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Near-Infrared Synthetic Images of Protostellar Disks and Envelopes
Stassun, K.; Wood, K.; Whitney, B. A. +1 more
We present a grid of near-infrared (IR) synthetic images of pre-main-sequence stars at different stages of evolution, which we simulate by varying envelope mass, disk radius and mass, and outflow cavity shape. Our aim is to determine how variations in physical properties of young stellar objects (e.g., mass infall rate, disk size) affect their obs…
The BH mass of nearby QSOs: a comparison of the bulge luminosity and virial methods
Falomo, R.; Uslenghi, M.; Treves, A. +1 more
We report on the analysis of the photometric and spectroscopic properties of a sample of 29 low-redshift (z < 0.6) QSOs for which both Hubble Space Telescope (HST) WFPC2 images and ultraviolet HST FOS spectra are available. For each object we measure the R-band absolute magnitude of the host galaxy, the CIV(1550Å) linewidth and the 1350Å contin…
The Morphological Demographics of Galaxies in the Advanced Camera for Surveys Hubble Ultra Deep Parallel Fields
Infante, Leopoldo; Benítez, Narciso; Blakeslee, John P. +4 more
We present a morphological analysis of distant field galaxies using the deep Advanced Camera for Surveys images from the public parallel Near-Infrared Camera and Multi-Object Spectrometer observations of the Hubble Ultra Deep Field obtained in the F435W (B435), F606W (V606), F775W (i775), and F850LP (z850
Large-Scale Activities Associated with the 2003 October 29 X10 Flare
Liu, Chang; Wang, Haimin; Deng, Na +2 more
We present a multiwavelength study focusing on the large-scale activities associated with the 2003 October 29 X10 flare and a halo CME. This event was strong enough to clearly show several large-scale activities, such as remote brightenings, Moreton waves at Hα off-bands, and type II radio bursts, which offers an excellent opportunity to clarify t…
Multiwavelength Star Formation Indicators: Observations
Giavalisco, M.; Leitherer, C.; Armus, L. +5 more
We present a compilation of multiwavelength data on different star formation indicators for a sample of nearby star forming galaxies. Here we discuss the observations, reductions and measurements of ultraviolet images obtained with STIS on board the Hubble Space Telescope (HST), ground-based Hα, and VLA 8.46 GHz radio images. These observations ar…
The Flux-Rope Scaling of the Acceleration of Coronal Mass Ejections and Eruptive Prominences
Schuck, P. W.; Chen, J.; Vourlidas, A. +2 more
The new flux-rope scaling law of the acceleration of coronal mass ejections (CMEs) derived by Chen & Krall is quantitatively tested by comparing the theoretical prediction with the near-Sun acceleration profiles of 13 eruptive prominences (EPs) and four CMEs. A CME and associated EP are assumed to be organized by an underlying magnetic flux ro…
Titan's surface albedo variations over a Titan season from near-infrared CFHT/FTS spectra
Lellouch, E.; Rannou, P.; Coustenis, A. +5 more
We have observed Titan in a series of campaigns from 1991 to 1996 with the Fourier Transform Spectrometer on the CFH telescope. The data acquired provide a lightcurve from the geometric albedos in the 0.9- 2.5µm spectral region. The 1991-1993 data were previously analyzed in Coustenis et al. [1995. Titan's surface: composition and variabilit…
Global fitting of globular cluster age indicators
Weiss, A.; Meissner, F.
Context: .Stellar models and the methods for the age determinations of globular clusters are still in need of improvement.
Aims: .We attempt to obtain a more objective method of age determination based on cluster diagrams, avoiding the introduction of biases due to the preference of one single age indicator.
Methods: .We compute new stella…
The Dwarf Novae during Quiescence
Sion, Edward M.; Urban, Joel A.
We present a synthetic spectral analysis of nearly the entire far-ultraviolet (FUV) IUE archive of spectra of dwarf novae (DNe) in or near their quiescence. We have examined all of the systems for which the signal-to-noise ratio permitted an analysis. The study includes 53 systems of all DN subtypes both above and below the period gap. The spectra…
Could electron-positron annihilation lines in the Galactic center result from pulsar winds?
Wang, W.; Pun, C. S. J.; Cheng, K. S.
Observations of a strong and extended positron-electron annihilation line emission in the Galactic center (GC) region by the Spectrometer on the International Gamma-Ray Astrophysical Laboratory (SPI/INTEGRAL) are challenging to the existing models of positron sources in the Galaxy. In this paper, we study the possibility that pulsar winds in the G…