Search Publications
The Supermassive Black Hole in M84 Revisited
Barth, Aaron J.; Sarzi, Marc; Walsh, Jonelle L.
The mass of the central black hole in the giant elliptical galaxy M84 has previously been measured by two groups using the same observations of emission-line gas with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, giving strongly discrepant results: Bower et al. found M BH = (1.5+1.1 -0.6<…
Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822
Elbaz, D.; Pérez-Fournon, I.; Bock, J. J. +57 more
We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 µm and clearly resolve the H ii regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 µm surface brightness in NGC 6822, which would locally link the heating processes of the coldest phases of …
Analysis of phyllosilicate deposits in the Nili Fossae region of Mars: Comparison of TES and OMEGA data
Mangold, Nicolas; Bibring, Jean-Pierre; Poulet, François +1 more
Diverse phyllosilicate deposits discovered previously in the Nili Fossae region with near infrared reflectance data are a window into the complex history of aqueous alteration on Mars. In this work, we used thermal infrared data from the Thermal Emission Spectrometer (TES) in combination with near infrared data from the Observatoire pour la Minéra…
Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region
de Graauw, Th.; Liseau, R.; Braine, J. +60 more
Herschel/HIFI observations of high-J lines (up to Ju = 10) of 12CO, 13CO and C18O are presented toward three deeply embedded low-mass protostars, NGC 1333 IRAS 2A, IRAS 4A, and IRAS 4B, obtained as part of the Water In Star-forming regions with Herschel (WISH) key program. The spectrally-resolved HIFI da…
Numerical simulation of the 12 May 1997 CME Event: The role of magnetic reconnection
Owens, M. J.; Crooker, N. U.; Gombosi, T. I. +4 more
We perform a numerical study of the evolution of a Coronal Mass Ejection (CME) and its interaction with the coronal magnetic field based on the 12 May 1997, CME event using a global MagnetoHydroDynamic (MHD) model for the solar corona. The ambient solar wind steady-state solution is driven by photospheric magnetic field data, while the solar erupt…
VLT-MAD observations of the core of 30 Doradus
Bastian, N.; Alves, J.; Mackey, A. D. +5 more
We present H- and Ks-band imaging of three fields at the centre of 30 Doradus (30 Dor) in the Large Magellanic Cloud, obtained as part of the Science Demonstration programme with the Multiconjugate Adaptive optics Demonstrator (MAD) at the Very Large Telescope. Strehl ratios of 15-30 per cent were achieved in the Ks band, yie…
The kinematics and chemical stratification of the type Ia supernova remnant 0519-69.0. An XMM-Newton and Chandra study
Vink, J.; Kosenko, D.; Helder, E. A.
We present a detailed analysis of the XMM-Newton and Chandra X-ray data of the young type Ia supernova remnant SNR 0519-69.0, which is situated in the Large Magellanic Cloud. We used data from both the Chandra ACIS and XMM-Newton EPIC MOS instruments, and high resolution X-ray spectra obtained with the XMM-Newton reflection grating spectrometer (R…
Herschel photometry of brightest cluster galaxies in cooling flow clusters
Böhringer, H.; Popesso, P.; Jaffe, W. +24 more
The dust destruction timescales in the cores of clusters of galaxies are relatively short given their high central gas densities. However, substantial mid-infrared and sub-mm emission has been detected in many brightest cluster galaxies. In this letter we present Herschel PACS and SPIRE photometry of the brightest cluster galaxy in three strong co…
Hubble Space Telescope WFC3 Grism Spectroscopy and Imaging of a Growing Compact Galaxy at z = 1.9
van Dokkum, Pieter G.; Brammer, Gabriel
We present HST/WFC3 grism near-IR spectroscopy of the brightest galaxy at z > 1.5 in the GOODS-South WFC3 ERS grism pointing. The spectrum is of remarkable quality and shows the redshifted Balmer lines Hβ, Hγ, and Hδ in absorption at z = 1.902 ± 0.002. The absorption lines can be produced by a post-starburst stellar population with a luminosity…
The Einstein Cross: Constraint on Dark Matter from Stellar Dynamics and Gravitational Lensing
Miller, Bryan W.; van de Ven, Glenn; Cappellari, Michele +3 more
We present two-dimensional line-of-sight stellar kinematics of the lens galaxy in the Einstein Cross, obtained with the GEMINI 8 m telescope, using the GMOS integral-field spectrograph. The stellar kinematics extend to a radius of 4'' (with 0farcs2 spaxels), covering about two-thirds of the effective (or half-light) radius Re ~= 6'' of …