Search Publications
The morphological transformation of red sequence galaxies in the distant cluster XMMU J1229+0151
Demarco, R.; Lidman, C.; Huertas-Company, M. +5 more
We present the results of a detailed analysis of galaxy properties along the red sequence in XMMU J1229+0151, an X-ray selected cluster at z = 0.98 drawn from the High Acuity Wide field K-band Imager Cluster Survey. Taking advantage of the broad photometric coverage and the availability of 77 spectra in the cluster field, we fit synthetic spectral…
Unraveling the Mysteries of the Leo Ring: An Absorption Line Study of an Unusual Gas Cloud
Keeney, B. A.; Rosenberg, J. L.; Giroux, M. L. +2 more
Since the discovery of the large (2 × 109 M ⊙) intergalactic cloud known as the Leo Ring in the 1980s, the origin of this object has been the center of a lively debate. Determining the origin of this object is still important as we develop a deeper understanding of the accretion and feedback processes that shape galaxy evolut…
Probing the Gaseous Disk of T Tau N with CN 5-4 Lines
Woitke, P.; Kamp, I.; White, G. J. +12 more
We present spectrally resolved observations of the young multiple system T Tau in atomic and molecular lines obtained with the Heterodyne Instrument for the Far Infrared on board Herschel. While CO, H2O, [C II], and SO lines trace the envelope and the outflowing gas up to velocities of 33 km s-1 with respect to systemic, the …
Constraining UV Continuum Slopes of Active Galactic Nuclei with CLOUDY Models of Broad-line Region Extreme-ultraviolet Emission Lines
Shull, J. Michael; Moloney, Joshua
Understanding the composition and structure of the broad-line region (BLR) of active galactic nuclei (AGNs) is important for answering many outstanding questions in supermassive black hole evolution, galaxy evolution, and ionization of the intergalactic medium. We used single-epoch UV spectra from the Cosmic Origins Spectrograph (COS) on the Hubbl…
Temporal variations and spectral properties of the Be/X-ray pulsar GRO J1008—57 studied by INTEGRAL
Wang, Wei
The spin period variations and hard X-ray spectral properties of the Be/X-ray pulsar GRO J1008—57 are studied with INTEGRAL observations during two outbursts in 2004 June and 2009 March. The pulsation periods of ~ 93.66 s in 2004 and ~ 93.73 s in 2009 are determined. Pulse profiles of GRO J1008—57 during outbursts are strongly energy dependent wit…
Red giant branch bump star counts in data and stellar models
Nataf, David M.
We compare model predictions to observations of star counts in the red giant branch bump (RGBB) relative to the number density of first-ascent red giant branch at the magnitude of the RGBB, EWRGBB. The predictions are shown to exceed the data by (5.2 ± 4.3) per cent for the BaSTI models and by (17.1 ± 4.3) per cent for the Dartmouth mod…
Stellar physical parameters from Strömgren photometry. Application to the young stars in the Galactic anticenter survey
Monguió, M.; Figueras, F.; Grosbøl, P.
Aims: The aim is to derive accurate stellar distances and extinctions for young stars of our survey in the Galactic anticenter direction using the Strömgren photometric system. This will allow a detailed mapping of the stellar density and absorption toward the Perseus arm.
Methods: We developed a new method for deriving physical paramete…
X-Ray Observations of Powerful AGN Outflows. Implications for Feedback
Pounds, Ken
Highly ionised winds with velocities ∼0.1-0.2 c were first detected in X-ray spectra of non-BAL AGN a decade ago. Subsequent observations and archival searches have shown such winds to be a common feature of luminous AGN, increasing the belief that powerful ionised winds have a wider importance in galaxy feedback models. Paradoxically, for the bes…
Dust temperature maps of the Galactic plane: The Herschel spectral energy distribution fitting with Cloudy predictions
Huang, Maohai; Zhu, Jiali
Context. Dust grains absorb the interstellar far ultra-violet and visible photons and re-emit them in far-infrared (FIR) wavebands. The dust FIR continuum can be predicted by a grid of models using various values of the interstellar radiation field.
Aims: We analyze the dust continuum emission in two Hi-GAL science-demonstration phase (SDP) f…
Mars Express radio-occultation data: A novel analysis approach
Witasse, O.; Blelly, P. -L.; Grandin, M. +1 more
The Mars Express Radio Science (MaRS) experiment on board Mars Express has been providing radio-occultation data since early 2004. The analysis method currently used to retrieve neutral atmosphere and ionosphere profiles is based on the resolution of a complex inverse problem. The solution to such a problem is obtained under strong assumptions on …