Search Publications
Evolution of the Outflows in NGC 3516
Kraemer, S. B.; Dunn, Jay P.; Parvaresh, Rozhin +1 more
We analyze the 2011 HST/COS spectrum of the Seyfert 1 galaxy NGC 3516, which demonstrates clear changes in one of the intrinsic absorption troughs (component 5), slight evidence of change in a second trough (component 6), and the appearance of a new absorption trough (component 9). We interpret both the changes and the appearance of the new trough…
Dust Production Rates in the Fomalhaut Debris Disk from SOFIA/FORCAST Mid-infrared Imaging
Lau, R. M.; Herter, T. L.; Adams, J. D. +2 more
We present the first spatially resolved mid-infrared (37.1 µm) image of the Fomalhaut debris disk. We use point spread function fitting and subtraction to distinctly measure the flux from the unresolved component and the debris disk. We measure an infrared excess in the point source of 0.9 ± 0.2 Jy, consistent with emission from warm dust in…
Ultraviolet Flux Decrease Under a Grand Minimum from IUE Short-wavelength Observation of Solar Analogs
Melis, Carl; Tytler, David; Lubin, Dan
We have identified a sample of 33 Sun-like stars observed by the International Ultraviolet Explorer (IUE) with the short-wavelength spectrographs that have ground-based detections of chromospheric Ca II H+K activity. Our objective is to determine if these observations can provide an estimate of the decrease in ultraviolet (UV) surface flux associa…
Spatially Extended Low-ionization Emission Regions (LIERs) at z ∼ 0.9
Marchesini, Danilo; Momcheva, Ivelina G.; Brammer, Gabriel B. +9 more
We present spatially resolved emission diagnostics for eight z ∼ 0.9 galaxies that demonstrate extended low-ionization emission line regions over kpc scales. Eight candidates are selected based on their spatial extent and emission line fluxes from slitless spectroscopic observations with the Hubble Space Telescope/Wide Field Camera 3 G141 and G800…
J0453-6655, the Supernova Remnant in N4D
Points, S. D.; Murray, S. S.; Smith, R. K. +4 more
The Large Magellanic Cloud supernova remnant J0453-6655 in the H II region N4 has been observed with XMM-Newton and with Chandra. Almost all of the diffuse X-ray emission is from within a 3.‧5 × 2.‧3 region of bright optical filaments, and X-ray results from XMM-Newton and Chandra are very similar. Spectra indicate that the plasma is close to equi…
Variability and Jet Activity in the YSO MHO 3252 Y3 in Serpens South
Hodapp, Klaus W.; Chini, Rolf
The infrared young stellar outflow source MHO 3252 Y3 in the Serpens South star-forming region was found to be variable. The available photometric data can be fitted with a double-peaked light curve with a period of 904 days. Color variations are consistent with variable extinction with a flatter wavelength dependence than interstellar extinction,…
A Solar Eruption with Relatively Strong Geoeffectiveness Originating from Active Region Peripheral Diffusive Polarities
Wang, Rui; Liu, Ying D.; Hu, Huidong +1 more
We report the observations of a moderate but relatively intense geoeffective solar eruption on 2015 November 4 from the peripheral diffusive polarities of active region 12443. We use space-borne Solar Dynamics Observatory and ACE observations. EUV images identified a helical pattern along a filament channel, and we regard this channel as flux-rope…
The Intricate Structure of HH 508, the Brightest Microjet in the Orion Nebula
Kim, Jinyoung Serena; Close, Laird M.; Males, Jared R. +2 more
We present Magellan adaptive optics Hα imaging of HH 508, which has the highest surface brightness among protostellar jets in the Orion Nebula. We find that HH 508 actually has a shorter component to the west, and a longer and knotty component to the east. The east component has a kink at 0.″3 from the jet-driving star θ 1 Ori B2
Observing Galaxy Mergers at the Epoch of Reionization
Kaurov, Alexander A.; Chaikin, Evgenii A.; Tyulneva, Nadezda V.
The galaxies with photometric redshifts observed in a close angular proximity might be either projection coincidences, strongly lensed images of the same galaxy, or separate galaxies that are in a stage of merging. We search for the groups of galaxies in the Hubble Ultra Deep Field (HUDF09) in z ∼ 7 and z ∼ 8 drop-out samples. We find no close pai…
A Spatially Resolved Study of the GRB 020903 Host Galaxy
Levesque, Emily M.; Thorp, Mallory D.
GRB 020903 is a long-duration gamma-ray burst with a host galaxy close enough and extended enough for spatially resolved observations, making it one of less than a dozen GRBs where such host studies are possible. GRB 020903 lies in a galaxy host complex that appears to consist of four interacting components. Here we present the results of spatiall…