Search Publications
Exploring high-z galaxies with the E-ELT
Gullieuszik, M.; Falomo, R.; Greggio, L. +2 more
We present simulated observations of galaxies at z = 2 and z = 3 to probe the capabilities of next-generation telescopes (E-ELT and JWST) to measure the structural and photometrical properties of high-redshift galaxies. We carry out an extensive set of simulations of high-redshift galaxies adopting the specifications of the E-ELT first light instr…
Study of a bright-rimmed cloud at the border of the infrared dust bubble CN20
Rubio, M.; Ortega, M. E.; Giacani, E. +1 more
We characterize an uncatalogued bright-rimmed cloud located at the border of the infrared dust bubble CN20 with the aim of investigating triggered star formation. In order to do this, we carried out radio continuum observations at 8.9 GHz using the Jansky Very Large Array (JVLA) interferometer with a synthesized beam size of 13 arcsec × 5 arcsec, …
X-ray study of the supernova remnant G337.2-0.7
Koyama, Katsuji; Uchida, Hiroyuki; Nobukawa, Masayoshi +3 more
This paper reports on the Suzaku result of the Galactic supernova remnant (SNR) G337.2-0.7. The X-ray spectrum is well explained by three components in ionizing phase. One is a plasma with a low temperature kT = 0.70_{-0.03}^{+0.02}keV, solar abundances, and an ionization parameter n_et = 5.7^{+0.7}_{-0.4}× 10^{11}s cm-3. The second is …
Radiation-driven winds of hot luminous stars. XVIII. The unreliability of stellar and wind parameter determinations from optical vs. UV spectral analysis of selected central stars of planetary nebulae and the possibility of some CSPNs as single-star supernova Ia progenitors
Pauldrach, A. W. A.; Kaschinski, C. B.; Hoffmann, T. L.
Context. The uncertainty in the degree to which radiation-driven winds of hot stars might be affected by small inhomogeneities in the density leads to a corresponding uncertainty in the determination of the atmospheric mass loss rates from the strength of optical recombination lines and - since the mass loss rate is not a free parameter but a func…
X-ray and infrared diagnostics of nearby active galactic nuclei with MAXI and AKARI
Nakagawa, Takao; Baba, Shunsuke; Isobe, Naoki +5 more
Nearby active galactic nuclei were diagnosed in the X-ray and mid-to-far infrared wavelengths with Monitor of All-sky X-ray Image (MAXI) and the Japanese infrared observatory AKARI, respectively. One hundred of the X-ray sources listed in the second release of the MAXI all-sky X-ray source catalog are currently identified as non-blazar-type active…
Analysis of horizontal flows in the solar granulation
Suematsu, Y.; Shimizu, T.; Quintero Noda, C.
Solar limb observations sometimes reveal the presence of a satellite lobe in the blue wing of the Stokes I profile from pixels belonging to granules. The presence of this satellite lobe has been associated in the past to strong line-of-sight gradients and, as the line-of-sight component is almost parallel to the solar surface, to horizontal granul…
A dual velocity in the highly ionized wind of the luminous narrow line Seyfert galaxy PG 1211+143
Vaughan, S.; Reeves, J. N.; Pounds, K. A. +1 more
An extended XMM-Newton observation of the luminous narrow line Seyfert galaxy PG 1211+143 in 2014 has revealed a complex high velocity outflow, with components distinguished in velocity, ionization and short-term variability. We report here the detection of previously unseen spectral structure in Fe K absorption, finding a second velocity componen…
Spectral mapping of V348 Puppis: spiral arms in the period gap
Saito, R. K.; Baptista, R.
We report the analysis of Hubble Space Telescope (HST) UV-optical spectroscopy of the nova-like variable V348 Puppis with eclipse mapping techniques. We measured the eclipse width at disc centre and determined a lower limit on the mass ratio of q > 0.3, with a tight relation between q and the binary inclination i. For 0.31 ≤ q ≤ 0.6, we have 79…
Coronal partings
Dumin, Yurii V.; Nikulin, Igor F.
The basic observational properties of "coronal partings"-the special type of quasi-one-dimensional magnetic structures, identified by a comparison of the coronal X-ray and EUV images with solar magnetograms-are investigated. They represent the channels of opposite polarity inside the unipolar large-scale magnetic fields, formed by the rows of magn…
X-Raying the Dark Side of Venus—Scatter from Venus’ Magnetotail?
Weber, M.; Peres, G.; Reale, F. +3 more
We analyze significant X-ray, EUV, and UV emission coming from the dark side of Venus observed with Hinode/XRT and Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) during a transit across the solar disk that occurred in 2012. As a check we have analyzed an analogous Mercury transit that occurred in 2006. We have used the latest ve…