15-20 March 2020
Europe/Berlin timezone

X-ray Surveys and the Evolution of Normal Galaxy Emission: Prospects for eROSITA

18 Mar 2020, 11:15


Oral Presentation X-ray emission from Galaxies


Bret Lehmer (University of Arkansas)


Surveys of the extragalactic Universe, from ultraviolet to infrared
wavelengths, have been extremely effective at piecing together a basic picture
of how stars in galaxies evolved throughout cosmic history. At X-ray
wavelengths, normal-galaxy emission (i.e., not due to AGN) is dominated by hot
gas and populations of X-ray binaries (XRBs). eROSITA is expected to detect
~10,000 normal galaxies in X-rays, much larger than the populations of 100s of
normal galaxies that are currently studied in X-ray surveys. In this talk, I
will review recent efforts to establish an empirical framework that
characterizes how the X-ray emission from normal-galaxy populations varies with
galaxy properties like star-formation history and metallicity. I will present
estimates of how the X-ray emission from galaxies likely evolved over cosmic
time in response to changes in galaxy star-formation activity and metallicity.
I will show that X-ray emissivity of the Universe at z > 4-6 is expected to be
dominated by normal-galaxy populations and could provide significant heating of
the early intergalactic medium (IGM) before the epoch of reionization in the
Universe. Finally, I will discuss how eROSITA will help to fill important
knowledge gaps in our empirical framework, and provide broader new insight into
galaxy evolution and the X-ray radiation field of the early IGM.

Primary author

Bret Lehmer (University of Arkansas)

Presentation Materials

There are no materials yet.
Your browser is out of date!

Update your browser to view this website correctly. Update my browser now