Search Publications
XMM-Newton observation of the Lockman Hole. I. The X-ray data
Finoguenov, A.; Altieri, B.; Arnaud, M. +25 more
We report on the first deep X-ray survey with the XMM-Newton observatory during the performance verification phase. The field of the Lockman Hole, one of the best studied sky areas over a very wide range of wavelengths, has been observed. A total of ~ 100 ksec good exposure time has been accumulated. Combining the images of the European Photon Ima…
Far-Infrared Spectroscopy of Normal Galaxies: Physical Conditions in the Interstellar Medium
Helou, G.; Contursi, A.; Stacey, G. +10 more
The most important cooling lines of the neutral interstellar medium (ISM) lie in the far-infrared (FIR). We present measurements by the Infrared Space Observatory Long Wavelength Spectrometer of seven lines from neutral and ionized ISM of 60 normal, star-forming galaxies. The galaxy sample spans a range in properties such as morphology, FIR colors…
Quasi-Stellar Objects, Ultraluminous Infrared Galaxies, and Mergers
Stockton, Alan; Canalizo, Gabriela
We test the hypothesis that QSOs are formed via strong tidal interactions or mergers, initially going through an ultraluminous infrared phase. Our approach is to look for traces of this phase in the host galaxies of QSOs. We select a sample of low-redshift bona fide QSOs that may be in a transitionary stage between ultraluminous infrared galaxies …
X-ray spectroscopy of the cluster of galaxies Abell 1795 with XMM-Newton
Kaastra, J. S.; Fabian, A. C.; Mushotzky, R. F. +8 more
The initial results from XMM-Newton observations of the rich cluster of galaxies
XMM-EPIC observation of MCG-6-30-15: direct evidence for the extraction of energy from a spinning black hole?
Staubert, Rüdiger; Wilms, Jörn; Reynolds, Christopher S. +4 more
We present XMM-Newton European Photon Imaging Camera (EPIC) observations of the bright Seyfert 1 galaxy MCG-6-30-15, focusing on the broad Fe Kα line at ~6keV and the associated reflection continuum, which is believed to originate from the inner accretion disc. We find these reflection features to be extremely broad and redshifted, indicating an o…
On the Nature of the Central Source in η Carinae
Davidson, K.; Hillier, D. John; Gull, T. +1 more
Long-slit spectroscopic observations of η Carinae and its Homunculus have recently been obtained using STIS on the Hubble Space Telescope (HST). We have extracted the spectrum of the central source using a 0.1"×0.13" aperture. As expected, the spectrum is very different from ground-based spectra obtained under normal seeing conditions (i.e., 1")-t…
A Correlation between Galaxy Light Concentration and Supermassive Black Hole Mass
Graham, Alister W.; Trujillo, I.; Erwin, Peter +1 more
We present evidence for a strong correlation between the concentration of bulges and the mass of their central supermassive black hole (Mbh)-more concentrated bulges have more massive black holes. Using Cre(1/3) from Trujillo, Graham, & Caon as a measure of bulge concentration, we find that log(Mbh/M…
All-sky compiled catalogue of 2.5 million stars
Kharchenko, N. V.
The all-sky Compiled Catalogue of more than 2.5 million stars with the limiting magnitude V ≈14(m) was created as a result of combining of star lists from present-day large high-precision catalogues of space (HIPPARCOS Tycho family catalogues) and ground-based (PPM, CMC11) observations and reducing them to the standard systems of corresponding ste…
The CH out-of-plane bending modes of PAH molecules in astrophysical environments
Hony, S.; Tielens, A. G. G. M.; Allamandola, L. J. +3 more
We present 10-15 mu m spectra of a sample of H ii regions, YSOs and evolved stars that show strong unidentified infrared emission features, obtained with the ISO/SWS spectrograph on-board ISO. These spectra reveal a plethora of emission features with bands at 11.0, 11.2, 12.0, 12.7, 13.5 and 14.2 mu m. These features are observed to vary considera…
New Insights from HST Studies of Globular Cluster Systems. I. Colors, Distances, and Specific Frequencies of 28 Elliptical Galaxies
Kundu, Arunav; Whitmore, Bradley C.
We present an analysis of the globular cluster systems of 28 elliptical galaxies using archival WFPC2 images in the V and I bands. The V-I color distributions of at least 50% of the galaxies appear to be bimodal at the present level of photometric accuracy. We argue that this is indicative of multiple epochs of cluster formation early in the histo…