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The Evolution of Galaxy Size and Morphology at z ~ 0.5-3.0 in the GOODS-N Region with Hubble Space Telescope/WFC3 Data
Kajisawa, Masaru; Morishita, Takahiro; Ichikawa, Takashi
We analyze the recently released Hubble Space Telescope/Wide Field Camera 3 IR images in the GOODS-N region to study the formation and evolution of quiescent galaxies (QGs). After examining the reliability of two-dimensional light profiles with artificial galaxies, we obtain the morphological parameters with Sérsic profile of 299 QGs and 1083 star…
WISE Y Dwarfs as Probes of the Brown Dwarf-Exoplanet Connection
Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R. +5 more
We have determined astrometric positions for 15 WISE-discovered late-type brown dwarfs (six T8-9 and nine Y dwarfs) using the Keck-II telescope, the Spitzer Space Telescope, and the Hubble Space Telescope. Combining data from 8 to 20 epochs we derive parallactic and proper motions for these objects, which puts the majority within 15 pc. For ages g…
Winds of Low-metallicity OB-type Stars: HST-COS Spectroscopy in IC 1613
Garcia, Miriam; Herrero, Artemio; Najarro, Francisco +2 more
We present the first quantitative ultraviolet spectroscopic analysis of resolved OB stars in IC 1613. Because of its alleged very low metallicity (lsim1/10 Z ⊙, from H II regions), studies in this Local Group dwarf galaxy could become a significant step forward from the Small Magellanic Cloud (SMC) toward the extremely metal-poor massiv…
Global mapping and characterization of Titan's dune fields with Cassini: Correlation between RADAR and VIMS observations
Le Mouélic, S.; Cornet, T.; Rodriguez, S. +18 more
Vast fields of linear dunes have been observed in the equatorial regions of Titan, Saturn's largest moon. As the Cassini mission, in orbit around Saturn since July 2004 and extended until May 2017, carries on, the high-resolution coverage of Titan's surface increases, revealing new dune fields and allowing refinements in the examination of their p…
Revealing Asymmetries in the HD 181327 Debris Disk: A Recent Massive Collision or Interstellar Medium Warping
Stark, Christopher C.; Weinberger, Alycia J.; Debes, John H. +4 more
New multi-roll coronagraphic images of the HD 181327 debris disk obtained using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope reveal the debris ring in its entirety at high signal-to-noise ratio and unprecedented spatial resolution. We present and apply a new multi-roll image processing routine to identify and furthe…
The unresolved fine structure resolved: IRIS observations of the solar transition region
Golub, L.; Tian, H.; De Pontieu, B. +18 more
The heating of the outer solar atmospheric layers, i.e., the transition region and corona, to high temperatures is a long-standing problem in solar (and stellar) physics. Solutions have been hampered by an incomplete understanding of the magnetically controlled structure of these regions. The high spatial and temporal resolution observations with …
CARMA Large Area Star Formation Survey: Structure and Kinematics of Dense Gas in Serpens Main
Kwon, Woojin; Rosolowsky, Erik; Kauffmann, Jens +21 more
We present observations of N2H+ (J = 1 → 0), HCO+ (J = 1 → 0), and HCN (J = 1 → 0) toward the Serpens Main molecular cloud from the CARMA Large Area Star Formation Survey (CLASSy). We mapped 150 arcmin2 of Serpens Main with an angular resolution of ~7''. The gas emission is concentrated in two subcluster…
Five Debris Disks Newly Revealed in Scattered Light from the Hubble Space Telescope NICMOS Archive
Schneider, Glenn; Hines, Dean C.; Perrin, Marshall D. +12 more
We have spatially resolved five debris disks (HD 30447, HD 35841, HD 141943, HD 191089, and HD 202917) for the first time in near-infrared scattered light by reanalyzing archival Hubble Space Telescope (HST)/NICMOS coronagraphic images obtained between 1999 and 2006. One of these disks (HD 202917) was previously resolved at visible wavelengths usi…
The halo+cluster system of the Galactic globular cluster NGC 1851
Weiss, A.; Milone, A. P.; Marino, A. F. +17 more
NGC 1851 is surrounded by a stellar component that extends more than 10 times beyond the tidal radius. Although the nature of this stellar structure is not known, it has been suggested to be a sparse halo of stars or associated with a stellar stream. We analyse the nature of this intriguing stellar component surrounding NGC 1851 by investigating i…
A z = 2.5 protocluster associated with the radio galaxy MRC 2104-242: star formation and differing mass functions in dense environments
Kurk, J. D.; Rigby, E. E.; Hatch, N. A. +2 more
We present results from a narrow-band survey of the field around the high-redshift radio galaxy MRC 2104-242. We have selected Hα emitters in a 7 arcmin2 field and compared the measured number density with that of a field sample at similar redshift. We find that MRC 2104-242 lies in an overdensity of galaxies that is 8.0 ± 0.8 times the…