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Benchmarking atomic data for the CHIANTI atomic database: coronal lines observed by Hinode EIS
Del Zanna, G.
The coronal lines that are observable in the Hinode EUV Imaging Spectrometer (EIS) wavelengths are assessed with new atomic data that have recently become available for a range of important ions. EIS spectral lines are identified based on their spatial variation across different solar regions, their wavelengths, and their intensities. Two off-limb…
A Brightest Cluster Galaxy with an Extremely Large Flat Core
Donahue, Megan; Broadhurst, Tom; Moustakas, John +14 more
Hubble Space Telescope images of the galaxy cluster A2261, obtained as part of the Cluster Lensing And Supernova survey with Hubble, show that the brightest galaxy in the cluster, A2261-BCG, has the largest core yet detected in any galaxy. The cusp radius of A2261-BCG is 3.2 kpc, twice as big as the next largest core known, and ~3 × bigger than th…
Herschel/HIFI observations of O-rich AGB stars: molecular inventory
Menten, K. M.; Olofsson, H.; Marston, A. P. +17 more
Aims: Spectra, taken with the heterodyne instrument, HIFI, aboard the Herschel Space Observatory, of O-rich asymptotic giant branch (AGB) stars which form part of the guaranteed time key program HIFISTARS are presented. The aim of this program is to study the dynamical structure, mass-loss driving mechanism, and chemistry of the outflows from…
A Reverberation Lag for the High-ionization Component of the Broad-line Region in the Narrow-line Seyfert 1 Mrk 335
Skowron, J.; Kochanek, C. S.; Horne, Keith +37 more
We present the first results from a detailed analysis of photometric and spectrophotometric data on the narrow-line Seyfert 1 (NLS1) galaxy Mrk 335, collected over a 120 day span in the fall of 2010. From these data we measure the lag in the He II λ4686 broad emission line relative to the optical continuum to be 2.7 ± 0.6 days and the lag in the H…
The star formation history and dust content in the far outer disc of M31
Lewis, Geraint F.; McConnachie, Alan W.; Ibata, Rodrigo A. +7 more
We present a detailed analysis of two fields located 26 kpc (∼5 radial scalelengths) from the centre of M31 along the south-west semimajor axis of the disc. One field samples the major axis populations - the Outer Disc field - while the other is offset by ∼18 arcmin and samples the warp in the stellar disc - the warp field. The colour-magnitude di…
A quantitative study of O stars in NGC 2244 and the Monoceros OB2 association
Martins, F.; Hillier, D. J.; Rauw, G. +1 more
Aims: Our goal is to determine the stellar and wind properties of seven O stars in the cluster NGC 2244 and three O stars in the OB association Mon OB2. These properties give us insight into the mass loss rates of O stars. They allow us to both check the validity of rotational mixing in massive stars and to better understand the effects of th…
The Progenitor of the Type Ia Supernova that Created SNR 0519-69.0 in the Large Magellanic Cloud
Schaefer, Bradley E.; Pagnotta, Ashley; Edwards, Zachary I.
Models for the progenitor systems of Type Ia supernovae can be divided into double-degenerate systems, which contain two white dwarfs, and single-degenerate systems, which contain one white dwarf plus one companion star (either a red giant, a subgiant, or a >1.16 M ⊙ main-sequence star). The white dwarf is destroyed in the supernova …
The evolution of the star formation activity per halo mass up to redshift ~1.6 as seen by Herschel
Finoguenov, A.; Berta, S.; Magnelli, B. +40 more
Aims: Star formation in massive galaxies is quenched at some point during hierarchical mass assembly. To understand where and when the quenching processes takes place, we study the evolution of the total star formation rate per unit total halo mass (Σ(SFR)/M) in three different mass scales: low mass halos (field galaxies), groups, and cluster…
Measuring the Abundance of Sub-kilometer-sized Kuiper Belt Objects Using Stellar Occultations
Livio, Mario; Nelan, Edmund P.; Gal-Yam, Avishay +6 more
We present here the analysis of about 19,500 new star hours of low ecliptic latitude observations (|b| <= 20°) obtained by the Hubble Space Telescope's Fine Guidance Sensors over a time span of more than nine years, which is in addition to the ~12, 000 star hours previously analyzed by Schlichting et al. Our search for stellar occultations by s…
Systematic Investigation of Solar Modulation of Galactic Protons for Solar Cycle 23 Using a Monte Carlo Approach with Particle Drift Effects and Latitudinal Dependence
Boella, G.; Gervasi, M.; Grandi, D. +8 more
A propagation model of galactic cosmic protons through the heliosphere was implemented using a two-dimensional Monte Carlo approach to determine the differential intensities of protons during solar cycle 23. The model includes the effects due to the variation of solar activity during the propagation of cosmic rays from the boundary of the heliopau…