Search Publications
High-excitation OH and H2O Lines in Markarian 231: The Molecular Signatures of Compact Far-infrared Continuum Sources
Smith, Howard A.; Ashby, Matthew L. N.; González-Alfonso, Eduardo +3 more
The ISO LWS far-infrared spectrum of the ultraluminous galaxy Mrk 231 shows OH and H2O lines in absorption from energy levels up to 300 K above the ground state, and emission in the [O I] 63 µm and [C II] 158 µm lines. Our analysis shows that OH and H2O are radiatively pumped by the far-infrared continuum emission…
Deep Spectroscopy of Systematically Surveyed Extended Lyα Sources at z ~ 3-5
Ouchi, Masami; Shimasaku, Kazuhiro; Ueda, Yoshihiro +4 more
Spatially extended Lyα sources that are faint and/or compact in continuum are candidates for extremely young (lesssim107 yr) galaxies at high redshifts. We present medium-resolution (R ~ 2000) VLT/VIMOS spectroscopy of 18 such extended Lyα sources found in our previous study at z ~ 3-5. The deep spectroscopy showed that all 18 objects h…
Hard X-Ray Emission of the Microquasar GRO J1655-40 during the Rise of Its 2005 Outburst
Joinet, A.; Kalemci, E.; Senziani, F.
We present an analysis of the high-energy emission of the Galactic black hole GRO J1655-40 at the beginning of its 2005 outburst. The data from 458 ks of INTEGRAL observations, spread over 4 weeks, are analyzed, along with the existing simultaneous RXTE and Swift data. The high-energy data allow us to detect the presence of a high-energy cutoff an…
On the Origin of Bimodal Horizontal Branches in Massive Globular Clusters: The Case of NGC 6388 and NGC 6441
Joo, Seok-Joo; Han, Sang-Il; Ree, Chang H. +3 more
Despite the efforts of the past decade, the origin of the bimodal horizontal branch (HB) found in some globular clusters (GCs) remains a conundrum. Inspired by the discovery of multiple stellar populations in the most massive Galactic GC, ω Centauri, we investigate the possibility that two distinct populations may coexist and are responsible for t…
Observation and Modeling of Coronal "Moss" With the EUV Imaging Spectrometer on Hinode
Winebarger, Amy R.; Warren, Harry P.; Doschek, George A. +2 more
Observations of transition region emission in solar active regions represent a powerful tool for determining the properties of hot coronal loops. We present the analysis of new observations of active region moss taken with the Extreme Ultraviolet Imaging Spectrometer (EIS) on the Hinode satellite. EIS observations of a density sensitive Fe XII lin…
X-Ray Emission from Active Galactic Nuclei with Intermediate-Mass Black Holes
Rao, A. R.; Dewangan, G. C.; Mathur, S. +1 more
We present a systematic X-ray study of eight active galactic nuclei (AGNs) with intermediate-mass black holes (MBH ~ 8-95 × 104 M⊙) based on 12 XMM-Newton observations. The sample includes the two prototype AGNs in this class—NGC 4395 and POX 52 and six other AGNs discovered with the Sloan Digitized Sky Survey. The…
MOST Space-based Photometry of the Transiting Exoplanet System HD 209458: Transit Timing to Search for Additional Planets
Moffat, Anthony F. J.; Rucinski, Slavek M.; Rowe, Jason F. +7 more
We report on the measurement of transit times for the HD 209458 planetary system from photometry obtained with the MOST (Microvariability and Oscillations of Stars) space telescope. Deviations from a constant orbital period can indicate the presence of additional planets in the system that are yet undetected, potentially with masses approaching an…
The Red Sequence of High-Redshift Clusters: A Comparison with Cosmological Galaxy Formation Models
Demarco, R.; Rosati, P.; Gobat, R. +4 more
We compare the results from a state-of-the-art semianalytic model of galaxy formation with spectrophotometric observations of distant galaxy clusters observed in the range 0.8 <= z<= 1.3. We investigate the properties of their red sequence (RS) galaxies and compare them with those of the field at the same redshift. In our model we find that …
Study of Magnetic Channel Structure in Active Region 10930
Jing, Ju; Wang, Haimin; Tan, Changyi +2 more
The concept of "magnetic channel" was first introduced by Zirin & Wang. They were defined as a series of oppositely directed vertical-field inversions separated by extremely narrow elongated transverse fields. In this paper, we utilized unprecedented filtergraph and spectropolarimetry observations from Hinode, and studied the evolution and phy…
A Massive-Star-forming Infrared Loop around the Crab-like Supernova Remnant G54.1+0.3: Post-Main-Sequence Triggered Star Formation?
Lee, Jeong-Eun; Onaka, Takashi; Koo, Bon-Chul +6 more
We report the discovery of a star-forming loop around the young, Crab-like supernova remnant (SNR) G54.1+0.3 using the AKARI infrared satellite. The loop consists of at least 11 young stellar objects (YSOs) embedded in a ringlike diffuse emission of radius ~1'. The YSOs are bright in the mid-infrared and are also visible in the Spitzer Space Teles…