Search Publications
The Rest-frame Ultraviolet Light Profile Shapes of Lyα-emitting Galaxies at z = 3.1
Blanc, Guillermo A.; Gronwall, Caryl; Gawiser, Eric +4 more
We present a morphological analysis of the rest-frame ultraviolet emission of 78 resolved, high signal-to-noise z ~ 3.1 Lyα emitters (LAEs) in the Extended Chandra Deep Field-South. Using Hubble Space Telescope/Advanced Camera for Surveys V-band images taken as part of the Galaxy Evolution from Morphology and SEDs, Great Observatories Origins Deep…
Imaging the Time Evolution of Eta Carinae's Colliding Winds with HST
Corcoran, Michael F.; Gull, Theodore R.; Madura, Thomas I. +1 more
We report new Hubble Space Telescope/Space Telescope Imaging Spectrograph observations that map the high-ionization forbidden line emission in the inner arcsecond of Eta Car, the first that fully image the extended wind-wind interaction region of the massive colliding wind binary. These observations were obtained after the 2009.0 periastron at orb…
Four New Black Hole Candidates Identified in M31 Globular Clusters with Chandra and XMM-Newton
Murray, S. S.; Barnard, R.; Garcia, M. +2 more
We have identified four new black hole candidates (BHCs) in M31 globular clusters (GCs) using 123 Chandra and 4 XMM-Newton observations of the M31 central region. The X-ray source associated with Bo 163 (XB163) is a recurrent transient with the highest observed luminosity, ~1.4× 1038 erg s-1, considerably brighter than any ou…
Clues to the Star Formation in NGC 346 across Time and Space
Panagia, Nino; Sabbi, Elena; De Marchi, Guido
We have studied the properties of the stellar populations in the field of the NGC 346 cluster in the Small Magellanic Cloud, using the results of a novel self-consistent method that provides a reliable identification of pre-main sequence (PMS) objects actively undergoing mass accretion, regardless of their age. The 680 identified bona fide PMS sta…
Long-term Evolution of Magnetic and Dynamical Properties in A Sunspot Light Bridge
Shimizu, Toshifumi
Sunspot light bridges (LBs)—long bright lanes appearing in umbra—sometimes show dynamical behaviors such as plasma ejections, brightenings, and fast gas flows in the photosphere and lower chromosphere, but we have not understood what causes these dynamics. The Hinode Solar Optical Telescope successfully captured the entire period of the evolution …
The Spectroscopic Footprint of the Fast Solar Wind
De Pontieu, Bart; McIntosh, Scott W.; Leamon, Robert J.
We analyze a large, complex equatorial coronal hole (ECH) and its immediate surroundings with a focus on the roots of the fast solar wind. We start by demonstrating that our ECH is indeed a source of the fast solar wind at 1 AU by examining in situ plasma measurements in conjunction with recently developed measures of magnetic conditions of the ph…
Possible Evidence for a Fisk-type Heliospheric Magnetic Field. I. Analyzing Ulysses/KET Electron Observations
Fichtner, H.; Scherer, K.; Ferreira, S. E. S. +6 more
The propagation of energetic charged particles in the heliospheric magnetic field is one of the fundamental problems in heliophysics. In particular, the structure of the heliospheric magnetic field remains an unsolved problem and is discussed as a controversial topic. The first successful analytic approach to the structure of the heliospheric magn…
A Panchromatic View of NGC 602: Time-resolved Star Formation with the Hubble and Spitzer Space Telescopes
Smith, Linda J.; Cignoni, M.; Gallagher, J. S., III +16 more
We present the photometric catalogs for the star-forming cluster NGC 602 in the wing of the Small Magellanic Cloud covering a range of wavelengths from optical (HST/ACS F555W, F814W, and SMARTS/ANDICAM V, I) to infrared (Spitzer/IRAC 3.6, 4.5, 5.8, and 8 µm and MIPS 24 µm). Combining this with Infrared Survey Facility near-infrared pho…
Thermal X-Ray Emission from the Shocked Stellar Wind of Pulsar Gamma-Ray Binaries
Paredes, J. M.; Zabalza, V.; Bosch-Ramon, V.
Gamma-ray-loud X-ray binaries are binary systems that show non-thermal broadband emission from radio to gamma rays. If the system comprises a massive star and a young non-accreting pulsar, their winds will collide producing broadband non-thermal emission, most likely originated in the shocked pulsar wind. Thermal X-ray emission is expected from th…
Multiwavelength Spectroscopy of PSR B0656+14
Pavlov, George G.; Kargaltsev, Oleg; Durant, Martin
Using high-quality Hubble Space Telescope observations, we construct the near-infrared (NIR) to far-ultraviolet (FUV) spectral energy distribution (SED) of PSR B0656+14. The SED is non-monotonic. Fitting it with a simple combination of a Rayleigh-Jeans spectrum (UV) and non-thermal power law (PL; optical/NIR) leaves significant residuals, strongly…