527 citations · 2.4k across the 27 of their papers we have counts for
27 papers
A Fast-cadenced Search for Gamma-Ray Burst Orphan Afterglows with the Deeper, Wider, Faster Programme
James Freeburn, Jeff Cooke, Anais Möller +11
The relativistic outflows that produce Long GRBs (LGRBs) can be described by a structured jet model where prompt -ray emission is restricted to a narrow region in the jet's core…
FLIMFLAM DR1: The First Constraints on the Cosmic Baryon Distribution from 8 FRB sightlines
Ilya S. Khrykin, Metin Ata, Khee-Gan Lee +15
The dispersion measure of fast radio bursts (FRBs), arising from the interactions of the pulses with free electrons along the propagation path, constitutes a unique probe of the co…
A Recipe for Unbiased Background Modeling in Deep Wide-Field Astronomical Images
Qing Liu, Roberto G. Abraham, Peter G. Martin +9
Unbiased sky background modeling is crucial for the analysis of deep wide-field images, but it remains a major challenge in low surface brightness astronomy. Traditional image proc…
The FRB20190520B Sightline Intersects Foreground Galaxy Clusters
Khee-Gan Lee, Ilya S. Khrykin, Sunil Simha +7
The repeating fast radio burst FRB20190520B is an anomaly of the FRB population thanks to its high dispersion measure (DMpc/cc) despite its low redshift of $z_\mathrm{frb}…
Joint Modelling of Dust Scattering and Thermal Emission: The Spider Complex
Jielai Zhang, Peter G Martin, Ryan Cloutier +4
Observations across the electromagnetic spectrum of radiative processes involving interstellar dust -- emission, extinction, and scattering -- are used to constrain the parameters…
A giant shell of ionized gas discovered near M82 with the Dragonfly Spectral Line Mapper pathfinder
Deborah Lokhorst, Roberto Abraham, Imad Pasha +8
We present the discovery of a giant cloud of ionized gas in the field of the starbursting galaxy M82. Emission from the cloud is seen in H and [NII]6583 in data obtained thou…
A Nascent Tidal Dwarf Galaxy Forming within the Northern HI Streamer of M82
Imad Pasha, Deborah Lokhorst, Pieter G. van Dokkum +12
We identify a 600 pc-wide region of active star formation located within a tidal streamer of M82 via emission ( erg s cm), us…
A Method To Characterize the Wide-Angle Point Spread Function of Astronomical Images
Qing Liu, Roberto Abraham, Colleen Gilhuly +14
Uncertainty in the wide-angle Point Spread Function (PSF) at large angles (tens of arcseconds and beyond) is one of the dominant sources of error in a number of important quantitie…
Finding Fast Transients in Real Time Using Novel Light Curve Analysis Algorithm
Robert Strausbaugh, Antonino Cucchiara, Michael Dow +4
The current data acquisition rate of astronomical transient surveys and the promise for significantly higher rates during in the next decade necessitate the development of novel ap…
Constraining the Cosmic Baryon Distribution with Fast Radio Burst Foreground Mapping
Khee-Gan Lee, Metin Ata, Ilya S. Khrykin +5
The dispersion measures (DM) of fast radio bursts (FRBs) encode the integrated electron density along the line-of-sight, which is typically dominated by the intergalactic medium (I…
The Dragonfly Wide Field Survey. I. Telescope, Survey Design and Data Characterization
Shany Danieli, Deborah Lokhorst, Jielai Zhang +11
We present a description of the Dragonfly Wide Field Survey (DWFS), a deep photometric survey of a wide area of sky. The DWFS covers 330 in the equatorial GAMA fie…
Does the galaxy NGC1052-DF2 falsify Milgromian dynamics?
Pavel Kroupa, Hosein Haghi, Behnam Javanmardi +6
A great challenge in present-day physics is to understand whether the observed internal dynamics of galaxies is due to dark matter matter or due to a modification of the law of gra…
Spectroscopic Constraints on the Build-up of the Intracluster Light in the Coma Cluster
Meng Gu, Charlie Conroy, David Law +13
The stellar content of the intracluster light (ICL) provides unique insight into the hierarchical assembly process of galaxy clusters.However, the ICL is difficult to study due to…
The Dragonfly Nearby Galaxies Survey. V. HST/ACS Observations of 23 Low Surface Brightness Objects in the Fields of NGC1052, NGC1084, M96, and NGC4258
Yotam Cohen, Pieter van Dokkum, Shany Danieli +8
We present HST/ACS imaging of twenty-three very low surface brightness (=25-27.5) galaxies detected in the fields of four nearby galaxy groups. These objects were selected…
A Revised Velocity for the Globular Cluster GC-98 in the Ultra Diffuse Galaxy NGC1052-DF2
Pieter van Dokkum, Yotam Cohen, Shany Danieli +9
We recently published velocity measurements of luminous globular clusters in the galaxy NGC1052-DF2, concluding that it lies far off the canonical stellar mass - halo mass relation…
The Maybe Stream: A Possible Cold Stellar Stream in the Ultra-Diffuse Galaxy NGC1052-DF2
Roberto Abraham, Shany Danieli, Pieter van Dokkum +10
We report tentative evidence for a cold stellar stream in the ultra-diffuse galaxy NGC1052-DF2. If confirmed, this stream (which we refer to as "The Maybe Stream") would be the fir…
An enigmatic population of luminous globular clusters in a galaxy lacking dark matter
Pieter van Dokkum, Yotam Cohen, Shany Danieli +10
We recently found an ultra diffuse galaxy (UDG) with a half-light radius of R_e = 2.2 kpc and little or no dark matter. The total mass of NGC1052-DF2 was measured from the radial v…
A galaxy lacking dark matter
Pieter van Dokkum, Shany Danieli, Yotam Cohen +9
Studies of galaxy surveys in the context of the cold dark matter paradigm have shown that the mass of the dark matter halo and the total stellar mass are coupled through a function…
Low Metallicities and Old Ages for Three Ultra-Diffuse Galaxies in the Coma Cluster
Meng Gu, Charlie Conroy, David Law +17
A large population of ultra-diffuse galaxies (UDGs) was recently discovered in the Coma cluster. Here we present optical spectra of three such UDGs, DF7, DF44 and DF17, which have…
Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
Pieter van Dokkum, Roberto Abraham, Aaron J. Romanowsky +7
We present Hubble Space Telescope imaging of two ultra diffuse galaxies (UDGs) with measured stellar velocity dispersions in the Coma cluster. The galaxies, Dragonfly 44 and DFX1,…
The Dragonfly Nearby Galaxies Survey. III. The Luminosity Function of the M101 Group
Shany Danieli, Pieter van Dokkum, Allison Merritt +4
We obtained follow-up HST observations of the seven low surface brightness galaxies discovered with the Dragonfly Telephoto Array in the field of the massive spiral galaxy M101. Ou…
Future Prospects: Deep Imaging of Galaxy Outskirts using Telescopes Large and Small
Roberto Abraham, Pieter van Dokkum, Charlie Conroy +5
The Universe is almost totally unexplored at low surface brightness levels. In spite of great progress in the construction of large telescopes and improvements in the sensitivity o…
The Dragonfly Nearby Galaxies Survey. II. Ultra diffuse galaxies near the elliptical galaxy NGC 5485
Allison Merritt, Pieter van Dokkum, Shany Danieli +4
We present the unexpected discovery of four ultra diffuse galaxies (UDGs) in a group environment. We recently identified seven extremely low surface brightness galaxies in the vici…
A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44
Pieter van Dokkum, Roberto Abraham, Jean Brodie +6
Recently a population of large, very low surface brightness, spheroidal galaxies was identified in the Coma cluster. The apparent survival of these Ultra Diffuse Galaxies (UDGs) in…