Search Publications
Supermassive black hole mass functions at intermediate redshifts from spheroid and AGN luminosity functions
Ueda, Yoshihiro; Tamura, Naoyuki; Ohta, Kouji
Redshift evolution of supermassive black hole mass functions (BHMFs) is investigated up to z~ 1. BHMFs at intermediate redshifts are calculated in two ways. One way is from early-type galaxy luminosity functions (LFs); we assume an MBH-Lsph correlation at a redshift by considering a passive evolution of Lsph in the…
Variability and multiperiodic oscillations in the X-ray light curve of the classical nova V4743 Sgr
Ness, J. -U.; Orio, M.; Gonzalez-Riestra, R. +5 more
The classical nova V4743 Sgr was observed with XMM-Newton for about 10h on 2003 April 4, 6.5 months after optical maximum. At this time, this nova had become the brightest supersoft X-ray source ever observed. In this paper, we present the results of a time-series analysis performed on the X-ray light curve (LC) obtained in this observation, and i…
The association between gas and galaxies - I. CFHT spectroscopy and pair analysis
Morris, Simon L.; Jannuzi, Buell T.
We investigate the relative distribution of the gaseous contents of the Universe (as traced by a sample of Lyα absorbers), and the luminous baryonic matter (as traced by a redshift survey of galaxies in the same volume searched for Lyα absorbers), along 16 lines of sight (LOS) between redshifts 0 and 1. Our galaxy redshift survey was made with the…
The X-ray properties of optically selected z > 0.6 clusters in the European Southern Observatory Distant Cluster Survey
Pelló, R.; Milvang-Jensen, B.; Halliday, C. +11 more
We present XMM-Newton observations of three optically selected z > 0.6 clusters from the European Southern Observatory (ESO) Distant Cluster Survey (EDisCS), comprising the first results of a planned X-ray survey of the full EDisCS high-redshift sample. The EDisCS clusters were identified in the Las Campanas Distant Cluster Survey as surface br…
XMM-Newton observations of the complex spin pulse of the intermediate polar PQ Geminorum
Hellier, Coel; Ramsay, Gavin; Evans, P. A.
The intermediate polar PQ Geminorum shows a complex pulsation, caused by a spinning white dwarf, which varies markedly with wavelength. We report XMM-Newton observations, including the soft and hard X-ray bands and the first ultraviolet light curves of this star. We update the ephemeris for PQ Gem allowing us to align these data with a compilation…
Have we detected the most luminous ULX so far?
Cappi, M.; Ponti, G.; Fabian, A. C. +4 more
We report the XMM-Newton detection of a moderately bright X-ray source (F0.5-7 ~ 8.2 × 10-14ergcm-2s-1) superimposed on the outer arms of the inactive spiral galaxy MCG-03-34-63 (z = 0.0213). It is clearly offset from the nucleus (by about 19 arcsec) but well within the D25 ellipse of the gala…
NGC 7419: a young open cluster with a number of very young intermediate mass pre-MS stars
Mathew, Blesson; Subramaniam, Annapurni; Ramya, S. +1 more
We present a photometric and spectroscopic study of the young open cluster NGC 7419, which is known to host a large number of classical Be stars for reasons not well understood. Based on CCD photometric observations of 327 stars in UBV passbands, we estimated the cluster parameters as, reddening [E(B - V)] = 1.65 +/- 0.15 mag and distance = 2900 +…
INTEGRAL observations of active galactic nuclei obscured by the Galactic plane
de Rosa, A.; Hill, A. B.; Walter, R. +9 more
In this paper, we present INTEGRAL observations of seven active galactic nuclei (AGNs): two newly discovered type 1 Seyferts, IGR J18027-1455 and J21247+5058 and five well-known Seyferts, NGC 6814 (type 1.5), Cygnus A (type 2), MCG-05-23-16 (type 2), ESO 103-G035 (type 2) and GRS 1734-292. For IGR J18027-1455 and J21247+5058, only INTEGRAL/IBIS da…
[TiII] and [NiII] emission from the strontium filament of η Carinae
Gull, T. R.; Smith, N.; Bautista, M. A. +2 more
We study the nature of the [TiII] and [NiII] emission from the so-called strontium filament found in the ejecta of η Carinae. To this purpose, we employ multilevel models of the TiII and NiII systems, which are used to investigate the physical condition of the filament and the excitation mechanisms of the observed lines. For the TiII ion, for whic…
Mining for normal galaxies in the first XMM-Newton Serendipitous Source Catalog
Georgantopoulos, I.; Chavushyan, V.; Plionis, M. +4 more
This paper uses the first XMM-Newton Serendipitous Source Catalog compiled by the XMM-Newton Science Centre to identify low-z X-ray selected normal galaxy candidates. Our sample covers a total area of ~6deg2 to the 0.5-2keV limit ~10-15ergs-1cm-2. A total of 23 sources are selected on the basis of low X-…