Search Publications
Suzaku Observations of the Diffuse X-Ray Emission across the Fermi Bubbles' Edges
Cheung, C. C.; Kataoka, J.; Stawarz, Ł. +10 more
We present Suzaku X-ray observations along two edge regions of the Fermi Bubbles, with eight ~= 20 ks pointings across the northern part of the North Polar Spur (NPS) surrounding the north bubble and six across the southernmost edge of the south bubble. After removing compact X-ray features, diffuse X-ray emission is clearly detected and is well r…
The X-Ray Star Formation Story as Told by Lyman Break Galaxies in the 4 Ms CDF-S
Brandt, W. N.; Bouwens, Rychard J.; Zezas, Andreas +12 more
We present results from deep X-ray stacking of >4000 high-redshift galaxies from z ≈ 1 to 8 using the 4 Ms Chandra Deep Field-South data, the deepest X-ray survey of the extragalactic sky to date. The galaxy samples were selected using the Lyman break technique based primarily on recent Hubble Space Telescope ACS and WFC3 observations. Based on…
Double Blue Straggler Sequences in Globular Clusters: The Case of NGC 362
Dalessandro, E.; Massari, D.; Beccari, G. +8 more
We used high-quality images acquired with the Wide Field Camera 3 on board the Hubble Space Telescope to probe the blue straggler star (BSS) population of the galactic globular cluster NGC 362. We have found two distinct sequences of BSSs: this is the second case, after M30, where such a feature has been observed. Indeed, the BSS location, their e…
An XMM-Newton Survey of the Soft X-Ray Background. III. The Galactic Halo X-Ray Emission
Henley, David B.; Shelton, Robin L.
We present measurements of the Galactic halo's X-ray emission for 110 XMM-Newton sight lines selected to minimize contamination from solar wind charge exchange emission. We detect emission from few million degree gas on ~4/5 of our sight lines. The temperature is fairly uniform (median = 2.22 × 106 K, interquartile range = 0.63 × 10
Computing Intrinsic LYα Fluxes of F5 V to M5 V Stars
France, Kevin; Linsky, Jeffrey L.; Ayres, Tom
The Lyα emission line dominates the far-ultraviolet spectra of late-type stars and is a major source for photodissociation of important molecules including H2O, CH4, and CO2 in exoplanet atmospheres. The incident flux in this line illuminating an exoplanet's atmosphere cannot be measured directly as neutral hydroge…
Changes of Dust Opacity with Density in the Orion A Molecular Cloud
Arzoumanian, Doris; Di Francesco, James; André, Philippe +12 more
We have studied the opacity of dust grains at submillimeter wavelengths by estimating the optical depth from imaging at 160, 250, 350, and 500 µm from the Herschel Gould Belt Survey and comparing this to a column density obtained from the Two Micron All Sky Survey derived color excess E(J - K s). Our main goal was to investigate t…
A New Population of High-z, Dusty Lyα Emitters and Blobs Discovered by WISE: Feedback Caught in the Act?
Tsai, Chao-Wei; Griffith, Roger L.; Wright, Edward L. +12 more
By combining data from the NASA Wide-field Infrared Survey Explorer (WISE) mission with optical spectroscopy from the W. M. Keck telescope, we discover a mid-IR color criterion that yields a 78% success rate in identifying rare, typically radio-quiet, 1.6 <~ z <~ 4.6 dusty Lyα emitters (LAEs). Of these, at least 37% have emission extended on…
Three-dimensional Features of the Outer Heliosphere due to Coupling between the Interstellar and Interplanetary Magnetic Fields. IV. Solar Cycle Model Based on Ulysses Observations
McComas, D. J.; Pogorelov, N. V.; Zank, G. P. +3 more
The solar cycle has a profound influence on the solar wind (SW) interaction with the local interstellar medium (LISM) on more than one timescales. Also, there are substantial differences in individual solar cycle lengths and SW behavior within them. The presence of a slow SW belt, with a variable latitudinal extent changing within each solar cycle…
Herschel/PACS Spectroscopic Survey of Protostars in Orion: The Origin of Far-infrared CO Emission
Maret, S.; Manoj, P.; Di Francesco, J. +14 more
We present far-infrared (57-196 µm) spectra of 21 protostars in the Orion molecular clouds. These were obtained with the Photodetector Array Camera and Spectrometer (PACS) on board the Herschel Space observatory as part of the Herschel Orion Protostar Survey program. We analyzed the emission lines from rotational transitions of CO, involving…
HD 140283: A Star in the Solar Neighborhood that Formed Shortly after the Big Bang
Schaefer, Gail H.; Nelan, Edmund P.; Bond, Howard E. +2 more
HD 140283 is an extremely metal-deficient and high-velocity subgiant in the solar neighborhood, having a location in the Hertzsprung-Russell diagram where absolute magnitude is most sensitive to stellar age. Because it is bright, nearby, unreddened, and has a well-determined chemical composition, this star avoids most of the issues involved in age…