Past Tuesday UVa / NRAO Astronomy (TUNA) Lunch Talks

A series of informal, brown-bag, lunchtime seminars for the discussion of current projects and astronomical news

Upcoming Talks

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up arrowsee all archived TUNAs.

The schedule

Click on talk titles to get the abstract and location.

October 2009
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
       

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Meredith Hughes, CfA: Resolving Inner Holes in Disks Around Young Stars

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13

Ricardo Schiavon, Gemini: Abundances in M31 Globular Clusters

14

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20

Glenn Jones, NRAO/Caltech: TBA

21

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27

Ming Sun, UVa: Radio AGN, X-ray cool cores and the flip side of galaxy formation

28

29

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31
November 2009
Sunday Monday Tuesday Wednesday Thursday Friday Saturday

1

2

Rasmus Voss, NRAO: Populations of LMXBs in nearby galaxies

3

Kartik Sheth, NRAO: The Spitzer Survey for Stellar Structure in Galaxies (S4G)

4

5

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7

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9

Scott Ransom, NRAO: Searching for Radio Pulsars in Unidentified Fermi LAT Bright Sources

10

Huib Intema, NRAO: TBA

11

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16

Marsha Bishop, NRAO: TBA

17

Rachel Friesen, NRAO: Clustered Low Mass Star Formation in the Ophiuchus Molecular Cloud

18

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21

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23

Al Wootten, NRAO: Nitrogen Isotopic Fractionation in Interstellar Ammonia

24

Manuel Aravena, NRAO: The Varied Nature of MAMBO SMGs in the COSMOS field

25

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30

          
December 2009
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
   

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James Miller-Jones, NRAO: Probing jet acceleration and collimation in stellar-mass compact objects

9

James Miller-Jones, AEI: Searching for continuous gravitational waves with LIGO

10

11

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14

Claudia Cyganowski, NRAO: A promising new diagnostic for identifying actively accreting massive young stellar objects (MYSOs) has emerged from large-scale Spitzer surveys of the Galactic plane: extended emission in the IRAC 4.5 micron band, believed to trace shocked molecular gas in active protostellar outflows. I will discuss the GLIMPSE catalog of extended 4.5 micron sources (called EGOs, Extended Green Objects, for the common coding of the [4.5] band as green in 3-color composite IRAC images) and the evidence that EGOs, as a population, are massive YSOs. I will present the results of high-resolution EVLA surveys of ~20 EGOS in the 6.7 GHz Class II and 44 GHz Class I methanol maser transitions, which respectively trace high-mass protostars and molecular outflows, and a JCMT survey in the molecular outflow tracers HCO+ and SiO. High detection rates of all outflow tracers and the spatial distribution of the masers with respect to the midinfrared emission provide convincing evidence that the surveyed EGOs are much-sought MYSOs which are actively accreting and driving outflows. I complement the survey results with detailed case studies of two EGOs using SMA and CARMA data. The high-resolution mm observations reveal bipolar molecular outflows coincident with the 4.5 micron lobes in both sources. Strong SiO(2-1) emission is also detected, confirming that the extended 4.5 micron emission traces recently shocked gas in active outflows. While a single dominant outflow is identified in each of the studied EGOs, the mm data show that one of the EGOs is associated with at least three compact cores, and may be a protocluster.

15

Adam Leroy, NRAO: What Drives Molecular Cloud Formation in Galaxies?

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31

    

back arrowGo back in time a little bit,
up arrowsee all archived TUNAs.