Search Publications
Enhanced Nitrogen in Morphologically Disturbed Blue Compact Galaxies at 0.20 < z < 0.35: Probing Galaxy Merging Features
Rey, Soo-Chang; Kyeong, Jaemann; Sung, Eon-Chang +4 more
We present a study of correlations between the elemental abundances and galaxy morphologies of 91 blue compact galaxies (BCGs) at z = 0.20-0.35 with Sloan Digital Sky Survey (SDSS) DR7 data. We classify the morphologies of the galaxies as either "disturbed" or "undisturbed" by visual inspection of the SDSS images, and using the Gini coefficient an…
Hellas Planitia as a potential site of sedimentary minerals
Zalewska Andrzejewska, Natalia
Demonstration of the existence of clay minerals and sulfates of Hellas brings us closer to the finding that water on Mars might have existed earlier and it may even exist now. Hellas Crater is a potential area where episodes of liquid water may appear. Infrared data from OMEGA and PFS installed on the Mars Express probe have been used for the inve…
Stacking Star Clusters in M51: Searching for Faint X-Ray Binaries
Barmby, P.; Vulic, N.; Gallagher, S. C.
The population of low-luminosity (<1035 erg s-1) X-ray binaries (XRBs) has been investigated in our Galaxy and M31 but not further. To address this problem, we have used data from the Chandra X-Ray Observatory and the Hubble Space Telescope to investigate the faint population of XRBs in the grand-design spiral galaxy M51. …
Cosmological model dependence of the galaxy luminosity function: far-infrared results in the Lemaître-Tolman-Bondi model
Berta, S.; Magnelli, B.; Nordon, R. +9 more
Aims: This is the first paper of a series aiming at investigating galaxy formation and evolution in the giant-void class of the Lemaître-Tolman-Bondi (LTB) models that best fits current cosmological observations. Here we investigate the luminosity function (LF) methodology, and how its estimates would be affected by a change on the cosmologic…
Mid-infrared Spectral Properties of Post-starburst Quasars
Hines, Dean C.; Dale, Daniel A.; Canalizo, Gabriela +5 more
We present Spitzer InfraRed Spectrograph low-resolution spectra of 16 spectroscopically selected post-starburst quasars (PSQs) at z ~ 0.3. The optical spectra of these broad-lined active galactic nuclei (AGNs) simultaneously show spectral signatures of massive intermediate-aged stellar populations making them good candidates for studying the conne…
Astrometric mass ratios for three spectroscopic binaries
Sahlmann, J.; Fekel, F. C.
The orbits of five single-lined spectroscopic binaries have recently been determined. We now use astrometric measurements that were collected with the Hipparcos satellite to constrain the systems' mass ratios and secondary masses. The barycentric astrometric orbits of three binary systems, HD 140667, HD 158222, and HD 217924, are fully determined …
A modified “Type I migration” model for propeller moons in Saturn's rings
Tiscareno, Matthew S.
We propose a mechanism for the observed non-keplerian motion (Tiscareno et al., 2010a) of “propeller” moons embedded in Saturn's rings. Our mechanism, in which radial variations in surface density - external to, and unaffected by, the embedded moon - result in an equilibrium semimajor axis for the moon due to “Type I” angular momentum exchange (Cr…
Photometric Redshifts of Submillimeter Galaxies
Berta, Stefano; Pozzi, Francesca; Chakrabarti, Sukanya +4 more
We use the photometric redshift method of Chakrabarti & McKee to infer photometric redshifts of submillimeter galaxies with far-IR (FIR) Herschel data obtained as part of the PACS Evolutionary Probe program. For the sample with spectroscopic redshifts, we demonstrate the validity of this method over a large range of redshifts (4 >~ z >~ …
Cross-field Diffusion of Energetic (100 keV to 2 MeV) Protons in Interplanetary Space
Tsurutani, Bruce T.; Echer, Ezequiel; Lakhina, Gurbax S. +2 more
Magnetic field magnitude decreases (MDs) are observed in several regions of the interplanetary medium. In this paper, we characterize MDs observed by the Ulysses spacecraft instrumentation over the solar south pole by using magnetic field data to obtain the empirical size, magnetic field MD, and frequency of occurrence distribution functions. The …
Optical observations of PSR J0205+6449 - the next optical pulsar?
de Luca, A.; Rea, N.; Mignani, R. P. +3 more
PSR J0205+6449 is a young (∼5400 yr), Crab-like pulsar detected in radio and at X-ray and γ-ray energies and has the third largest spin-down flux among known rotation-powered pulsars. It also powers a bright synchrotron nebula detected in the optical and X-rays. At a distance of ∼3.2 kpc and with an extinction comparable to the Crab, PSR J0205+644…