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20022009
most citedThe Milky Way's Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from Kinematics of ~2400 SDSS Blue Horizontal Branch Stars

736 citations

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5 papers · 1 filter

astro-ph.GA2009★ 128 cited

The orbits of open clusters in the Galaxy

Zhen-Yu Wu, Xu Zhou, Jun Ma +1

We present and analyze kinematics and orbits for a sample of 488 open clusters in the Galaxy. The velocity ellipsoid for our present sample is derived as (, , $σ_{W})…

astro-ph.GA2009★ 62 cited

Eddington ratio governs the equivalent width of MgII emission line in active galactic nuclei

Xiao-Bo Dong, Ting-Gui Wang, Jian-Guo Wang +4

We have investigated the ensemble regularities of the equivalent widths (EWs) of MgII 2800 emission line of active galactic nuclei (AGNs), using a uniformly selected sample of 2092…

astro-ph.GA2009★ 53 cited

Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors

Z. H. Zhang, R. S. Pokorny, H. R. A. Jones +6

Aims. We try to identify ultra-cool dwarfs from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with SDSS i-z and r-z colors. We also obtain proper motion data…

astro-ph.GA2009★ 87 cited

NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?

S. Komossa, H. Zhou, A. Rau +9

The galaxy SDSSJ0952+2143 showed remarkable emission-line properties first reported in 2008 (paper I), which are the consequence of a powerful high-energy flare. Here we report fol…

astro-ph.GA2009★ 70 cited

An Orbit Fit for the Grillmair Dionatos Cold Stellar Stream

Benjamin A. Willett, Heidi Jo Newberg, Haotong Zhang +2

We use velocity and metallicity information from SDSS and SEGUE stellar spectroscopy to fit an orbit to the narrow stellar stream of Grillmair and Dionatos. The stars in…