Search Publications
Prevalence of neutral gas in centres of merging galaxies
Srianand, R.; Gupta, N.; Dutta, R.
We present Giant Metrewave Radio Telescope and Very Large Array observations of H I 21-cm absorption in 10 z ≤ 0.2 galaxy mergers that host strong radio sources. Seven of these mergers show strong absorption [with N({H I}) ∼ 1021 - 22 cm-2, for spin temperature of 100 K and unit covering factor]. Including literature sources,…
The Hercules stream as seen by APOGEE-2 South
Bizyaev, Dmitry; Bovy, Jo; Pan, Kaike +15 more
The Hercules stream is a group of comoving stars in the solar neighbourhood, which can potentially be explained as a signature of either the outer Lindblad resonance (OLR) of a fast Galactic bar or the corotation resonance (CR) of a slower bar. In either case, the feature should be present over a large area of the disc. With the recent commissioni…
Massive stars in the hinterland of the young cluster, Westerlund 2
Monguió, M.; Herrero, A.; Wright, N. J. +4 more
An unsettled question concerning the formation and distribution of massive stars is whether they must be born in massive clusters and, if found in less dense environments, whether they must have migrated there. With the advent of wide-area digital photometric surveys, it is now possible to identify massive stars away from prominent Galactic cluste…
The Type I Superluminous Supernova PS16aqv: Lightcurve Complexity and Deep Limits on Radioactive Ejecta in a Fast Event
Berger, E.; Chornock, R.; Fong, W. +6 more
We present UV/optical observations of PS16aqv (SN 2016ard), a fast-evolving Type I superluminous supernova (SLSN-I) that reached a peak absolute magnitude of M r ≈ -22.1. The lightcurves exhibit a significant undulation at 30 rest-frame days after peak, with a behavior similar to undulations seen in the slowly fading SLSN-I SN 2015bn.…
Constraints on Cosmological Parameters from the Angular Power Spectrum of a Combined 2500 deg2 SPT-SZ and Planck Gravitational Lensing Map
Bleem, L. E.; Stark, A. A.; George, E. M. +44 more
We report constraints on cosmological parameters from the angular power spectrum of a cosmic microwave background (CMB) gravitational lensing potential map created using temperature data from 2500 deg2 of South Pole Telescope (SPT) data supplemented with data from Planck in the same sky region, with the statistical power in the combined…
Forecasting the Contribution of Polarized Extragalactic Radio Sources in CMB Observations
Baccigalupi, C.; Bonavera, L.; Danese, L. +7 more
We combine the latest data sets obtained with different surveys to study the frequency dependence of polarized emission coming from extragalactic radio sources (ERS). We consider data over a very wide frequency range starting from 1.4 GHz up to 217 GHz. This range is particularly interesting since it overlaps the frequencies of the current and for…
Boötes III is a Disrupting Dwarf Galaxy Associated with the Styx Stellar Stream
Sand, D. J.; Carlin, Jeffrey L.
We present proper motion (PM) measurements of Boötes III, an enigmatic stellar satellite of the Milky Way (MW), utilizing data from the second data release of the Gaia mission. By selecting 15 radial velocity confirmed members of Boötes III, along with a likely RR Lyrae member in the vicinity, we measure an error-weighted mean PM of (µ …
HST Follow-up Observations of Two Bright z ∼ 8 Candidate Galaxies from the BoRG Pure-parallel Survey
Treu, T.; Mason, C. A.; Trenti, M. +4 more
We present follow-up imaging of two bright (L > L*) galaxy candidates at z ≳ 8 from the Brightest of Reionizing Galaxies (BoRG) survey with the F098M filter on the Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). The F098M filter provides an additional constraint on the flux blueward of the spectral break, and the observations are designe…
On deviations from free-radial outflow in the inner coma of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +44 more
The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) onboard the European Space Agency's Rosetta spacecraft acquired images of comet 67P/Churyumov-Gerasimenko (67P) and its surrounding dust coma starting from May 2014 until September 2016. In this paper we present methods and results from analysis of OSIRIS images regarding the …
The Transition from Young to Middle-aged Supernova Remnants: Thermal and Nonthermal Aspects of SNR N132D
Miller, Eric D.; Katsuda, Satoru; Terada, Yukikatsu +8 more
Supernova remnants (SNRs) are the primary candidate of Galactic cosmic-ray accelerators. It is still an open issue when and how young SNRs, which typically exhibit strong synchrotron X-rays and GeV and TeV gamma rays, undergo the state transition to middle-aged SNRs dominated by thermal X-rays and GeV gamma rays. SNR N132D in the Large Magellanic …