Search Publications
UV contrasts and microphysical properties of the upper clouds of Venus from the UV and NIR VMC/VEx images
Markiewicz, Wojciech J.; Petrova, Elena V.; Shalygina, Oksana S.
The nature of UV contrasts observed on the upper cloud deck of Venus is still not known. To constrain better the properties of particles that may cause the UV contrasts, the phase dependences of brightness of the venusian clouds measured by the ultraviolet and near-infrared channels of the Venus Express Venus Monitoring Camera (VMC) in the UV dark…
Multi-frequency study of the newly confirmed supernova remnant MCSNR J0512-6707 in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +5 more
Aims: We present a multi-frequency study of the supernova remnant MCSNR J0512-6707 in the Large Magellanic Cloud.
Methods: We used new data from XMM-Newton to characterise the X-ray emission and data from the Australian Telescope Compact Array, the Magellanic Cloud Emission Line Survey, and Spitzer to gain a picture of the environment in…
A new upper limit to the field-aligned potential near Titan
Coates, Andrew J.; Waite, J. Hunter; Jones, Geraint H. +1 more
Neutral particles dominate regions of the Saturn magnetosphere and locations near several of Saturn's moons. Sunlight ionizes neutrals, producing photoelectrons with characteristic energy spectra. The Cassini plasma spectrometer electron spectrometer has detected photoelectrons throughout these regions, where photoelectrons may be used as tracers …
Limits on Lyman Continuum Escape from z = 2.2 Hα-emitting Galaxies
Östlin, G.; Guaita, L.; Sandberg, A. +2 more
The leakage of Lyman continuum (LyC) photons from star-forming galaxies is an elusive parameter. When observed, it provides a wealth of information on star formation in galaxies and on the geometry of the interstellar medium, and puts constraints on the role of star-forming galaxies in the reionization of the universe. Hα-selected galaxies at z∼ 2…
Possibility of observable signatures of leptonium from astrophysical sources
Bland-Hawthorn, Joss; Ellis, S. C.
The formation of positronium in our Galaxy is well measured, and has led to important and unanswered questions on the origin of the positrons. In principle it should be possible to form analogous systems from µ and τ leptons, viz. true muonium and true tauonium. However the probability of formation for these systems is greatly reduced due to…
Not In Our Backyard: Spectroscopic Support for the CLASH z=11 Candidate MACS 0647-JD
Pirzkal, Nor; Donahue, Megan; Frye, Brenda L. +12 more
We report on our first set of spectroscopic Hubble Space Telescope observations of the z≈ 11 candidate galaxy, which is strongly lensed by the MACSJ 0647.7+7015 galaxy cluster. The three lensed images are faint and we show that these early slitless grism observations are of sufficient depth to investigate whether this high-redshift candidate, iden…
Infrared colour properties of nearby radio-luminous galaxies
Yang, Xiao-hong; Chen, Pei-sheng; Huang, Yan
By combining the data of the Two Micron All Sky Survey, the Wide-Field Infrared Survey Explorer and the AKARI satellite, we study the infrared colour properties of a sample of 2712 nearby radio-luminous galaxies (RLGs). These RLGs are divided into radio-loud (RL) active galactic nuclei (AGNs), mainly occurring at redshifts of 0.05 < z < 0.3 …
CLASH: Extreme Emission-line Galaxies and Their Implication on Selection of High-redshift Galaxies
Donahue, Megan; Broadhurst, Tom; Frye, Brenda L. +23 more
We utilize the Cluster Lensing And Supernova survey with Hubble observations of 25 clusters to search for extreme emission-line galaxies (EELGs). The selections are carried out in two central bands: F105W (Y 105) and F125W (J 125), as the flux of the central bands could be enhanced by the presence of [O III] λλ4959, 5007 at r…
A Combined Spitzer and Herschel Infrared Study of Gas and Dust in the Circumbinary Disk Orbiting V4046 Sgr
Kastner, Joel H.; Wilner, David; Andrews, Sean +6 more
We present results from a spectroscopic Spitzer and Herschel mid-to-far-infrared study of the circumbinary disk orbiting the evolved (age ∼12-23 Myr) close binary T Tauri system V4046 Sgr. Spitzer InfraRed Spectrograph spectra show emission lines of [Ne ii], H2 S(1), CO2, and HCN, while Herschel Photodetector Array Camera and…
Star Formation Activity in the Long, Filamentary Infrared Dark Cloud G53.2
Koo, Bon-Chul; Kim, Hyun-Jeong; Davis, Christopher J.
We present star formation activity in the infrared dark cloud (IRDC) G53.2, a remarkable IRDC located at Galactic coordinates (l,b)∼ (53\buildrel{\circ}\over{.} 2, 0\buildrel{\circ}\over{.} 0) based on the census of young stellar object (YSO) candidates. IRDC G53.2 was previously identified as several IRDCs in mid-IR images, but it is in fact a lo…