Search Publications
Triggering Process of the X1.0 Three-ribbon Flare in the Great Active Region NOAA 12192
Kusano, Kanya; Shiota, Daikou; Inoue, Satoshi +1 more
The solar magnetic field in a flare-producing active region (AR) is much more complicated than theoretical models, which assume a very simple magnetic field structure. The X1.0 flare, which occurred in AR 12192 on 2014 October 25, showed a complicated three-ribbon structure. To clarify the trigger process of the flare and to evaluate the applicabi…
ALMA Observations of the Interaction of a Radio Jet with Molecular Gas in Minkowski's Object
Nyland, Kristina; Lacy, Mark; Croft, Steve +2 more
We use the Atacama Large Millimeter Array (ALMA) to detect and image CO (1-0) emission from Minkowski’s Object, a dwarf galaxy in the cluster Abell 194 that is interacting with a radio jet from a nearby elliptical galaxy. The ALMA observations, which are the first to detect molecular gas in Minkowski’s Object, also image the high-frequency continu…
A Potential Recoiling Supermassive Black Hole, CXO J101527.2+625911
Kim, D. -C.; Kim, Ji Hoon; Privon, G. C. +4 more
We have carried out a systematic search for recoiling supermassive black holes (rSMBH) using the Chandra Source and SDSS Cross-Match Catalog. From the survey, we have detected a potential rSMBH, CXO J101527.2+625911, at z = 0.3504. The source CXO J101527.2+625911 has a spatially offset (1.26 ± 0.05 kpc) active SMBH and kinematically offset broad e…
Characteristics that Produce White-light Enhancements in Solar Flares Observed by Hinode/SOT
Masuda, Satoshi; Watanabe, Kyoko; Kitagawa, Jun
To understand the conditions that produce white-light (WL) enhancements in solar flares, a statistical analysis of visible continuum data as observed by Hinode/Solar Optical Telescope (SOT) was performed. In this study, approximately 100 flare events from M- and X-class flares were selected. The time period during which the data were recorded span…
Spectroscopy of Very Hot Plasma in Non-flaring Parts of a Solar Limb Active Region: Spatial and Temporal Properties
Teriaca, Luca; Testa, Paola; Petralia, Antonino +4 more
In this work we investigate the thermal structure of an off-limb active region (AR) in various non-flaring areas, as it provides key information on the way these structures are heated. In particular, we concentrate on the very hot component (> 3 {MK}) as it is a crucial element to distinguish between different heating mechanisms. We present an …
Heating of an Erupting Prominence Associated with a Solar Coronal Mass Ejection on 2012 January 27
Moon, Yong-Jae; Reeves, Katharine K.; Raymond, John C. +2 more
We investigate the heating of an erupting prominence and loops associated with a coronal mass ejection and X-class flare. The prominence is seen as absorption in EUV at the beginning of its eruption. Later, the prominence changes to emission, which indicates heating of the erupting plasma. We find the densities of the erupting prominence using the…
Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
Oswalt, T. D.; Zhao, G.; Zhang, L. +3 more
We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS catalogs and obtained a sample of 166,827 stars with reliable kinematics. A technique based on the wavelet transform was applied to detect significant overdensities in velocity space among five subsamples divided by spatial position. In total, 16 significant overdensities of stars with ve…
Crowded Field Galaxy Photometry: Precision Colors in the CLASH Clusters
Koekemoer, Anton M.; Donahue, Megan; Voit, G. Mark +8 more
We present a new method for photometering objects in galaxy clusters. We introduce a mode-filtering technique for removing spatially variable backgrounds, improving both detection and photometric accuracy (roughly halving the scatter in the red sequence compared to previous catalogs of the same clusters). This method is based on robustly determini…
Chromospherically Active Stars in the RAVE Survey. II. Young Dwarfs in the Solar Neighborhood
Gilmore, G.; Freeman, K. C.; Munari, U. +19 more
A large sample of over 38,000 chromospherically active candidate solar-like stars and cooler dwarfs from the RAVE survey is addressed in this paper. An improved activity identification with respect to the previous study was introduced to build a catalog of field stars in the solar neighborhood with an excess emission flux in the calcium infrared t…
Probing the Cold Dust Emission in the AB Aur Disk: A Dust Trap in a Decaying Vortex?
Cernicharo, José; Fuente, Asunción; Baruteau, Clément +6 more
One serious challenge for planet formation is the rapid inward drift of pebble-sized dust particles in protoplanetary disks. Dust trapping at local maxima in the disk gas pressure has received much theoretical attention but still lacks observational support. The cold dust emission in the AB Aur disk forms an asymmetric ring at a radius of about 12…