Search Publications
Stellar Mass-Gas-phase Metallicity Relation at 0.5 ≤ z ≤ 0.7: A Power Law with Increasing Scatter toward the Low-mass Regime
Barro, Guillermo; Pérez-González, Pablo G.; Hathi, Nimish P. +21 more
We present the stellar mass ({M}*)-gas-phase metallicity relation (MZR) and its scatter at intermediate redshifts (0.5≤slant z≤slant 0.7) for 1381 field galaxies collected from deep spectroscopic surveys. The star formation rate (SFR) and color at a given {M}* of this magnitude-limited (R≲ 24 AB) sample are representative of …
Transition Region and Chromospheric Signatures of Impulsive Heating Events. I. Observations
Warren, Harry P.; Crump, Nicholas A.; Reep, Jeffrey W. +1 more
We exploit the high spatial resolution and high cadence of the Interface Region Imaging Spectrograph (IRIS) to investigate the response of the transition region and chromosphere to energy deposition during a small flare. Simultaneous observations from the Reuven Ramaty High Energy Solar Spectroscopic Imager provide constraints on the energetic ele…
The Total Solar Irradiance Climate Data Record
Dewitte, Steven; Nevens, Stijn
We present the composite measurements of total solar irradiance (TSI) as measured by an ensemble of space instruments. The measurements of the individual instruments are put on a common absolute scale, and their quality is assessed by intercomparison. The composite time series is the average of all available measurements. From 1984 April to the pr…
Physical Properties of Spectroscopically Confirmed Galaxies at z ≥ 6. III. Stellar Populations from SED Modeling with Secure Lyα Emission and Redshifts
Ouchi, Masami; Shimasaku, Kazuhiro; Fan, Xiaohui +9 more
We present a study of stellar populations in a sample of spectroscopically confirmed Lyman-break galaxies (LBGs) and Lyα emitters (LAEs) at 5.7< z< 7. These galaxies have deep images from Subaru, the Hubble Space Telescope, and Spitzer/IRAC. We focus on 27 galaxies with IRAC detections, and characterize their stellar populations based on the…
A Hubble Space Telescope Study of the Enigmatic Milky Way Halo Globular Cluster Crater*
Dolphin, Andrew E.; Sills, Alison; Belokurov, Vasily +6 more
We analyze the resolved stellar populations of the faint stellar system, Crater, based on deep optical imaging taken with the Advanced Camera for Surveys on the Hubble Space Telescope. Crater’s color-magnitude diagram (CMD) extends ∼4 mag below the oldest main-sequence (MS) turnoff. Structurally, we find that Crater has a half-light radius of ∼20 …
NuSTAR and XMM-Newton Observations of the Neutron Star X-Ray Binary 1RXS J180408.9-34205
Harrison, F. A.; Fabian, A. C.; Miller, J. M. +8 more
We report on observations of the neutron star (NS) residing in the low-mass X-ray binary 1RXS J180408.9-34205 taken 2015 March by NuSTAR and XMM-Newton while the source was in the hard spectral state. We find multiple reflection features (Fe {{{K}}}α detected with NuSTAR; N vii, O vii, and O viii detected in the RGS) from different ion…
Acetylene on Titan’s Surface
Le Mouélic, S.; Cornet, T.; Rodriguez, S. +6 more
Titan’s atmosphere is opaque in the near-infrared due to gaseous absorptions, mainly by methane, and scattering by aerosols, except in a few “transparency windows.” Thus, the composition of Titan’s surface remains difficult to access from space and is still poorly constrained. Photochemical models suggest that most of the organic compounds formed …
New Parallaxes and a Convergence Analysis for the TW Hya Association
Faherty, J. K.; Weinberger, A. J.; Gagné, J. +3 more
The TW Hya Association (TWA) is a nearby stellar association with an age of ∼5-10 Myr. This is an important age for studying the late stages of star and planet formation. We measure the parallaxes of 14 candidate members of TWA. That brings to 38 the total number of individual stars with fully measured kinematics, I.e., proper motion, radial veloc…
Distributions of Quasar Hosts on the Galaxy Main Sequence Plane
Rieke, George H.; Shi, Yong; Zhang, Zhoujian +4 more
The relation between star formation rates (SFRs) and stellar masses, I.e., the galaxy main sequence, is a useful diagnostic of galaxy evolution. We present the distributions relative to the main sequence of 55 optically selected PG and 12 near-IR-selected Two Micron All Sky Survey (2MASS) quasars at z ≤ 0.5. We estimate the quasar host stellar mas…
ALMA Observations of the Debris Disk of Solar Analog τ Ceti
MacGregor, Meredith A.; Matthews, Brenda C.; Wilner, David J. +4 more
We present 1.3 mm observations of the Sun-like star τ Ceti with the Atacama Large Millimeter/submillimeter Array that probe angular scales of ∼ 1\prime\prime (4 au). This first interferometric image of the τ Ceti system, which hosts both a debris disk and a possible multiplanet system, shows emission from a nearly face-on belt of cold d…