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The Warm CO Gas along the UV-heated Outflow Cavity Walls: A Possible Interpretation for the Herschel/PACS CO Spectra of Embedded YSOs
Lee, Jeong-Eun; Bergin, Edwin A.; Lee, Seokho
A fraction of the mid-J (J = 14-13 to J = 24-23) CO emission detected by the Herschel/Photodetector Array Camera and Spectrometer observations of embedded young stellar objects (YSOs) has been attributed to the UV-heated outflow cavity walls. We have applied our newly developed self-consistent models of photon-dominated-region (PDR) and non-local-…
Which fundamental constants for cosmic microwave background and baryon-acoustic oscillation?
Rich, James
We use the three-scale framework of Hu et al. to show how the cosmic microwave background (CMB) anisotropy spectrum depends on the fundamental constants. As expected, the spectrum depends only on dimensionless combinations of the constants, and we emphasize the points that make this generally true for cosmological observables. Our analysis suggest…
HST/STIS Ultraviolet Spectroscopy of the Components of the Massive Triple Star δ Ori A
Corcoran, Michael F.; Gies, Douglas R.; Moffat, Anthony F. J. +4 more
The multiple star system of δ Orionis is one of the closest examples of a system containing a luminous O-type, bright giant star (component Aa1). It is often used as a spectral-type standard and has the highest observed X-ray flux of any hot-star binary. The main component Aa1 is orbited by two lower mass stars, faint Aa2 in a 5.7 day eclipsing bi…
AGN torus emission for a homogeneous sample of bright flat-spectrum radio quasars
Castignani, G.; De Zotti, G.
We have selected a complete sample of 80 flat-spectrum radio quasars (FSRQs) from the Wilkinson Microwave Anisotropy Probe (WMAP) seven-year catalog within the Sloan Digital Sky Survey (SDSS) area, all with measured redshift, and have inspected their spectral energy distributions (SEDs) looking for evidence of an active galactic nucleus torus emis…
Chemical Abundances and Physical Parameters of HII Regions in the Magellanic Clouds
Meléndez, J.; Steiner, J.; Carlos Reyes, R. E. +2 more
We used ultraviolet, optical and infrared data of eleven HII regions in the Magellanic Clouds in order to determine their physical parameters and chemical abundances. The photoionization modeling of six HII regions in the LMC and five HII regions in the SMC, allowed us to derive the abundances of He, C, N, O, Ne, S and Ar, which were compared with…
Are the Bulk of z > 2 Herschel Galaxies Proto-Spheroids?
Pozzi, F.; Gruppioni, C.; Cresci, G. +6 more
We present a backward approach for the interpretation of the evolution of the near-IR and the far-IR luminosity functions (LFs) across the redshift range 0\lt z\lt 3. In our method, late-type galaxies are treated by means of a parametric phenomenological method based on PEP/HerMES data up to z ∼ 4, whereas spheroids are described by means of a phy…
Testing for foreground residuals in the Planck foreground cleaned maps: A new method for designing confidence masks
Hansen, F. K.; Axelsson, M.; Ihle, H. T. +1 more
We test for foreground residuals in the foreground-cleaned Planck cosmic microwave background (CMB) maps outside and inside the U73 mask commonly used for cosmological analysis. The aim of this paper is to introduce a new method of validating masks by looking at the differences in cleaned maps obtained by different component-separation methods. By…
Prediction of blue, red and green aurorae at Mars
Simon Wedlund, C.; Gronoff, G.; Lilensten, J. +3 more
The upper atmosphere of Mars is a laboratory for better understanding the planetary atmosphere evolution, and is an example of the interaction of the solar wind with an unmagnetized planet that has only patches of crustal magnetic field. In that context, several space missions were launched to study the Martian environment and its aurorae, notably…
Statistical investigation on the power-law behavior of magnetic fluctuations in the Venusian magnetosheath
Zhang, Tielong; Narita, Yasuhito; Schmid, Daniel +4 more
The present work aims to develop a better understanding of wave and turbulence processes in the planetary magnetosheath region. We study the plasma conditions (temperature, flow velocity, and magnetic field), the low-frequency wave properties, and the energy spectra for magnetic field fluctuations in the Venus magnetosheath. We use the magnetic fi…
Latitudinal and Energy Dependence of Energetic Neutral Atom Spectral Indices Measured by the Interstellar Boundary Explorer
McComas, D. J.; Fuselier, S. A.; Schwadron, N. A. +8 more
We investigate the latitudinal and energy dependence of the globally distributed 0.5-6 keV energetic neutral atom (ENA) spectra measured by the Interstellar Boundary Explorer (IBEX) during the first 3 yrs of the mission. Our results are: (1) the ENA spectral indices at the two lowest energies (0.89 and 1.47 keV) exhibit no clear trend with eclipti…