126 citations · 2k across the 63 of their papers we have counts for
14 papers · 1 filter
Detectors for the James Webb Space Telescope Near-Infrared Spectrograph I: Readout Mode, Noise Model, and Calibration Considerations
Bernard J. Rauscher, Ori Fox, Pierre Ferruit
We describe how the James Webb Space Telescope (JWST) Near-Infrared Spectrograph's (NIRSpec's) detectors will be read out, and present a model of how noise scales with the number o…
A Hubble View of Star Forming Regions in the Magellanic Clouds
D. A. Gouliermis, Th. Henning, W. Brandner +13
The Magellanic Clouds (MCs) offer an outstanding variety of young stellar associations, in which large samples of low-mass stars (with masses less than 1 solar mass) currently in t…
Stellar populations in the Magellanic Clouds: looking through the dust
Guido De Marchi, Nino Panagia, Martino Romaniello
We present the first results of our study of stellar populations in the Large and Small Magellanic Clouds based on multi-band WFPC2 observations of "random" fields taken as part of…
The stellar IMF of Galactic clusters and its evolution
Guido De Marchi, Francesco Paresce, Simon Portegies Zwart
We show that one can obtain a good fit to the measured main sequence mass function (MF) of a large sample of Galactic clusters (young and old) with a tapered Salpeter power law dis…
The Spatially-Resolved Mass Function of the Globular Cluster M22
Michael D. Albrow, Guido De Marchi, Kailash C. Sahu
HST imaging of M22 has allowed, for the first time, a detailed and uniform mapping of mass segregation in a globular cluster. Luminosity and mass functions from the turnoff down to…
On the accuracy of the S/N estimates obtained with the exposure time calculator of the Wide Field Planetary Camera 2 on board the Hubble Space Telescope
G. Li Causi, G. De Marchi, F. Paresce
We have studied the accuracy and reliability of the exposure time calculator (ETC) of the Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST) with the o…
Detection of a Thick Disk in the edge-on Low Surface Brightness Galaxy ESO 342-G017: I. VLT Photometry in V and R Bands
Mark J. Neeser, Penny D. Sackett, Guido De Marchi +1
We report the detection of a thick disk in the edge-on, low surface brightness (LSB), late-type spiral ESO 342-G017, based on ultra-deep images in the V and R bands obtained with t…
VLT observations of the peculiar globular cluster NGC 6712, II: luminosity and mass functions
G. Andreuzzi, G. De Marchi, F. Ferraro +3
We have carried out extensive VLT-FORS1 observations covering a fair fraction of the intermediate metallicity globular cluster NGC 6712 in the V and R bands. We derive accurate col…
VLT Observations of the Peculiar Globular Cluster NGC6712, III: The Evolved Stellar Population
Barbara Paltrinieri, Francesco R. Ferraro, Francesco Paresce +1
We present extensive UBVR photometry of the Galactic globular cluster (GGC) NGC6712 obtained with the ESO Very Large Telescope (VLT) which reach down to two magnitudes below the ma…
Very Large Telescope Observations of the peculiar globular cluster NGC6712. Discovery of a UV, H-alpha excess star in the core
Francesco R. Ferraro, Barbara Paltrinieri, Francesco Paresce +1
We present results from multi-band observations in the central region of the cluster NGC6712 with the ESO-Very Large Telescope. Using high resolution images we have identified thre…
The Low End of the Initial Mass Function in Young LMC Clusters: I. The Case of R136
Marco Sirianni, Antonella Nota, Claus Leitherer +2
We report the result of a study in which we have used very deep broadband V and I WFPC2 images of the R136 cluster in the Large Magellanic Cloud from the HST archive, to sample the…
The Mass Function of Main Sequence Stars in NGC6397 from Near IR and Optical High Resolution HST Observations
Guido De Marchi, Francesco Paresce, Luigi Pulone
We have investigated the properties of the stellar mass function in the globular cluster NGC6397 using a large set of HST observations that include WFPC2 images in V and I, obtaine…
The Luminosity Function of Omega Centauri
Guido De Marchi
Deep HST-WFPC2 observations of the stellar population in the globular cluster Omega Cen (NGC 5139) have been used to measure the luminosity function of main sequence stars at the l…
The Resolved Stellar Population of the Post-Starburst Galaxy NGC 1569
L. Greggio, M. Tosi, M. Clampin +4
We present WFPC2-HST photometry (in the F439W and F555W bands) of the resolved stars in NGC 1569. The derived color-magnitude diagram (CMD) contains 2800 objects down to the 26th m…