Search Publications
Dust Density Distribution and Imaging Analysis of Different Ice Lines in Protoplanetary Disks
Pinilla, P.; Pohl, A.; Birnstiel, T. +1 more
Recent high angular resolution observations of protoplanetary disks at different wavelengths have revealed several kinds of structures, including multiple bright and dark rings. Embedded planets are the most used explanation for such structures, but there are alternative models capable of shaping the dust in rings as it has been observed. We assum…
The Sloan Lens ACS Survey. XIII. Discovery of 40 New Galaxy-scale Strong Lenses
Treu, Tommaso; Brownstein, Joel R.; Gavazzi, Raphaël +8 more
We present the full sample of 118 galaxy-scale strong-lens candidates in the Sloan Lens ACS (SLACS) Survey for the Masses (S4TM) Survey, which are spectroscopically selected from the final data release of the Sloan Digital Sky Survey. Follow-up Hubble Space Telescope (HST) imaging observations confirm that 40 candidates are definite strong lenses …
The Canada-France Imaging Survey: First Results from the u-Band Component
Sawicki, Marcin; Mellier, Yannick; Robin, Annie C. +41 more
The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in the u-band ("CFIS-u," 10,000 °2) and in the r-band ("CFIS-r," 5000 °2), enabling a host of stand-alone science investigations, and providing some of the ground-based data necessary for photometric redshift determination for the Euclid …
The MUSCLES Treasury Survey. IV. Scaling Relations for Ultraviolet, Ca II K, and Energetic Particle Fluxes from M Dwarfs
Loyd, R. O. Parke; Hawley, Suzanne L.; Redfield, Seth +18 more
Characterizing the UV spectral energy distribution (SED) of an exoplanet host star is critically important for assessing its planet’s potential habitability, particularly for M dwarfs, as they are prime targets for current and near-term exoplanet characterization efforts and atmospheric models predict that their UV radiation can produce photochemi…
Reconstruction of Galaxy Star Formation Histories through SED Fitting:The Dense Basis Approach
Gawiser, Eric; Iyer, Kartheik
We introduce the dense basis method for Spectral Energy Distribution (SED) fitting. It accurately recovers traditional SED parameters, including M *, SFR, and dust attenuation, and reveals previously inaccessible information about the number and duration of star formation episodes and the timing of stellar mass assembly, as well as unce…
Lessons from the Onset of a Common Envelope Episode: the Remarkable M31 2015 Luminous Red Nova Outburst
Ramirez-Ruiz, Enrico; MacLeod, Morgan; Grindlay, Jonathan +3 more
This paper investigates the recent stellar-merger transient M31LRN 2015 in the Andromeda galaxy. We analyze published optical photometry and spectroscopy along with a Hubble Space Telescope detection of the color and magnitude of the pre-outburst source. The transient outburst is consistent with dynamically driven ejecta at the onset of a common e…
The Fraction of Cool-core Clusters in X-Ray versus SZ Samples Using Chandra Observations
Lovisari, Lorenzo; Andrade-Santos, Felipe; Jones, Christine +21 more
We derive and compare the fractions of cool-core clusters in the Planck Early Sunyaev-Zel’dovich sample of 164 clusters with z≤slant 0.35 and in a flux-limited X-ray sample of 100 clusters with z≤slant 0.30, using Chandra observations. We use four metrics to identify cool-core clusters: (1) the concentration parameter, which is the ratio of the in…
Dense Molecular Gas Tracers in the Outflow of the Starburst Galaxy NGC 253
Meier, David S.; Ott, Jürgen; Warren, Steven R. +12 more
We present a detailed study of a molecular outflow feature in the nearby starburst galaxy NGC 253 using ALMA. We find that this feature is clearly associated with the edge of NGC 253's prominent ionized outflow, has a projected length of ∼300 pc, with a width of ∼50 pc, and a velocity dispersion of ∼40 km s-1, which is consistent with a…
An ALMA Survey of DCN/H13CN and DCO+/H13CO+ in Protoplanetary Disks
Wilner, David J.; Aikawa, Yuri; Andrews, Sean M. +7 more
The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for probing how material is inherited or reprocessed throughout the stages of star and planet formation. We present ALMA observations at ∼0.″6 resolution of DCO+, H
X-ray and Ultraviolet Properties of AGNs in Nearby Dwarf Galaxies
Greene, Jenny E.; Baldassare, Vivienne F.; Reines, Amy E. +1 more
We present new Chandra X-ray Observatory and Hubble Space Telescope observations of eight optically selected broad-line active galactic nucleus (AGN) candidates in nearby dwarf galaxies (z < 0.055). Including archival Chandra observations of three additional sources, our sample contains all 10 galaxies from Reines et al. (2013) with both broad …