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Prediction of Solar Flare Size and Time-to-Flare Using Support Vector Machine Regression
McAteer, R. T. James; Boucheron, Laura E.; Al-Ghraibah, Amani
We study the prediction of solar flare size and time-to-flare using 38 features describing magnetic complexity of the photospheric magnetic field. This work uses support vector regression to formulate a mapping from the 38-dimensional feature space to a continuous-valued label vector representing flare size or time-to-flare. When we consider flari…
Constraints on a potential aerial biosphere on Venus: I. Cosmic rays
Coates, Andrew J.; Jones, Geraint H.; Patel, Manish R. +3 more
While the present-day surface of Venus is certainly incompatible with terrestrial biology, the planet may have possessed oceans in the past and provided conditions suitable for the origin of life. Venusian life may persist today high in the atmosphere where the temperature and pH regime is tolerable to terrestrial extremophile microbes: an aerial …
A Physical Approach to the Identification of High-z Mergers: Morphological Classification in the Stellar Mass Domain.
Daddi, E.; Elbaz, D.; Le Floc'h, E. +6 more
At z ≳ 1, the distinction between merging and “normal” star-forming galaxies based on single band morphology is often hampered by the presence of large clumps which result in a disturbed, merger-like appearance even in rotationally supported disks. In this paper we discuss how a classification based on canonical, non-parametric structural indices …
Characterizing the Youngest Herschel-detected Protostars. I. Envelope Structure Revealed by CARMA Dust Continuum Observations
Henning, Thomas; Manoj, P.; Ragan, Sarah E. +8 more
We present Combined Array for Research in Millimeter-wave Astronomy 2.9 mm dust continuum emission observations of a sample of 14 Herschel-detected Class 0 protostars in the Orion A and B molecular clouds, drawn from the PACS Bright Red Sources (PBRS) sample. These objects are characterized by very red 24-70 µm colors and prominent submillim…
Stellar Masses and Star Formation Rates of Lensed, Dusty, Star-forming Galaxies from the SPT Survey
Béthermin, M.; Weiss, A.; Greve, T. R. +18 more
To understand cosmic mass assembly in the universe at early epochs, we primarily rely on measurements of the stellar masses and star formation rates (SFRs) of distant galaxies. In this paper, we present stellar masses and SFRs of six high-redshift (2.8 ≤ z ≤ 5.7) dusty, star-forming galaxies (DSFGs) that are strongly gravitationally lensed by fore…
HST/ACS Direct Ages of the Dwarf Elliptical Galaxies NGC 147 and NGC 185
Geha, M.; van der Marel, R. P.; Guhathakurta, P. +3 more
We present the deepest optical photometry for any dwarf elliptical (dE) galaxy based on Hubble Space Telescope Advanced Camera for Surveys (ACS) observations of the Local Group dE galaxies NGC 147 and NGC 185. Our F606W and F814W color-magnitude diagrams are the first to reach below the oldest main sequence turnoff in a dE galaxy, allowing us to d…
Deconstructing Thermal Sunyaev-Zel’dovich - Gravitational Lensing Cross-correlations: Implications for the Intracluster Medium
Battaglia, N.; Hill, J. C.; Murray, N.
Recent first detections of the cross-correlation of the thermal Sunyaev-Zel’dovich (tSZ) signal in Planck cosmic microwave background (CMB) temperature maps with gravitational lensing maps inferred from the Planck CMB data and the CFHTLenS galaxy survey provide new probes of the relationship between baryons and dark matter. Using cosmological hydr…
An HST/COS survey of molecular hydrogen in DLAs & sub-DLAs at z < 1: molecular fraction and excitation temperature
Muzahid, S.; Srianand, R.; Charlton, J.
We present the results of a systematic search for molecular hydrogen (H2) in low-redshift (0.05 ≲ z ≲ 0.7) Damped Lyα absorbers (DLAs) and sub-DLAs with N({H II}) ≳ 10^{19.0} cm-2, in the archival Hubble Space Telescope/Cosmic Origins Spectrograph spectra. Our core sample is comprised of 27 systems with a median log N({H I}) …
On the Statistical Relationship Between CME Speed and Soft X-Ray Flux and Fluence of the Associated Flare
Klein, K. -L.; Salas-Matamoros, C.
Observation and theory both reveal a close relationship between the kinematics of coronal mass ejections (CMEs) and the thermal energy release traced by the related soft X-ray (SXR) emission. A major problem of empirical studies of this relationship is the distortion of the CME speed by the projection effect in the coronagraphic measurements. We p…
Dark side of comet 67P/Churyumov-Gerasimenko in Aug.-Oct. 2014. MIRO/Rosetta continuum observations of polar night in the southern regions
Jorda, L.; Sierks, H.; Keller, H. U. +20 more
The high obliquity (~50°) of comet 67P/Churyumov-Gerasimenko (67P) is responsible for a long-lasting winter polar night in the southern regions of the nucleus. We report observations made with the submillimeter and millimeter continuum channels of the Microwave Instrument onboard the Rosetta Orbiter (MIRO) of the thermal emission from these region…