Northwestern Events Calendar

May
15
2017

CIERA Special Seminar: Stephen Zepf, "The IMF in Early-Type Galaxies and also their UV Upturn"

When: Monday, May 15, 2017
12:00 PM - 1:00 PM CT

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Gretchen Oehlschlager   (847) 467-1338

Group: CIERA - Conferences/Collab Meetings

Category: Lectures & Meetings

Description:

Steve Zepf (Michigan State)

Hosts: Raffaella Margutti & Vicky Kalogera

The IMF in Early-Type Galaxies and also their UV Upturn

I will discuss several programs aimed at understanding how early-type galaxies and their globular clusters form. The stellar initial mass function (IMF) in early type galaxies is a critical parameter for many aspects of galaxy evolution, yet it is difficult to constrain because all of the massive stars in the galaxies are long dead, and the lowest mass stars contribute very little light. I will present results from our study of the number of low-mass X-ray binaries in the field of eight early-type galaxies. We show that the data are consistent with an IMF in which the relative number of massive stars does not vary with early-type galaxies properties. I will also discuss a project aimed at understanding the far-ultraviolet emission from globular clusters. We show that metal-rich globular clusters in a number of galaxies are much brighter in the FUV than expected from simple stellar populations models, but are well fit by models with extensive "second-generation" populations enhanced in helium. This demonstrates the ubiquity of the second generation phenomena in globular clusters, and also suggests that the FUV upturn in elliptical galaxies may originate in globular clusters.

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