Search Publications
Long-lived volcanism within Argyre basin, Mars
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…
Hard X-ray spectral investigations of gamma-ray bursts 120521C and 130606A at high-redshift z ∼ 6
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 …
An analysis of the 2016 Hitomi breakup event
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…
MAXI J1957+032: An Accreting Neutron Star Possibly in a Triple System
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…
A Herschel resolved debris disc around HD 105211
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, …
CO-DARK Star Formation and Black Hole Activity in 3C 368 at Z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses
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…
The outburst of the X-ray nova GRS 1739-278 in September 2016
Sunyaev, R. A.; Grebenev, S. A.; Burenin, R. A. +3 more
During the scanning observations of the Galactic center region in late August-September 2016 we detected a new (third) outburst of the historical X-ray nova GRS 1739-278, a presumed black hole in a low-mass X-ray binary. This was reported in the Astronomer's Telegrams (Mereminskiy et al. 2016). In this paper we present the results of INTEGRAL and …
The Kepler Eclipsing Binary V2281 Cygni with Twin Stars
Koo, Jae-Rim; Hong, Kyeongsoo; Lee, Jae Woo
We present the physical properties of the eclipsing binary V2281 Cyg, which shows a light-time effect due to a supposed tertiary component from its eclipse timing variation according to the Kepler observations. The high-resolution spectra and BVR photometric data of the system were obtained at Bohyunsan Optical Astronomy Observatory and Mount Lemm…
Probing the cold and warm molecular gas in the Whirlpool Galaxy: Herschel SPIRE-FTS observations of the central region of M51 (NGC 5194)
Cooray, A.; De Looze, I.; Wu, R. +12 more
We present Herschel Spectral and Photometric Imaging Receiver (SPIRE)-Fourier Transform Spectrometer (FTS) intermediate-sampled mapping observations of the central ∼8 kpc (∼150 arcsec) of M51, with a spatial resolution of 40 arcsec. We detect four 12CO transitions (J = 4-3 to J = 7-6) and the [C I] 3P2-3…
Three-dimensional Aquila Rift: magnetized H I arch anchored by molecular complex
Nakanishi, Hiroyuki; Sofue, Yoshiaki
Three-dimensional structure of the Aquila Rift of magnetized neutral gas is investigated by analysing H I and CO line data. The projected distance on the Galactic plane of the H I arch of the Aquila Rift is r⊥ ∼ 250 pc from the Sun. The H I arch emerges at l ∼ 30°, reaches to altitudes as high as ∼500 pc above the plane at l ∼ 350°, and…