Search Publications
Magnetic Flux in the Solar Convective Envelope Inferred from Initial Observations of Sunspots
Hiremath, K. M.; Lovely, M. R.
Different life spans of sunspots suggest their origin at different depths, and by measuring magnetic fluxes from their first observation on the surface, one can estimate the strength of magnetic flux at different anchoring depths. From SOHO MDI magnetograms, we infer the strength of magnetic flux and rate of emergence of magnetic flux at different…
Rest-Frame Ultraviolet to Near-Infrared Observations of an Interacting Lyman Break Galaxy at z=4.42
Shapley, Alice E.; Hernquist, Lars; Fazio, Giovanni G. +11 more
We present the rest-frame ultraviolet through near-infrared spectral energy distribution for an interacting Lyman break galaxy at a redshift z=4.42, the highest redshift merging system known with clearly resolved tidal features. The two objects in this system, HDF-G4 and its previously unidentified companion, are both B435-band dropouts…
Discovery of Extended Emission around the Pulsar B0355+54
Ögelman, H.; Tepedelenliǧlu, E.
PSR B0355+54 is one of the handful of pulsars that have been observed with both Chandra and XMM-Newton. The analysis of the archival data has revealed the pulsar and a ~30" compact nebula surrounding it. XMM-Newton also has detected a trail that extends ~6' and, similar to the compact nebula, is also counteraligned with the proper motion of the pu…
AEGIS: Galaxy Spectral Energy Distributions from the X-Ray to Radio
Ivison, R. J.; Cooper, M. C.; Huang, J. -S. +15 more
The All-Wavelength Extended Groth Strip International Survey (AEGIS) team presents broadband spectral energy distributions (SEDs), from X-ray to radio wavelengths, for 71 galaxies spanning the redshift range 0.55-1.16 (<z>~0.7). Galaxies with secure redshifts are selected from a small (22 arcmin2) subsection of the Keck/DEIMOS Gal…
The Unusual Variability of the Large Magellanic Cloud Planetary Nebula RPJ 053059-683542
Rest, Armin; Parker, Quentin A.; Smith, R. Chris +3 more
We present images and light curves of the bipolar planetary nebula RPJ 053059-683542 that was discovered in the Reid-Parker AAO UKST Hα survey of the Large Magellanic Cloud. The emission from this object appears entirely nebular, with the central star apparently obscured by a central band of absorption that bisects the nebula. The light curves, wh…
Spitzer IRS Imaging and Spectroscopy of the Luminous Infrared Galaxy NGC 6052 (Mrk 297)
Houck, J. R.; Charmandaris, V.; Whelan, D. G. +2 more
We present photometric and spectroscopic data of the interacting starburst galaxy NGC 6052 obtained with the Spitzer Space Telescope. The mid-infrared (MIR) spectra of the three spatially resolved regions in the galaxy are remarkably similar and are consistent with dust emission from young, nearly coeval stellar populations. Analysis of the bright…
α TrA Junior
Ayres, Thomas R.; Harper, Graham M.; Brown, Alexander
The ``hybrid chromosphere'' star α Trianguli Australis (K2 Ib-IIa) displays atypical coronal properties for its class: elevated soft X-ray emission, flare outbursts, and a superhot (T~10 MK) spectrum. The Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST) now has found a faint object close to the red supergiant, 0.4" n…
Imaging Spectroscopy of a Gradual Hardening Flare on 2000 November 25
Masuda, Satoshi; Nakajima, Hiroshi; Yokoyama, Takaaki +5 more
We present an examination of multiwavelength observations of an M8.2 long-duration flare which occurred on 2000 November 25. During the flare, we can see a hard X-ray (HXR) source on one Hα flare ribbon in the HXR images obtained with the Hard X-ray Telescope aboard Yohkoh, and a compact microwave emission source on the other flare ribbon in the d…
The Effect of Proton Temperature Anisotropy on the Electron Heat Flux Dissipation in Solar Coronal Holes
Markovskii, S. A.
A possible source of the ion cyclotron waves that energize the protons in the fast solar wind is the electron heat flux launched by reconnection events at the base of coronal holes. A strong enough heat flux becomes unstable and generates cyclotron waves that interact with the protons. When the protons are energized via the cyclotron resonance, th…
Identification of a Peculiar Radio Source in the Aftermath of Large Coronal Mass Ejection Events
Vourlidas, Angelos; Démoulin, Pascal; Hoang, Sang +1 more
We report the discovery of a new radio feature associated with coronal mass ejection (CME) events. The feature is a low-frequency (<1 MHz), relatively wide (~300 kHz) continuum that appears just after the main phase of the eruptive event, lasts for several hours, and exhibits a slow negative frequency drift. So far, we have identified this radi…