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53 papers · 2 filters
Parallaxes of Star Forming Regions in the Outer Spiral Arm of the Milky Way
K. Hachisuka, Y. K. Choi, M. J. Reid +4
We report parallaxes and proper motions of three water maser sources in high-mass star-forming regions in the Outer Spiral Arm of the Milky Way. The observations were conducted wit…
The X-Shaped Milky Way Bulge in OGLE-III Photometry and in N-Body Models
David M. Nataf, Andrzej Udalski, Jan Skowron +11
We model the split red clump of the Galactic bulge in OGLE-III photometry, and compare the results to predictions from two N-body models. Our analysis yields precise maps of the br…
The nature of obscuration in AGN: II. insights from clustering properties
Li Shao, Cheng Li, Guinevere Kauffmann +1
Based on large optical and mid-infrared (IR) surveys, we investigate the relation between nuclear activity in local Seyfert 2 galaxies and galaxy interactions using a statistical n…
Unshifted Metastable He I* Mini-Broad Absorption Line System in the Narrow Line Type 1 Quasar SDSS J080248.18551328.9
Tuo Ji, Hongyan Zhou, Peng Jiang +11
We report the identification of an unusual absorption line system in the quasar SDSS J080248.18551328.9 and present a detailed study of the system, incorporating follow-up optic…
Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
Kevin Bundy, Matthew A. Bershady, David R. Law +65
We present an overview of a new integral field spectroscopic survey called MaNGA (Mapping Nearby Galaxies at Apache Point Observatory), one of three core programs in the fourth-gen…
Compaction and Quenching of High-z Galaxies in Cosmological Simulations: Blue and Red Nuggets
Adi Zolotov, Avishai Dekel, Nir Mandelker +7
We use cosmological simulations to study a characteristic evolution pattern of high redshift galaxies. Early, stream-fed, highly perturbed, gas-rich discs undergo phases of dissipa…