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Evidence for Expanding Superbubbles in a Galaxy at z=0.7443
Vogt, Steven S.; Charlton, Jane C.; Churchill, Christopher W. +1 more
The intervening z=0.7443 Mg II absorption system in the spectrum of MC 1331+170 shows an unusual series of line pairs, each with Δv~30 km s-1. These lines could be explained as the shells of expanding superbubbles residing in the outer regions of an edge-on spiral galaxy visible in the optical image of the MC 1331+170 field. The color a…
Multicolor Observations of the Hubble Deep Field South
Fontana, Adriano; Grazian, Andrea; Bianchi, Simone +6 more
We present a deep multicolor (U, B, V, I, Js, H, Ks) catalog of galaxies in the Hubble Deep Field South, based on observations obtained with the HST WFPC2 in 1998 and VLT-ISAAC in 1999. The photometric procedures were tuned to derive a catalog optimized for the estimation of photometric redshifts. In particular we adopted a ``conservative'' detect…
Multicolor photometry of the Vela pulsar
Caraveo, P. A.; Mignani, R. P.
Multicolor photometry of the Vela pulsar (PSR B0833-45), updated by recent HST/WFPC2 observations obtained in the 555W, 675W and 814W filters, is presented. The available data provide the best characterization so far of the pulsar spectral shape, which is dominated by a flat power law continuum with spectral index alpha = -0.2 +/- 0.2, consistent …
Evolution of the dust mass loss with luminosity along the giant branch of the globular cluster 47 Tucanae
Jorissen, A.; Ramdani, A.
The present paper investigates the properties of the dust mass loss in stars populating the giant branch of the globular cluster 47 Tuc, by combining ISOCAM and DENIS data. Raster maps of 5 fields covering areas ranging from 4x4 to 15x15 arcmin2 at different distances from the center of the cluster have been obtained with ISOCAM at 11.5…
Compact Star Clusters in M81. I. Data from Hubble Space Telescope Wide Field Planetary Camera 2 Imaging
Chandar, Rupali; Ford, Holland C.; Tsvetanov, Zlatan
In this paper, we present the discovery of 114 compact star clusters in the nearby spiral galaxy M81 from B-, V-, and I-band Hubble Space Telescope Wide Field Planetary Camera 2 imaging in eight fields, covering a total area of ~40 arcmin2. The fields sample a variety of environments (both spiral and interarm regions), as well as a rang…
The galactic mass injection from cool stellar winds of the 1 to 2.5 Msun stars in the solar neighbourhood
Schröder, K. -P.; Sedlmayr, E.
We have computed synthetic stellar samples and HR diagrams on the basis of a fine-meshed, consistent grid of evolution tracks for given IMF and SFR(t). In order to model the galactic disk stellar component (single stars only) and to derive its IMF and apparent SFR(t), we selected the synthetic sample which is the best fit to the observed distribut…
A far infrared view of low mass star formation in the Cederblad 110 nebula of Chamaeleon I
Lemke, D.; Lehtinen, K.; Mattila, K. +1 more
The Cederblad 110 reflection nebula contains several young stellar objects previously discovered by IRAS and sub-mm observations. This cluster was revisited with ISO's FIR cameras and mapped with higher spatial resolution. All sources were also mapped for the first time near the maximum of their spectral energy distribution at 200 mu m. In additio…
The structure of the Akn 120 emitting region: The line shapes and long-term Hβ line profile variation
Bon, E.; Stanić, N.; Kubičela, A. +1 more
To investigate the structure of the Akn 120 emitting region we have analysed the spectral line profiles of Halpha, Hbeta, Lyalpha, C III[1909], C IV[1549] and Mg II[2798] lines using a Gaussian-decomposition approach. The decomposed shape of the Akn 120 lines indicates three separated broad line-emitting regions, i…
Measuring Sizes of Marginally Resolved Young Globular Clusters with the Hubble Space Telescope
Holtzman, Jon A.; Carlson, Matthew N.
We present a method for deriving sizes of marginally resolved star clusters from Hubble Space Telescope/WFPC2 observations by fitting King models to observations. We describe results both on simulated images and on observations of young compact clusters in NGC 3597 and NGC 1275. From the simulations, we find that we can measure King model concentr…
EUV Sprays: Jet-like eruptive activity on the solar limb
Harrison, R. A.; Bryans, P.; Bingham, R.
Jet-like eruptive events have been detected in the extreme ultraviolet (EUV) observations from the Solar and Heliospheric Observatory (SOHO) spacecraft. Some jet-like events are shown and for one event, that of January 22 2000, we provide a detailed analysis of the EUV observations. The January 22 observation was part of an on-going campaign to ob…