Search Publications
Detection of Equatorward Meridional Flow and Evidence of Double-cell Meridional Circulation inside the Sun
Kosovichev, A. G.; Zhao, Junwei; Duvall, T. L., Jr. +2 more
Meridional flow in the solar interior plays an important role in redistributing angular momentum and transporting magnetic flux inside the Sun. Although it has long been recognized that the meridional flow is predominantly poleward at the Sun's surface and in its shallow interior, the location of the equatorward return flow and the meridional flow…
Newly Quenched Galaxies as the Cause for the Apparent Evolution in Average Size of the Population
Ilbert, O.; Taniguchi, Y.; Capak, P. +10 more
We use the large COSMOS sample of galaxies to study in an internally self-consistent way the change in the number densities of quenched early-type galaxies (Q-ETGs) of a given size over the redshift interval 0.2 < z < 1 in order to study the claimed size evolution of these galaxies. In a stellar mass bin at 1010.5 < M gala…
How to Distinguish between Cloudy Mini-Neptunes and Water/Volatile-dominated Super-Earths
Seager, Sara; Benneke, Björn
One of the most profound questions about the newly discovered class of low-density super-Earths is whether these exoplanets are predominately H2-dominated mini-Neptunes or volatile-rich worlds with gas envelopes dominated by H2O, CO2, CO, CH4, or N2. Transit observations of the super-Earth GJ …
Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-line Spectroscopy
Savage, Blair D.; Shull, J. Michael; Danforth, Charles W. +5 more
The circumgalactic medium (CGM) of late-type galaxies is characterized using UV spectroscopy of 11 targeted QSO/galaxy pairs at z <= 0.02 with the Hubble Space Telescope Cosmic Origins Spectrograph (COS) and ~60 serendipitous absorber/galaxy pairs at z <= 0.2 with the Space Telescope Imaging Spectrograph. CGM warm cloud properties are derive…
The UV Luminosity Function of Star-forming Galaxies via Dropout Selection at Redshifts z ~ 7 and 8 from the 2012 Ultra Deep Field Campaign
Ono, Yoshiaki; Ouchi, Masami; Stark, Daniel P. +13 more
We present a catalog of high-redshift star-forming galaxies selected to lie within the redshift range z ~= 7-8 using the Ultra Deep Field 2012 (UDF12), the deepest near-infrared (near-IR) exposures yet taken with the Hubble Space Telescope (HST). As a result of the increased near-IR exposure time compared to previous HST imaging in this field, we …
The Assembly of Milky-Way-like Galaxies Since z ~ 2.5
van Dokkum, Pieter G.; Franx, Marijn; Labbé, Ivo +16 more
Galaxies with the mass of the Milky Way dominate the stellar mass density of the universe but it is uncertain how and when they were assembled. Here we study progenitors of these galaxies out to z = 2.5, using data from the 3D-HST and CANDELS Treasury surveys. We find that galaxies with present-day stellar masses of log (M) ≈ 10.7 built ~90% of th…
Compositional Diversity in the Atmospheres of Hot Neptunes, with Application to GJ 436b
Fortney, J. J.; Moses, J. I.; Madhusudhan, N. +6 more
Neptune-sized extrasolar planets that orbit relatively close to their host stars—often called "hot Neptunes"—are common within the known population of exoplanets and planetary candidates. Similar to our own Uranus and Neptune, inefficient accretion of nebular gas is expected produce hot Neptunes whose masses are dominated by elements heavier than …
Dust Extinction from Balmer Decrements of Star-forming Galaxies at 0.75 <= z <= 1.5 with Hubble Space Telescope/Wide-Field-Camera 3 Spectroscopy from the WFC3 Infrared Spectroscopic Parallel Survey
Scarlata, C.; Malkan, M.; Hathi, N. P. +14 more
Spectroscopic observations of Hα and Hβ emission lines of 128 star-forming galaxies in the redshift range 0.75 <= z <= 1.5 are presented. These data were taken with slitless spectroscopy using the G102 and G141 grisms of the Wide-Field-Camera 3 (WFC3) on board the Hubble Space Telescope as part of the WFC3 Infrared Spectroscopic Parallel sur…
A CANDELS-3D-HST synergy: Resolved Star Formation Patterns at 0.7 < z < 1.5
Ferguson, Henry C.; Grogin, Norman A.; Kocevski, Dale D. +20 more
We analyze the resolved stellar populations of 473 massive star-forming galaxies at 0.7 < z < 1.5, with multi-wavelength broadband imaging from CANDELS and Hα surface brightness profiles at the same kiloparsec resolution from 3D-HST. Together, this unique data set sheds light on how the assembled stellar mass is distributed within galaxies, …
The PdBI Arcsecond Whirlpool Survey (PAWS). I. A Cloud-scale/Multi-wavelength View of the Interstellar Medium in a Grand-design Spiral Galaxy
Leroy, Adam K.; Meidt, Sharon E.; Hughes, Annie +10 more
The Plateau de Bure Interferometer Arcsecond Whirlpool Survey has mapped the molecular gas in the central ~9 kpc of M51 in its 12CO(1-0) line emission at a cloud-scale resolution of ~40 pc using both IRAM telescopes. We utilize this data set to quantitatively characterize the relation of molecular gas (or CO emission) to other tracers o…