Search Publications
Solar energetic particle arrival at Mars due to the 27 January 2012 solar storm
Kallio, E.; Barabash, S.; Winningham, J. D. +7 more
On January 27, 2012, an X-class flare brightened on the Sun at 18:15 UT. This event was associated with the generation of a high-energy stream of Solar Energetic Particles (SEPs) advancing along the Interplanetary Magnetic Field (IMF) which arrived at Mars in about 39 minutes. A Coronal Mass Ejection (CME) arrived at Mars several days later. The E…
Disk Mass-to-light Ratio Distribution from Stellar Population Synthesis: Application to Rotation Curve Decomposition of NGC 5278 (KPG 390 A)
Rosado, M.; Gabbasov, R.; Repetto, P. +1 more
In this work we extend the study on the mass distribution of the spiral galaxy NGC 5278, performing 1D and 2D (GALFIT) bulge-disk decomposition to determine which components constitute the baryonic mass in this galaxy. Our analysis does not detect any bulge; instead we find a bright source probably related to the central active galactic nucleus an…
Similarities and differences in the spectral behavior of W Ser and UX Mon in the ultraviolet
Sanad, M. R.; Bobrowsky, M.
We present ultraviolet spectra of two eclipsing interacting binary systems, W Ser and UX Mon, with good coverage over the 14.16-day and 5.9-day orbital periods, respectively, using observations taken by the International Ultraviolet Explorer (IUE) during the period between 1978–1993 and 1981–1991. Two profiles of W Ser and UX Mon showing variation…
Far-ultraviolet Spectroscopy of the Nova-like Variable KQ Monocerotis: A New SW Sextantis Star?
Bond, Howard E.; Sion, Edward M.; Wolfe, Aaron
New optical spectra obtained with the SMARTS 1.5 m telescope and archival International Ultraviolet Explorer (IUE) far-ultraviolet (FUV) spectra of the nova-like variable KQ Mon are discussed. The optical spectra reveal Balmer lines in absorption as well as He I absorption superposed on a blue continuum. The 2011 optical spectrum is similar to the…
X-Ray and Radio Follow-up Observations of High-redshift Blazar Candidates in the Fermi-LAT Unassociated Source Population
Kataoka, J.; Maeda, K.; Inoue, S. +6 more
We report on the results of X-ray and radio follow-up observations of two GeV gamma-ray sources 2FGL J0923.5+1508 and 2FGL J1502.1+5548, selected as candidates for high-redshift blazars from unassociated sources in the Fermi Large Area Telescope Second Source Catalog. We utilize the Suzaku satellite and the VLBI Exploration of Radio Astrometry (VE…
Investigation of CME properties using the data of SDO and PROBA2 spacecraft
Fainshtein, V. G.; Egorov, Ya. I.
Formation and motion (at the initial stage) of six limb CMEs detected in the period June 2010 to June 2011 are investigated using the high-resolution data of the PROBA2 and SDO spacecraft combined with the data of SOHO/LASCO coronagraphs. It is demonstrated that several loop-like structures of enhanced brightness originate in the region of CME for…
Bulk motion measurements in clusters of galaxies with ATHENA-like missions
Nevalainen, J.
The hierarchical formation of clusters of galaxies by accretion of material releases gravitational energy which dissipates into the intracluster gas. The process heats the material and generates gas turbulence and bulk motions and thus kinetic pressure. Mapping the velocity fields of the moving subunits would enable a new diagnostics tool for clus…
Ortho/Para Ratio of H2O+ Toward Sagittarius B2(M) Revisited
Bergin, Edwin A.; Lis, Dariusz C.; Schilke, Peter +2 more
The HIFI instrument aboard the Herschel satellite has allowed the observation and characterization of light hydrides, the building blocks of interstellar chemistry. In this article, we revisit the ortho/para ratio for H2O+ toward the Sgr B2(M) cloud core. The line of sight toward this star forming region passes through several spiral arms and the …
Spectroscopic observations of the interacting massive binary AQ Cassiopea
Ibanoglu, C.; Çakırlı, Ö.; Sipahi, E.
New spectroscopic observations of the double-lined eclipsing binary AQ Cas are presented. All available spectroscopic and photometric observations have been analysed for the fundamental properties of the components. Analyses show that the system consists of a massive primary with a mass of 17.63 ± 0.91 M⊙ and radius of 13.48 ± 0.64 R
Multiwavelength Photometry and Hubble Space Telescope Spectroscopy of the Old Nova V842 Centaurus
Szkody, Paula; Sion, Edward M.; Godon, Patrick +5 more
We present ground-based optical and near infrared photometric observations and Hubble Space Telescope (HST) COS spectroscopic observations of the old nova V842 Cen (Nova Cen 1986). Analysis of the optical light curves reveals a peak at 56.5 ± 0.3 s with an amplitude of 8.9 ± 4.2 mma, which is consistent with the rotation of a magnetic white dwarf …