Astronomy Colloquia at Caltech for 2014-15

Colloquia are held every Wednesday during the academic year at 4pm in the Cahill Hameetman auditorium.
Wine and cheese will be served in the Cahill Foyer from 5-6pm.

Month
Date
Speaker

Talk Title
OCTOBER
01


Nicholas Law
Univ North Carolina

Host: Shri Kukarni

TBD

08

Shane Davis
Virginia

Host: Phil Hopkins

How Black Holes Dine above the Eddington "Limit" without Overeating
or Excessive Belching

The study of super-Eddington accretion is essential to ourunderstanding of the growth of super-massive black holes in the early universe, the accretion of tidally disrupted stars, and the nature of ultraluminous X-ray sources. Unfortunately, this mode of accretion is particularly difficult to model because of the multidimensionality of the flow, the importance magnetohydrodynamic turbulence, and the dominant dynamical role played by radiation forces. However, recent increases in computing power and advances in algorithms are facilitating major improvements in our ability to model the transport of radiation in numerical simulations of astrophysical plasmas.  I will briefly describe our new radiation transfer modules and discuss our efforts to model super-Eddington accretion flows.  I will focus on applications to ultraluminous X-ray sources, which must be radiating well above their Eddington luminosity unless they harbor intermediate mass black holes. I will argue that most of these sources can be (and likely are) "normal" ~10 solar mass black holes accreting and radiating with luminosities well above their Eddington "limit".

15

John Wise
Georgia Tech

Host: Christian Ott

TBD

22

Todd Thompson
Ohio State

Host: Christian Ott

TBD

29

Meredith Hughes
Wesleyan

Host: Jessie Christiansen

TBD

NOVEMBER 5

Bekki Dawson
Berkeley

Host: Jessie Christiansen

TBD

12

Amy Reines
Univ of Michigan

Host: Fiona Harrison

TBD

19

Jenny Greene
Princeton

Host: Judy Cohen

TBD

DECEMBER
3

Speaker
Institute

Host:



JANUARY
14

Eve Ostriker
Princeton

Host: Phil Hopkins

TBD

21

Joshua Frieman
Fermilab

Host: Richard Ellis

TBD

28

Kartik Sheth
NRAO

Host: Gregg Hallinan

TBD

FEBRUARY
4

Speaker
Institute

Host:



11

Speaker
Institute

Host:



18

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25

Speaker
Institute

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MARCH
4

Speaker
Institute

Host:



11

Kathryn Johnston
Columbia

Host: Judy Cohen

TBD

APRIL
1

Speaker
Institute

Host:



8

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15

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22

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29

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MAY
6

Speaker
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13

Speaker
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20

Speaker
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27

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Institute

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Information for Speakers

Previous Astronomy Colloquia:


Updated: