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Long-lived triaxiality in the dynamically old elliptical galaxy NGC 4365: a limit on chaos and black hole mass
Bacon, Roland; Emsellem, Eric; Peletier, Reynier F. +1 more
Supermassive black holes in the centres of giant elliptical galaxies are thought to be capable of inducing chaos and eliminating or preventing triaxiality in their hosts if they are sufficiently massive. We address whether this process operates in real systems, by modelling the stellar kinematics of the old elliptical NGC 4365. This galaxy has a m…
Chandra and XMM-Newton observations of NGC 4214: the hot interstellar medium and the luminosity function of dwarf starbursts
Heckman, Timothy M.; Stevens, Ian R.; Hartwell, Joanna M. +2 more
We present results from Chandra and XMM-Newton X-ray observations of NGC 4214, a nearby dwarf starburst galaxy containing several young regions of very active star-formation. Starburst regions are known to be associated with diffuse X-ray emission, and in this case the X-ray emission from the galaxy shows an interesting morphological structure wit…
The properties of Lyman break galaxies at z~ 5
Hardcastle, M. J.; Bremer, M. N.; Lehnert, M. D. +3 more
In a recent paper, Lehnert & Bremer have photometrically selected a sample of Lyman break galaxies at z > 4.8 from a single VLT/FORS2 pointing and spectroscopically confirmed half of them to be at 4.8 < z < 5.8. To study the properties of such galaxies further, we have photometrically selected a similar sample (VAB > 28,…
Carina's defiant Finger: HST observations of a photoevaporating globule in NGC 3372*
Walborn, Nolan R.; Smith, Nathan; Barbá, Rodolfo H.
We present Hubble Space Telescope Wide Field Planetary Camera 2 images of a prominent externally ionized molecular globule in the Carina Nebula (NGC 3372), supplemented with ground-based infrared images and visual-wavelength spectra. This molecular globule has a shape resembling a human hand, with an extended finger that points toward its likely s…
XMM-Newton observations of three short-period polars: V347 Pav, GG Leo and EU UMa
Cropper, Mark; Ramsay, Gavin; Priedhorsky, W. +2 more
We present phase-resolved XMM-Newton data of three short-period polars: V347 Pav, GG Leo and EU UMa. All three systems show one dominant accretion region, which is seen for approximately half the orbital cycle. GG Leo shows a strong dip feature in its X-ray and ultraviolet (UV) light curves, which is due to absorption of X-rays from the accretion …
XMM-Newton observations of three high-redshift radio galaxies
Lawrence, C. R.; Hardcastle, M. J.; Birkinshaw, M. +2 more
We present the results of XMM-Newton observations of three powerful high-redshift radio galaxies 3C184, 3C292 and 3C322. Although none of the sources lies in as rich an X-ray-emitting environment as is seen for some powerful radio galaxies at low redshift, the environments provide sufficient pressure to confine the radio lobes. The weak gas emissi…
Timing analysis of the isolated neutron star RX J0720.4-3125 revisited
Cropper, Mark; Zavlin, Vyacheslav E.; Haberl, Frank +1 more
We present a reanalysis of the X-ray data for RX J0720.4-3125 presented in our previous paper, Zane et al., using more data recently available from XMM-Newton and Chandra. This analysis also corrects the ROSAT data used in that paper to the barycentric dynamical time (TDB) system, incorporates the revised XMM-Newton barycentric correction availabl…
XMM-Newton EPIC and Optical Monitor observations of Her X-1 over the 35-d beat period
Hailey, Charles J.; Ramsay, Gavin; Zane, Silvia +2 more
We present the results of a series of XMM-Newton European Photon Imaging Camera (EPIC) and Optical Monitor observations of Her X-1, spread over a wide range of the 35-d precession period. We confirm that the spin modulation of the neutron star is weak or absent in the low state - in marked contrast to the main or short-on states. During the states…
Iron line spectroscopy of NGC 4593 with XMM-Newton: where is the black hole accretion disc?
Kaiser, Mary Elizabeth; Brenneman, Laura W.; Wilms, Jörn +1 more
We present an analysis of the 2-10 keV XMM-Newton/EPIC-pn spectrum of the Seyfert-1 galaxy NGC 4593. Apart from the presence of two narrow emission lines corresponding to the Kα lines of cold and hydrogen-like iron, this spectrum possesses a power-law form to within ~3-5 per cent. There is a marked lack of spectral features from the relativistic r…
XMM-Newton confirmation of a warm absorber in the z= 4.4 blazar PMN J0525-3343
Iwasawa, K.; Fabian, A. C.; Celotti, A. +2 more
We present the analysis and results from a series of XMM-Newton observations of the distant blazar PMN J0525-3343 at a redshift of 4.4. The X-ray spectrum shows a spectral flattening below ~1 keV, confirming earlier results from ASCA and BeppoSAX. The spectrum is well fitted by a power-law continuum with either a spectral break or absorption; no s…