Search Publications
Mapping young stellar populations toward Orion with Gaia DR1
Brown, A. G. A.; Manara, C. F.; de Zeeuw, P. T. +2 more
In this work we use the first data release of the Gaia mission to explore the three-dimensional arrangement and age ordering of the many stellar groups toward the Orion OB association, aiming at a new classification and characterization of the stellar population not embedded in the Orion A and B molecular clouds. We make use of the parallaxes and …
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…
Large decay of X-ray flux in 2XMM J123103.2+110648: evidence for a tidal disruption event
Ho, Luis C.; Lin, Dacheng; Godet, Olivier +3 more
The X-ray source 2XMM J123103.2+110648 was previously found to show pure thermal X-ray spectra and an ∼3.8 h periodicity in three XMM-Newton X-ray observations in 2003-2005, and the optical spectrum of the host galaxy suggested it as a type 2 active galactic nucleus candidate. We have obtained new X-ray observations of the source, with Swift and C…
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…
Dipolar modulation in the size of galaxies: the effect of Doppler magnification
Bacon, David; Bonvin, Camille; Andrianomena, Sambatra +4 more
Objects falling into an overdensity appear larger on its near side and smaller on its far side than other objects at the same redshift. This produces a dipolar pattern of magnification, primarily as a consequence of the Doppler effect. At low redshift, this Doppler magnification completely dominates the usual integrated gravitational lensing contr…
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…
Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN
Callingham, J. R.; Heywood, I.; Soria, R. +22 more
Many radio galaxies show the presence of dense and dusty gas near the active nucleus. This can be traced by both 21 cm H I absorption and soft X-ray absorption, offering new insight into the physical nature of the circumnuclear medium of these distant galaxies. To better understand this relationship, we investigate soft X-ray absorption as an indi…
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…
HR-COSMOS: Kinematics of star-forming galaxies at z 0.9
Ilbert, O.; Scoville, N.; Zamorani, G. +5 more
We present the kinematic analysis of a sub-sample of 82 galaxies at 0.75 < z < 1.2 from our new survey HR-COSMOS aimed to obtain the first statistical sample to study the kinematics of star-forming galaxies in the treasury COSMOS field at 0 < z < 1.2. We observed 766 emission line galaxies using the multi-slit spectrograph ESO-VLT/VIMO…