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Compositional provinces of Mars from statistical analyses of TES, GRS, OMEGA and CRISM data
Rogers, A. Deanne; Hamilton, Victoria E.
identified 10 distinct classes of mineral assemblage on Mars through statistical analyses of mineral abundances derived from Mars Global Surveyor Thermal Emission Spectrometer (TES) data at a spatial resolution of 8 pixels per degree. Two classes are new regions in Sinus Meridiani and northern Hellas basin. Except for crystalline hematite abundanc…
Asteroid lightcurve inversion with Lommel-Seeliger ellipsoids
Muinonen, Karri; Wilkman, Olli; Cellino, Alberto +2 more
We derive initial rotation, shape, and scattering properties for asteroids from sparse and dense photometry based on the so-called Lommel-Seeliger ellipsoid (LS ellipsoid). Due to the analytical disk-integrated brightness, the LS ellipsoid allows for fast rotation-period, pole-orientation, and shape analyses, as well as efficient Markov-chain Mont…
Dissecting galactic bulges in space and time - I. The importance of early formation scenarios versus secular evolution
Seidel, M. K.; Falcón-Barroso, J.; Vogt, F. P. A. +7 more
The details of bulge formation via collapse, mergers, secular processes or their interplay remain unresolved. To start answering this question and quantify the importance of distinct mechanisms, we mapped a sample of three galactic bulges using data from the integral field spectrograph WiFeS on the ANU's 2.3-m telescope in Siding Spring Observator…
Hiding in Plain Sight: Record-breaking Compact Stellar Systems in the Sloan Digital Sky Survey
Janz, Joachim; Forbes, Duncan A.; Romanowsky, Aaron J. +10 more
Motivated by the recent, serendipitous discovery of the densest known galaxy, M60-UCD1, we present two initial findings from a follow-up search, using the Sloan Digital Sky Survey, Subaru/Suprime-Cam, and Hubble Space Telescope imaging, and SOuthern Astrophysical Research (SOAR)/Goodman spectroscopy. The first object discovered, M59-UCD3, has a si…
Characterization of the Inner Knot of the Crab: The Site of the Gamma-Ray Flares?
Weisskopf, Martin C.; Tennant, Allyn; Caraveo, Patrizia +18 more
A particularly intriguing recent result from γ-ray astronomy missions is the detection of powerful flares from the Crab Nebula, which challenges the current understanding of pulsar wind nebulae and acceleration mechanisms. To search for the production site(s) of these flares, we conducted a multi-wavelength observing campaign using Keck, the Hubbl…
A Herschel Study of 24 µµm-Selected AGNs and Their Host Galaxies
Smith, G. P.; Egami, E.; Rieke, G. H. +3 more
We present a sample of 290 24 µm-selected active galactic nuclei (AGNs) mostly at z ∼ 0.3-2.5, within 5.2 {{deg}}2 distributed as 25\prime × 25\prime fields around each of 30 galaxy clusters in the Local Cluster Substructure Survey. The sample is nearly complete to 1 mJy at 24 µm, and has a rich multiwavelength set of ancill…
Observed trend in the star formation history and the dark matter fraction of galaxies at redshift z ≈ 0.8
Cappellari, Michele; Shetty, Shravan
We study the star formation history for a sample of 154 galaxies with stellar mass 10^{10}≲ M_{*} ≲ 10^{12} { M_{⊙}} in the redshift range 0.7 < z < 0.9. We do this using stellar population models combined with full-spectrum fitting of good quality spectra and high-resolution photometry. For a subset of 68 galaxies (M_{*}≳ 10^{11}{ M_{⊙}}) w…
Herschel Observations of Extra-ordinary Sources: Analysi sof the HIFI 1.2 THz Wide Spectral Survey toward Orion KL II. Chemical Implications
Favre, C.; Bergin, E. A.; Crockett, N. R. +5 more
We present chemical implications arising from spectral models fit to the Herschel/HIFI spectral survey toward the Orion Kleinmann-Low nebula (Orion KL). We focus our discussion on the eight complex organics detected within the HIFI survey utilizing a novel technique to identify those molecules emitting in the hottest gas. In particular, we find th…
Proper Motions in Terzan 5: Membership of the Multi-iron Subpopulations and First Constraint on the Orbit
Dalessandro, E.; Massari, D.; Rich, R. M. +6 more
By exploiting two sets of high-resolution images obtained with the Hubble Space Telescope Advanced Camera for Surveys/Wide Field Channel over a baseline of ∼10 years, we have measured relative proper motions (PMs) of ∼70,000 stars in the stellar system Terzan 5. The results confirm the membership of the three subpopulations with different iron abu…
A Two-ribbon White-light Flare Associated with a Failed Solar Eruption Observed by ONSET, SDO, and IRIS
Cheng, X.; Ding, M. D.; Chen, P. F. +4 more
Two-ribbon brightenings are one of the most remarkable characteristics of an eruptive solar flare and are often used to predict the occurrence of coronal mass ejections (CMEs). Nevertheless, it was recently called into question whether all two-ribbon flares are eruptive. In this paper, we investigate a two-ribbon-like white-light (WL) flare that i…