2,982 datasets found

Understanding how star formation begins and propagates through molecular clouds is a fundamental but still open question. One major difficulty in addressing this question is the...

We provide a census of the apparent stellar angular momentum within one effective radius of a volume-limited sample of 260 early-type galaxies (ETGs) in the nearby Universe,...

We present a multiwavelength study of the poor cluster RX J1117.4+0743 ([VMF98] 097) at z=0.485, based on GMOS/Gemini South g' and r' photometry and spectroscopy, and XMM-Newton...

We present a wide-field (4.5deg^2^) photometric and spectroscopic survey of the Leo I dwarf spheroidal (dSph) galaxy to explore its extended morphology and dynamics. To select...

Hypervelocity stars (HVSs) are stars ejected completely out of the Milky Way by three-body interactions with the massive black hole in the Galactic center. We describe 643 new...

Using the Sloan Digital Sky Survey (SDSS), we probe the halo mass distribution by studying the velocities of satellites orbiting isolated galaxies. In a subsample that covers...

We present evidence for a ring of stars in the plane of the Milky Way, extending at least from l=180{deg} to 227{deg} with turnoff magnitude g~19.5; the ring could encircle the...

We present the results of a deep and uniform narrowband H{alpha} imaging survey for planetary nebulae (PNs) in the southern Galactic bulge. In our survey, we have found 56 new...

HD 3167 is a bright (V=8.9), nearby K0 star observed by the NASA K2 mission (EPIC 220383386), hosting two small, short-period transiting planets. Here we present the results of...

We present a new insight on NGC 6034 and UGC 842, two groups of galaxies previously reported in the literature as being fossil groups. The study is based on optical photometry...

We derive the number of dynamically close companions per galaxy (N_c_) and their total luminosity (L_c_) for galaxies in the Millennium Galaxy Catalogue (MGC, 2003, Cat. ). N_c_...

The results of a wide-field survey of the Sculptor dwarf spheroidal galaxy are presented. Our aims were to obtain an accurate map of the outer structure of Sculptor and to...

This paper is part of a series that focuses on investigating galaxy formation and evolution in small-scale systems of galaxies in low-density environments. We present results...

We apply a friends-of-friends algorithm to the combined Updated Zwicky Catalog (UZC, Cat. )and Southern Sky Redshift Survey (SSRS2, Cat. ) to construct a catalog of 1168 groups...

Stellar rotation curves, velocity dispersion profiles, and line of sight velocity distributions (LOSVD) as derived from absorption-lines are presented for the major axes of 18...

The Sagittarius dwarf spheroidal galaxy, the closest satellite galaxy of the Milky Way, has survived for many orbits about the Galaxy. Extent numerical calculations modeled this...

Observational parameters which can be used for redshift-independent distance determination using the Tully-Fisher (TF) technique are given for 782 spiral galaxies in the fields...

We present 387 velocities covering an area 1.8x1.8{deg}^2^, including 229 new galaxy velocities obtained from 309 spectra, of which 317 appear to be cluster members according to...

Multi-planet systems are important sources of information regarding the evolution of planets. However, the long-period planets in these systems often escape detection. These...

Much remains to be understood about the nature of exoplanets smaller than Neptune, most of which have been discovered in compact multi-planet systems. With its inner ultra-short...