Search Publications
A Library of Theoretical Ultraviolet Spectra of Massive, Hot Stars for Evolutionary Synthesis
Pettini, Max; Leitherer, Claus; Bresolin, Fabio +5 more
We computed a comprehensive set of theoretical ultraviolet spectra of hot, massive stars with the radiation-hydrodynamics code WM-Basic. This model atmosphere and spectral synthesis code is optimized for computing the strong P Cygni type lines originating in the winds of hot stars, which are the strongest features in the ultraviolet spectral regio…
HerMES: The SPIRE confusion limit
Aussel, H.; Elbaz, D.; Valtchanov, I. +69 more
We report on the sensitivity of SPIRE photometers on the Herschel Space Observatory. Specifically, we measure the confusion noise from observations taken during the science demonstration phase of the Herschel Multi-tiered Extragalactic Survey. Confusion noise is defined to be the spatial variation of the sky intensity in the limit of infinite inte…
Physical Conditions in a Young, Unreddened, Low-metallicity Galaxy at High Redshift
Pettini, Max; Erb, Dawn K.; Shapley, Alice E. +3 more
Increasingly large samples of galaxies are now being discovered at redshifts z ~ 5-6 and higher. Many of these objects are inferred to be young, low in mass, and relatively unreddened, but detailed analysis of their high quality spectra will not be possible until the advent of future facilities. In this paper, we shed light on the physical conditi…
Black hole accretion and star formation as drivers of gas excitation and chemistry in Markarian 231
Veilleux, S.; Sanders, D. B.; Savini, G. +34 more
We present a full high resolution SPIRE FTS spectrum of the nearby ultraluminous infrared galaxy Mrk 231. In total 25 lines are detected, including CO J = 5-4 through J = 13-12, 7 rotational lines of H2O, 3 of OH+ and one line each of H2O+, CH+, and HF. We find that the excitation of the CO ro…
Star formation rates and masses of z ~ 2 galaxies from multicolour photometry
Dickinson, Mark; Daddi, Emanuele; Maraston, Claudia +4 more
Fitting synthetic spectral energy distributions (SEDs) to the multiband photometry of galaxies to derive their star formation rates (SFRs), stellar masses, ages, etc. requires making a priori assumptions about their star formation histories (SFHs). A widely adopted parametrization of the SFH, the so-called τ models where SFR ~ e-t/τ is …
Dichotomy of Solar Coronal Jets: Standard Jets and Blowout Jets
Cirtain, Jonathan W.; Moore, Ronald L.; Sterling, Alphonse C. +1 more
By examining many X-ray jets in Hinode/X-Ray Telescope coronal X-ray movies of the polar coronal holes, we found that there is a dichotomy of polar X-ray jets. About two thirds fit the standard reconnection picture for coronal jets, and about one third are another type. We present observations indicating that the non-standard jets are counterparts…
The Fourth IBIS/ISGRI Soft Gamma-ray Survey Catalog
Götz, D.; Hill, A. B.; Rodriguez, J. +19 more
In this paper, we report on the fourth soft gamma-ray source catalog obtained with the IBIS gamma-ray imager on board the INTEGRAL satellite. The scientific data set is based on more than 70 Ms of high-quality observations performed during the first five and a half years of the Core Program and public observations. Compared to previous IBIS survey…
z ~ 7 Galaxies in the HUDF: First Epoch WFC3/IR Results
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We present a sample of 16 robust z ~ 7 z 850-drop galaxies detected by the newly installed Wide Field Camera 3 (WFC3)/IR on the Hubble Space Telescope. Our analysis is based on the first epoch data of the HUDF09 program covering the Hubble Ultra Deep Field with 60 orbits of Y 105, J 125, and H 160 observ…
Weighing simulated galaxy clusters using lensing and X-ray
Rasia, E.; Mazzotta, P.; Ettori, S. +5 more
Context. Among the methods employed to measure the mass of galaxy clusters, the techniques based on lensing and X-ray analyses are perhaps the most widely used; however, the comparison between these mass estimates is often difficult and, in several clusters, the results apparently inconsistent.
Aims: We aim at investigating potential biases i…
The Distance, Mass, and Radius of the Neutron Star in 4U 1608-52
Güver, Tolga; Özel, Feryal; Cabrera-Lavers, Antonio +1 more
Low-mass X-ray binaries (LMXBs) that show thermonuclear bursts are ideal sources for constraining the equation of state of neutron star matter. The lack of independent distance measurements for most of these sources, however, prevent a systematic exploration of the masses and radii of the neutron stars, hence limiting the equation-of-state studies…