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The LEGA-C of nature and nurture in stellar populations of galaxies at z~0.6-1.0: D4000 and H-delta reveal different assembly histories for quiescent galaxies in different environments
David Sobral, Arjen van der Wel, Rachel Bezanson +11
Galaxy evolution is driven by a variety of physical processes which are predicted to proceed at different rates for different dark matter haloes and environments across cosmic time…
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…
Sizes of Lensed Lower-luminosity z=4-8 Galaxies from the Hubble Frontier Field Program
R. J. Bouwens, G. D. Illingworth, P. G. van Dokkum +3
We constrain the rest-UV size-luminosity relation for star-forming galaxies at z~4 and z~6, 7, and 8 identified behind clusters from the Hubble Frontier Fields (HFF) program. The s…
NGC5846-UDG1: A galaxy formed mostly by star formation in massive, extremely dense clumps of gas
Shany Danieli, Pieter van Dokkum, Sebastian Trujillo-Gomez +10
It has been shown that ultra-diffuse galaxies (UDGs) have higher specific frequencies of globular clusters on average than other dwarf galaxies with similar luminosities. The UDG N…
Diagnosing DASH: A Catalog of Structural Properties for the COSMOS-DASH Survey
Sam E. Cutler, Katherine E. Whitaker, Lamiya A. Mowla +16
We present the morphological catalogs for the COSMOS-DASH survey, the largest area near-IR survey using HST-WFC3 to date. Utilizing the "Drift And SHift" observing techni…
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…
The Spitzer/IRAC Legacy over the GOODS Fields: Full-Depth 3.6, 4.5, 5.8 and 8.0um Mosaics and Photometry for > 9000 Galaxies at z~3.5-10 from the GOODS Re-ionization Era wide-Area Treasury from Spitzer (GREATS)
Mauro Stefanon, Ivo Labbé, Pascal A. Oesch +9
We present the deepest Spitzer/IRAC , , and m wide-area mosaics yet over the GOODS-N and GOODS-S fields as part of the GOODS Re-ionization Era wide-Area Treas…
A New Census of the 0.2< z <3.0 Universe, Part II: The Star-Forming Sequence
Joel Leja, Joshua S. Speagle, Yuan-Sen Ting +6
We use the panchromatic SED-fitting code Prospector to measure the galaxy logM-logSFR relationship (the `star-forming sequence') across using the COSMOS-2015 an…
Variation in the stellar initial mass function from the chromospheric activity of M dwarfs in early-type galaxies
Pieter van Dokkum, Charlie Conroy
Mass measurements and absorption line studies indicate that the stellar initial mass function (IMF) is bottom-heavy in the central regions of many early-type galaxies, with an exce…
Bayesian fitting of multi-Gaussian expansion models to galaxy images
Tim B. Miller, Pieter van Dokkum
Fitting parameterized models to images of galaxies has become the standard for measuring galaxy morphology. This forward modelling technique allows one to account for the PSF to ef…
Tidal Distortions in NGC1052-DF2 and NGC1052-DF4: Independent Evidence for a Lack of Dark Matter
Michael A. Keim, Pieter van Dokkum, Shany Danieli +11
Two ultra diffuse galaxies in the same group, NGC1052-DF2 and NGC1052-DF4, have been found to have little or no dark matter and to host unusually luminous globular cluster populati…
The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release 3: 3000 High-Quality Spectra of -selected galaxies at
Arjen van der Wel, Rachel Bezanson, Francesco D'Eugenio +19
We present the third and final data release of the Large Early Galaxy Astrophysics Census (LEGA-C), an ESO/VLT public spectroscopic survey targeting , Ks-selected ga…
Low-luminosity galaxies in the early universe have observed sizes similar to star cluster complexes
R. J. Bouwens, G. D. Illingworth, P. G. van Dokkum +3
We compare the sizes and luminosities of faint -8 galaxies magnified by the Hubble Frontier Fields (HFF) clusters with star-forming regions, as well as more evolved objects, i…
A Tip of the Red Giant Branch Distance of Mpc to the Dark Matter Deficient Galaxy NGC1052-DF2 from 40 Orbits of Hubble Space Telescope Imaging
Zili Shen, Shany Danieli, Pieter van Dokkum +7
The large and diffuse galaxies NGC1052-DF2 and NGC1052-DF4 have been found to have very low dark matter content and a population of luminous globular clusters. Accurate distance me…
A recently quenched isolated dwarf galaxy outside of the Local Group environment
Ava Polzin, Pieter van Dokkum, Shany Danieli +2
We report the serendipitous identification of a low mass (), isolated, likely quenched dwarf galaxy in the "foreground" of the COSMOS-CAN…
On the Random Motion of Nuclear Objects in a Fuzzy Dark Matter Halo
Dhruba Dutta Chowdhury, Frank C. van den Bosch, Victor H. Robles +4
Fuzzy Dark Matter (FDM), consisting of ultralight bosons (), is an intriguing alternative to Cold Dark Matter. Numerical simulations that solve the…
Blue Rest-Frame UV-Optical Colors in z~8 Galaxies from GREATS: Very Young Stellar Populations at ~650 Myr of Cosmic Time
Mauro Stefanon, Rychard J. Bouwens, Ivo Labbé +4
Deep rest-optical observations are required to accurately constrain the stellar populations of galaxies. Due to significant limitations in the availability of such data fo…
The Geometry of Cold, Metal-Enriched Gas Around Galaxies at
Britt F. Lundgren, Samantha Creech, Gabriel Brammer +10
We present the first results from a Hubble Space Telescope WFC3/IR program, which obtained direct imaging and grism observations of galaxies near quasar sightlines with a high freq…
Fast, Slow, Early, Late: Quenching Massive Galaxies at z~0.8
Sandro Tacchella, Charlie Conroy, S. M. Faber +14
We investigate the stellar populations for a sample of 161 massive, mainly quiescent galaxies at with deep Keck/DEIMOS rest-frame optical spectros…
Spatially Resolved Stellar Spectroscopy of the Ultra-diffuse Galaxy Dragonfly 44. III. Evidence for an Unexpected Star-Formation History
Alexa Villaume, Aaron J. Romanowsky, Jean Brodie +6
We use the Keck Cosmic Web Imager integral-field unit spectrograph to: 1) measure the global stellar population parameters for the ultra-diffuse galaxy (UDG) Dragonfly 44 (DF44) to…