGE; MENDEZ BUSSARD, RENE ALEJANDRO. NEBULOUS OBJECTS IN THE SOUTHERN HEMISPHERE. REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA, VOL.40:137-146, 2004.   GYULBUDAGHIAN, ARMEN L; MAY HUMERES, JORGE. ON ROTATION OF AN ISOLATED GLOBULE. ASTROPHYSICS, VOL.47 (3):352-360, 2004.   BRONFMAN AGUILO, LEONARDO JAIME; CHINI, ROLF; FAUNDEZ, S; GARAY BRIGNARDELLO, GUIDO ALEJANDRO; MAY HUMERES, JORGE; NYMAN, LARS AKE. SIMBA SURVEY OF SOUTHERN HIGH-MASS STAR FORMING REGIONS - I. PHYSICAL PARAMETERS OF THE 1.2-MM/IRAS SOURCES. ASTRONOMY AND ASTROPHYSICS, VOL.426:97-103, 2004.   ALTAMIRANO, P; BOND, J R; BRONFMAN AGUILO, LEONARDO JAIME; CARLSTROM, J E; CARTWRIGHT, J K; CASASSUS MONTERO, SIMON PABLO; CONTALDI, C R; FARMER, A J; HALVERSON, N Y; HOLZAPFEL, W L; JOY, M; KOVAC, J; LEITCH, E M; MASON, B S; MAY HUMERES, JORGE; MYERS, S T; PADIN, S; PEARSON, T J; PEN, U; POGOSYAN, D; PRUNET, S; PRYKE, C; READHEAD, A C; SHEPHERD, M C; SIEVERS, J; UDOMPRASERT, P S. THE ANISOTROPY OF THE MICROWAVE BACKGROUND TO L=3500: DEEP FIELD OBSERVATIONS WITH THE COSMIC BACKGROUND IMAGER. ASTROPHYSICAL JOURNAL, VOL.591 (2):540-555, 2003.   GYULBUDAGHIAN, ARMEN L; MAY HUMERES, JORGE; RODRIGUEZ, LUIS FELIPE; RODRIGUEZ, MONICA. VLA DETECTION OF THE EXCITING SOURCES OF THE HH 288 AND HHL59 OUTFLOWS. REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA, VOL.38:161-167, 2002.

INFORME:

BRONFMAN AGUILO, LEONARDO JAIME. LARGE SCALE DISTRIBUTION AND PHYSICAL PROPERTIES OF MOLECULAR CLOUDS AND REGIONS OF MASSIVE STAR FORMATION IN THE MILKY WAY. 2005. 10 p.

MANUSCRITOS:

BRONFMAN AGUILO, LEONARDO JAIME; GARCIA YUS, JORGE FERNANDO; MAY HUMERES, JORGE; NURNBERGER, DIETER; ROTH FUCHS, MIGUEL. A NIR SURVEY OF HIGH MASS STAR FORMING REGIONS IN THE I AND IV GALACTIC QUADRANT. 9 p.   ALVES, JOAO; BILLMEIER, REBECCA R; BRONFMAN AGUILO, LEONARDO JAIME; JAYAWARDHANA, RAY; MARDONES PEREZ, DIEGO; MARENGO, MASSIMO. MID-INFRARED IMAGING OF MASSIVE YOUNG STARS. 36 p.

PONENCIAS:

BRONFMAN AGUILO, LEONARDO JAIME; FAUNDEZ, S; LOPEZ, CARLOS; MAY HUMERES, JORGE; NYMAN, LARS AKE. OB STAR FORMATION ACROSS THE GALAXY. En: 4º COLOGNE-BONN-ZERMATT-SYMPOSIUM TE DENSE INTERSTELLAR MEDIUM IN GALAXIES. 20030922-20030926. THE DENSE INTERSTELLAR MEDIUM IN GALAXIES, SPRINGER, 2004. Springer Proceedings in Physics. ISBN 3-540-21254-X.

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