Search Publications
ALMA Observations of a Quiescent Molecular Cloud in the Large Magellanic Cloud
Rosolowsky, Erik; Hughes, Annie; Bernard, Jean-Philippe +19 more
We present high-resolution (subparsec) observations of a giant molecular cloud in the nearest star-forming galaxy, the Large Magellanic Cloud. ALMA Band 6 observations trace the bulk of the molecular gas in 12CO(2-1) and the high column density regions in 13CO(2-1). Our target is a quiescent cloud (PGCC G282.98-32.40, which w…
New Evidence for Charge-sign-dependent Modulation During the Solar Minimum of 2006 to 2009
Potgieter, M. S.; Vos, E. E.; Munini, R. +1 more
The PAMELA space experiment, in orbit since 2006, has measured cosmic rays (CRs) through the most recent period of minimum solar activity with the magnetic field polarity as A < 0. During this entire time, galactic electrons and protons have been detected down to 70 MV and 400 MV, respectively, and their differential variation in intensity with…
Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements
Udalski, A.; Rejkuba, M.; Anderson, J. +13 more
We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stellar remnants. We used the Hubble Space Telescope to monitor stars near the Galactic Center for three years, and we measured the brightness and positions of ∼2 million st…
Comparing Automatic CME Detections in Multiple LASCO and SECCHI Catalogs
Hess, Phillip; Colaninno, Robin C.
With the creation of numerous automatic detection algorithms, a number of different catalogs of coronal mass ejections (CMEs) spanning the entirety of the Solar and Heliospheric Observatory (SOHO) Large Angle Spectrometric Coronagraph (LASCO) mission have been created. Some of these catalogs have been further expanded for use on data from the Sola…
New Insights in the Mid-infrared Bubble N49 Site: A Clue of Collision of Filamentary Molecular Clouds
Dewangan, L. K.; Ojha, D. K.; Zinchenko, I.
We investigate the star formation processes operating in a mid-infrared bubble N49 site that harbors an O-type star in its interior, an ultracompact H II region, and a 6.7 GHz methanol maser at its edges. The 13CO line data reveal two velocity components (at velocity peaks ∼88 and ∼95 km s-1) in the direction of the bubble. A…
The Spectroscopy and H-band Imaging of Virgo Cluster Galaxies (SHIVir) Survey: Scaling Relations and the Stellar-to-total Mass Relation
Taylor, James E.; Holtzman, Jon A.; Cappellari, Michele +10 more
We present parameter distributions and fundamental scaling relations for 190 Virgo cluster galaxies in the SHIVir survey. The distribution of galaxy velocities is bimodal about V circ ∼ 125 km s-1, hinting at the existence of dynamically unstable modes in the inner regions of galaxies. An analysis of the Tully-Fisher relation…
Timing of 29 Pulsars Discovered in the PALFA Survey
Camilo, F.; Ransom, S. M.; Chatterjee, S. +38 more
We report on the discovery and timing observations of 29 distant long-period pulsars found in the ongoing Arecibo L-band Feed Array pulsar survey. Following discovery with the Arecibo Telescope, confirmation and timing observations of these pulsars over several years at Jodrell Bank Observatory have yielded high-precision positions and measurement…
Where are the Binaries? Results of a Long-term Search for Radial Velocity Binaries in Proto-planetary Nebulae
Lu, Wenxian; Van Winckel, Hans; Hrivnak, Bruce J. +3 more
We present the results of an expanded, long-term radial velocity search (25 years) for evidence of binarity in a sample of seven bright proto-planetary nebulae (PPNe). The goal is to investigate the widely held view that the bipolar or point-symmetric shapes of planetary nebulae (PNe) and PPNe are due to binary interactions. Observations from thre…
Structure, Propagation, and Expansion of a CME-driven Shock in the Heliosphere: A Revisit of the 2012 July 23 Extreme Storm
Vourlidas, Angelos; Liu, Ying D.; Hu, Huidong +2 more
We examine the structure, propagation, and expansion of the shock associated with the 2012 July 23 extreme coronal mass ejection. Characteristics of the shock determined from multi-point imaging observations are compared to in situ measurements at different locations and a complex radio type II burst, which according to our definition has multiple…
Modifying the Standard Disk Model for the Ultraviolet Spectral Analysis of Disk-dominated Cataclysmic Variables. I. The Novalikes MV Lyrae, BZ Camelopardalis, and V592 Cassiopeiae
Blair, William P.; Sion, Edward M.; Balman, Şölen +1 more
The standard disk is often inadequate to model disk-dominated cataclysmic variables (CVs) and generates a spectrum that is bluer than the observed UV spectra. X-ray observations of these systems reveal an optically thin boundary layer (BL) expected to appear as an inner hole in the disk. Consequently, we truncate the inner disk. However, instead o…