Search Publications
Three predictions: Comet 67P/Churyumov-Gerasimenko, comet C/2012 K1 PANSTARRS, and comet C/2013 V5 Oukaimeden
Ferrín, Ignacio
We make the following predictions: (1) The secular light curve (SLC) of comet 67P/Churyumov-Gerasimenko exhibits a photometric anomaly in magnitude that is present in 1982, 1996, 2002 and 2009. Thus it must be real. We interpret this anomaly as a topographic feature on the surface of the nucleus that may be a field of debris, a region made only of…
Activity-related variations of high-degree p-mode amplitude, width, and energy in solar active regions
Chae, J.; Maurya, R. A.; Ambastha, A.
Context. Solar energetic transients such as flares and coronal mass ejections occur mostly within active regions (ARs) and release large amounts of energy, which is expected to excite acoustic waves by transferring the mechanical impulse of the thermal expansion of the flare on the photosphere. On the other hand, strong magnetic fields of AR sunsp…
Stereoscopic investigation on plasma density fluctuations in the outer solar corona
Romano, P.; Antonucci, E.; Spadaro, D. +3 more
This research note extends a previous work focused on the 2D reconstruction of the spatial distribution and temporal evolution of the plasma density fluctuations in the outer solar corona and based on STEREO COR1-A white-light observations. By using the corresponding total brightness images obtained in the same observational period with the corona…
First results with the boloSource() algorithm: photometry of faint standard stars observed by Herschel/PACS
Marton, G.; Müller, T. G.; Kiss, C. +1 more
The boloSource() algorithm is a tool to separate the signal of compact sources from that of the diffuse background in the timeline of far-infrared measurements performed by the PACS camera of the Herschel Space Observatory. An important characteristic and quality indicator of this method is that how well it can reproduce the flux of faint standard…
The Curious Morphology and Orientation of Orion Proplyd HST-10
Morris, Mark R.; Bally, John; Kassis, Marc +1 more
HST-10 is one of the largest proplyds in the Orion Nebula and is located approximately 1' SE of the Trapezium. Unlike other proplyds in Orion, however, the long-axis of HST-10 does not align with θ1 C, but is instead aligned with the rotational axis of the HST-10 disk. This cannot be easily explained using current photoevaporation model…
Herschel-Planck dust optical-depth and column-density maps (Corrigendum). I. Method description and results for Orion
Alves, João; Bouy, Hervé; Lada, Charles J. +1 more
XMM-Newton and Canadian Galactic Plane Survey observations of the supernova remnant G107.5-1.5
Jackson, M. S.; Safi-Harb, S.; Kothes, R.
We present an XMM-Newton observation of the highly polarized low-surface-brightness supernova remnant (SNR) G107.5-1.5, discovered with the Canadian Galactic Plane Survey. We do not detect diffuse X-ray emission from the SNR and set an upper limit on the surface brightness of ∼2 × 1030 erg arcmin-2 s-1, at an assum…
Updated Models for the Creation of a Low-Z Qso Absorber By a Dwarf Galaxy Wind
Danforth, Charles W.; Stocke, John T.; Keeney, Brian A. +2 more
We present new GALEX images and optical spectroscopy of J1229+02, a dwarf post-starburst galaxy located 81 kpc from the 1585 km {{s}-1} absorber in the 3C 273 sight line. The absence of Hα emission and the faint GALEX UV fluxes confirm that the galaxy's recent star formation rate is \lt {{10}-3} {{M}⊙ } y{{r}-…
Stellar content of the interacting galaxies IC 1727 and NGC 672
Tikhonov, N. A.; Galazutdinova, O. A.; Lebedev, V. S.
Based on archival Hubble Space Telescope ACS/WFC images, we have performed stellar photometry for an isolated pair of interacting galaxies, IC 1727 and NGC 672, and constructed their Hertzsprung-Russell diagrams. The galaxy IC 1727 exhibits a strong asymmetry in the apparent distribution of young stars. The distribution of old stars is smoother an…
The optical emission lines of type 1 X-ray bright Active Galactic Nuclei
La Mura, G.; Ciroi, S.; Cracco, V. +3 more
A strong X-ray emission is one of the defining signatures of nuclear activity in galaxies. According to the Unified Model for Active Galactic Nuclei (AGN), both the X-ray radiation and the prominent broad emission lines, characterizing the optical and UV spectra of Type 1 AGNs, are originated in the innermost regions of the sources, close to the S…