Science Archives Publication System

Time Evolution of Elemental Ratios in Solar Energetic Particle Events

DOI: 10.3847/1538-4357/aa5274 Bibcode: 2017ApJ...835...71Z

Dalla, S.; Cohen, C. M. S.; Mewaldt, R. A. +1 more

Heavy ion ratio abundances in solar energetic particle (SEP) events, e.g., Fe/O, often exhibit decreases over time. Using particle instruments on the Advanced Composition Explorer, Solar and Heliospheric Observatory and Solar Terrestrial Relations Observatory spacecraft, we analyzed heavy ion data from 4 SEP events taking place between 2006 Decemb…

2017 • The Astrophysical Journal

SOHO 6

De-noising the galaxies in the Hubble XDF with EMPCA

DOI: 10.1093/mnras/stx1380 Bibcode: 2017MNRAS.471..750M

Maturi, Matteo

We present a method to model optical images of galaxies using expectation maximization principal components analysis. The method returns de-noised images, it relies on the data alone and does not assume any pre-established model or fitting formula. It preserves the statistical properties of the sample, minimizing possible biases. The precision of …

2017 • Monthly Notices of the Royal Astronomical Society

eHST 6

Just how hot are the ω Centauri extreme horizontal branch pulsators?

DOI: 10.1051/0004-6361/201630132 Bibcode: 2017A&A...600A.130L

Ely, J.; Latour, M.; Chayer, P. +5 more

Context. Past studies based on optical spectroscopy suggest that the five ω Cen pulsators form a rather homogeneous group of hydrogen-rich subdwarf O stars with effective temperatures of around 50 000 K. This places the stars below the red edge of the theoretical instability strip in the log g-T_eff diagram, where no p…

2017 • Astronomy and Astrophysics

IUE eHST 6

Study of ice-related flow features around Tanaica Montes, Mars: Implications for late amazonian debris-covered glaciation

DOI: 10.1016/j.icarus.2017.07.002 Bibcode: 2017Icar..297..217S

Vijayan, S.; Sinha, Rishitosh K.; Bharti, Rajiv R.

Lobate debris aprons (LDA) and lineated valley fill (LVF) have been broadly recognized in the mid-latitudes of Mars and their subsequent analyses using data from the SHAllow RADar (SHARAD) instrument has suggested evidence for contemporary ice preserved beneath these features. In this study, we conduct detailed characterization of newly identified…

2017 • Icarus

MEx 6

Long-lived volcanism within Argyre basin, Mars

DOI: 10.1016/j.icarus.2017.04.001 Bibcode: 2017Icar..293....8W

Lopes, Rosaly M. C.; Flahaut, Jessica; Buczkowski, Debra L. +6 more

The Argyre basin, one of the largest impact structures on Mars with a diameter >1200 km, formed in the Early Noachian ∼3.93 Ga. The basin has collected volatiles and other material through time, and experienced partial infilling with water evident from stratigraphic sequences, crater statistics, topography, and geomorphology. Although volcanism…

2017 • Icarus

MEx 6

Hard X-ray spectral investigations of gamma-ray bursts 120521C and 130606A at high-redshift z ∼ 6

DOI: 10.1093/mnras/stw3130 Bibcode: 2017MNRAS.466.4558Y

Tashiro, M. S.; Urata, Y.; Yasuda, T. +1 more

This study presents a temporal and spectral analysis of the prompt emission of two high-redshift gamma-ray bursts (GRBs), 120521C at z ∼ 6 and 130606A at z ∼ 5.91, using data obtained from the Swift-XRT/BAT and the Suzaku-WAM simultaneously. Based on follow-up XRT observations, the longest durations of the prompt emissions were approximately 80 s …

2017 • Monthly Notices of the Royal Astronomical Society

Suzaku 6

An analysis of the 2016 Hitomi breakup event

DOI: 10.1186/s40623-017-0633-3 Bibcode: 2017EP&S...69...51F

Flegel, Sven; Bennett, James; Lachut, Michael +2 more

The breakup of Hitomi (ASTRO-H) on 26 March 2016 is analysed. Debris from the fragmentation is used to estimate the time of the event by propagating backwards and estimating the close approach with the parent object. Based on this method, the breakup event is predicted to have occurred at approximately 01:42 UTC on 26 March 2016. The Gaussian vari…

2017 • Earth, Planets and Space

Hitomi 6

MAXI J1957+032: An Accreting Neutron Star Possibly in a Triple System

DOI: 10.3847/1538-4357/aa9277 Bibcode: 2017ApJ...851..114R

Ravi, V.

I present an optical characterization of the Galactic X-ray transient source MAXI J1957+032. This system flares by a factor of ≳10⁴ every few hundred days, with each flare lasting ∼5 days. I identify its quiescent counterpart to be a late-K/early-M dwarf star at a distance of 5 ± 2 kpc. This implies that the peak 0.5{--}10 {keV} luminos…

2017 • The Astrophysical Journal

INTEGRAL 6

A Herschel resolved debris disc around HD 105211

DOI: 10.1093/mnras/stx753 Bibcode: 2017MNRAS.468.4725H

Marshall, J. P.; Horner, J.; Marsden, S. C. +1 more

Debris discs are the dusty aftermath of planet formation processes around main-sequence stars. Analysis of these discs is often hampered by the absence of any meaningful constraint on the location and spatial extent of the disc around its host star. Multi-wavelength, resolved imaging ameliorates the degeneracies inherent in the modelling process, …

2017 • Monthly Notices of the Royal Astronomical Society

Herschel 6

CO-DARK Star Formation and Black Hole Activity in 3C 368 at Z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses

DOI: 10.3847/1538-4357/836/1/123 Bibcode: 2017ApJ...836..123L

Riechers, D.; Stacey, G.; Lamarche, C. +7 more

We present the detection of four far-infrared fine-structure oxygen lines, as well as strong upper limits for the CO(2-1) and [N II] 205 µm lines, in 3C 368, a well-studied radio-loud galaxy at z = 1.131. These new oxygen lines, taken in conjunction with previously observed neon and carbon fine-structure lines, suggest a powerful active gala…

2017 • The Astrophysical Journal

Herschel 6