Halpha filaments in Massive Ellipticals: the roles played by Turbulence and type Ia Supernovae

Add to your list(s) Download to your calendar using vCal

• Rajsekhar Mohapatra (Princeton)
• Friday 10 May 2024, 11:30-12:30
• Ryle seminar room + online.

If you have a question about this talk, please contact Sandro Tacchella.

Massive elliptical galaxies are often quiescent in star formation, despite hosting large amounts of -10 million K gas in their ISM , which can cool in a few 100 Myr and fuel star formation. Many of these elliptical galaxies also host massive kpc-scale filaments of cooler atomic (10^4 K) and molecular gas (~10 K) which coexist with the hot ISM .

Two of the outstanding problems related to these systems are – (1) when and how do these cold filaments form? and (2) what keeps the rest of the ISM of the elliptical galaxies hot?

In the first part of this presentation, I will discuss the results of our latest local patch simulations with gravity, turbulence, and radiative cooling physics included. I will present a new condensation criterion to form cold gas from the hot ISM , which takes the effect of turbulence, cooling, and buoyancy into account. (https://arxiv.org/abs/2302.09380)

In the inner few kilo-parsecs (kpc) of the elliptical galaxies, the net heating due to type 1a supernovae (SNIa) is comparable to the net radiative cooling rate and can help maintain the ISM hot. In the second part of the talk, I will present the results from our 1 kpc ISM -patch simulations with individually resolved type SNIa bubbles. I will discuss how these SNIa heat the ISM and drive turbulence in it. Finally, I will compare our results against more commonly implemented smooth heating models in previous theoretical studies. (arxiv: https://arxiv.org/abs/2402.03613)

This talk is part of the Galaxies Discussion Group series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Galaxies Discussion Group
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Ryle seminar room + online

Note that ex-directory lists are not shown.