Search Publications
Characterizing Transition Temperature Gas in the Galactic Corona
Savage, Blair D.; Fox, Andrew J.; Wakker, Bart P. +2 more
We present a study of the properties of the transition temperature (T ~ 105 K) gas in the Milky Way corona, based on the measurements of O VI, N V, C IV, Si IV, and Fe III absorption lines seen in the far-ultraviolet spectra of 58 sight lines to extragalactic targets, obtained with the Far-Ultraviolet Spectroscopic Explorer and the Spac…
Herschel-PACS Observations of Far-IR CO Line Emission in NGC 1068: Highly Excited Molecular Gas in the Circumnuclear Disk
Lutz, D.; Genzel, R.; Poglitsch, A. +13 more
We report the detection of far-IR CO rotational emission from the prototypical Seyfert 2 galaxy NGC 1068. Using Herschel-PACS, we have detected 11 transitions in the J upper = 14-30 (E upper/kB = 580-2565 K) range, all of which are consistent with arising from within the central 10'' (700 pc). The detected transiti…
Signatures of minor mergers in Milky Way like disc kinematics: ringing revisited
Gómez, Facundo A.; Minchev, Ivan; O'Shea, Brian W. +2 more
By means of N-body simulations, we study the response of a galactic disc to a minor merger event. We find that non-self-gravitating, spiral-like features are induced in the thick disc. As we have shown in a previous work, this 'ringing' also leaves an imprint in velocity space (the u-v plane) in small spatial regions, such as the solar neighbourho…
The dust energy balance in the edge-on spiral galaxy NGC 4565
Gordon, Karl D.; De Looze, Ilse; Baes, Maarten +20 more
We combine new dust continuum observations of the edge-on spiral galaxy NGC 4565 in all Herschel/Spectral and Photometric Imaging Receiver (250, 350 and 500 µm) wavebands, obtained as part of the Herschel Reference Survey, and a large set of ancillary data (Spitzer, Sloan Digital Sky Survey, Galaxy Evolution Explorer) to analyse its dust ene…
The Disk-wind-Jet Connection in the Black Hole H 1743-322
Fabian, A. C.; Miller, J. M.; Reynolds, C. S. +6 more
X-ray disk winds are detected in spectrally soft, disk-dominated phases of stellar-mass black hole outbursts. In contrast, compact, steady, relativistic jets are detected in spectrally hard states that are dominated by non-thermal X-ray emission. Although these distinctive outflows appear to be almost mutually exclusive, it is possible that a disk…
Discovery of the benchmark metal-poor T8 dwarf BD +01° 2920B
Marocco, F.; Homeier, D.; Pinfield, D. J. +20 more
We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (≤10 000 au) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H] =-0.38 ± 0.06) primary BD +01° 2920 (HIP 703…
Comparison of line-by-line and band models of near-IR methane absorption applied to outer planet atmospheres
Sromovsky, L. A.; Fry, P. M.; Boudon, V. +2 more
Recent improvements in high spectral resolution measurements of methane absorption at wavenumbers between 4800 cm-1 and 7919 cm-1 have greatly increased the number of lines with known lower state energies, the number of weak lines, and the number of lines observed at low temperatures (Campargue, A., Wang, L., Kassi, S., Mašát…
The Nuclear Infrared Emission of Low-luminosity Active Galactic Nuclei
Colina, L.; Aretxaga, I.; Packham, C. +9 more
We present high-resolution mid-infrared (MIR) imaging, nuclear spectral energy distributions (SEDs), and archival Spitzer spectra for 22 low-luminosity active galactic nuclei (LLAGNs; L bol <~ 1042 erg s-1). Infrared (IR) observations may advance our understanding of the accretion flows in LLAGNs, the fate of th…
Assembly of the Red Sequence in Infrared-selected Galaxy Clusters from the IRAC Shallow Cluster Survey
Dey, Arjun; Jannuzi, Buell; Eisenhardt, Peter R. M. +9 more
We present results for the assembly and star formation histories (SFHs) of massive (~L*) red sequence galaxies (RSGs) in 11 spectroscopically confirmed, infrared-selected galaxy clusters at 1.0 < z < 1.5, the precursors to present-day massive clusters with M ~ 1015 M ⊙. Using rest-frame optical photometry, we investigat…
Behavior of Solar Cycles 23 and 24 Revealed by Microwave Observations
Gopalswamy, N.; Michalek, G.; Shibasaki, K. +3 more
Using magnetic and microwave butterfly diagrams, we compare the behavior of solar polar regions to show that (1) the polar magnetic field and the microwave brightness temperature during solar minimum substantially diminished during the cycle 23/24 minimum compared to the 22/23 minimum. (2) The polar microwave brightness temperature (Tb) seems to b…