Search Publications
Identifying AGN Balmer absorptions and stratified narrow emission-line region kinematics in SDSS J112611.63+425246.4
Wang, J.; Xu, D. W.
Context. Balmer absorption is a rare phenomenon in active galactic nuclei (AGNs). So far, only seven Balmer-absorption AGNs have been reported in the literature.
Aims: We here report the identification of SDSS J112611.63+425246 as a new Balmer-absorption AGN through our spectral analysis and study the kinematics of its narrow emission-line re…
Estimation of inflation parameters for Perturbed Power Law model using recent CMB measurements
Das, Santanu; Souradeep, Tarun; Mukherjee, Suvodip +1 more
Cosmic Microwave Background (CMB) is an important probe for understanding the inflationary era of the Universe. We consider the Perturbed Power Law (PPL) model of inflation which is a soft deviation from Power Law (PL) inflationary model. This model captures the effect of higher order derivative of Hubble parameter during inflation, which in turn …
Binary Astrometric Microlensing with Gaia
Sajadian, Sedighe
We investigate whether or not Gaia can specify the binary fractions of massive stellar populations in the Galactic disk through astrometric microlensing. Furthermore, we study whether or not some information about their mass distributions can be inferred via this method. In this regard, we simulate the binary astrometric microlensing events due to…
Quantifying Dark Gas
Heiles, Carl; Li, Di; Xu, Duo +2 more
A growing body of evidence has been supporting the existence of so-called "dark molecular gas" (DMG), which is invisible in the most common tracer of molecular gas, i.e., CO rotational emission. DMG is believed to be the main gas component of the intermediate extinction region between A$\rm_v$$\sim$0.05-2, roughly corresponding to the self-shieldi…
Suzaku Observation of the Fermi Cygnus Cocoon: The Search for a Signature of Young Cosmic-Ray Electrons
Mizuno, T.; Takahashi, H.; Tibaldo, L. +4 more
The origin of Galactic cosmic rays remains unconfirmed, but promising candidates for their sources are found in star-forming regions. We report a series of X-ray observations, with Suzaku, toward the nearby star-forming region of Cygnus X. They aim at comparing diffuse X-ray emissions on and off the γ-ray cocoon of hard cosmic rays revealed by the…
Chromospheric Rapid Blueshifted Excursions Observed with IBIS and their Association with Photospheric Magnetic Field Evolution
Liu, Chang; Jing, Ju; Denker, Carsten +9 more
Chromospheric rapid blueshifted excursions (RBEs) are suggested to be the disk counterparts of type II spicules at the limb and believed to contribute to the coronal heating process. Previous identification of RBEs was mainly based on feature detection using Dopplergrams. In this paper, we study RBEs on 2011 October 21 in a very quiet region at th…
SMART-1 end of life shallow regolith impact simulations
Foing, B.; Burchell, M. J.; Cole, M. J. +3 more
The SMART-1 end-of-life impact with the lunar surface was simulated with impacts in a two stage light-gas gun onto inclined basalt targets with a shallow surface layer of sand. This simulated the probable impact site, where a loose regolith will have overlaid a well consolidated basaltic layer of rock. The impact angles used were at 5° and 10° fro…
Stellar rotation, binarity, and lithium in the open cluster IC 4756
Strassmeier, K. G.; Weber, M.; Granzer, T. +3 more
Context. An important aspect in the evolutionary scenario of cool stars is their rotation and the rotationally induced magnetic activity and interior mixing. Stars in open clusters are particularly useful tracers for these aspects because of their known ages.
Aims: We aim to characterize the open cluster IC 4756 and measure stellar rotation p…
Surface brightness profiles of blue compact dwarf galaxies in the GOODS-N and GOODS-S field
Kong, X.; Lian, J. H.; Jiang, N. +2 more
We investigate the structural properties of the underlying hosts of 34 blue compact dwarf (BCD) galaxies with deep near-infrared (NIR) photometry. The BCD sample is selected from the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey in the Great observatories origins Deep Survey North and South fields. We extract the surface brightness prof…
Previously hidden low-energy ions: a better map of near-Earth space and the terrestrial mass balance
André, Mats
This is a review of the mass balance of planet Earth, intended also for scientists not usually working with space physics or geophysics. The discussion includes both outflow of ions and neutrals from the ionosphere and upper atmosphere, and the inflow of meteoroids and larger objects. The focus is on ions with energies less than tens of eV origina…