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10 papers · 2 filters
Accretion from Winds of Red Giant Branch Stars May Reveal the Supermassive Black Hole in Leo I
Fabio Pacucci, Abraham Loeb
A supermassive black hole (SMBH) of was recently detected via dynamical measurements at the center of the dwarf galaxy Leo I. Standing o…
The Two Galaxy Candidates HD1 and HD2 Are Likely Not Lensed
Rui Zhe Lee, Fabio Pacucci, Priyamvada Natarajan +1
The discovery of two UV-bright galaxy candidates at , HD1 and HD2, laid the foundation for a new race to study the early Universe. Previous investigations suggested that…
Metallicity Ceiling in Quasars from Recycled Stellar Winds
Shelley J. Cheng, Abraham Loeb
Context: Optically luminous quasars are metal rich across all redshifts. Surprisingly, there is no significant trend in the broad-line region (BLR) metallicity with different star…
Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at Shows No Evidence of Lensing
Fabio Pacucci, Adi Foord, Lucia Gordon +1
More than quasars have been detected so far at , with only one showing clear signs of strong gravitational lensing. Some studies call for a missing population of lense…
Implication of spin constraints by the Event Horizon Telescope on stellar orbits in the Galactic Center
Giacomo Fragione, Abraham Loeb
The center of the Milky Way hosts the closest supermassive black hole, SgrA. Decades of near-infrared observations of our Galactic Center have shown the presence of a small pop…
Galactic Kites
Abraham Loeb
I show that interstellar films of material thinner than a micron, drift away from the Galactic plane as a result of stellar radiation pressure. Such films, whether produced natural…
Signatures of supermassive black hole binaries on maser systems
Hamsa Padmanabhan, Abraham Loeb
We illustrate a novel signature of black hole binaries from their effect on the kinematics of water maser emission in their environments. With the help of simulations, we establish…
Spurious Radial Migration from Relativistic Effects in the Milky-Way Disk
Abraham Loeb
The gradient of the gravitational redshift in the potential of the Milky-Way induces an apparent spurious radial migration. I show that this effect is simply related to the local a…
Measuring the Expansion or Contraction of Galaxies
Abraham Loeb
Galaxies lose mass as a result of their luminosity or gaseous outflows. I calculate the resulting radial migration of stars outwards and show that it could potentially be measured…
Are the Newly-Discovered Drop-out Sources Starburst Galaxies or Quasars?
Fabio Pacucci, Pratika Dayal, Yuichi Harikane +2
The detection of two galaxy candidates has opened a new window on galaxy formation at an era only Myr after the Big Bang. Here, we investigate the physical nature…