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How the Geysers, Tidal Stresses, and Thermal Emission across the South Polar Terrain of Enceladus are Related
Nimmo, Francis; Porco, Carolyn; DiNino, Daiana
We present the first comprehensive examination of the geysering, tidal stresses, and anomalous thermal emission across the south pole of Enceladus and discuss the implications for the moon's thermal history and interior structure. A 6.5 yr survey of the moon's south polar terrain (SPT) by the Cassini imaging experiment has located ~100 jets or gey…
The Solar Neighborhood. XXXIII. Parallax Results from the CTIOPI 0.9 m Program: Trigonometric Parallaxes of Nearby Low-mass Active and Young Systems
Gies, Douglas R.; Nelan, Edmund P.; Blunt, Sarah C. +14 more
We present basic observational data and association membership analysis for 45 young and active low-mass stellar systems from the ongoing Research Consortium On Nearby Stars photometry and astrometry program at the Cerro Tololo Inter-American Observatory. Most of these systems have saturated X-ray emission (log (LX /L bol) &g…
The Type IIb Supernova 2013df and its Cool Supergiant Progenitor
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +10 more
We have obtained early-time photometry and spectroscopy of supernova (SN) 2013df in NGC 4414. The SN is clearly of Type IIb, with notable similarities to SN 1993J. From its luminosity at secondary maximum light, it appears that less 56Ni (lsim 0.06 M ⊙) was synthesized in the SN 2013df explosion than was the case for the SNe …
Hubble Space Telescope CALSPEC Flux Standards: Sirius (and Vega)
Bohlin, R. C.
The Space Telescope Imaging Spectrograph (STIS) has measured the flux for Sirius from 0.17 to 1.01 µm on the Hubble Space Telescope (HST) White Dwarf scale. Because of the cool debris disk around Vega, Sirius is commonly recommended as the primary IR flux standard. The measured STIS flux agrees well with predictions of a special Kurucz model…
Tidally Modulated Eruptions on Enceladus: Cassini ISS Observations and Models
Nimmo, Francis; Porco, Carolyn; Mitchell, Colin
We use images acquired by the Cassini Imaging Science Subsystem (ISS) to investigate the temporal variation of the brightness and height of the south polar plume of Enceladus. The plume's brightness peaks around the moon's apoapse, but with no systematic variation in scale height with either plume brightness or Enceladus' orbital position. We comp…
Hubble Space Telescope Investigation of Main-belt Comet 133P/Elst-Pizarro
Mutchler, Max; Jewitt, David; Agarwal, Jessica +3 more
We report new observations of the prototype main-belt comet (active asteroid) 133P/Elst-Pizarro taken at high angular resolution using the Hubble Space Telescope. The object has three main components: (1) a point-like nucleus; (2) a long, narrow antisolar dust tail; and (3) a short, sunward anti-tail. There is no resolved coma. The nucleus has a m…
Late-Stage Galaxy Mergers in Cosmos to z ∼ 1
Ilbert, O.; Kartaltepe, J. S.; Jahnke, K. +15 more
The role of major mergers in galaxy and black hole formation is not well-constrained. To help address this, we develop an automated method to identify late-stage galaxy mergers before coalescence of the galactic cores. The resulting sample of mergers is distinct from those obtained using pair-finding and morphological indicators. Our method relies…
Infrared Tip of the Red Giant Branch and Distances to the Maffei/IC 342 Group
Dolphin, Andrew E.; Wu, Po-Feng; Tully, R. Brent +3 more
In this paper, we extend the use of the tip of the red giant branch (TRGB) method to near-infrared wavelengths from the previously used I-band, using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3). Upon calibration of a color dependency of the TRGB magnitude, the IR TRGB yields a random uncertainty of ~5% in relative distance. The IR …
Herschel Key Program Heritage: a Far-Infrared Source Catalog for the Magellanic Clouds
Boyer, Martha L.; Matsuura, Mikako; Meixner, Margaret +19 more
Observations from the HERschel Inventory of the Agents of Galaxy Evolution (HERITAGE) have been used to identify dusty populations of sources in the Large and Small Magellanic Clouds (LMC and SMC). We conducted the study using the HERITAGE catalogs of point sources available from the Herschel Science Center from both the Photodetector Array Camera…
Optical Spectroscopic Observations of Blazars and γ-Ray Blazar Candidates in the Sloan Digital Sky Survey Data Release Nine
Masetti, N.; Funk, S.; Massaro, F. +2 more
We present an analysis of the optical spectra available in the Sloan Digital Sky Survey data release nine (SDSS DR9) for the blazars listed in the ROMA-BZCAT and for the γ-ray blazar candidates selected according to their IR colors. First, we adopt a statistical approach based on Monte Carlo simulations to find the optical counterparts of the blaz…