Showing 2012 · astro-ph.GAShow all

48 papers · 2 filters

astro-ph.GA2012★ 7 cited

The structure and kinematics of dense gas in NGC 2068

S. L. Walker-Smith, J. S. Richer, J. V. Buckle +3

We have carried out a survey of the NGC 2068 region in the Orion B molecular cloud using HARP on the JCMT, in the 13CO and C18O (J = 3-2) and H13CO+ (J = 4-3) lines. We used 13CO t…

astro-ph.GA2012★ 125 cited

Elemental Abundances and their Implications for the Chemical Enrichment of the Boötes~I Ultra-Faint Galaxy

Gerard Gilmore, John E. Norris, Lorenzo Monaco +3

We present a double-blind analysis of high-dispersion spectra of seven red giant members of the Boötes I ultra-faint dwarf spheroidal galaxy, complemented with re-analysis of a sim…

astro-ph.GA2012★ 7 cited

Photometric study of open clusters Berkeley 96, Berkeley 97, King 12, NGC 7261, NGC 7296, and NGC 7788

Elena V. Glushkova, Marina V. Zabolotskikh, Sergey E. Koposov +4

The BVRcIc CCD photometry in the fields of six open clusters toward the Perseus spiral arm is presented. These data along with JHKs magnitudes taken from 2MASS catalog, have been u…

astro-ph.GA2012★ 217 cited

The Most Metal-Poor Stars. IV. The Two Populations With [Fe/H] < -3.0

John E. Norris, David Yong, M. S. Bessell +8

We discuss the carbon-normal and carbon-rich populations of Galactic halo stars having [Fe/H] < -3.0, utilizing chemical abundances from high-resolution, high-S/N model-atmosphere…

astro-ph.GA2012★ 244 cited

Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys

A. J. Drake, M. Catelan, S. G. Djorgovski +10

We present the analysis of 12227 type-ab RR Lyrae found among the 200 million public lightcurves in the Catalina Surveys Data Release 1 (CSDR1). These stars span the largest volume…

astro-ph.GA2012★ 45 cited

Young accreted globular clusters in the outer halo of M31

A. D. Mackey, A. P. Huxor, A. M. N. Ferguson +6

We report on Gemini/GMOS observations of two newly discovered globular clusters in the outskirts of M31. These objects, PAndAS-7 and PAndAS-8, lie at a galactocentric radius of ~87…

astro-ph.GA2012★ 106 cited

The extremely low-metallicity tail of the Sculptor dwarf spheroidal galaxy

Else Starkenburg, Vanessa Hill, Eline Tolstoy +10

We present abundances for seven stars in the (extremely) low-metallicity tail of the Sculptor dwarf spheroidal galaxy, from spectra taken with X-shooter on the ESO VLT. Targets wer…

astro-ph.GA2012★ 2 cited

The spectral energy distribution of protoplanetary diss around Massive Young Stellar Objects

Barbara Ercolano, Antonia Bevan, Thomas Robitaille

We investigate the effect of ionising radiation from Massive Young Stellar Objects impinging on their emerging spectral energy distribution. By means of detailed radiative transfer…

astro-ph.GA2012★ 49 cited

The JCMT Gould Belt Survey: SCUBA-2 observations of radiative feedback in NGC1333

J. Hatchell, T. Wilson, E. Drabek +5

We present observations of NGC1333 from SCUBA-2 on JCMT, observed as a JCMT Gould Belt Survey pilot project during the shared risk campaign when the first of four arrays was instal…

astro-ph.GA2012★ 186 cited

Broken and unbroken: the Milky Way and M31 stellar haloes

A. J. Deason, V. Belokurov, N. W. Evans +1

We use the Bullock & Johnston suite of simulations to study the density profiles of L*-type galaxy stellar haloes. Observations of the Milky Way and M31 stellar haloes show contras…

astro-ph.GA2012★ 35 cited

A statistical method for measuring the Galactic potential and testing gravity with cold tidal streams

Jorge Peñarrubia, Sergey E. Koposov, Matthew G. Walker

We introduce the Minimum Entropy Method, a simple statistical technique for constraining the Milky Way gravitational potential and simultaneously testing different gravity theories…

astro-ph.GA2012★ 86 cited

The nature of the interstellar medium of the starburst low-metallicity galaxy Haro11: a multi-phase model of the infrared emission

D. Cormier, V. Lebouteiller, S. C. Madden +15

(abridged) Our goal is to describe the multi-phase ISM of the IR bright low-metallicity galaxy Haro 11, dissecting the photoionised and photodissociated gas components. We present…

astro-ph.GA2012★ 40 cited

Thin disk kinematics from RAVE and the solar motion

S. Pasetto, E. K. Grebel, T. Zwitter +14

Aims. We study the Milky Way thin disk with the Radial Velocity Experiment (RAVE) survey. We consider the thin and thick disks as different Galactic components and present a techni…

astro-ph.GA2012★ 49 cited

Thick disk kinematics from RAVE and the solar motion

S. Pasetto, E. K. Grebel, T. Zwitter +14

Radial velocity surveys such as the Radial Velocity Experiment (RAVE) provide us with measurements of hundreds of thousands of nearby stars most of which belong to the Galactic thi…

astro-ph.GA2012★ 70 cited

Planck Intermediate Results. IX. Detection of the Galactic haze with Planck

Planck Collaboration, P. A. R. Ade, N. Aghanim +181

Using precise full-sky observations from Planck, and applying several methods of component separation, we identify and characterize the emission from the Galactic "haze" at microwa…

astro-ph.GA2012★ 3 cited

Investigating the source of Planck-detected AME: high resolution observations at 15 GHz

Yvette C. Perrott, Anna M. M. Scaife, Natasha Hurley-Walker +1

The Planck 28.5 GHz maps were searched for potential Anomalous Microwave Emission (AME) regions on the scale of or smaller, and several new regions of interest were…

astro-ph.GA2012★ 21 cited

A Deep, Wide-Field Study of Holmberg II with Suprime-Cam: Evidence for Ram Pressure Stripping

Edouard J. Bernard, Annette M. N. Ferguson, Michael K. Barker +3

We present a deep, wide-field optical study of the M81 group dwarf galaxy Holmberg II (HoII) based on Subaru/Suprime-Cam imaging. Individual stars are resolved down to I~25.2, i.e.…

astro-ph.GA2012★ 94 cited

A double cluster at the core of 30 Doradus

E. Sabbi, D. J. Lennon, M. Gieles +6

Based on an analysis of data obtained with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) we report the identification of two distinct stellar populations in th…

astro-ph.GA2012★ 75 cited

The VLT-FLAMES Tarantula Survey. VII. A low velocity dispersion for the young massive cluster R136

V. Hénault-Brunet, C. J. Evans, H. Sana +8

Detailed studies of resolved young massive star clusters are necessary to determine their dynamical state and evaluate the importance of gas expulsion and early cluster evolution.…

astro-ph.GA2012★ 60 cited

AMI Galactic Plane Survey at 16 GHz: I -- Observing, mapping and source extraction

AMI Consortium, :, Yvette C. Perrott +18

The AMI Galactic Plane Survey (AMIGPS) is a large area survey of the outer Galactic plane to provide arcminute resolution images at milli-Jansky sensitivity in the centimetre-wave…

astro-ph.GA2012★ 590 cited

Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve

David M. Nataf, Andrew Gould, Pascal Fouqué +11

We combine VI photometry from OGLE-III with VVV and 2MASS measurements of E(J-K_{s}) to resolve the longstanding problem of the non-standard optical extinction toward the Galactic…

astro-ph.GA2012★ 61 cited

The VLT-FLAMES Tarantula Survey VI: Evidence for rotation of the young massive cluster R136

V. Hénault-Brunet, M. Gieles, C. J. Evans +8

Although it has important ramifications for both the formation of star clusters and their subsequent dynamical evolution, rotation remains a largely unexplored characteristic of yo…

astro-ph.GA2012★ 242 cited

The coupling between the core/cusp and missing satellite problems

Jorge Peñarrubia, Andrew Pontzen, Matthew G. Walker +1

We calculate the energy that baryons must inject in cold dark matter (CDM) haloes in order to remove centrally-divergent DM cusps on scales relevant to observations of dwarf sphero…

astro-ph.GA2012★ 49 cited

Do all stars in the solar neighbourhood form in clusters? A cautionary note on the use of the distribution of surface densities

Mark Gieles, Nick Moeckel, Cathie J. Clarke

Bressert et al. recently showed that the surface density distribution of low-mass, young stellar objects (YSOs) in the solar neighbourhood is approximately log-normal. The authors…