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Optimal binning of X-ray spectra and response matrix design
Kaastra, J. S.; Bleeker, J. A. M.
Aims: A theoretical framework is developed to estimate the optimal binning of X-ray spectra.
Methods: We derived expressions for the optimal bin size for model spectra as well as for observed data using different levels of sophistication.
Results: It is shown that by taking into account both the number of photons in a given spectral…
The Evolution of the Galaxy Stellar Mass Function at z = 4-8: A Steepening Low-mass-end Slope with Increasing Redshift
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +16 more
We present galaxy stellar mass functions (GSMFs) at z = 4-8 from a rest-frame ultraviolet (UV) selected sample of ∼4500 galaxies, found via photometric redshifts over an area of ∼280 arcmin2 in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)/Great Observatories Origins Deep Survey (GOODS) fields and the Hubb…
Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars
Valenti, Jeff A.; Fischer, Debra A.; Brewer, John M. +1 more
We present a catalog of uniformly determined stellar properties and abundances for 1,617 F, G, and K stars using an automated spectral synthesis modeling procedure. All stars were observed using the HIRES spectrograph at Keck Observatory. Our procedure used a single line list to fit model spectra to observations of all stars to determine effective…
The RedMaPPer Galaxy Cluster Catalog From DES Science Verification Data
Benoit-Lévy, A.; Nichol, R. C.; D'Andrea, C. B. +87 more
We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large photometric surveys. The updated algorithm is applied to 150 {{deg}}2 of Science Verification (SV) data from the Dark Energy Survey (DES), and to the Sloan Digital Sky Survey (SDSS) DR8 photometric data set. The DES …
Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
Schaerer, D.; Thuan, T. X.; Izotov, Y. I. +4 more
Following our first detection reported in Izotov et al., we present the detection of Lyman continuum (LyC) radiation of four other compact star-forming galaxies observed with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope. These galaxies, at redshifts of z ∼ 0.3, are characterized by high emission-line flux ratios [O III]…
Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
Waters, L. B. F. M.; Pinte, C.; Ménard, F. +19 more
We propose a set of standard assumptions for the modelling of Class II and III protoplanetary disks, which includes detailed continuum radiative transfer, thermo-chemical modelling of gas and ice, and line radiative transfer from optical to cm wavelengths. The first paper of this series focuses on the assumptions about the shape of the disk, the d…
WATCHDOG: A Comprehensive All-sky Database of Galactic Black Hole X-ray Binaries
Heinke, C. O.; Sivakoff, G. R.; Gladstone, J. C. +1 more
With the advent of more sensitive all-sky instruments, the transient universe is being probed in greater depth than ever before. Taking advantage of available resources, we have established a comprehensive database of black hole (and black hole candidate) X-ray binary (BHXB) activity between 1996 and 2015 as revealed by all-sky instruments, scanni…
Enceladus's measured physical libration requires a global subsurface ocean
Burns, J. A.; Porco, C.; Tajeddine, R. +5 more
Several planetary satellites apparently have subsurface seas that are of great interest for, among other reasons, their possible habitability. The geologically diverse saturnian satellite Enceladus vigorously vents liquid water and vapor from fractures within a south polar depression and thus must have a liquid reservoir or active melting. However…
ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Infrared Excess of UV-Selected z = 2-10 Galaxies as a Function of UV-Continuum Slope and Stellar Mass
Carilli, Chris; Labbé, Ivo; Bouwens, Rychard J. +25 more
We make use of deep 1.2 mm continuum observations (12.7 µJy beam-1 rms) of a 1 arcmin2 region in the Hubble Ultra Deep Field to probe dust-enshrouded star formation from 330 Lyman-break galaxies spanning the redshift range z = 2-10 (to ∼2-3 M ⊙ yr-1 at 1σ over the entire range). Given the depth and…
Solar Coronal Jets: Observations, Theory, and Modeling
Young, P. R.; Curdt, W.; Raouafi, N. E. +13 more
Coronal jets represent important manifestations of ubiquitous solar transients, which may be the source of significant mass and energy input to the upper solar atmosphere and the solar wind. While the energy involved in a jet-like event is smaller than that of "nominal" solar flares and coronal mass ejections (CMEs), jets share many common propert…