Search Publications
An Hα Nuclear Spiral Structure in the E0 Active Galaxy Arp 102B
Robinson, Andrew; Marconi, Alessandro; Axon, David J. +5 more
We report the discovery of a two-armed mini-spiral structure within the inner kiloparsec of the E0 LINER/Seyfert 1 galaxy Arp 102B. The arms are observed in Hα emission and located east and west of the nucleus, extending up to ≈1 kpc from it. We use narrow-band imaging from the Hubble Space Telescope Advanced Camera for Surveys, in combination wit…
Observations of Five-minute Solar Oscillations in the Corona Using the Extreme Ultraviolet Spectrophotometer (ESP) On Board the Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment (SDO/EVE)
Kosovichev, A. G.; Didkovsky, L.; Judge, D. +2 more
We report on the detection of oscillations in the corona in the frequency range corresponding to five-minute acoustic modes of the Sun. The oscillations have been observed using soft X-ray measurements from the Extreme Ultraviolet Spectrophotometer (ESP) of the Extreme Ultraviolet Variability Experiment on board the Solar Dynamics Observatory. The…
A Unique X-Ray Unabsorbed Seyfert 2 Galaxy: IRAS F01475-0740
Wang, Jun-Xian; Yang, Huan; Huang, Ya-Fang +2 more
X-ray unabsorbed Seyfert 2 galaxies appear to have X-ray absorption column densities that are too low (N H < 1022 cm-2) to explain the absence of broad emission lines in their optical spectra, challenging the standard active galactic nucleus (AGN) unification model. In this Letter, we report Suzaku exposure on t…
Mid-J CO Emission from NGC 891: Microturbulent Molecular Shocks in Normal Star-forming Galaxies
Tucker, C.; Stacey, G. J.; Brisbin, D. +4 more
We have detected the CO(6-5), CO(7-6), and [C I] 370 µm lines from the nuclear region of NGC 891 with our submillimeter grating spectrometer ZEUS on the Caltech Submillimeter Observatory. These lines provide constraints on photodissociation region (PDR) and shock models that have been invoked to explain the H2 S(0), S(1), and S(2)…
Supermodel Analysis of the Hard X-ray Excess in the Coma Cluster
Orlandini, M.; Lapi, A.; Bonamente, M. +1 more
The Supermodel (SM) provides an accurate description of the thermal contribution by the hot intracluster plasma which is crucial for the analysis of the hard excess. In this paper, the thermal emissivity in the Coma cluster is derived starting from the intracluster gas temperature and density profiles obtained by the SM analysis of X-ray observabl…
Detection of X-rays from the Symbiotic Star V1329 Cyg
Sokoloski, Jennifer L.; Stute, Matthias; Luna, Gerardo J. M.
We report the detection of X-ray emission from the symbiotic star V1329 Cyg with XMM-Newton. The spectrum from the EPIC pn, MOS1, and MOS2 instruments consists of a two-temperature plasma with k T 1 = 0.11+0.02 -0.02 keV and k T 2 = 0.93+0.12 -0.14 keV. Unlike the vast majority of s…
A Suzaku Observation of MCG -2-58-22: Constraining the Geometry of the Circumnuclear Material
Rivers, Elizabeth; Markowitz, Alex; Rothschild, Richard
We have analyzed a long-look Suzaku observation of the active galactic nucleus MCG -2-58-22, a type 1.5 Seyfert with very little X-ray absorption in the line of sight and prominent features arising from reflection off circumnuclear material: the Fe line and Compton reflection hump. We place tight constraints on the power-law photon index (Γ = 1.80…
Updated Analysis of the Upwind Interplanetary Hydrogen Velocity as Observed by the Hubble Space Telescope during Solar Cycle 23
Harris, Walter M.; Ben-Jaffel, Lotfi; Vincent, Frédéric E.
The interplanetary hydrogen (IPH), a population of neutrals that fill the space between planets inside the heliosphere, carries the signature of the interstellar medium (ISM) and the heliospheric interface. As the incoming ISM-ionized component deflects at the heliopause, charge exchange reactions decelerate the bulk motion of the neutrals that pe…
Confirmation of IGR J01363+6610 as a Be X-ray Binary with Very Low Quiescent X-ray Luminosity
Kaaret, Philip; Heinke, Craig; Bodaghee, Arash +4 more
The field containing the candidate High Mass X-ray Binary IGR J01363+6610 was observed by XMM-Newton on 2009 July 31 for 28 ks. A Be star was previously suggested as the possible counterpart of the INTEGRAL source, and although Chandra, during a 2007 observation, did not detect an X-ray source at the position of the Be star, we find a variable sou…
Search for the Optical Counterpart to SGR 0418+5729
Pavlov, George G.; Kargaltsev, Oleg; Durant, Martin
We report broadband Hubble Space Telescope imaging of the field of soft γ-ray repeater SGR 0418+5729 with Advanced Camera for Surveys/Wide Field Channel and Wide Field Camera 3/IR. Observing in two wide filters, F606W and F110W, we find no counterpart within the positional error circle derived from Chandra observations, to limiting magnitudes m