Compromised Cosmic Shear: Approximations That Bias Cosmology

The distortion of the images of distant galaxies by the gravity of the large-scale structure of the Universe can be a powerful tool to help us understand our Universe. By measuring this distortion, known as cosmic shear, we can constrain cosmological parameters. However, in our analyses, we make certain approximations that may no longer be valid. Anurag Deshpande, a second-year PhD student tells us about two such effects; the reduced shear approximation and magnification bias.

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PhD Life at MSSL

It’s the time of year again when you may be considering applying for a PhD at MSSL. To give you a sense of what life is really like here, some of our new students will answer questions about how they are finding life as a research student here at the lab. Joana and Kaye joined the Astrophysics group earlier this year.

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A Long Time Ago in a Dusty Galaxy Far Away

Dust is a very important element present everywhere in the Universe. In particular, dust attenuation absorbs, scatters and re-emits light.  Nevertheless, not much is known on how dust affects light from galaxies at high redshift, since it is difficult to observe them. Mónica Tress, a final-year-PhD explains more about how dust attenuation effects are studied in galaxies far away.

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SPINS UK Meeting 29th May and Public Lecture on Gravitational Waves

After the first hugely successful meeting at UEA last year, this year UCL will host the 2nd meeting of the SPINS-UK Consortium. MSSL has a particularly strong involvement with this event: Prof. Silvia Zane is one of the scientific organisers, whilst postdoc Ziri Younsi along with PhD students Nabil Brice and Tom Kimpson all on the local organising committee. In addition to an extensive programme of scientific talks covering a range of neutron-star related science, there will also be discussion to address Brexit and the impact on scientific research and a public lecture (http://www.spins-uk.net/public-lecture.html) on gravitational waves by Prof. Alberto Vecchio of the University of Birmingham.

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Neighbourhood Astrophysics: Detecting Gamma-ray Flashes above the Earth

Many of our Astro PhD students partake in other projects outside of their area of research. Ahlam Al Qasim (a 2nd year PhD student) and Aisha AlMannaei (a 1st year PhD student) are both working on Cubesat RAAD (Rapid Acquisition Atmospheric Detector), a mission recently funded by the UAE Space Agency through winning the Mini-satellite competition held last year. The competition was seeking out proposals from university students across the UAE for a science mission to be integrated on a Cubesat, with a launch opportunity in 2020. Their mission is aimed at studying the phenomenon of Terrestrial Gamma-Ray Flashes (TGFs), which are highly energetic events emitted via thundercloud activity in Earth’s atmosphere. Ahlam is the student PI of the science case and TGF simulations, and Aisha is the student PI for the detector development. Here, they discuss how the project was initiated and eventually extended to a fully funded mission, and what their current roles are.

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Cosmic rays: the secret agent of galaxy evolution

Cosmic rays are rays of energetic particles and radiation, with their composition in our own Galaxy being dominated by protons. Ellis Owen, a final-year PhD student working on cosmic rays, star-formation and galaxy evolution, tells us about his research on them.

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Christmas Cosmology: The 12th Tonale Cosmology Winter School

Every year in the Italian Alps, the renowned Tonale Cosmology Winter School takes place. This school brings together PhD students, Master’s students, and Post-docs in Cosmology from across the world, allowing them to share ideas and informing them of the state-of-the-art. One of our first year PhD’s, Anurag Deshpande, was fortunate enough to attend. He reports back on the school.

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A Graduate Traineeship at ESA: Working on the James Webb Space Telescope

Not all PhD students join us directly after finishing their Master degree studies. Anurag Deshpande, a first year PhD student, spent a year working at the European Space Agency (ESA), as a Young Graduate Trainee (YGT). With the application process for the next round of YGTs now open, he discusses his time working on the James Webb Space Telescope, how he found the experience, and how it continues to influence him in his PhD research.

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Non-parametric Cosmology with Cosmic Shear

Cosmology is in pretty bad shape; we don’t know what makes up 95% of the Universe. Galaxies spin too fast and the expansion of the Universe is unexpectedly accelerating. Cosmologists deal with this by inferring the existence of dark matter and dark energy. These form the backbone of the Lambda Cold Dark Matter (LCDM) model. The problem is that we have no physical explanation for the existence of these two components.

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