Search Publications
Discovery of the First Quadruple Gravitationally Lensed Quasar Candidate with Pan-STARRS
Keeton, C. R.; Berghea, C. T.; Dudik, R. P. +2 more
We report the serendipitous discovery of the first gravitationally lensed quasar candidate from Pan-STARRS. The grizy images reveal four point-like images with magnitudes between 14.9 and 18.1 mag. The colors of the point sources are similar, and they are more consistent with quasars than with stars or galaxies. The lensing galaxy is detected in t…
ALMA constraints on star-forming gas in a prototypical z = 1.5 clumpy galaxy: the dearth of CO(5-4) emission from UV-bright clumps
Daddi, E.; Elbaz, D.; Rujopakarn, W. +13 more
We present deep ALMA CO(5-4) observations of a main-sequence, clumpy galaxy at z = 1.5 in the HUDF. Thanks to the ∼0{^''.}5 resolution of the ALMA data, we can link stellar population properties to the CO(5-4) emission on scales of a few kiloparsec. We detect strong CO(5-4) emission from the nuclear region of the galaxy, consistent with…
Gaia eclipsing binary and multiple systems. Two-Gaussian models applied to OGLE-III eclipsing binary light curves in the Large Magellanic Cloud
Audard, M.; Rimoldini, L.; Holl, B. +11 more
Context. The advent of large scale multi-epoch surveys raises the need for automated light curve (LC) processing. This is particularly true for eclipsing binaries (EBs), which form one of the most populated types of variable objects. The Gaia mission, launched at the end of 2013, is expected to detect of the order of few million EBs over a five-ye…
Global Energetics of Solar Flares. VI. Refined Energetics of Coronal Mass Ejections
Aschwanden, Markus J.
In this study, we refine the coronal mass ejection (CME) model that was presented in an earlier study of the global energetics of solar flares and associated CMEs and apply it to all (860) GOES M- and X-class flare events observed during the first seven years (2010-2016) of the Solar Dynamics Observatory (SDO) mission. The model refinements includ…
Scattering Properties of the Venusian Clouds Observed by the UV Imager on board Akatsuki
Yamada, M.; Imamura, T.; Murakami, S. +6 more
We analyze the albedo of Venus obtained from the UV Imager on board Akatsuki. A relative global mean albedo over phase angle is used in this study, and we confirm the glory feature at 283 and 365 nm in the data acquired in 2016 May. We successfully simulate the observation using a radiative transfer model. Our results show that cloud aerosols of {…
Alignments of parity even/odd-only multipoles in CMB
Aluri, Pavan K.; Ralston, John P.; Weltman, Amanda
We compare the statistics of parity even and odd multipoles of the cosmic microwave background (CMB) sky from Planck full mission temperature measurements. An excess power in odd multipoles compared to even multipoles has previously been found on large angular scales. Motivated by this apparent parity asymmetry, we evaluate directional statistics …
Hubble Space Telescope Imaging of the Active Dwarf Galaxy RGG 118
Greene, Jenny E.; Baldassare, Vivienne F.; Reines, Amy E. +1 more
RGG 118 (SDSS 1523+1145) is a nearby (z = 0.0243), dwarf disk galaxy ({M}* ≈ 2× {10}9 {M}⊙ ) that is found to host an active ∼50,000 solar mass black hole at its core. RGG 118 is one of a growing collective sample of dwarf galaxies known to contain active galactic nuclei (AGNs)—a group that, until recently, contain…
Expelled grains from an unseen parent body around AU Microscopii
Augereau, J. -C.; Boccaletti, A.; Sezestre, É. +1 more
Context. Recent observations of the edge-on debris disk of
Aims: We present a model aiming to reproduce the…
Quasar lenses and galactic streams: outlier selection and Gaia multiplet detection
Agnello, Adriano
I describe two novel techniques originally devised to select strongly lensed quasar candidates in wide-field surveys. The first relies on outlier selection in optical and mid-infrared magnitude space; the second combines mid-infrared colour selection with Gaia spatial resolution, to identify multiplets of objects with quasar-like colours. Both met…
Sheath-accumulating Propagation of Interplanetary Coronal Mass Ejection
Shibata, Kazunari; Takahashi, Takuya
Fast interplanetary coronal mass ejections (ICMEs) are the drivers of strong space weather storms such as solar energetic particle events and geomagnetic storms. The connection between the space-weather-impacting solar wind disturbances associated with fast ICMEs at Earth and the characteristics of causative energetic CMEs observed near the Sun is…