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Interactions of Dust Grains with Coronal Mass Ejections and Solar Cycle Variations of the F-Coronal Brightness
Kahler, S. W.; Ragot, B. R.
The density of interplanetary dust increases sunward to reach its maximum in the F corona, where its scattered white-light emission dominates that of the electron K corona above about 3 Rsolar. The dust will interact with both the particles and fields of antisunward propagating coronal mass ejections (CMEs). To understand the effects of…
A two-arm gaseous spiral in the inner 200 pc of the early-type galaxy NGC 2974: signature of an inner bar
Emsellem, Eric; Ferruit, Pierre; Goudfrooij, Paul
TIGER integral-field spectrography and Hubble Space Telescope Wide Field and Planetary Camera 2 (WFPC2) imaging of the E3 galaxy NGC 2974 are used to derive the kinematics of the stellar and ionized gas components in its central 500 pc. We derive a numerical two-integral distribution function from a multi-Gaussian expansion (MGE) mass model using …
Searching for Embedded Super-Star Clusters in IC 4662, NGC 1705, and NGC 5398
Johnson, Kelsey E.; Indebetouw, Rémy; Pisano, D. J.
Radio observations of IC 4662, NGC 5398, and NGC 1705 are used in combination with optical images to search for extremely young star clusters that are still embedded in their birth material. Radio data were obtained at 3 and 6 cm using the Australia Telescope Compact Array, and optical data were retrieved from the Hubble Space Telescope (HST) arch…
The Mass, Baryonic Fraction, and X-Ray Temperature of the Luminous, High-Redshift Cluster of Galaxies MS 0451.6-0305
Donahue, Megan; Hughes, John P.; Gaskin, Jessica A. +3 more
We present new Chandra X-ray observations of the luminous and cosmologically significant X-ray cluster of galaxies, MS 0451.6-0305, at z=0.5386. Spectral imaging data for the cluster are consistent with an isothermal cluster of (10.0-10.6)+/-1.6 keV, with an intracluster Fe abundance of (0.32-0.40)+/-0.13 solar. The systematic uncertainties, arisi…
Long-duration hectometric type III radio bursts and their association with solar energetic particle (SEP) events
MacDowall, R. J.; Bougeret, J. L.; Lara, A. +3 more
It has recently been suggested by Cane et al. [2002] that a class of type III solar radio bursts, called type III-l, is reliably associated with intense solar energetic particle (SEP) events. They proposed that the causative electrons for these bursts are accelerated in regions of reconnecting magnetic field in the wakes of coronal mass ejections …
A Survey of 557 GHz Water Vapor Emission in the NGC 1333 Molecular Cloud
Bergin, Edwin A.; Kaufman, Michael J.; Melnick, Gary J. +2 more
Using NASA's Submillimeter Wave Astronomy Satellite (SWAS), we have examined the production of water in quiescent and shocked molecular gas through a survey of the 556.936 GHz 110-101 transition of ortho-H2O in the NGC 1333 molecular core. These observations reveal broad emission lines associated with the IRAS 2, I…
Target Selection for SETI. II. Tycho-2 Dwarfs, Old Open Clusters, and the Nearest 100 Stars
Turnbull, Margaret C.; Tarter, Jill C.
We present the full target list and prioritization algorithm developed for use by the microwave search for technological signals at the SETI Institute. We have included the Catalog of Nearby Habitable Stellar Systems (HabCat, described in Paper I), all of the nearest 100 stars and 14 old open clusters. This is further augmented by a subset of the …
Ks Number Counts in the Groth and Coppi Fields
Cardiel, Nicolás; Balcells, Marc; Gallego, Jesús +5 more
We have used William Herschel Telescope/INGRID Ks images on two high-latitude fields, the Coppi and Groth strips, to obtain galaxy number counts over ~180 arcmin2, to a depth of Ks~21.0. Detection efficiency corrections as a function of object size have been calculated on each pointing. We have used a signal-to-noi…
Spectral observations of transient features in the FUV Jovian polar aurora
Clarke, J. T.; Grodent, D.; Gustin, J. +2 more
Images of the Jovian FUV aurora show several morphologically and dynamically different regions. The main oval is usually fairly steady while the high-latitude emission inside the oval can vary over timescales of <1 min. We describe time and spatially resolved spectral observations of the Jovian aurora made with the Space Telescope Imaging Spect…
A Quadruple-Phase Strong Mg II Absorber at z ~ 0.9902 toward PG 1634+706
Charlton, Jane C.; Churchill, Christopher W.; Bond, Nicholas A. +2 more
The z=0.9902 system along the quasar PG 1634+706 line of sight is a strong Mg II absorber [Wr(λ2796)>0.3 Å] with only weak C IV absorption (it is ``C IV-deficient''). To study this system, we used high-resolution spectra from both the Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS) and the Keck I telescope High Res…