Search Publications
The distribution of putative periglacial landforms on the martian northern plains
Balme, Matthew R.; Patel, Manish R.; Hagermann, Axel +1 more
In this investigation, HiRISE images were surveyed across three regions of the Northern Plains of Mars; Acidalia, Arcadia and Utopia Planitiae. A sample of HiRISE images within each of these areas was examined. The aim of the investigation was to determine the distribution of three varieties of landform; clastic patterned ground, lobate hill-slope…
The first optical spectra of Wolf-Rayet stars in M101 revealed with Gemini/GMOS
Crowther, P. A.; Long, K. S.; Moffat, A. F. J. +4 more
Deep narrow-band Hubble Space Telescope (HST) imaging of the iconic spiral galaxy M101 has revealed over a thousand new Wolf-Rayet (WR) candidates. We report spectrographic confirmation of 10 He II-emission line sources hosting 15 WR stars. We find WR stars present at both sub- and super-solar metallicities with WC stars favouring more metal-rich …
Calibration OGSEs for multichannel radiometers for Mars atmosphere studies
Jiménez, J. J.; J Álvarez, F.; Gonzalez-Guerrero, M. +5 more
This work describes several Optical Ground Support Equipment (OGSEs) developed by INTA (Spanish Institute of Aerospace Technology—Instituto Nacional de Técnica Aeroespacial) for the calibration and characterization of their self-manufactured multichannel radiometers (solar irradiance sensors—SIS) developed for working on the surface of Mars and st…
The star-forming cores in the centre of the Trifid nebula (M 20): from Herschel to the near-infrared
Elia, D.; Giovannelli, F.; Persi, P. +3 more
A new detailed infrared (IR) study of eight star-forming dense condensations (TCs) in M 20, the Trifid nebula, is presented. The aim is to determine the physical properties of the dust in such globules and establish the presence and properties of their embedded protostellar and/or young stellar population. For this, we analysed new Herschel far-IR…
The failed state transition of the ATOLL source GRS 1724-308
Capitanio, F.; Tarana, A.; Cocchi, M.
The 2004-2012 X-ray time history of the NS LMXB GRS 1724-308 shows, along with the episodic brightenings associated with the low-high state transitions typical of the ATOLL sources, a peculiar, long lasting (∼300 d) flaring event, observed in 2008. This rare episode, characterized by a high-flux hard state, has never been observed before for GRS 1…
The Effects of Barycentric and Asymmetric Transverse Velocities on Eclipse and Transit Times
Stassun, Keivan G.; Prša, Andrej; Conroy, Kyle E. +1 more
It has long been recognized that the finite speed of light can affect the observed time of an event. For example, as a source moves radially toward or away from an observer, the path length and therefore the light travel time to the observer decreases or increases, causing the event to appear earlier or later than otherwise expected, respectively.…
SOFIA/HAWC+ Detection of a Gravitationally Lensed Starburst Galaxy at z = 1.03
Staguhn, Johannes; Dowell, C. Darren; Fadda, Dario +13 more
We present the detection at 89 µm (observed frame) of the Herschel-selected gravitationally lensed starburst galaxy HATLAS J1429-0028 (also known as G15v2.19) in 15 minutes with the High-resolution Airborne Wideband Camera-plus (HAWC+) onboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The spectacular lensing system consis…
The mass of Albireo Aa and the nature of Albireo AB. New aspects from Gaia DR2
Bastian, U.; Anton, R.
Aims: We aim to clarify the nature of Albireo AB and specifically to decipher whether it is an optical or physical pair. We also try to determine the mass of Albireo Aa.
Methods: We scrutinize and compare the available absolute astrometric data (from HIPPARCOS and Gaia DR2) of Albireo A and B, and we investigate the relative orbit of the…
Detection of a 23.6 min periodic modulation in the optical counterpart of 3XMMJ051034.6-670353
Dhillon, V. S.; Marsh, T. R.; Groot, P. +4 more
We present high speed optical photometric observations made using the NTT and ULTRACAM of the optical counterpart of 3XMMJ051034.6-670353, which was recently identified as an X-ray source showing a modulation on a period of 23.6 min. Although the optical counterpart is faint (g = 21.4), we find that the u'g'r' light curves show a periodic modulati…
Long term evolution of temperature in the venus upper atmosphere at the evening and morning terminators
Pätzold, M.; Vandaele, A. C.; Montmessin, F. +11 more
This paper contains a comprehensive dataset of long-term observations between 2009 and 2015 at the upper mesosphere/lower thermosphere providing temperature values at different locations of the morning and evening side of the terminator of Venus. Temperature information is obtained by line-resolved spectroscopy of Doppler broadened CO2 …