Search Publications
High-resolution spectra of the planetary nebula NGC 6803
Hyung, S.; Lee, S. -J.
We present the high-dispersion spectra of the elliptical ring shaped planetary nebula NGC 6803, secured with the Hamilton Echelle Spectrograph attached to the 3-m Shane telescope of Lick Observatory. Numerous lines from neutral to quadruply ionized ions are presented in the wavelength region from 3650 to 9900 Å. We also use the low dispersion UV s…
Polarization of Saturn's moon Iapetus. III. Models of the bright and the dark sides
Muinonen, K.; Tozzi, G. P.; Boehnhardt, H. +4 more
Context. Like many other atmosphereless solar system bodies, Iapetus exhibits a phenomenon of negative polarization at small phase angles, which can be modeled using theoretical approaches that consider interaction of light with a complex medium.
Aims: To retrieve information on the nature of Iapetus' surface material, we carried out theoreti…
Distant galaxy clusters in a deep XMM-Newton field within the CFTHLS D4
Böhringer, H.; Rosati, P.; Takey, A. +15 more
Aims: The XMM-Newton distant cluster project (XDCP) aims at the identification of a well defined sample of X-ray selected clusters of galaxies at redshifts z ≥ 0.8. As part of this project, we analyse the deep XMM-Newton exposure covering one of the CFHTLS deep fields to quantify the cluster content. We validate the optical follow-up strategy…
AKARI view of star formation in NGC 1313
Onaka, T.; Kaneda, H.; Suzuki, T.
Context. In the southwest region of NGC 1313, patchy star-forming regions are found. In the neighborhood, is a giant supershell with a diameter of 3.2 kpc. However, the direct association between star-forming regions and the giant supershell is still unclear.
Aims: We investigate the relation between the surface densities of the gas (Σga…
INTEGRAL observations of Scorpius X-1: evidence for Comptonization up to 200 keV
Maiolino, T.; Braga, J.; D'Amico, F.
We have analyzed a long-term database for Sco X-1 obtained with the telescope IBIS onboard the INTEGRAL satellite in order to study the hard X-ray behavior of Sco X-1 from 20 up to 200 keV. Besides the data used for producing of the INTEGRAL catalog of sources, this is the longest (412 ks) database of IBIS on Sco X-1 up to date. The production of …
Narrow-line H i and cold structures in the interstellar medium
Haud, U.
Context. Studying the H i line profiles in the Leiden-Argentina-Bonn (LAB) all-sky database, we have found a population of very cold H i clouds. So far, the role of these clouds in the interstellar medium (ISM) has remained unclear.
Aims: In this paper, we attempt to confirm the existence of the narrow-line H i emission (NHIE) clouds by using…
A near-infrared variability campaign of TMR-1: New light on the nature of the candidate protoplanet TMR-1C
Martín, E. L.; Monin, J. -L.; Riaz, B. +1 more
We present a near-infrared (NIR) photometric variability study of the TMR-1 system, a Class I protobinary located in the Taurus molecular cloud. Our aim is to confirm NIR variability for the candidate protoplanet, TMR-1C, located at a separation of about 10″ (~1000 AU) from the protobinary. We conducted a photometric monitoring campaign between Oc…
3.3 µm PAH observations of the central kiloparsecs of Centaurus A
Sturm, E.; Tacconi-Garman, L. E.
Aims: The aim of this work is to further investigate the nature of polycyclic aromatic hydrocarbon (PAH) excitation and emission especially in the context of tracing star formation in a variety of extragalactic environments. Here we turn our attention to the energetic environment of the closest active galactic nucleus (AGN) in our sample, Cen…
Astrometric mock observations for determining the local dark matter density
Inoue, S.; Gouda, N.
Context. To determine the local dark matter density of the solar system is a classical problem in astronomy. Recently, a novel method of determining the local dark matter density from stellar distribution and vertical velocity dispersion profiles perpendicular to the Galactic plane was devised. This method has the advantage of abolishing conventio…
X-ray view of four high-luminosity Swift/BAT AGN: Unveiling obscuration and reflection with Suzaku
Malaguti, G.; Mushotzky, R. F.; Koss, M. +2 more
Aims: A complete census of obscured active galactic nuclei (AGN) is necessary to reveal the history of the super massive black hole (SMBH) growth and galaxy evolution in the Universe given the complex feedback processes and the fact that much of this growth occurs in an obscured phase. In this context, hard X-ray surveys and dedicated follow-…