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The Hubble Legacy Archive NICMOS Grism Data
Wolfram Freudling, Martin Kümmel, Jonas Haase +6
The Hubble Legacy Archive (HLA) aims to create calibrated science data from the Hubble Space Telescope archive and make them accessible via user-friendly and Virtual Observatory (V…
Spectroscopic Confirmation of Faint Lyman Break Galaxies at Redshifts Four and Five in the Hubble Ultra Deep Field
James E. Rhoads, Sangeeta Malhotra, Norbert Pirzkal +6
We present the faintest spectroscopically confirmed sample of redshift four and five Lyman break galaxies to date. The sample is based on slitless grism spectra of the Hubble Ultra…
Integral field spectroscopy of protoplanetary disks in Orion with VLT FLAMES
Y. G. Tsamis, J. R. Walsh, D. Péquignot
We discuss integral field spectroscopy of proplyds in M42 using the FLAMES Argus unit and report the first detection of recombination lines of C II and O II from the archetypical L…
Emission-Line Galaxies from the PEARS Hubble Ultra Deep Field: A 2-D Detection Method and First Results
Amber N. Straughn, Gerhardt R. Meurer, Norbert Pirzkal +11
The Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) grism PEARS (Probing Evolution And Reionization Spectroscopically) survey provides a large dataset of low-resolut…
Integral field spectroscopy of planetary nebulae: mapping the line diagnostics and hydrogen-poor zones with VLT FLAMES
Y. G. Tsamis, J. R. Walsh, D. Péquignot +3
(Abridged) Results from the first dedicated study of Galactic PNe by means of optical integral field spectroscopy with the VLT FLAMES Argus IFU are presented. Three typical Galacti…
Automated selection and characterization of emission-line sources in ACS WFC grism data
Gerhardt R. Meurer, Z. I. Tsvetanov, C. Gronwall +10
We present complimentary techniques to find emission-line targets and measure their properties in a semi-automated fashion from grism observations obtained with the Advanced Camera…
The Planetary Nebula population of the Sagittarius Dwarf Spheroidal Galaxy
Albert Zijlstra, K. Gesicki, J. R. Walsh +3
The identification of two new Planetary Nebulae in the Sagittarius Dwarf Spheroidal Galaxy (Sgr) is presented. This brings the total number to four. The first, StWr 2-21, belongs t…
Slitless spectroscopy with the Advanced Camera for Surveys
M. Kuemmel, S. S. Larsen, J. R. Walsh
The Advanced Camera for Surveys (ACS) enables low resolution slitless spectroscopic imaging in the three channels. The most-used modes are grism imaging with the WFC and the HRC at…
Calibration of ACS Prism Slitless Spectroscopy Modes
S. S. Larsen, M. Kuemmel, J. R. Walsh
The Advanced Camera for Surveys is equipped with three prisms in the Solar Blind (SBC) and High Resolution (HRC) Channels, which together cover the 1150 - 3500 A range, albeit at h…
Recent developments of the ACS spectral extraction software aXe
J. R. Walsh, M. Kuemmel, S. S. Larsen
The software package aXe provides comprehensive spectral extraction facilities for all the slitless modes of the ACS, covering the Wide Field Channel (WFC) grism, the High Resoluti…
Slitless grism spectroscopy with the HST Advanced Camera for Surveys
A. Pasquali, N. Pirzkal, S. Larsen +2
The Advanced Camera for Surveys on-board HST is equipped with a set of one grism and three prisms for low-resolution, slitless spectroscopy in the range 1150 Ang. to 10500 Ang. The…
Extracting clean supernova spectra
S. Blondin, J. R. Walsh, B. Leibundgut +1
We use a new technique to extract the spectrum of a supernova from that of the contaminating background of its host galaxy, and apply it to the specific case of high-redshift Type…
A Redshift z=5.4 Lyman alpha Emitting Galaxy with Linear Morphology in the GRAPES/UDF Field
James E. Rhoads, Nino Panagia, Rogier A. Windhorst +21
We have discovered an extended Lyman alpha plume associated with a compact source at redshift 5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Scienc…
Angular diameters, fluxes and extinction of compact planetary nebulae: further evidence for steeper extinction towards the Bulge
P. M. E. Ruffle, A. A. Zijlstra, J. R. Walsh +5
We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow band filters. Angular diameters are derived using constant emiss…
Discovery of a Solitaire Dwarf Galaxy in the APPLES Survey
A. Pasquali, S. Larsen, I. Ferreras +5
During the APPLES parallel campaign, the HST Advanced Camera for Surveys has resolved a distant stellar system, which appears to be an isolated dwarf galaxy. It is characterized by…
The Local Group Census: planetary nebulae in IC 10, Leo A and Sextans A
L. Magrini, R. L. M. Corradi, R. Greimel +8
In the framework of our narrow-band survey of the Local Group galaxies, we present the results of the search for planetary nebulae (PNe) in the dwarf irregular galaxies IC10, LeoA…
Iterative techniques for the decomposition of long-slit spectra
L. B. Lucy, J. R. Walsh
Two iterative techniques are described for decomposing a long-slit spectrum into the individual spectra of the point sources along the slit and the spectrum of the underlying backg…
Flat-fielding of ACS WFC grism data
N. Pirzkal, A. Pasquali, J. Walsh
In direct imaging, broad band flat-fields can easily be applied to correct deviation from uniform sensitivity across the detector field. However for slitless spectroscopy data the…
The Wavelength Calibration of the WFC grism
A. Pasquali, N. Pirzkal, J. R. Walsh
We present the wavelength solution derived for the G800L grism with the Wide Field Channel from the spectra of two Galactic Wolf-Rayet stars, WR 45 and WR 96. The data were acquire…
High Resolution CO and H2 Molecular Line Imaging of a Cometary Globule in the Helix Nebula
P. J. Huggins, T. Forveille, R. Bachiller +3
We report high resolution imaging of a prominent cometary globule in the Helix nebula in the CO J=1-0 (2.6 mm) and H2 v=1-0 S(1) (2.12 micron) lines. The observations confirm that…
A radio-continuum and photoionization-model study of the two planetary nebulae in the Sagittarius dwarf galaxy
G. Dudziak, D. Pequignot, A. A. Zijlstra +1
Radio continuum observations at 1.4, 4.8 and 8.6 GHz of the two Planetary Nebulae (PNe) in the Sagittarius dwarf galaxy reveal the elongated shape of Wray 16-423 and the extreme co…
High resolution Ks polarization mapping of OH 231.8+4.2 (OH 0739-14) with SOFI
N. Ageorges, J. R. Walsh
The bipolar reflection nebula OH 231.8+4.2 (OH 0739-14), centred on the Mira variable star QX Pup, has been mapped at Ks in linear polarization using the ESO SOFI near-infrared mul…
High resolution near-infrared polarimetry of Eta Carinae and the Homunculus Nebula
J. R. Walsh, N. Ageorges
High resolution near-infrared adaptive optics imaging and polarimetry have been obtained of the Homunculus Nebula and its central star Eta Carinae (HD 93308). Maps of the linear po…
A continuous low star formation rate in IZw 18 ?
F. Legrand, D. Kunth, J. -R. Roy +2
Deep long-slit spectroscopic observations of the blue compact galaxy IZw 18 obtained with the CFH 3.6 m Telescope are presented. The very low value of oxygen abundance previously r…