Search Publications
Discovery of a Very Bright and Intrinsically Very Luminous, Strongly Lensed Lyα Emitting Galaxy at z = 2.82 in the BOSS Emission-Line Lens Survey
Brownstein, Joel R.; Marques-Chaves, Rui; Oguri, Masamune +9 more
We report the discovery of a very bright (r = 20.16), highly magnified, and yet intrinsically very luminous Lyα emitter (LAE) at z=2.82. This system comprises four images in the observer plane with a maximum separation of ∼ 6\prime\prime and it is lensed by a z=0.55 massive early-type galaxy. It was initially identified in the Baryon Os…
Test of Weak Equivalence Principle with the Multi-band Timing of the Crab Pulsar
Zhang, Yueyang; Gong, Biping
The Weak Equivalent Principle (WEP) can be tested through the parameterized post-Newtonian parameter γ, representing the space curvature produced by unit rest mass. The parameter γ in turn has been constrained by comparing the arrival times of photons originating in distant transient events, such as gamma-ray bursts, fast radio bursts, and giant p…
Evolution of Molecular Clouds in the Superwind Galaxy NGC 1808 Probed by ALMA Observations
Salak, Dragan; Tomiyasu, Yuto; Nakai, Naomasa +3 more
ALMA imaging of the cold molecular medium in the nearby starburst galaxy NGC 1808 is presented. The observations reveal the distribution of molecular gas, traced by 12CO (1-0) and 12CO (3-2), and continuum (93 and 350 GHz) across the central 1 kpc starburst region at a high resolution of ∼ 1\prime\prime . A molecul…
Herschel Spectroscopy of Early-type Galaxies
Young, Lisa M.; Crocker, Alison; Lapham, Ryen Carl
We present Herschel spectroscopy of atomic lines arising in photodissociation regions as well as ionization regions of nearby early-type galaxies (ETGs), focusing on the volume-limited Atlas3D sample. Our data include the [C II], [O I], and [N II] 122 and 205 µm lines, along with ancillary data including CO and H I maps. We find that ETGs ha…
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…