149 citations · 1.6k across the 58 of their papers we have counts for
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Formation and merging of Mass Gap Black Holes in Gravitational Wave Merger Events from Wide Hierarchical Quadruple Systems
Mohammadtaher Safarzadeh, Adrian S. Hamers, Abraham Loeb +1
We investigate secular evolution in hierarchical quadruple systems as a formation channel of mass-gap black holes (with masses of about ) in systems that will even…
LB-1 is inconsistent with the X-ray source population and pulsar-black hole binary searches in the Milky Way
Mohammadtaher Safarzadeh, Enrico Ramirez-Ruiz, Charles Kilpatrick
If confirmed, a wide binary system of 70 black hole (BH) and an 8 main sequence star (LB-1) is observed to reside in the Milky Way (MW). We show that long t…
LISA and the Existence of a Fast-Merging Double Neutron Star Formation Channel
Jeff J. Andrews, Katelyn Breivik, Chris Pankow +2
Using a Milky Way double neutron star (DNS) merger rate of 210 Myr, as derived by the Laser Interferometer Gravitational-Wave Observatory (LIGO), we demonstrate that the Las…
The Impact of metallicity evolution of the universe on the maximum mass of LIGO binary black holes
Mohammadtaher Safarzadeh, Will M. Farr
We can be biased against observing massive black holes to merge in the local universe as the bounds on the maximum black hole mass () depends on the assumptions r…
Ultra-light Dark Matter is Incompatible with the Milky Way's Dwarf Satellites
Mohammadtaher Safarzadeh, David N. Spergel
The density profiles of dwarf galaxies are a highly varied set. If the dark matter is an ultra-light particle such as axions, then simulations predict a distinctive and unique prof…
Measuring the delay time distribution of binary neutron stars. III. Using the individual star formation histories of gravitational wave event host galaxies in the local universe
Mohammadtaher Safarzadeh, Edo Berger, Joel Leja +1
In Paper I (Safarzadeh & Berger 2019) we studied the determination of the delay time distribution (DTD) of binary neutron stars (BNS) through scaling relations between halo/stellar…
Measuring the delay time distribution of binary neutron stars. II. Using the redshift distribution from third-generation gravitational wave detectors network
Mohammadtaher Safarzadeh, Edo Berger, Ken K. -Y. Ng +4
We investigate the ability of current and third-generation gravitational wave (GW) detectors to determine the delay time distribution (DTD) of binary neutron stars (BNS) through a…
Measuring the delay time distribution of binary neutron stars. I. Through Scaling Relations of the Host Galaxies of Gravitational Wave Events
Mohammadtaher Safarzadeh, Edo Berger
The delay time distribution of (DTD) of binary neutron stars (BNS) remains poorly constrained, mainly by the small known population of Galactic binaries, the properties of short ga…
Constraining a black hole companion for M87* through imaging by the Event Horizon Telescope
Mohammadtaher Safarzadeh, Abraham Loeb, Mark Reid
The Event Horizon Telescope (EHT), a global very long baseline interferometric array observing at a wavelength of 1.3 mm, detected the first image of the M87 supermassive black hol…
Explaining the enhanced star formation rate of Jellyfish galaxies in galaxy clusters
Mohammadtaher Safarzadeh, Abraham Loeb
We study the recently observed JellyFish galaxies (JFGs), which are found to have their gas content ram-pressure stripped away in galaxy clusters. These galaxies are observed to ha…
Multi-Messenger Astronomy with Extremely Large Telescopes
Ryan Chornock, Philip S. Cowperthwaite, Raffaella Margutti +82
The field of time-domain astrophysics has entered the era of Multi-messenger Astronomy (MMA). One key science goal for the next decade (and beyond) will be to characterize gravitat…
An upper limit on primordial magnetic fields from ultra-faint dwarf galaxies
Mohammadtaher Safarzadeh, Abraham Loeb
The presence of primordial magnetic fields increases the minimum halo mass in which star formation is possible at high redshifts. Estimates of the dynamical mass of ultra-faint dwa…