Search Publications
An Embedded Active Nucleus in the OH Megamaser Galaxy IRAS16399-0937
Axon, D. J.; Robinson, A.; Elitzur, M. +7 more
We present a multiwavelength study of the OH megamaser galaxy IRAS16399-0937, based on new Hubble Space Telescope (HST)/Advanced Camera for Surveys F814W and Hα+[N II] images and archive data from HST, Two Micron All Sky Survey, Spitzer, Herschel and the Very Large Array. This system has a double nucleus, whose northern (IRAS16399N) and southern (…
Inflation and dark energy from the Brans-Dicke theory
Artymowski, Michał; Lalak, Zygmunt; Lewicki, Marek
We consider the Brans-Dicke theory motivated by the f(R) = R + α Rn - β R2-n model to obtain a stable minimum of the Einstein frame scalar potential of the Brans-Dicke field. As a result we have obtained an inflationary scalar potential with non-zero value of residual vacuum energy, which may be a source of dark energy. In ad…
Do we detect the galactic feedback material in X-ray observations of nearby galaxies? - a case study of NGC 5866
Li, Jiang-Tao
One of the major sources of the X-ray emitting hot gas around galaxies is the feedback from supernovae (SNe), but most of this metal-enriched feedback material is often not directly detected in X-ray observations. This missing galactic feedback problem is extremely prominent in early-type galaxy bulges, where there is little cool gas to make the T…
High-Resolution Observations of a Flux Rope with the Interface Region Imaging Spectrograph
Li, Ting; Zhang, Jun
We report the observations of a flux rope at transition region temperatures with the Interface Region Imaging Spectrograph (IRIS) on 30 August 2014. Initially, magnetic flux cancellation continually took place and a filament was activated. Then the bright material from the filament moved southward and tracked out several fine structures. These fin…
Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus
Gary, S. Peter; Fu, Xiangrong; Dong, Chuanfei +1 more
An interesting characteristic of magnetospheric chorus is the presence of a frequency gap at ω≃0.5Ωe, where Ωe is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near 0.3Ωe and 0.6Ωe. Here we present a novel nonlinear mechanism for the formation of thes…
Characterization of the lower layer in the dayside Venus ionosphere and comparisons with Mars
Tellmann, Silvia; Pätzold, Martin; Häusler, Bernd +3 more
The influence of solar zenith angle (SZA) and solar irradiance has been well characterized for the V2 layer in the Venus ionosphere, but not the V1 layer, where previous efforts were limited by data scarcity and incomplete SZA coverage. Here we use more than 200 radio occultation profiles from Venus Express with good SZA coverage to characterize h…
Probing the Physical Properties of z = 4.5 Lyman Alpha Emitters with Spitzer
Finkelstein, Steven L.; Grogin, Norman A.; Tilvi, Vithal +10 more
We present the results from a stellar population modeling analysis of a sample of 162 z = 4.5 and 14 z = 5.7 Lyα emitting galaxies (LAEs) in the Boötes field, using deep Spitzer/IRAC data at 3.6 and 4.5 µm from the Spitzer Lyα Survey, along with Hubble Space Telescope NICMOS and WFC3 imaging at 1.1 and 1.6 µm for a subset of the LAEs. …
The Schmidt Law in Six Galactic Massive Star-forming Regions
Marengo, M.; Smith, H. A.; Allen, L. +3 more
We present a census of young stars in five massive star-forming regions in the 4th Galactic quadrant, G305, G326-4, G326-6, G333 (RCW 106), and G351, and combine this census with an earlier census of young stars in NGC 6334. Each region was observed at J, H, and Ks with the NOAO Extremely Wide-Field Infrared Imager and combined with dee…
Cross-correlation of CFHTLenS galaxy catalogue and Planck CMB lensing using the halo model prescription
Kuntz, Adrien
Aims: I cross-correlate the galaxy counts from the Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) galaxy catalogue and cosmic microwave background (CMB) convergence from the Planck data releases 1 (2013) and 2 (2015).
Methods: I improve on an earlier study by computing an analytic covariance from the halo model, implementing si…
A Newly Recognized Very Young Supernova Remnant in M83
Soria, Roberto; Blair, William P.; Whitmore, Bradley C. +7 more
As part of a spectroscopic survey of supernova remnant candidates in M83 using the Gemini-South telescope and Gemini Multi-Object Spectrograph, we have discovered one object whose spectrum shows very broad lines at Hα, [O I] λλ6300, 6363, and [O III] λλ4959, 5007, similar to those from other objects classified as "late time supernovae". Although s…