Search Publications
Missions
Journals
Publication Years
The First Maximum-light Ultraviolet through Near-infrared Spectrum of a Type Ia Supernova
Filippenko, Alexei V.; Foley, Ryan J.; Kirshner, Robert P. +21 more
We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space Telescope at UV/optical wavelengths and the Magellan Baade telescope at NIR wavelengths. These data provide the opportunity to examine the entire maxim…
Precursor of Sunspot Penumbral Formation Discovered with Hinode Solar Optical Telescope Observations
Shimizu, Toshifumi; Ichimoto, Kiyoshi; Suematsu, Yoshinori
We present observations of a precursory signature that would be helpful for understanding the formation process of sunspot penumbrae. The Hinode Solar Optical Telescope successfully captured the entire evolution of a sunspot from the pore to a large well-developed sunspot with penumbra in an emerging flux region appearing in NOAA Active Region 110…
AGN-host galaxy connection: morphology and colours of X-ray selected AGN at z ≤ 2
Castañeda, H.; Cepa, J.; Bongiovanni, A. +11 more
Context. The connection between active galactic nuclei (AGN) and their host galaxies has been widely studied and found to be of great importance for providing answers to some fundamental questions related to AGN fuelling mechanisms, and both their formation and evolution.
Aims: Using X-ray data and one of the deepest broad-band optical data s…
Measuring the Solar Radius from Space during the 2003 and 2006 Mercury Transits
Kuhn, J. R.; Bush, R. I.; Emilio, M. +1 more
The Michelson Doppler Imager (MDI) aboard the Solar and Heliospheric Observatory observed the transits of Mercury on 2003 May 7 and 2006 November 8. Contact times between Mercury and the solar limb have been used since the seventeenth century to derive the Sun's size but this is the first time that high-quality imagery from space, above the Earth'…
Three-dimensional interferometric, spectrometric, and planetary views of Procyon
Matter, A.; Lopez, B.; Kervella, P. +5 more
Context. Procyon is one of the brightest stars in the sky and one of our nearest neighbours. It is therefore an ideal benchmark object for stellar astrophysics studies using interferometric, spectroscopic, and asteroseismic techniques.
Aims: We use a new realistic three-dimensional (3D) radiative-hydrodynamical (RHD) model atmosphere of Procy…
A Giant Metrewave Radio Telescope/Chandra view of IRAS 09104+4109: a type 2 QSO in a cooling flow
Donahue, Megan; Hoekstra, Henk; Babul, Arif +8 more
IRAS 09104+4109 is a rare example of a dust enshrouded type 2 quasi-stellar object (QSO) in the centre of a cool-core galaxy cluster. Previous observations of this z = 0.44 system showed that, as well as powering the hyperluminous infrared emission of the cluster-central galaxy, the QSO is associated with a double-lobed radio source. However, the …
Herschel/PACS observations of young sources in Taurus: the far-infrared counterpart of optical jets
Pinte, C.; Dent, W. R. F.; Kamp, I. +8 more
Context. Observations of the atomic and molecular line emission associated with jets and outflows emitted by young stellar objects provide sensitive diagnostics of the excitation conditions, and can be used to trace the various evolutionary stages they pass through as they evolve to become main sequence stars.
Aims: To understand the relevanc…
Further X-ray observations of the galaxy cluster PKS 0745-191 to the virial radius and beyond
Fabian, A. C.; Sanders, J. S.; Walker, S. A. +1 more
We use new Suzaku observations of PKS 0745-191 to measure the thermodynamic properties of its intracluster medium (ICM) out to and beyond r200 (reaching 1.25r200) with better accuracy than previously achieved, owing to a more accurate and better understood background model. We investigate and resolve the tensions between the …
The Location of Solar Metric Type II Radio Bursts with Respect to the Associated Coronal Mass Ejections
Ramesh, R.; Kathiravan, C.; Gopalswamy, N. +2 more
Forty-one solar type II radio bursts located close to the solar limb (projected radial distance r >~ 0.8 R ⊙) were observed at 109 MHz by the radioheliograph at the Gauribidanur observatory near Bangalore during the period 1997-2007. The positions of the bursts were compared with the estimated location of the leading edge (LE) of the…
Photometric determination of the mass accretion rates of pre-mainsequence stars - III. Results in the Large Magellanic Cloud
Panagia, N.; De Marchi, G.; Sicilia-Aguilar, A. +2 more
We present a multi-wavelength study of three star forming regions, spanning the age range 1-14 Myr, located between the 30 Doradus complex and supernova SN1987A in the Large Magellanic Cloud (LMC). We reliably identify about 1000 pre-main sequence (PMS) star candidates actively undergoing mass accretion and estimate their stellar properties and ma…