Search Publications
Ultra-long-period Oscillations in EUV Filaments Near to Eruption: Two-wavelength Correlation and Seismology
Foullon, C.; Nakariakov, V. M.; Verwichte, E.
We investigate whether or not ultra-long-period oscillations in EUV filaments can be related to their eruption. We report new observations of long-period (~10-30 hr) oscillatory motions in an apparently quiescent filament, as it crosses the solar disk in a 12 minute cadence SOHO/Extreme-Ultraviolet Imaging Telescope (EIT) 195 Å uninterrupted data …
The Connection Between a Lyman Limit System, a Very Strong O VI Absorber, and Galaxies at z ~ 0.203
Lehner, N.; Prochaska, J. X.; Kobulnicky, H. A. +4 more
With a column density log N(O VI) = 14.95 ± 0.05, the O VI absorber at z abs sime 0.2028 observed toward the quasi-stellar object PKS 0312-77 (z em = 0.223) is the strongest yet detected at z < 0.5. At nearly identical redshift (z abs sime 0.2026), we also identify a Lyman limit system (LLS, log N(H I) = 18.22
Abell 851 and the Role of Starbursts in Cluster Galaxy Evolution
Smail, Ian; Fritz, Jacopo; Dressler, Alan +5 more
We use extensive new observations of the very rich z ~ 0.4 cluster of galaxies A851 to examine the nature and origin of starburst galaxies in intermediate-redshift clusters. New HST observations, 24 µm Spitzer photometry and ground-based spectroscopy cover most of a region of the cluster about 10' across, corresponding to a cluster-centric r…
Hubble Space Telescope Morphologies of z ~ 2 Dust Obscured Galaxies. I. Power-Law Sources
Le Floc'h, E.; Armus, L.; Dey, Arjun +12 more
We present high-spatial resolution optical and near-infrared imaging obtained using the ACS, WFPC2, and NICMOS cameras aboard the Hubble Space Telescope of 31 24 µm bright z ≈ 2 Dust Obscured Galaxies (DOGs) identified in the Boötes Field of the NOAO Deep Wide-Field Survey. Although this subset of DOGs have mid-IR spectral energy distributio…
Serendipitous Discovery of an Overdensity of Lyα Emitters at z ~ 4.8 in the CL1604 Supercluster Field
Kocevski, D.; Sawicki, M.; Fassnacht, C. D. +6 more
We present results of a spectroscopic search for Lyα emitters (LAEs) in the Cl1604 supercluster field using the extensive spectroscopic Keck/DEep Imaging Multi-Object Spectrograph database taken as part of the Observations of Redshift Evolution in Large-Scale Environments survey. A total of 12 slitmasks were observed and inspected in the Cl1604 fi…
The Nature of Dusty Starburst Galaxies in a Rich Cluster at z = 0.4: The Progenitors of Lenticulars?
Treu, Tommaso; Smail, Ian; Ellis, Richard S. +2 more
We present the results of a Spitzer Infrared Spectrograph survey of 24 µm selected luminous infrared galaxies (LIRGs, L IR > 1011 L sun) in the rich cluster Cl 0024+16 at z = 0.4. Optically, these LIRGs resemble unremarkable spiral galaxies with e(a)/e(c) spectral classifications and [O II]-derived star fo…
High-Resolution Mid-Infrared Spectroscopy of NGC 7538 IRS 1: Probing Chemistry in a Massive Young Stellar Object
van Dishoeck, Ewine F.; Evans, Neal J., II; Lacy, John H. +2 more
We present high-resolution (R = 75,000-100,000) mid-infrared spectra of the high-mass embedded young star IRS 1 in the NGC 7538 star-forming region. Absorption lines from many rotational states of C2H2, 13C12CH2, CH3, CH4, NH3, HCN, HNCO, and CS are seen. The g…
Dust Production and Mass Loss in the Galactic Globular Cluster NGC 362
Gordon, Karl D.; Boyer, Martha L.; Meixner, Margaret +14 more
We investigate dust production and stellar mass loss in the Galactic globular cluster NGC 362. Due to its close proximity to the Small Magellanic Cloud (SMC), NGC 362 was imaged with the Infrared Array Camera and Multiband Imaging Photometer cameras onboard the Spitzer Space Telescope as part of the Surveying the Agents of Galaxy Evolution (SAGE-S…
A Universal Luminosity Function for Radio Supernova Remnants
Chomiuk, Laura; Wilcots, Eric M.
We compile radio supernova remnant (SNR) samples from the literature for 19 nearby galaxies ranging from the SMC to Arp 220, and use this data to constrain the SNR luminosity function (LF) at 20 cm. We find that radio SNR populations are strikingly similar across galaxies. The LF can be described as a power law with constant index and scaling prop…
Three-Dimensional Magnetohydrodynamic Models of Twisted Multithreaded Coronal Loop Oscillations
Ofman, L.
The multithreaded structure of active region coronal loops was deduced from past spectroscopic observations. Recent high-resolution observations by Transition Region and Coronal Explorer and Hinode satellites provided direct evidence that active region loops consist of multiple magnetic threads filled with plasma with higher density than neighbori…