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Impact of solar EUV flux on CO Cameron band and CO2+ UV doublet emissions in the dayglow of Mars
Bhardwaj, Anil; Jain, Sonal Kumar
This study is aimed at making a calculation about the impact of the two most commonly used solar EUV flux models - SOLAR2000 (S2K) of Tobiska (2004) and EUVAC model of Richards et al. (1994) - on photoelectron fluxes, volume emission rates, ion densities and CO Cameron and CO2+ UV doublet band dayglow emissions on Mars in thr…
On the Relationship between the Coronal Magnetic Decay Index and Coronal Mass Ejection Speed
Xu, Yan; Liu, Chang; Jing, Ju +1 more
Numerical simulations suggest that kink and torus instabilities are two potential contributors to the initiation and prorogation of eruptive events. A magnetic parameter called the decay index (i.e., the coronal magnetic gradient of the overlying fields above the eruptive flux ropes) could play an important role in controlling the kinematics of er…
Interferometric CO(3-2) Observations toward the Central Region of NGC 1068
Matsushita, Satoki; Hwang, Chorng-Yuan; Espada, Daniel +2 more
We present CO(3-2) interferometric observations of the central region of the Seyfert 2 galaxy NGC 1068 using the Submillimeter Array, together with CO(1-0) data taken with the Owens Valley Radio Observatory Millimeter Array. Both the CO(3-2) and CO(1-0) emission lines are mainly distributed within ~5 arcsec of the nucleus and along the spiral arms…
NGC 5548: Lack of a Broad Fe Kα Line and Constraints on the Location of the Hard X-Ray Source
Liu, Y.; Elvis, M.; Krongold, Y. +2 more
We present an analysis of the co-added and individual 0.7-40 keV spectra from seven Suzaku observations of the Sy 1.5 galaxy NGC 5548 taken over a period of eight weeks. We conclude that the source has a moderately ionized, three-zone warm absorber, a power-law continuum, and exhibits contributions from cold, distant reflection. Relativistic refle…
Thermal infrared properties of classical and type II Cepheids. Diffraction limited 10 µm imaging with VLT/VISIR
Kervella, P.; Mérand, A.; Gallenne, A.
We present new thermal infrared (IR) photometry and spectral energy distributions (SEDs) of eight classical Cepheids (type I) and three type II Cepheids, using VISIR thermal IR photometric measurements, supplemented with literature data. We used the BURST mode of the instrument to get diffraction-limited images at 8.59, 11.25, and 11.85 µm. …
Discovery of Variability of the Progenitor of SN 2011dh in M 51 Using the Large Binocular Telescope
Kochanek, C. S.; Stanek, K. Z.; Gerke, J. R. +1 more
We show that the candidate progenitor of the core-collapse SN 2011dh in M 51 (8 Mpc away) was fading by 0.039 ± 0.006 mag yr-1 during the 3 years prior to the supernova, and that this level of variability is moderately unusual for other similar stars in M 51. While there are uncertainties about whether the true progenitor was a blue com…
Metallicities of Emission-line Galaxies from HST ACS PEARS and HST WFC3 ERS Grism Spectroscopy at 0.6 < z < 2.4
Pirzkal, Nor; Cohen, Seth; Windhorst, Rogier A. +9 more
Galaxies selected on the basis of their emission-line strength show low metallicities, regardless of their redshifts. We conclude this from a sample of faint galaxies at redshifts between 0.6 < z < 2.4, selected by their prominent emission lines in low-resolution grism spectra in the optical with the Advanced Camera for Surveys on the Hubble…
A superburst candidate in EXO 1745-248 as a challenge to thermonuclear ignition models
Altamirano, D.; Degenaar, N.; Wijnands, R. +6 more
We report on Chandra, Rossi X-ray Timing Explorer (RXTE), Swift/Burst Alert Telescope (BAT) and MAXI observations of an X-ray flare of ∼1 d and subsequent outburst of a transient X-ray source observed in 2011 October-November in the globular cluster Terzan 5. We show that the source is the same as the transient that was active in 2000, i.e. the ne…
The peculiar 2011 outburst of the black hole candidate IGR J17091-3624, a GRS 1915+105-like source?
Capitanio, F.; Ferrigno, C.; Bozzo, E. +3 more
We report on the long-term monitoring campaign of the black hole candidate IGR J17091-3624 performed with INTEGRAL and Swift during the peculiar outburst started on 2011 January. We have studied the two-month spectral evolution of the source in detail. Unlike the previous outbursts, the initial transition from the hard to the soft state in 2011 wa…
Mergers and interactions in Sloan Digital Sky Survey type 2 quasars at z∼ 0.3-0.4. SDSS J143027.66-005614.8: a case study
Villar-Martín, M.; Rose, M.; Cabrera Lavers, A. +3 more
We present a compilation of Hubble Space Telescope (HST) images of 58 luminous Sloan Digital Sky Survey (SDSS) type 2 active galactic nuclei (AGNs) at ?. Of these, 42 are type 2 quasars, which is a good representation of all optically selected SDSS type 2 quasars in this z range. We find that the majority of the host galaxies are ellipticals (30/4…