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Elisa Chisari

Elisa Chisari has written 19 posts for astrobites

Groups and clusters: who turned off the AC?

Gas in clusters is predicted to cool quickly, but observations suggest otherwise. What prevents the gas from cooling? The authors explore the incidence and impact of heating by active galactic nuclei.

Searching for a dwarf

How small and faint can galaxies get? The authors of this paper report on the discovery of a dwarf galaxy in the Sculptor group.

The Sun, a gravitational wave detector

Gravitational waves passing through our solar system make the Sun ring like a bell. Can their effect be measured to learn about the violent phenomena that caused them?

Filling the redshift gap with carbon monoxide mapping

Can we find galaxies using the light emitted by their star forming regions? The authors of this paper explore a technique that would allow us to reach relatively unexplored epochs of the Universe.

http://arxiv.org/abs/1404.0680

Neutrinos from the Big Bang – in focus

Much like the Cosmic Microwave Background, the Cosmic Neutrino Background permeates our Universe and it could take us back to 1 second after the Big Bang. Today, we discuss the effect of the Sun on modulating the expected signal from the neutrino background.

http://fermi.gsfc.nasa.gov/

Gamma-rays from the Galactic Center, a dark matter

For a few years now, excess emission of gamma-rays in the direction of the Galactic Center has puzzled scientists. In the paper we discuss today, the authors re-analyze data from the Fermi telescope to get new insights into the origin of this excess emission. They make the case for the signal being described by dark matter particles annihilating in the center of our Galaxy.

New probes of cosmology: Doppler Lensing

What do the sizes of galaxies have to tell us about cosmology? Today, we discuss how the velocity of a galaxy can change its observed size and tell us about the properties of the Universe.

From nuisance to new science: gravitational lensing of supernovae

There might be more information in the Hubble diagram of supernovae than we first thought. Far away supernovae are subject to gravitational lensing and in the upcoming decades, they could be used to determine how much matter there is in the Universe and how it clusters.

Where is that galaxy pointing?

Gravitational lensing is the deflection of the trajectory of a photon by gravity, and it is a natural consequence of the theory of General Relativity. Lensing distorts the shapes and orientations of galaxies and in today’s post, we discuss a new method to reconstruct dark matter maps of our Universe using the position angles of galaxies.

Citizen science: Observing dark worlds

Observing dark worlds is a public competition for improving algorithms to find dark matter halos in weak gravitational lensing maps. Today, we discuss citizen science projects and describe the results of the challenge.

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