Search Publications
The Local Spiral Arm in the LAMOST-Gaia Common Stars?
Zhang, Yong; Wu, Yue; Liu, Chao +7 more
Using the LAMOST-Gaia common stars, we demonstrate that the in-plane velocity fields for the nearby young stars are significantly different from those for the old ones. For the young stars, the probably perturbed velocities that are similar to the old population are mostly removed from the velocity maps in the X-Y plane. The residual velocity fiel…
A Very Large (θ E ≳ 40″) Strong Gravitational Lens Selected with the Sunyaev-Zel’dovich Effect: PLCK G287.0+32.9 (z = 0.38)
Koekemoer, Anton M.; Zitrin, Adi; Nonino, Mario +7 more
Since galaxy clusters sit at the high end of the mass function, the number of galaxy clusters both massive and concentrated enough to yield particularly large Einstein radii poses useful constraints on cosmological and structure formation models. To date, less than a handful of clusters are known to have Einstein radii exceeding ∼ 40\prime\pr…
A Multi-wavelength Analysis of Binary-AGN Candidate PSO J334.2028+01.4075
Gezari, Suvi; Gültekin, Kayhan; Runnoe, Jessie +4 more
We present an analysis of the first Chandra observation of PSO J334.2028+01.4075 (PSO J334), targeted as a binary-AGN candidate based on periodic variations of the optical flux. With no prior targeted X-ray coverage for PSO J334, our new 40 ks Chandra observation allows for the opportunity to differentiate between a single- or binary-AGN system, a…
Integral Field Spectroscopy of Balmer-dominated Shocks in the Magellanic Cloud Supernova Remnant N103B
Ghavamian, Parviz; Williams, Brian J.; Winkler, P. Frank +4 more
We present results of integral field spectroscopy of Balmer-dominated shocks in the LMC supernova remnant (SNR) N103B, carried out using the Wide Field Integral Spectrograph (WiFeS ) on the 2.3 m telescope at the Siding Spring Observatory in Australia. Existing X-ray studies of N103B have indicated an SN Ia origin. Radiative shock emission from cl…
Detection of Enhanced Central Mass-to-light Ratios in Low-mass Early-type Galaxies: Evidence for Black Holes?
Pechetti, Renuka; Strader, Jay; Mieske, Steffen +4 more
We present dynamical measurements of the central mass-to-light ratio (M/L) of a sample of 27 low-mass early-type {{ATLAS}}3{{D}} galaxies. We consider all {{ATLAS}}3{{D}} galaxies with 9.7 < log({M}\star /{M}⊙ ) < 10.5 in our analysis, selecting out galaxies with available high-resolution Hubble Sp…
The Slow Orbital Evolution of the Accreting Millisecond Pulsar IGR J0029+5934
Patruno, Alessandro
The accreting millisecond pulsars IGR J00291+5934 and SAX J1808.4-3658 are two compact binaries with very similar orbital parameters. The latter has been observed to evolve on a very short timescale of ∼70 Myr, which is more than an order of magnitude shorter than expected. There is an ongoing debate on the possibility that the pulsar spin-down po…
A Massive Molecular Outflow in the Dense Dust Core AGAL G337.916-00.477
Tokuda, Kazuki; Tachihara, Kengo; Kaneda, Hidehiro +9 more
Massive molecular outflows erupting from high-mass young stellar objects (YSOs) provide important clues to understanding the mechanism of high-mass star formation. Based on new CO J = 3-2 and J = 1-0 observations using the Atacama Submillimeter Telescope Experiment (ASTE) and Mopra telescope facilities, we discovered a massive bipolar outflow asso…
A Near-infrared Counterpart of 2E1613.5-5053: The Central Source in Supernova Remnant RCW103
Scholz, P.; Kaspi, V. M.; Tendulkar, S. P. +1 more
On 2016 June 22, 2E 1613.5-5053, the puzzling central compact object in supernova remnant RCW 103 emitted a magnetar-like burst. Using Director’s Discretionary Time, we observed 2E 1613.5-5053 with the Hubble Space Telescope (HST) (WFC3/IR) and we report here on the detection of a previously unseen infrared counterpart. In observations taken on 20…
Spectroscopic Evidence of Alfvén Wave Damping in the Off-limb Solar Corona
Gupta, G. R.
We investigate the off-limb active-region and quiet-Sun corona using spectroscopic data. The active region is clearly visible in several spectral lines formed in the temperature range of 1.1-2.8 MK. We derive the electron number density using the line ratio method, and the nonthermal velocity in the off-limb region up to the distance of 140 Mm. We…
Evidence for Spatially Correlated Gaia Parallax Errors in the Kepler Field
Huber, Daniel; Stello, Dennis; Pinsonneault, Marc H. +1 more
We present evidence for a spatially dependent systematic error in the first data release of Gaia parallaxes based on comparisons to asteroseismic parallaxes in the Kepler field and provide a parameterized model of the angular dependence of these systematics. We report an error of {0.059}-0.004+0.004 mas on scales of 0.°3, whi…