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Á L V A R O S Á N C H E Z M O N G E B A R C E L O N A - N O V E M B E R 23, 2006 Centimeter and Millimeter Emission from Selected High-Mass Star-Forming Regions

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Centimeter and Millimeter Emission from Selected High-Mass Star-Forming Regions. Á L V A R O S Á N C H E Z M O N G E. B A R C E L O N A - N O V E M B E R 23, 2006. Isolated mode Typically, one star per core of dense gas Low-Mass Star-Forming Regions. Clustered mode - PowerPoint PPT Presentation

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Page 1: Á L V A R O S Á N C H E Z M O N G E

Á L V A R O S Á N C H E Z M O N G EB A R C E L O N A - N O V E M B E R 23, 2006

Centimeter and Millimeter Emission from Selected High-Mass Star-Forming Regions

Page 2: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 2

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS INTRODUCTION

Isolated mode

Typically, one star per core of dense gas

Low-Mass Star-Forming Regions

Clustered mode

A group of stars in a single massive dense core

Low-Mass Star-Forming Regions

High-Mass Star-Forming Regions

Our aim is to study YSOs forming in the surroundings of high-mass stars.

We need to study the gas and dust condensations with:high-angular resolution.high sensitivity.

STAR FORMATION

Page 3: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 3

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS SELECTION CRITERIA

We need candidates to massive protostars Selected from the lists compiled byMolinari et al. 1996 (A&A, 308, 573)Mueller et al. 2002 (ApJS, 143, 469)Sridharan et al. 2002 (ApJ, 634, L57)

• Distance 3.5 kpc

We want to study the surroundings of high-mass star-forming regions.

• IRAS bolometric luminosity 1000 L

• Strong millimeter emission in single-dish (I1.2 mm 100 mJy beam-1)

• Weak centimeter emission (S3.6 cm 10 mJy)

to be sensitive to low-mass condensations of 1 M to select intermediate/high-mass targetsto assures a young evolutionary stage of the massive star-forming regionto assures that the HII region is not evolved enough to have disrupted the surrounding material

For 10 regions we found no available cm & mm data in the literature

Page 4: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 4

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS OBSERVATIONS

IRAM 30m

MPIfR 117-element bolometer array MAMBO

we map the dust continuum emission at 1.2 mm

VLA (Very Large Array)

we observed the radio-continuum emisson at 3.6 and 1.3 cm

Page 5: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 5

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS RESULTS

centimeter sources detected in the survey

with the flux density at 3.6 and 1.3 cm we can estimate the spectral index

12 can be classified as HII regions

physical parameters of the UCHII regions

Page 6: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 6

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS YOUNG CLUSTERS

centimeter compact sources

millimeter emission

2MASS source with small infrared excess

Young Cluster *

* Klein et al. 2005 (ApJSS, 161, 361)

Page 7: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 7

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS IRAS 00117 + 6412

IRAS 00117 + 6412 L = 1300 L

d = 1.8 kpc

Spectral index (VLA 2+3): 0.5 ± 0.2

Spectral type: B 2

M dust = 40 M

NH3 detected

Black: 3.6 cmWhite: 1.3 cmGreen: 1.2 mmCrosses: 2MASS sourcesEllipse: IRAS ellipsoide

Good Candidate

to study interactions between YSOs

Page 8: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 8

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS IRAS 18171 - 1548

IRAS 18171 - 1548 L = 7900 L

d = 2.6 kpc

Spectral index (VLA 2): 0.4 ± 0.3

Spectral type: B 1

M dust = 160 M

Black: 3.6 cmWhite: 1.3 cmGreen: 1.2 mmCrosses: 2MASS sourcesEllipse: IRAS ellipsoide

Page 9: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 9

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS IRAS 19045 + 0813

IRAS 19045 + 0813 L = 1600 L

d = 1.6 kpc

Spectral index (VLA 8): 1.0 ± 0.3

Spectral type: B 2.5

M dust = 11 M

Black: 3.6 cmWhite: 1.3 cmGreen: 1.2 mmCrosses: 2MASS sourcesEllipse: IRAS ellipsoide

Page 10: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 10

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS EVOLVED PROTOCLUSTERS

centimeter compact sources

millimeter emission

2MASS source with high infrared excess

Evolved ProtoCluster *

* Klein et al. 2005 (ApJSS, 161, 361)

Page 11: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 11

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS IRAS 04579 + 4703

IRAS 04579 + 4703

Spectral index (VLA 1): < 1.1

Spectral type: B 2.5

Black: 3.6 cmWhite: 1.3 cmGreen: 1.2 mmCrosses: 2MASS sourcesEllipse: IRAS ellipsoide

L = 4000 L

d = 2.5 kpc

M dust = 26 M

NH3 detected

Page 12: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 12

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS NGC 7538 - IRS 9

NGC 7538 - IRS 9

Spectral index (VLA 2): > -1.3Spectral type: B 1

L = 40000 L

d = 2.8 kpc

Spectral index (VLA 3): > -0.1

Black: 3.6 cmWhite: 1.3 cmGreen: 1.2 mmCrosses: 2MASS sourcesEllipse: IRAS ellipsoideBlue lines: outflows

Spectral type: B 1.5

M dust = 40 M

NH3 detected

Page 13: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 13

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS PROTOCLUSTERS

centimeter compact sources

millimeter emission

no 2MASS source associated

ProtoCluster *

* Klein et al. 2005 (ApJSS, 161, 361)

Page 14: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 14

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS IRAS 22198 + 6336

IRAS 22198 + 6336 L = 1300 L

d = 1.3 kpc

Spectral index (VLA 3): 1.3 ± 0.4

Spectral type: B 3

M dust = 25 M

NH3 detected

Black: 3.6 cmWhite: 1.3 cmGreen: 1.2 mmCrosses: 2MASS sourcesEllipse: IRAS ellipsoide

The Youngest Massive Star

of this Survey

Page 15: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 15

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS “EXTRA”

centimeter emission displacedwith respect to the millimeter emission

no 2MASS associated

“Extra”

Page 16: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 16

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS “EXTRA” (1)

IRAS 20293 + 4007

IRAS 22187 + 5559

no 2MASS source

millimeter emission displaced

no 2MASS source

millimeter emission displaced

extended emission

Page 17: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 17

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS “EXTRA” (2)

IRAS 23448 + 6010

IRAS 18123 - 1203

cluster of 2MASS sources

millimeter emission displaced

extended emission

no 2MASS source

millimeter emission displaced

3.6 cm emission displaced

1.3 cm emission displaced

Page 18: Á L V A R O S Á N C H E Z M O N G E

ÁLVARO SÁNCHEZ MONGE - BARCELONA NOVEMBER 23, 2006 18

CENTIMETER AND MILLIMETER EMISSION FROM SELECTED HIGH-MASS STAR-FORMING REGIONS SUMMARY

• We have studied 10 regions at mm & cm wavelengths

• We have found 12 HII regions, most of them UCHII regions

• In all the cases, a B type star is required to ionize the gas

• We can classify the UCHII regions in different evolutionary stages

• IRAS 00117+6412 is a good candidate to study the surrounding material(a complete study of this source will be presented in Busquet et al.)

Page 19: Á L V A R O S Á N C H E Z M O N G E

Á L V A R O S Á N C H E Z M O N G EB A R C E L O N A - N O V E M B E R 23, 2006

Thank You !

Centimeter and Millimeter Emission fromSelected High-Mass Star-Forming Regions


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