Search Publications
Accurate Distances to Important Spiral Galaxies: M63, M74, NGC 1291, NGC 4559, NGC 4625, and NGC 5398
Dolphin, Andrew E.; Skillman, Evan D.; Berg, Danielle +2 more
Accurate distances are fundamental for interpreting various measured properties of galaxies. Surprisingly, many of the best-studied spiral galaxies in the Local Volume have distance uncertainties that are much larger than can be achieved with modern observation techniques. Using Hubble Space Telescopeoptical imaging, we use the tip of the red gian…
The ISLAndS Project. II. The Lifetime Star Formation Histories of Six Andomeda dSphS
Ferguson, Henry C.; McQuinn, Kristen B. W.; Dolphin, Andrew E. +17 more
The Initial Star formation and Lifetimes of Andromeda Satellites (ISLAndS) project employs Hubble Space Telescope imaging to study a representative sample of six Andromeda dSph satellite companion galaxies. Our main goal is to determine whether the star formation histories (SFHs) of the Andromeda dSph satellites demonstrate significant statistical…
Search for sterile neutrinos in holographic dark energy cosmology: Reconciling Planck observation with the local measurement of the Hubble constant
Zhang, Jing-Fei; Zhang, Xin; He, Dong-Ze +1 more
We search for sterile neutrinos in the holographic dark energy cosmology by using the latest observational data. To perform the analysis, we employ the current cosmological observations, including the cosmic microwave background temperature power spectrum data from the Planck mission, the baryon acoustic oscillation measurements, the type Ia super…
Improved Dynamical Constraints on the Mass of the Central Black Hole in NGC 404
Williams, Benjamin F.; Caldwell, Nelson; Neumayer, Nadine +6 more
We explore the nucleus of the nearby 109 {M}⊙ early-type galaxy, NGC 404, using Hubble Space Telescope (HST)/STIS spectroscopy and WFC3 imaging. We first present evidence for nuclear variability in UV, optical, and infrared filters over a time period of 15 years. This variability adds to the already substantial evidence for …
Lyman continuum escape fraction of faint galaxies at z 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC
Ryan, R. E.; O'Connell, R. W.; Dickinson, M. +41 more
Context. The reionization of the Universe is one of the most important topics of present-day astrophysical research. The most plausible candidates for the reionization process are star-forming galaxies, which according to the predictions of the majority of the theoretical and semi-analytical models should dominate the H I ionizing background at z …
A Complete ALMA Map of the Fomalhaut Debris Disk
MacGregor, Meredith A.; Hughes, A. Meredith; Kalas, Paul +14 more
We present ALMA mosaic observations at 1.3 mm (223 GHz) of the Fomalhaut system with a sensitivity of 14 µJy/beam. These observations provide the first millimeter map of the continuum dust emission from the complete outer debris disk with uniform sensitivity, enabling the first conclusive detection of apocenter glow. We adopt an MCMC modelin…
Observational constraints on successful model of quintessential Inflation
Starobinsky, Alexei A.; Geng, Chao-Qiang; Lee, Chung-Chi +2 more
We study quintessential inflation using a generalized exponential potential V(phi)propto \exp(-λ phin/MPln), n>1, the model admits slow-roll inflation at early times and leads to close-to-scaling behaviour in the post inflationary era with an exit to dark energy at late times. We present detailed investigations …
The Tip of the Red Giant Branch Distances to Typa Ia Supernova Host Galaxies. V. NGC 3021, NGC 3370, and NGC 1309 and the Value of the Hubble Constant
Lee, Myung Gyoon; Jang, In Sung
We present final results of a program for the determination of the Hubble constant based on the calibration of the Type Ia supernovae (SNe Ia) using the Tip of the Red Giant Branch (TRGB). We report TRGB distances to three SN Ia host galaxies, NGC 3021, NGC 3370, and NGC 1309. We obtain F555W and F814W photometry of resolved stars from the archiva…
Optical, UV, and X-ray evidence for a 7-yr stellar cycle in Proxima Centauri
Drake, J. J.; Saar, S. H.; Kashyap, V. L. +2 more
Stars of stellar type later than about M3.5 are believed to be fully convective and therefore unable to support magnetic dynamos like the one that produces the 11-yr solar cycle. Because of their intrinsic faintness, very few late M stars have undergone long-term monitoring to test this prediction, which is critical to our understanding of magneti…
Occurrence of Radio Minihalos in a Mass-limited Sample of Galaxy Clusters
Clarke, Tracy E.; Giacintucci, Simona; Venturi, Tiziana +3 more
We investigate the occurrence of radio minihalos—diffuse radio sources of unknown origin observed in the cores of some galaxy clusters—in a statistical sample of 58 clusters drawn from the Planck Sunyaev-Zel’dovich cluster catalog using a mass cut (M 500 > 6 × 1014 M ⊙). We supplement our statistical sample with…