Search Publications
On the Solar Origins of Open Magnetic Fields in the Heliosphere
DeRosa, Marc L.; Schrijver, Carolus J.; Rust, David M. +4 more
A combination of heliospheric and solar data was used to identify open magnetic fields stretching from the lower corona to Earth orbit. 35 near-relativistic electron beams detected at the ACE spacecraft "labeled" the heliospheric segments of the open fields. An X-ray flare occurred <20 minutes before injection of the electrons in 25 events. The…
Effects of Solar Active Regions on Meridional Flows
Zhao, Junwei; Kosovichev, Alexander G.; Švanda, Michal
The aim of this Letter is to extend our previous study of the solar-cycle variations of meridional flows and to investigate their latitudinal and longitudinal structure in the subphotospheric layer, especially their variations in magnetic regions. Helioseismology observations indicate that mass flows around active regions are dominated by inflows …
The Extended Fe Distribution in the Intracluster Medium and the Implications Regarding AGN Heating
David, Laurence P.; Nulsen, Paul E. J.
We present a systematic analysis of XMM-Newton observations of eight cool-core clusters of galaxies and determine the Fe distribution in the intracluster medium relative to the stellar distribution in the central dominant galaxy (CDG). Our analysis shows that the Fe is significantly more extended than the stellar mass in the CDG in all of the clus…
A Giant Metrewave Radio Telescope Multifrequency Radio Study of the Isothermal Core of the Poor Galaxy Cluster AWM 4
Raychaudhury, Somak; Clarke, Tracy E.; Mazzotta, Pasquale +7 more
We present a detailed radio morphological study and spectral analysis of the wide-angle tail radio source 4C +24.36 associated with the dominant galaxy in the relaxed galaxy cluster AWM 4. Our study is based on new high-sensitivity GMRT observations at 235, 327, and 610 MHz and on literature and archival data at other frequencies. We find that the…
Independent Emission and Absorption Abundances for Planetary Nebulae
Zhang, Yong; Jenkins, Edward B.; Phillips, Mark +4 more
Emission-line abundances have been uncertain for more than a decade due to unexplained discrepancies in the relative intensities of the forbidden lines and weak permitted recombination lines in PNe and H II regions. The observed intensities of forbidden and recombination lines originating from the same parent ion differ from their theoretical valu…
Unveiling the Narrow-Line Seyfert 1 Nature of Markarian 573 Using Near-Infrared Spectroscopy
Pérez García, A. M.; Acosta-Pulido, J. A.; González-Martín, O. +1 more
In this Letter we present clear evidence that Mrk 573 is an obscured narrow-line Seyfert 1 (NLSy1) galaxy and not an archetypal Seyfert 2, as it has been classified until now. Only three galaxies have been proposed as members of this class, prior to this work. Here we report near-infrared spectroscopic data taken with LIRIS on the 4.2 m William He…
V5116 Sagittarii, an Eclipsing Supersoft Postoutburst Nova?
Greiner, J.; Hernanz, M.; Sala, G. +1 more
V5116 Sgr (Nova Sgr 2005 No. 2), discovered on 2005 July 4, was observed with XMM-Newton in 2007 March, 20 months after the optical outburst. The X-ray spectrum shows that the nova had evolved to a pure supersoft X-ray source, with no significant emission at energies above 1 keV. The X-ray light curve shows abrupt decreases and increases of the fl…
A Parameterization Study of the Properties of the X-Ray Dips in the Low-Mass X-Ray Binary X1916-053
Hu, Chin-Ping; Chou, Yi; Chung, Yi-Ying
The ultracompact low-mass X-ray binary X1916-053, which is composed of a neutron star and a semidegenerate white dwarf, exhibits periodic X-ray dips of variable width and depth. We have developed a new method to parameterize this dipping behavior to systematically study its variations. This can help in further understanding binary and accretion di…
High-Velocity Interstellar Bullets in IRAS 05506+2414: A Very Young Protostar
Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark +2 more
We have made a serendipitous discovery of an enigmatic outflow source, IRAS 05506+2414 (hereafter IRAS 05506), as part of a multiwavelength survey of pre-planetary nebulae (PPNs). The HST optical and near-infrared images show a bright compact central source with a jetlike extension, and a fanlike spray of high-velocity (with radial velocities up t…
The X-Ray-Emitting Components toward l = 111°: The Local Hot Bubble and Beyond
Kuntz, K. D.; Snowden, S. L.
We have obtained an XMM-Newton spectrum of the diffuse X-ray emission toward (l ,b) = (111.14°,1.11°) , a line of sight with a relatively simple distribution of absorbing clouds: >9 × 1019 cm-2 at R > 170 pc, a 6 × 1021 cm-2 molecular cloud at 2.5-3.3 kpc, and a total column of 1.2 × 1022