Anna Rosen

Anna Rosen has written 17 posts for astrobites

Probing the Ionization Rate of Molecular Hydrogen Near the Galactic Center

In this article, the authors measure the cosmic ray ionization rate within a few parsecs of the galactic center. They find that the cosmic ray ionization rate is an order of magnitude larger than the galactic standard and also that the molecular gas near the galactic center is much warmer than the typical galactic molecular cloud.

The Infamous Galactic Center Source G2: Gas Cloud or Star?

In this paper, the authors use near-IR imaging and spectroscopy to determine if G2, a galactic center source about to approach our galaxy’s supermassive black hole, is a gas cloud or a star.

Tracking the Chemical Evolution of Galaxies Over the Last 11 Billion Years

In this article, the authors measure the stellar mass-metallicity relation for star forming galaxies ranging to z~2.3. They find that mass-metallicity relationship for these galaxies evolves with time and also that it flattens at late times.

The Importance of Optically Thick Disks Around Massive Stars

In this article, the authors study the effects of an optically thick disk around a forming massive protostar and examine how treating the gas opacity in the innermost dust-free region correctly affects the overall formation of massive stars.

Observational Signatures of Accretion Induced Collapse of White Dwarfs

A massive white dwarf accreting from a companion can lead to accretion induced collapse turning the white dwarf into a neutron star – how can such an event be observed?

The Serendipitous Discovery of Two Stellar Mass Black Holes in the Globular Cluster M22

In this article, the authors report their serendipitous discovery of two stellar mass-black holes in the globular cluster M22, however theoretical work predicts that there should only be one stellar-mass black hole!

A Novel Approach of Determining the Mass-loss Rates of Massive Stars

These authors describe a novel method to determine the mass-loss rates of massive runaway stars.

Examining the Fate of White Dwarf Companions

What happens to a low-mass companion when a star evolves off the main sequence to become a white dwarf?

Understanding the Dynamical State of Globular Clusters

Globular clusters are some of the most massive and densest star clusters observed. What are the progenitors of old globular clusters that we see orbiting the Milky Way and other galaxies? What evolutionary and dynamical effects have these clusters experienced? What determines the physical properties of old globular clusters? Why are there two “distinct” classes of globular clusters and what properties determine these physical states? These are the questions the authors aim to answer.

Runaway Stars in High-Redshift Galaxies: A Solution to the Reionization Problem?

Can the ionizing radiation from massive run-away stars be a leading source of reionization in the early universe?

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