Search Publications
The M 4 Core Project with HST - V. Characterizing the PSFs of WFC3/UVIS by focus★
Anderson, J.; Bedin, L. R.
As part of the astrometric Hubble Space Telescope (HST) large program GO-12911, we conduct an in-depth study to characterize the point spread function (PSF) of the Uv-VISual channel of the Wide Field Camera 3 (WFC3), as a necessary step to achieve the astrometric goals of the program. We extracted a PSF from each of the 589 deep exposures taken th…
X Marks the Spot: Nexus of Filaments, Cores, and Outflows in a Young Star-forming Region
Bieging, John H.; Lombardi, Marco; Kong, Shuo +4 more
We present a multiwavelength investigation of a region of a nearby giant molecular cloud that is distinguished by a minimal level of star formation activity. With our new {}12{CO}(J = 2-1) and {}13{CO}(J = 2-1) observations of a remote region within the middle of the California molecular cloud, we aim to investigate the relat…
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. X. HD 96511, HR 7578, and KZ Andromedae
Henry, Gregory W.; Fekel, Francis C.; Tomkin, Jocelyn
From an extensive number of newly acquired radial velocities we determine the orbital elements for three late-type dwarf systems, HD 96511, HR 7578, and KZ And. The orbital periods are 18.89737 ± 0.00002, 46.81610 ± 0.00006, and 3.0329113 ± 0.0000005 days, respectively, and all three systems are eccentric, although KZ And is just barely so. We hav…
Dust properties of the cometary globule Barnard 207 (LDN 1489)
Togi, Aditya; Witt, Adolf N.; John, Demi St.
Barnard 207 (B207, LDN 1489, LBN 777), also known as the Vulture Head nebula, is a cometary globule in the Taurus-Auriga-Perseus molecular cloud region. B207 is known to host a Class I protostar, IRAS 04016+2610, located at a projected distance of 8400 au from the dense core centre. Using imaging and photometry over a wide wavelength range, from U…
Radio observations of the region around the pulsar wind nebula HESS J1303-631 with ATCA
Johnston, Simon; Sushch, Iurii; Oya, Igor +2 more
Radio observations of the region surrounding PSR J1301-6305 at 5.5 GHz and 7.5 GHz were conducted with ATCA on September 5, 2013. The observations were dedicated to the search of the radio counterpart of the evolved pulsar wind nebula (PWN) HESS J1303-631, which has been detected in X-rays and GeV-TeV γ-rays. The collected data do not reveal any s…
Deep Chandra observations of NGC 7457, the X-ray point source populations of a low-mass early-type galaxy
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +4 more
We present the X-ray point source population of NGC 7457 based on 124 ks of Chandra observations. Previous deep Chandra observations of low-mass X-ray binaries (LMXBs) in early-type galaxies have typically targeted the large populations of massive galaxies. NGC 7457 is a nearby, early-type galaxy with a stellar luminosity of 1.7× 10^{10}{L_{K{⊙}}}…
ALMA Compact Array observations of the Fried Egg nebula. Evidence for large-scale asymmetric mass-loss from the yellow hypergiant IRAS 17163-3907
Galván-Madrid, R.; Olofsson, H.; Justtanont, K. +12 more
Yellow hypergiants are rare and represent a fast evolutionary stage of massive evolved stars. That evolutionary phase is characterised by a very intense mass loss, the understanding of which is still very limited. Here we report ALMA Compact Array observations of a 50''-mosaic toward the Fried Egg nebula, around one of the few Galactic yellow hype…
Suzaku Wide-band All-sky Monitor (WAM) observations of GRBs and SGRs
Yamaoka, Kazutaka; Fukazawa, Yasushi; Hanabata, Yoshitaka +29 more
We will review results for gamma-ray bursts (GRBs) and soft gamma repeaters (SGRs), obtained from the Suzaku Wide-band All-sky Monitor (WAM) which operated for about 10 years from 2005 to 2015. The WAM is a BGO (bismuth germanate: Bi4Ge3O12) lateral shield for the Hard X-ray Detector (HXD), used mainly for rejectin…
Photo-z-SQL: Integrated, flexible photometric redshift computation in a database
Beck, R.; Szalay, A. S.; Csabai, I. +2 more
We present a flexible template-based photometric redshift estimation framework, implemented in C#, that can be seamlessly integrated into a SQL database (or DB) server and executed on-demand in SQL. The DB integration eliminates the need to move large photometric datasets outside a database for redshift estimation, and utilizes the computational c…
Which Bow Shock Theory, Gasdynamic or Magnetohydrodynamic, Better Explains CME Stand-off Distance Ratios from LASCO-C2 Observations ?
Cho, K. -S.; Moon, Y. -J.; Kim, R. -S. +2 more
It is generally believed that fast coronal mass ejections (CMEs) can generate their associated shocks, which are characterized by faint structures ahead of CMEs in white-light coronagraph images. In this study, we examine whether the observational stand-off distance ratio, defined as the CME stand-off distance divided by its radius, can be explain…