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A historic jet-emission minimum reveals hidden spectral features in 3C 273
Lähteenmäki, A.; Foellmi, C.; O'Brien, P. T. +14 more
Aims. The aim of this work is to identify and study spectral features in the quasar 3C 273 usually blended by its strong jet emission.
Methods: . A historic minimum in the sub-millimetre emission of 3C 273 triggered coordinated multi-wavelength observations in June 2004. X-ray observations from the INTEGRAL, XMM-Newton and RXTE satellites are…
Deep HST Photometry of NGC 6388: Age and Horizontal-Branch Luminosity
Kinemuchi, Karen; Rich, R. M.; Catelan, M. +5 more
Using the Hubble Space Telescope, we have obtained the first color-magnitude diagram (CMD) to reach the main-sequence turnoff of the Galactic globular cluster NGC 6388. From a comparison between the cluster CMD and that of 47 Tucanae, we find that the bulk of the stars in these two clusters have nearly the same age and chemical composition. On the…
The star formation rate at redshift one: Hα spectroscopy with CIRPASS
Bunker, Andrew; Sharp, Robert; Dalton, Gavin +3 more
We have conducted an Hα survey of 38 0.77 <= z <= 1 galaxies over ~100arcmin2 of the Hubble Deep Field-North and Flanking Fields, to determine star formation rates (SFRs), with the near-IR multi-object spectrograph Cambridge Infrared Panoramic Survey Spectrograph (CIRPASS) on the William Herschel Telescope (WHT). This represents t…
New southern blue compact dwarf galaxies in the 2dF Galaxy redshift survey
Thuan, T. X.; Izotov, Y. I.; Papaderos, P. +3 more
Aims.Aiming to find new extremely metal-deficient star-forming galaxies we extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) 100 K Data Release 14 emission-line galaxies with relatively strong [O iii] λ4363 emission.
Methods: .Spectroscopic and photometric studies of this sample and, in addition, of 7 Tololo and 2 UM galaxies…
Spectral Irradiance Calibration in the Infrared. XVI. Improved Accuracy in the Infrared Spectra of the Secondary and Tertiary Standard Calibration Stars
Kraemer, Kathleen E.; Price, Stephan D.; Engelke, Charles W.
We have increased the spectral resolution and accuracy of the absolute infrared spectral flux for a subset of stellar standards created by Cohen and his collaborators in previous papers in this series. We combined the moderate-resolution (λ/Δλ~400) spectroscopy obtained on infrared standard stars by the Short Wavelength Spectrometer on the Infrare…
Strange magnification pattern in the large separation lens SDSS J1004+4112 from optical to X-rays
Christensen, L.; Schwope, A.; Wisotzki, L. +1 more
We present simultaneous XMM-Newton UV and X-ray observations of the quadruply lensed quasar
Simple Magnetic Flux Balance as an Indicator of Ne VIII Doppler Velocity Partitioning in an Equatorial Coronal Hole
McIntosh, Scott W.; Davey, Alisdair R.; Hassler, Donald M.
We present a novel investigation into the relationship between simple estimates of magnetic flux balance and the Ne VIII Doppler velocity partitioning of a large equatorial coronal hole observed by the Solar Ultraviolet Measurements of Emitted Radiation spectrometer (SUMER) on the Solar and Heliospheric Observatory in 1999 November. We demonstrate…
Hard X-ray bursts detected by the IBIS telescope onboard the INTEGRAL observatory in 2003 2004
Sunyaev, R. A.; Grebenev, S. A.; Chelovekov, I. V.
All of the observations performed with the IBIS telescope onboard the INTEGRAL observatory during the first one and a half years of its in-orbit operation (from February 10, 2003, through July 2, 2004) have been analyzed to find X-ray bursts. The time history of the IBIS/ISGRI total count rate in the energy range 15-25 keV revealed 1077 bursts of …
Testing Rotational Mixing Predictions with New Boron Abundances in Main-Sequence B-Type Stars
Lambert, D. L.; Mendel, J. T.; Venn, K. A. +2 more
New boron abundances for seven main-sequence B-type stars are determined from HST STIS spectroscopy around the B III 2066 Å line. Boron abundances provide a unique and critical test of stellar evolution models that include rotational mixing, since boron is destroyed in the surface layers of stars through shallow mixing long before other elements a…
The Water Vapor Abundance in Orion KL Outflows
Cernicharo, José; Viti, Serena; Barlow, Michael J. +7 more
We present the detection and modeling of more than 70 far-IR pure rotational lines of water vapor, including the 18O and 17O isotopologues, toward Orion KL. Observations were performed with the Long Wavelength Spectrometer in Fabry-Pérot mode (λ/Δλ~6800-9700) on board the Infrared Space Observatory between ~43 and 197 µ…