Search Publications
The structures of distant galaxies - V. The evolution of galaxy structure in stellar mass at z<1
Conselice, C. J.; Lanyon-Foster, M. M.; Merrifield, M. R.
The structure and morphology of a galaxy are nearly always studied using the light originating from stars; however, ideally one is interested in measuring structure using the stellar mass distribution. Not only does stellar mass trace out the underlying distribution of matter, it also minimizes the effects of star formation and dust on the appeara…
DASCH Discovery of a Possible Nova-like Outburst in a Peculiar Symbiotic Binary
Quinn, Samuel N.; Orosz, Jerome A.; Grindlay, Jonathan E. +4 more
We present photometric and spectroscopic observations of a peculiar variable (designated DASCH J075731.1+201735 or J0757) discovered from our DASCH project using the digitized Harvard College Observatory archival photographic plates. It brightened by about 1.5 mag in B within a year starting in 1942, and then slowly faded back to its pre-outburst …
High spatial resolution VAULT H-Lyα observations and multiwavelength analysis of an active region filament
Vial, J. -C.; Yurchyshyn, V.; Vourlidas, A. +2 more
Context. The search for the fine structure of prominences has received considerable new attention thanks to the Swedish Solar Telescope (SST) Hα pictures that provide an unsurpassed spatial resolution. Recently, it has been shown that the filaments' coronal environment, at least for quiescent filaments, is perturbed by either cool absorbing materi…
Spatial matter density mapping of the STAGES Abell A901/2 supercluster field with 3D lensing
Simon, P.; Heymans, C.; Schrabback, T. +13 more
We present weak lensing data from the Hubble Space Telescope(HST)/Space Telescope A901/902 Galaxy Evolution Survey (STAGES) survey to study the three-dimensional spatial distribution of matter and galaxies in the Abell 901/902 supercluster complex. Our method improves over the existing 3D lensing mapping techniques by calibrating and removing reds…
Atomic hydrogen, star formation and feedback in the lowest mass blue compact dwarf galaxies
Chiboucas, Kristin; Tully, R. Brent; Karachentsev, Igor D. +3 more
We present the results from a search for H I emission from a sample of newly discovered dwarf galaxies in the M81 group. H I is detected in three galaxies, all of which are classified as blue compact dwarf galaxies (BCDs). The H I masses of these galaxies are ∼106 M⊙, making them some of the lowest mass BCDs known. For these …
The Spindle: An Irradiated Disk and Bent Protostellar Jet in Orion
Ginsburg, Adam; Youngblood, Allison; Bally, John
We present Hubble Space Telescope observations of a bent, pulsed Herbig-Haro jet, HH 1064, emerging from the young star Parenago 2042 embedded in the H II region NGC 1977 located about 30' north of the Orion Nebula. This outflow contains eight bow shocks in the redshifted western lobe and five bow shocks in the blueshifted eastern lobe. Shocks wit…
Abell 1201: A Minor Merger at Second Core Passage
McNamara, Brian R.; Nulsen, Paul E. J.; Murray, Stephen S. +3 more
We present an analysis of the structures and dynamics of the merging cluster Abell 1201, which has two sloshing cold fronts around a cooling core, and an offset gas core approximately 500 kpc northwest of the center. New Chandra and XMM-Newton data reveal a region of enhanced brightness east of the offset core, with breaks in surface brightness al…
Upper limit for the D2H+ ortho-to-para ratio in the prestellar core 16293E (CHESS)
Codella, C.; Ceccarelli, C.; Lis, D. C. +6 more
The H_3^+ ion plays a key role in the chemistry of dense interstellar gas clouds where stars and planets are forming. The low temperatures and high extinctions of such clouds make direct observations of H_3^+ impossible, but lead to large abundances of H2D+ and D2H+, which are very useful probes of the e…
Late-stage impacts and the orbital and thermal evolution of Tethys
Zhang, Ke; Nimmo, Francis
An inferred ancient episode of heating and deformation on Tethys has been attributed to its passage through a 3:2 resonance with Dione (Chen, E.M.A., Nimmo, F. [2008]. Geophys. Res. Lett. 35, 19203). The satellites encounter, and are trapped into, the e-Dione resonance before reaching the e-Tethys resonance, limiting the degree to which Tethys is …
Orbit determination of close binary systems using lucky imaging
Rica, F. M.; Barrena, R.; Vázquez, G. +2 more
We present relative positions of visual binaries observed in 2009 with the FastCam 'lucky-imaging' camera mounted on the 1.5-m Carlos Sánchez Telescope at the Observatorio del Teide. We obtained 424 CCD observations (averaged in 198 mean relative positions) of 157 binaries with angular separations in the range 0.14-15.40 arcsec, with a median sepa…