Search Publications
Evaluating Rotation Periods of M Dwarfs across the Ages
Angus, Ruth; Kiman, Rocio; Faherty, Jacqueline K. +5 more
In this work we examine M dwarf rotation rates at a range of ages to establish benchmarks for M dwarf gyrochronology. This work includes a sample of 713 spectroscopically classified M0-M8 dwarfs with new rotation rates measured from K2 light curves. We analyze data and recover rotation rates for 179 of these objects. We add these to rotation rates…
A Dynamical Measurement of the Disk Mass in Elias 227
Testi, Leonardo; Lodato, Giuseppe; Pérez, Laura M. +4 more
Recent multi-wavelength Atacama Large Millimeter/submillimeter Array (ALMA) observations of the protoplanetary disk orbiting around Elias 227 revealed a two-armed spiral structure. The observed morphology, together with the young age of the star and the disk-to-star mass ratio estimated from dust-continuum emission, make this system a perfect labo…
ALMA Lensing Cluster Survey: Bright [C II] 158 µm Lines from a Multiply Imaged Sub-L⋆ Galaxy at z = 6.0719
Ono, Yoshiaki; Ouchi, Masami; Richard, Johan +31 more
We present bright [C II] 158 µm line detections from a strongly magnified and multiply imaged (µ ∼ 20-160) sub-L* ( ${M}_{\mathrm{UV}}=-{19.75}_{-0.44}^{+0.55}$ ) Lyman-break galaxy (LBG) at z = 6.0719 ± 0.0004, drawn from the ALMA Lensing Cluster Survey (ALCS). Emission lines are identified at 268.7 GHz at ≥8σ exactly at th…
The Per-Tau Shell: A Giant Star-forming Spherical Shell Revealed by 3D Dust Observations
Alves, João; Zucker, Catherine; Goodman, Alyssa +6 more
A major question in the field of star formation is how molecular clouds form out of the diffuse interstellar medium (ISM). Recent advances in 3D dust mapping are revolutionizing our view of the structure of the ISM. Using the highest-resolution 3D dust map to date, we explore the structure of a nearby star-forming region, which includes the well-k…
Eridanus II: A Fossil from Reionization with an Off-center Star Cluster
Brown, Thomas M.; Strader, Jay; Geha, Marla +10 more
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of MV = -7.1, is located at a distance of 339 kpc, just beyond the virial radius of the Milky Way. We determine the star formation history of Eri II and measure the structure of the galaxy…
On the Observational Difference between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei
Brandt, W. N.; Luo, B.; Gallagher, S. C. +5 more
We present a systematic X-ray and multiwavelength study of a sample of 47 active galactic nuclei (AGNs) with reverberation mapping measurements. This sample includes 21 super-Eddington accreting AGNs and 26 sub-Eddington accreting AGNs. Using high-state observations with simultaneous X-ray and UV/optical measurements, we investigate whether super-…
Does the Magnetic Field Suppress Fragmentation in Massive Dense Cores?
Ching, Tao-Chung; Qiu, Keping; Chen, Huei-Ru Vivien +15 more
Theoretical and numerical works indicate that a strong magnetic field should suppress fragmentation in dense cores. However, this has never been tested observationally in a relatively large sample of fragmenting massive dense cores. Here, we use the polarization data obtained in the Submillimeter Array Legacy Survey of Zhang et al. to build a samp…
X-Ray Superflares from Pre-main-sequence Stars: Flare Energetics and Frequency
Feigelson, Eric D.; Getman, Konstantin V.
Solar-type stars exhibit their highest levels of magnetic activity during their early convective pre-main-sequence (PMS) phase of evolution. The most powerful PMS flares, superflares and megaflares, have peak X-ray luminosities of $\mathrm{log}({L}_{{\rm{X}}})=30.5\mbox{-}34.0$ erg s-1 and total energies $\mathrm{log}({E}_{{\rm{X}}})=34…
Galaxy Evolution in All Five CANDELS Fields and IllustrisTNG: Morphological, Structural, and the Major Merger Evolution to z 3
Conselice, C. J.; Duncan, K.; Whitney, A. +1 more
A fundamental feature of galaxies is their structure, yet we are just now understanding the evolution of structural properties in quantitative ways. As such, we explore the quantitative nonparametric structural evolution of 16,778 galaxies up to z ~ 3 in all five CANDELS fields, the largest collection of high-resolution images of distant galaxies …
Systematic Difference between Ionized and Molecular Gas Velocity Dispersions in z ∼ 1-2 Disks and Local Analogs
Bolatto, A. D.; Fisher, D. B.; Glazebrook, K. +7 more
We compare the molecular and ionized gas velocity dispersions of nine nearby turbulent disks, analogs to high-redshift galaxies, from the DYNAMO sample using new Atacama Large Millimeter/submillimeter Array and GMOS/Gemini observations. We combine our sample with 12 galaxies at z ∼ 0.5-2.5 from the literature. We find that the resolved velocity di…