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The very low mass multiple system LHS 1070. A testbed for model atmospheres for the lower end of the main sequence
Schultheis, M.; Ryde, N.; Leinert, Ch. +8 more
Context. LHS 1070 is a nearby multiple system of low mass stars. It is an important source of information for probing the low mass end of the main sequence, down to the hydrogen-burning limit. The primary of the system is a mid-M dwarf and two components are late-M to early L dwarfs, at the star-brown dwarf transition. Hence LHS 1070 is a valuable…
Searching for massive outflows in Holmberg IX X-1 and NGC 1313 X-1: the iron K band
Fabian, A. C.; Miller, J. M.; Reis, R. C. +1 more
We have analysed all the good quality XMM-Newton data publicly available for the bright ultraluminous X-ray sources Holmberg IX X-1 and NGC 1313 X-1, with the aim of searching for discrete emission or absorption features in the Fe K band that could provide observational evidence for the massive outflows predicted if these sources are accreting at …
Calibrating the projection factor for Galactic Cepheids
Marengo, M.; Nardetto, N.; Ngeow, C. -C. +1 more
Context. The projection factor (p), which converts the radial velocity to pulsational velocity, is an important parameter in the Baade-Wesselink (BW) type analysis and distance scale work. The p-factor is either adopted as a constant or linearly depending on the logarithmic of pulsating periods.
Aims: The aim of this work is to calibrate the …
The Quiescent X-Ray Properties of the Accreting Millisecond X-Ray Pulsar and Eclipsing binary Swift J1749.4-2807
Degenaar, N.; Wijnands, R.; Patruno, A.
Swift J1749.4-2807 is a transient neutron star low-mass X-ray binary that contains an accreting millisecond X-ray pulsar spinning at 518 Hz. It is the first of its kind that displays X-ray eclipses, which holds significant promise to precisely constrain the mass of the neutron star. We report on a ~= 105 ks long XMM-Newton observation performed wh…
A Flux-limited Sample of z ~ 1 Lyα Emitting Galaxies in the Chandra Deep Field South
Barger, A. J.; Cowie, L. L.; Wold, I. G. B.
We describe a method for obtaining a flux-limited sample of Lyα emitters from Galaxy Evolution Explorer (GALEX) grism data. We show that the multiple GALEX grism images can be converted into a three-dimensional (two spatial axes and one wavelength axis) data cube. The wavelength slices may then be treated as narrowband images and searched for emis…
XMM-Newton observations of four high mass X-ray binaries and IGR J17348-2045
Campana, S.; Stella, L.; Paltani, S. +5 more
We present the results of the XMM-Newton observations of five hard X-ray emitters: IGR J08262-3736, IGR J17354-3255, IGR J16328-4726, SAX J1818.6-1703, and IGR J17348-2045. The first source is a confirmed supergiant high mass X-ray binary, the following two are candidates supergiant fast X-ray transients, SAX J1818.6-1703 is a confirmed supergiant…
Exploring the Relation between (Sub-)Millimeter Radiation and γ-Ray Emission in Blazars with Planck and Fermi
Lähteenmäki, A.; Polenta, G.; Gasparrini, D. +5 more
The coexistence of Planck and Fermi satellites in orbit has enabled the exploration of the connection between the (sub-)millimeter and γ-ray emission in a large sample of blazars. We find that the γ-ray emission and the (sub-)mm luminosities are correlated over five orders of magnitude, L γvpropL (sub-)mm. However, this corre…
The ancient stellar population of M 32: RR Lyrae variable stars confirmed
Saha, A.; Clementini, G.; Contreras Ramos, R. +2 more
Using archival multi-epoch ACS/WFC images in the F606W and F814W filters of a resolved stellar field in Local Group dwarf elliptical galaxy M 32 we have made an accurate colour-magnitude diagram and a careful search for RR Lyr variable stars. We identified 416 bona fide RR Lyr stars over our field of view, and their spatial distribution shows a ri…
Comoving Space Density and Obscured Fraction of High-redshift Active Galactic Nuclei in the Subaru/XMM-Newton Deep Survey
Ueda, Yoshihiro; Akiyama, Masayuki; Hiroi, Kazuo +1 more
We study the comoving space density of X-ray-selected luminous active galactic nuclei (AGNs) and the obscured AGN fraction at high redshifts (3 < z < 5) in the Subaru/XMM-Newton Deep Survey field. From an X-ray source catalog with high completeness of optical identification thanks to deep optical images, we select a sample of 30 AGNs at z &g…
The horizontal branch luminosity vs. metallicity in M 31 globular clusters
Cacciari, C.; Bellazzini, M.; Galleti, S. +3 more
Context. Thanks to the outstanding capabilites of the HST, our current knowledge about the M 31 globular clusters (GCs) is similar to our knowledge of the Milky Way GCs in the 1960s - 1970s, which set the basis for studying the halo and galaxy formation using these objects as tracers, and established their importance in defining the cosmic distanc…