Search Publications
Confirming the thermal Comptonization model for black hole X-ray emission in the low-hard state
Maiolino, T.; Wilms, J.; Pottschmidt, K. +3 more
Hard X-ray spectra of black hole binaries in the low/hard state are well modeled by thermal Comptonization of soft seed photons by a corona-type region with kT ~ 50 keV and optical depth around 1. Previous spectral studies of 1E 1740.7-2942, including both the soft and the hard X-ray bands, were always limited by gaps in the spectra or by a combin…
On the presence of ultrafast outflows in the WAX sample of Seyfert galaxies.
Cappi, M.; Tombesi, F.
The study of winds in active galactic nuclei (AGNs) is of utmost importance as they may provide the long sought-after link between the central black hole and the host galaxy, establishing the AGN feedback. Recently, Laha et al. reported the X-ray analysis of a sample of 26 Seyferts observed with XMM-Newton, which are part of the so-called warm abs…
Abundance Patterns in the Interstellar Medium of Early-type Galaxies Observed with Suzaku
Matsushita, Kyoko; Tamagawa, Toru; Nagino, Ryo +1 more
We have analyzed 17 early-type galaxies, 13 ellipticals and 4 S0 galaxies, observed with Suzaku, and investigated metal abundances (O, Mg, Si, and Fe) and abundance ratios (O/Fe, Mg/Fe, and Si/Fe) in the interstellar medium (ISM). The emission from each on-source region, which is four times the effective radius, r e, is reproduced with …
The HIFI spectral survey of AFGL 2591 (CHESS). II. Summary of the survey
Ceccarelli, C.; van der Tak, F. F. S.; Helmich, F. P. +3 more
Aims: This paper presents the richness of submillimeter spectral features in the high-mass star forming region AFGL 2591.
Methods: As part of the Chemical Herschel Survey of Star Forming Regions (CHESS) key programme, AFGL 2591 was observed by the Herschel (HIFI) instrument. The spectral survey covered a frequency range from 480 to 1240 …
Photon-dominated Region Modeling of the [C I], [C II], and CO Line Emission from a Boundary in the Taurus Molecular Cloud
Goldsmith, Paul F.; Pineda, Jorge L.; Orr, Matthew E.
We present [C I] and [C II] observations of a linear edge region in the Taurus molecular cloud, and model this region as a cylindrically symmetric photon-dominated region (PDR) exposed to a low-intensity UV radiation field. The sharp, long profile of the linear edge makes it an ideal case to test PDR models and determine cloud parameters. We compa…
Water Production in Comets C/2011 l4 (PanSTARRS) and C/2012 f6 (Lemmon) from observations with SOHO/SWAN
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +3 more
Comets C/2011 L4 (PanSTARRS) and C/2012 F6 (Lemmon) were observed throughout their 2012-2013 apparitions with the Solar Wind Anisotropies (SWAN) all-sky hydrogen Lyα camera on board the Solar and Heliosphere Observatory (SOHO) satellite. SOHO has been in a halo orbit around the L1 Earth-Sun Lagrange point since early 1996 and has been observing th…
The extended structure of the dwarf irregular galaxy Sagittarius
Bellazzini, M.; Galleti, S.; Testa, V. +6 more
We present a detailed study of the stellar and H i structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to ≃5.0' (corresponding to ≃1600 pc) and down to µV ≃ 30.0 mag/arcsec2, thus showing that the stellar body of the gal…
AKARI infrared camera observations of the 3.3 µm PAH feature in Swift/BAT AGNs
Nakagawa, Takao; Shirahata, Mai; Oyabu, Shinki +6 more
We explore the relationships between the 3.3 µm polycyclic aromatic hydrocarbon (PAH) feature and active galactic nucleus (AGN) properties of a sample of 54 hard X-ray selected bright AGNs, including both Seyfert 1 and Seyfert 2 type objects, using the InfraRed Camera (IRC) on board the infrared astronomical satellite AKARI. The sample is se…
Discovery of SXP 265, a Be/X-ray binary pulsar in the Wing of the Small Magellanic Cloud
Haberl, F.; Greiner, J.; Udalski, A. +5 more
We identify a new candidate for a Be/X-ray binary in the XMM-Newton slew survey and archival Swift observations that is located in the transition region of the Wing of the Small Magellanic Cloud and the Magellanic Bridge. We investigated and classified this source with follow-up XMM-Newton and optical observations. We model the X-ray spectra and s…
The Rest-frame Ultraviolet Structure of 0.5 < z < 1.5 Galaxies
Koekemoer, Anton M.; Ravindranath, Swara; Gardner, Jonathan P. +8 more
We present the rest-frame UV wavelength dependence of the Petrosian-like half-light radius (r 50), and the concentration parameter for a sample of 198 star-forming galaxies at 0.5 < z < 1.5. We find a ~5% decrease in r 50 from 1500 Å to 3000 Å, with half-light radii at 3000 Å ranging from 0.6 kpc to 6 kpc. We also find …