15-16 Mar 2017

  • (abs, pdf) Iršič et al., First constraints on fuzzy dark matter from Lyman-$\alpha$ forest data and hydrodynamical simulations
  • (abs, pdf) Qin et al., Dark-ages Reionization and Galaxy Formation Simulation X. The small contribution of quasars to reionization
  • (abs, pdf) Leisman et al., (Almost) Dark Galaxies in the ALFALFA Survey: Isolated HI Bearing Ultra Diffuse Galaxies
  • (abs, pdf) Pope et al., Early Science with the Large Millimeter Telescope: Detection of dust emission in multiple images of a normal galaxy at $z>4$ lensed by a Frontier Fields cluster
  • (abs, pdf) Rodriguez-Puebla et al., The Galaxy-Halo Connection Over The Last 13.3 Gyrs

New Paper: Massive Black Hole Formation

Yesterday, our paper (free arXiv link), led by John Regan at the Dublin City University, on the formation of massive black holes in the early universe was published in Nature Astronomy. We investigated the “close-pair scenario” where a nearby nascent galaxy shines on a pre-galactic cloud, which destroys most of its molecular hydrogen that is a crucial ingredient in forming stars. Without this catalyst, the gas cloud cannot form stars, but it proceeds to collapse into a single massive black hole without fragmenting into stars.  Its mass is on the order of 100,000 times the mass of the Sun.

We simulated both this radiation source and the collapsing gas cloud to find the necessary conditions for such an object to form. We performed tens of simulations investigating various separations, orbital parameters, and galaxy luminosities. We found that a particular set of conditions, such as distance and synchronization of the onset of the formation of the first stars and galaxies, are needed to prompt this pathway toward forming supermassive black holes (one billion times the mass of our Sun!) observed only a billion years after the Big Bang.

14 Mar 2017

  • (abs, pdf) Regan et al., Rapid Formation of Massive Black Holes in close proximity to Embryonic Proto-Galaxies
  • (abs, pdf) DeFelippis et al., The Impact of Galactic Winds on the Angular Momentum of Disk Galaxies in the Illustris Simulation
  • (abs, pdf) Valiante et al., On the formation of the first quasars
  • (abs, pdf) Butler et al., Kiloparsec-Scale Simulations of Star Formation in Disk Galaxies. IV. Regulation of Galactic Star Formation Rates by Stellar Feedback

09 Mar 2017

  • (abs, pdf) Eilers et al., Implications of $z \sim 6$ Quasar Proximity Zones for the Epoch of Reionization and Quasar Lifetimes
  • (abs, pdf) Elbert et al., Counting Black Holes: The Cosmic Stellar Remnant Population and Implications for LIGO
  • (abs, pdf) Mas-Ribas et al., Small-scale Intensity Mapping: Extended Ly$\alpha$, H$\alpha$ and Continuum emission as a Probe of Halo Star Formation in High-redshift Galaxies
  • (abs, pdf) Dopita & Sutherland, Effects of Pre-ionisation in Radiative Shocks II: Application to the Herbig-Haro Objects
  • (abs, pdf) Ceverino et al., Introducing the FirstLight project: UV luminosity function and scaling relations of primeval galaxies

08 Mar 2017

  • (abs, pdf) Laporte et al., Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy
  • (abs, pdf) Ding et al., H0LiCOW VII. Cosmic evolution of the correlation between black hole mass and host galaxy luminosity
  • (abs, pdf) Kadowaki et al., Spectroscopy of Ultra-diffuse Galaxies in the Coma Cluster
  • (abs, pdf) Vanzella et al., Magnifying the early episodes of star formation: super-star clusters at cosmological distances
  • (abs, pdf) Ota et al., A New Constraint on Reionization by a Census of $z=7.0$ Ly$\alpha$ Emitters with a Deep and Large Sample to 0.3 $L^*$: Evolution of Ly$\alpha$ Luminosity Function and Equivalent Width at $z\sim6-7$
  • (abs, pdf) Merritt, Cosmology and Convention