Search Publications
The XMM Cluster Survey: the halo occupation number of BOSS galaxies in X-ray clusters
Streblyanska, Alina; Schneider, Donald P.; Hilton, Matt +26 more
We present a direct measurement of the mean halo occupation distribution (HOD) of galaxies taken from the eleventh data release (DR11) of the Sloan Digital Sky Survey-III Baryon Oscillation Spectroscopic Survey (BOSS). The HOD of BOSS low-redshift (LOWZ: 0.2 < z < 0.4) and Constant-Mass (CMASS: 0.43 < z < 0.7) galaxies is inferred via …
A Suzaku observation of the low-mass X-ray binary GS 1826-238 in the hard state
Makishima, Kazuo; Nakazawa, Kazuhiro; Zhang, Zhongli +2 more
The neutron star low-mass X-ray binary GS 1826-238 was observed with Suzaku on 2009 October 21, for a total exposure of 1030 ks. Except for the type I bursts, the source intensity was constant within ∼10%. Combining the Suzaku XIS, HXD-PIN, and HXD-GSO data, burst-removed persistent emission was detected over the 0.8-100 keV range, at an unabsorbe…
High-mass Star Formation Toward Southern Infrared Bubble S10
Tej, Anandmayee; Ishwara Chandra, C. H.; Vig, Sarita +2 more
An investigation in radio and infrared wavelengths of two high-mass star-forming regions toward the southern Galactic bubble S10 is presented here. The two regions under study are associated with the broken bubble S10 and Extended Green Object, G345.99-0.02, respectively. Radio continuum emission mapped at 610 and 1280 MHz using the Giant Metrewav…
Fermi-LAT Observations of Supernova Remnant G5.7-0.1, Believed to be Interacting with Molecular Clouds
Slane, Patrick; Castro, Daniel; Gelfand, Joseph +1 more
This work reports on the detection of γ-ray emission coincident with the supernova remnant (SNR) G5.7-0.1 using data collected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The SNR is believed to be interacting with molecular clouds, based on 1720 MHz hydroxyl (OH) maser emission observations in its direction. This inte…
Dense Molecular Cores Being Externally Heated
Kim, Gwanjeong; Kim, Mi-Ryang; Lee, Chang Won +2 more
We present results of our study of eight dense cores, previously classified as starless, using infrared (3-160 µm) imaging observations with the AKARI telescope and molecular line (HCN and N2H+) mapping observations with the KVN telescope. Combining our results with the archival IR to millimeter continuum data, we exami…
Towards 21st century stellar models: Star clusters, supercomputing and asteroseismology
Christensen-Dalsgaard, J.; Stello, D.; D'Orazi, V. +8 more
Stellar models provide a vital basis for many aspects of astronomy and astrophysics. Recent advances in observational astronomy - through asteroseismology, precision photometry, high-resolution spectroscopy, and large-scale surveys - are placing stellar models under greater quantitative scrutiny than ever. The model limitations are being exposed a…
An Imaging Study of a Complex Solar Coronal Radio Eruption
Feng, S. W.; Chen, Y.; Song, H. Q. +2 more
Solar coronal radio bursts are enhanced radio emission excited by energetic electrons accelerated during solar eruptions. Studying these bursts is important for investigating the origin and physical mechanism of energetic particles and further diagnosing coronal parameters. Earlier studies suffered from a lack of simultaneous high-quality imaging …
Evidence of Energy Supply by Active-Region Spicules to the Solar Atmosphere
Ahangarzadeh Maralani, A. R.; Tavabi, E.; Ajabshirizadeh, A. +1 more
We investigate the role of active-region spicules in the mass balance of the solar wind and energy supply in heating the solar atmosphere. We use high-cadence observations from the Solar Optical Telescope (SOT) onboard the Hinode satellite in the Ca II H-line filter obtained on 26 January 2007. The observational technique provides the high spatio-…
Far-UV Emission Properties of FR1 Radio Galaxies
Danforth, Charles W.; France, Kevin; Stocke, John T. +2 more
The power mechanism and accretion geometry for low-power FR 1 radio galaxies are poorly understood in comparison to those for Seyfert galaxies and QSOs. In this paper, we use the diagnostic power of the Lyα recombination line observed using the Cosmic Origins Spectrograph (COS) aboard the Hubble Space Telescope (HST) to investigate the accretion f…
Limits on entanglement effects in the string landscape from Planck and BICEP/Keck data
Kinney, William H.
We consider observational limits on a proposed model of the string landscape in inflation. In this scenario, effects from the decoherence of entangled quantum states in long-wavelength modes in the universe result in modifications to the Friedmann Equation and a corresponding modification to inflationary dynamics. Previous work [1, 2] suggested th…