Search Publications
3XMM J185246.6+003317: Another Low Magnetic Field Magnetar
Rea, N.; Torres, D. F.; Israel, G. L. +2 more
We study the outburst of the newly discovered X-ray transient 3XMM J185246.6+003317, re-analyzing all available XMM-Newton observations of the source to perform a phase-coherent timing analysis, and derive updated values of the period and period derivative. We find the source rotating at P = 11.55871346(6) s (90% confidence level; at epoch MJD 547…
A Survey of the Molecular ISM Properties of Nearby Galaxies Using the Herschel FTS
Conley, A.; Glenn, J.; Kamenetzky, J. +2 more
The 12CO J = 4 → 3 to J = 13 → 12 lines of the interstellar medium from nearby galaxies, newly observable with the Herschel SPIRE Fourier transform spectrometer, offer an opportunity to study warmer, more luminous molecular gas than that traced by 12CO J = 1 → 0. Here we present a survey of 17 nearby infrared-luminous galaxy …
A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds: First Results
Massey, Philip; Hillier, D. John; Morrell, Nidia +1 more
Over the years, directed surveys and incidental spectroscopy have identified 12 Wolf-Rayet (WR) stars in the Small Magellanic Cloud (SMC) and 139 in the Large Magellanic Cloud (LMC), numbers which are often described as "essentially complete." Yet, new WRs are discovered in the LMC almost yearly. We have therefore initiated a new survey of both Ma…
Where do Galaxies End?
Shull, J. Michael
Our current view of galaxies considers them as systems of stars and gas embedded in extended halos of dark matter, much of it formed by the infall of smaller systems at earlier times. The true extent of a galaxy remains poorly determined, with the "virial radius" (R vir) providing a characteristic separation between collapsed structures…
Blue Straggler Masses from Pulsation Properties. I. The Case of NGC 6541
Dalessandro, E.; Marconi, M.; Bono, G. +3 more
We used high spatial resolution images acquired with the Wide Field Camera 3 on board Hubble Space Telescope to probe the population of variable blue straggler stars (BSSs) in the central region of the poorly studied Galactic globular cluster NGC 6541. The time sampling of the acquired multiwavelength (F390W, F555W, and F814W) data allowed us to d…
A Full-sky, High-resolution Atlas of Galactic 12 µm Dust Emission with WISE
Meisner, Aaron M.; Finkbeiner, Douglas P.
We describe our custom processing of the entire Wide-field Infrared Survey Explorer (WISE) 12 µm imaging data set, and present a high-resolution, full-sky map of diffuse Galactic dust emission that is free of compact sources and other contaminating artifacts. The principal distinctions between our resulting co-added images and the WISE Atlas…
New Perspective on Galaxy Outflows from the First Detection of Both Intrinsic and Traverse Metal-line Absorption
Martin, Crystal L.; Bouché, Nicolas; Kacprzak, Glenn G. +6 more
We present the first observation of a galaxy (z = 0.2) that exhibits metal-line absorption back-illuminated by the galaxy (down-the-barrel) and transversely by a background quasar at a projected distance of 58 kpc. Both absorption systems, traced by Mg II, are blueshifted relative to the galaxy systemic velocity. The quasar sight line, which resid…
Hydrogen Balmer Continuum in Solar Flares Detected by the Interface Region Imaging Spectrograph (IRIS)
Heinzel, P.; Kleint, L.
We present a novel observation of the white light flare (WLF) continuum, which was significantly enhanced during the X1 flare on 2014 March 29 (SOL2014-03-29T17:48). Data from the Interface Region Imaging Spectrograph (IRIS) in its near-UV channel show that at the peak of the continuum enhancement, the contrast at the quasi-continuum window above …
Parallax beyond a Kiloparsec from Spatially Scanning the Wide Field Camera 3 on the Hubble Space Telescope
Casertano, Stefano; Anderson, Jay; Filippenko, Alexei V. +2 more
We use a newly developed observing mode on the Hubble Space Telescope (HST) and Wide Field Camera 3, spatial scanning, to increase source sampling a thousand-fold and measure changes in source positions to a precision of 20-40 µas, more than an order of magnitude better than attainable in pointed observations. This observing mode can usefull…
The Broad-band X-Ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation
Harrison, F. A.; Stern, D.; Zhang, W. W. +16 more
We have obtained a deep, simultaneous observation of the bright, nearby Seyfert galaxy IC 4329A with Suzaku and NuSTAR. Through a detailed spectral analysis, we are able to robustly separate the continuum, absorption, and distant reflection components in the spectrum. The absorbing column is found to be modest ({\sim }6 \times 10^{21} {\, cm^{-2}\…