Search Publications
The 0.5-2.22 µm Scattered Light Spectrum of the Disk around TW Hya: Detection of a Partially Filled Disk Gap at 80 AU
Weinberger, Alycia J.; Debes, John H.; Roberge, Aki +2 more
We present a 0.5-2.2 µm scattered light spectrum of the circumstellar disk around TW Hya from a combination of spatially resolved Hubble Space Telescope STIS spectroscopy and NICMOS coronagraphic images of the disk. We investigate the morphology of the disk at distances >40 AU over this wide range of wavelengths, and identify the presence…
The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450-µm-selected galaxies and their contribution to the cosmic infrared background
Ivison, R. J.; Clements, D. L.; Smail, Ian +50 more
The first deep blank-field 450 µm map (1σ ≈ 1.3 mJy) from the Submillimetre Common-User Bolometer Array-2 SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin2 of the Cosmological Evolution Survey field, in the footprint of the Hubble Space Telesco…
The Structure, Origin, and Evolution of Interstellar Hydrocarbon Grains
Tielens, A. G. G. M.; Chiar, J. E.; Ricca, A. +1 more
Many materials have been considered for the carrier of the hydrocarbon absorption bands observed in the diffuse interstellar medium (ISM). In order to refine the model for ISM hydrocarbon grains, we analyze the observed aromatic (3.28, 6.2 µm) and aliphatic (3.4 µm) hydrocarbon absorption features in the diffuse ISM along the line of s…
Peanuts at an angle: detecting and measuring the three-dimensional structure of bars in moderately inclined galaxies
Debattista, Victor P.; Erwin, Peter
We show that direct detection and measurement of the vertically thickened parts of bars (so-called `boxy' or `peanut-shaped' bulges) are possible not only for edge-on galaxies but also for galaxies with moderate inclinations (i < 70°), and that examples are relatively common in the nearby Universe. The analysis of a sample of 78 nearby, moderat…
Kinetic analysis of the energy transport of bursty bulk flows in the plasma sheet
Zhang, Tielong; Ma, Yuduan; Cao, Jinbin +3 more
The energy transport of bursty bulk flows (BBFs) is very important to the understanding of substorm energy transport. Previous studies all use the MHD bulk parameters to calculate the energy flux density of BBFs. In this paper, we use the kinetic approach, i.e., ion velocity distribution function, to study the energy transport of an earthward burs…
Mid-infrared Atomic Fine-structure Emission-line Spectra of Luminous Infrared Galaxies: Spitzer/IRS Spectra of the GOALS Sample
Veilleux, S.; Inami, H.; Armus, L. +18 more
We present the data and our analysis of mid-infrared atomic fine-structure emission lines detected in Spitzer/Infrared Spectrograph high-resolution spectra of 202 local Luminous Infrared Galaxies (LIRGs) observed as part of the Great Observatories All-sky LIRG Survey (GOALS). We readily detect emission lines of [S IV], [Ne II], [Ne V], [Ne III], […
Suzaku Observations of the Diffuse X-Ray Emission across the Fermi Bubbles' Edges
Cheung, C. C.; Kataoka, J.; Stawarz, Ł. +10 more
We present Suzaku X-ray observations along two edge regions of the Fermi Bubbles, with eight ~= 20 ks pointings across the northern part of the North Polar Spur (NPS) surrounding the north bubble and six across the southernmost edge of the south bubble. After removing compact X-ray features, diffuse X-ray emission is clearly detected and is well r…
The Influence of Dark Matter Halos on Dynamical Estimates of Black Hole Mass: 10 New Measurements for High-σ Early-type Galaxies
Saglia, R. P.; Nowak, N.; Thomas, J. +7 more
Adaptive optics assisted SINFONI observations of the central regions of 10 early-type galaxies are presented. Based primarily on the SINFONI kinematics, 10 black hole (BH) masses occupying the high-mass regime of the M BH-σ relation are derived using three-integral Schwarzschild models. The effect of dark matter (DM) inclusion on the BH…
The origin of the lag spectra observed in AGN: Reverberation and the propagation of X-ray source fluctuations
Fabian, A. C.; Wilkins, D. R.
The X-ray emission from active galactic nuclei (AGN) is highly variable. Measurements of time lags (characterized by lag spectra) between variability in the light curves in energy bands corresponding to directly observed continuum emission from the corona around the black hole and to X-rays reflected from the accretion disc add a further dimension…
DIGIT survey of far-infrared lines from protoplanetary disks. I. [O i], [C ii], OH, H2O, and CH+
Güdel, M.; Fedele, D.; Henning, Th. +10 more
We present far-infrared (50-200 µm) spectroscopic observations of young pre-main-sequence stars taken with Herschel/PACS as part of the DIGIT key project. The sample includes 16 Herbig AeBe and 4 T Tauri sources observed in SED mode covering the entire spectral range. An additional 6 Herbig AeBe and 4 T Tauri systems have been observed in SE…