Search Publications
Discovery of a 6.4 h black hole binary in NGC 4490
Sidoli, L.; Esposito, P.; Motta, S. E. +3 more
We report on the discovery with Chandra of a strong modulation (∼90 per cent pulsed fraction) at ∼6.4 h from the source CXOU J123030.3+413853 in the star-forming, low-metallicity spiral galaxy NGC 4490, which is interacting with the irregular companion NGC 4485. This modulation, confirmed also by XMM-Newton observations, is interpreted as the orbi…
A Spitzer Study of Pseudobulges in S0 Galaxies: Secular Evolution of Disks
Kembhavi, Ajit; Barway, Sudhanshu; Vaghmare, Kaustubh
In this Letter, we present a systematic study of lenticular (S0) galaxies based on mid-infrared imaging data on 185 objects taken using the Spitzer Infrared Array Camera. We identify the S0s hosting pseudobulges based on the position of the bulge on the Kormendy diagram and the Sérsic index of the bulge. We find that pseudobulges preferentially oc…
The build-up of nuclear stellar cusps in extreme starburst galaxies and major mergers
Sanders, D. B.; Surace, J. A.; Inami, H. +15 more
Nuclear stellar cusps are defined as central excess light component in the stellar light profiles of galaxies and are suggested to be stellar relics of intense compact starbursts in the central ∼100-500 pc region of gas-rich major mergers. Here, we probe the build-up of nuclear cusps during the actual starburst phase for a complete sample of lumin…
Decline and Recovery of the Interplanetary Magnetic Field during the Protracted Solar Minimum
Schwadron, Nathan A.; Smith, Charles W.; DeForest, Craig E.
The interplanetary magnetic field (IMF) is determined by the amount of solar magnetic flux that passes through the top of the solar corona into the heliosphere, and by the dynamical evolution of that flux. Recently, it has been argued that the total flux of the IMF evolves over the solar cycle due to a combination of flux that extends well outside…
An Updated View of Solar Eruptive Flares and the Development of Shocks and CMEs: History of the 2006 December 13 GLE-Productive Extreme Event
Grechnev, Victor V.; Kiselev, Valentin I.; Uralov, Arkadiy M. +2 more
An extreme 2006 December 13 event marked the onset of the Hinode era, being the last major flare in the solar cycle 23 observed with NoRH and NoRP. The event produced a fast CME, strong shock, and a big particle event responsible for GLE70. We endeavor to clarify the relations between the eruptions, shock wave, and flare, and to shed light on a de…
Earth's collision with a solar filament on 21 January 2005: Overview
Escoubet, C. P.; Tsurutani, B. T.; Lepri, S. T. +5 more
21 January 2005, one of the fastest interplanetary coronal mass ejections (ICME) of solar cycle 23, containing exceptionally dense plasma directly behind the sheath, hit the magnetosphere. We show from charge-state analysis that this material was a piece of the erupting solar filament and further, based on comparisons to the simulation of a fast C…
ARTEMIS II: A Second-Generation Catalog of LASCO Coronal Mass Ejections Including Mass and Kinetic Energy
Llebaria, A.; Lamy, P.; Floyd, O. +1 more
The ARTEMIS-I catalog of coronal mass ejections (CMEs) was initially developed on a first generation of low-resolution synoptic maps constructed from the SOHO/LASCO-C2 images of the K-corona and resulted in an online database listing all events detected since January 1996 (Boursier et al., Solar Phys.257, 125, 2009). A new generation of synoptic m…
Anchors for the cosmic distance scale: the Cepheids U Sagittarii, CF Cassiopeiae, and CEab Cassiopeiae
Kovtyukh, V.; Bonatto, C.; Moni Bidin, C. +11 more
New and existing X-ray, UBVJHKsW(1 - 4), and spectroscopic observations were analyzed to constrain fundamental parameters for M 25, NGC 7790, and dust along their sight-lines. The star clusters are of particular importance because they host the classical Cepheids U Sgr, CF Cas, and the visual binary Cepheids CEa and CEb Cas. …
Herschel survey of brown dwarf disks in ρ Ophiuchi
Pinte, C.; Könyves, V.; Ábrahám, P. +6 more
Context. Young brown dwarfs are known to possess circumstellar disks, a characteristic that is fundamental to the understanding of their formation process, and raises the possibility that these objects harbour planets.
Aims: We want to characterise the far-IR emission of disks around the young brown dwarf population of the ρ Ophiuchi cluster …
APEX/SABOCA observations of small-scale structure of infrared-dark clouds . I. Early evolutionary stages of star-forming cores
Henning, Thomas; Beuther, Henrik; Ragan, Sarah E.
Infrared-dark clouds (IRDCs) harbor the early phases of cluster and high-mass star formation and are comprised of cold (~20 K), dense (n > 104 cm-3) gas. The spectral energy distribution (SED) of IRDCs is dominated by the far-infrared and millimeter wavelength regime, and our initial Herschel study examined IRDCs at the pe…