Search Publications
Instrument Calibration of the Interface Region Imaging Spectrograph (IRIS) Mission
De Pontieu, B.; Bryans, P.; Liu, W. +15 more
The Interface Region Imaging Spectrograph (IRIS) is a NASA small explorer mission that provides high-resolution spectra and images of the Sun in the 133 - 141 nm and 278 - 283 nm wavelength bands. The IRIS data are archived in calibrated form and made available to the public within seven days of observing. The calibrations applied to the data incl…
Gaia GraL: Gaia DR2 gravitational lens systems. I. New quadruply imaged quasar candidates around known quasars
Djorgovski, S. G.; Surdej, J.; Ducourant, C. +12 more
Context. Multiply imaged gravitationally lensed quasars are among the most interesting and useful observable extragalactic phenomena. Because their study constitutes a unique tool in various fields of astronomy, they are highly sought, but difficult to find. Even in this era of all-sky surveys, discovering them remains a great challenge, with bare…
Science from a glimpse: Hubble SNAPshot observations of massive galaxy clusters
Ebeling, H.; Repp, A.
Hubble Space Telescope SNAPshot surveys of 86 X-ray-selected galaxy clusters at 0.3 < z < 0.5 from the MAssive Cluster Survey (MACS) sample have proven invaluable for the exploration of a wide range of astronomical research topics. We here present an overview of the four MACS SNAPshot surveys conducted from Cycle 14 to Cycle 20 as part of a …
First Results of an ALMA Band 10 Spectral Line Survey of NGC 6334I: Detections of Glycolaldehyde (HC(O)CH2OH) and a New Compact Bipolar Outflow in HDO and CS
McGuire, Brett A.; van Dishoeck, Ewine F.; Blake, Geoffrey A. +9 more
We present the first results of a pilot program to conduct an Atacama Large Millimeter Array (ALMA) band 10 spectral line survey of the high-mass star-forming region NGC 6334I. The observations were taken in exceptional weather conditions (0.19 mm precipitable water) with typical system temperatures T sys < 950 K at ∼890 GHz. A brigh…
CMEs in the Heliosphere: I. A Statistical Analysis of the Observational Properties of CMEs Detected in the Heliosphere from 2007 to 2017 by STEREO/HI-1
Rodriguez, L.; Möstl, C.; Kilpua, E. K. J. +10 more
We present a statistical analysis of coronal mass ejections (CMEs) imaged by the Heliospheric Imager (HI) instruments on board NASA's twin-spacecraft STEREO mission between April 2007 and August 2017 for STEREO-A and between April 2007 and September 2014 for STEREO-B. The analysis exploits a catalogue that was generated within the FP7 HELCATS proj…
The MASSIVE Survey - X. Misalignment between kinematic and photometric axes and intrinsic shapes of massive early-type galaxies
Ma, Chung-Pei; Greene, Jenny E.; Goulding, Andy D. +7 more
We use spatially resolved two-dimensional stellar velocity maps over a 107 × 107 arcsec2 field of view to investigate the kinematic features of 90 early-type galaxies above stellar mass 10^{11.5} M_{⊙ } in the MASSIVE survey. We measure the misalignment angle Ψ between the kinematic and photometric axes and identify local features such …
A deeper look at the GD1 stream: density variations and wiggles
Ferrarese, L.; Belokurov, V.; Koposov, S. E. +4 more
Using deep photometric data from Canada-France-Hawaii Telescope/Megacam, we study the morphology and density of the GD-1 stream, one of the longest and coldest stellar streams in the Milky Way. Our deep data recovers the lower main sequence of the stream with unprecedented quality, clearly separating it from Milky Way foreground and background sta…
The 30 Year Search for the Compact Object in SN 1987A
Baes, Maarten; Matsuura, Mikako; Fransson, Claes +32 more
Despite more than 30 years of searching, the compact object in Supernova (SN) 1987A has not yet been detected. We present new limits on the compact object in SN 1987A using millimeter, near-infrared, optical, ultraviolet, and X-ray observations from ALMA, VLT, HST, and Chandra. The limits are approximately 0.1 mJy (0.1× {10}-26 erg s
MACS J0416.1-2403: Impact of line-of-sight structures on strong gravitational lensing modelling of galaxy clusters
Grillo, C.; Balestra, I.; Rosati, P. +5 more
Exploiting the powerful tool of strong gravitational lensing by galaxy clusters to study the highest-redshift Universe and cluster mass distributions relies on precise lens mass modelling. In this work, we aim to present the first attempt at modelling line-of-sight (LOS) mass distribution in addition to that of the cluster, extending previous mode…
MUSE Spectroscopic Identifications of Ultra-faint Emission Line Galaxies with M UV ∼ -15
Bacon, Roland; Bouché, Nicolas; Inami, Hanae +16 more
Using an ultra-deep blind survey with the MUSE integral field spectrograph on the European Southern Observatory Very Large Telescope, we obtain spectroscopic redshifts to a depth never before explored: galaxies with observed magnitudes m AB ≳ 30-32. Specifically, we detect objects via Lyα emission at 2.9 < z < 6.7 without individu…