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-A (FUV-V),V color absolute-magnitude diagram for Abell 2246 (filled circles) and well-known local objects (open circles, labeled). All observations have been corrected for Galactic foreground extinction. (Note that while the color error bars from Table 4 are a large fraction of the plot's color scale, the plot's entire range covers only the colors of stellar spectral types B9 through early A, showing the leverage of the FUV bandpass in this spectral range.) Without redshift corrections, the observed cluster galaxies have FUV colors and magnitudes which lie within the range covered by local objects. Redshiftcorrection vectors for template spectra of Sa and Sb galaxies (averaged), starbursts with a range of internal reddenings (averaged), and Sc galaxies are also shown; appropriate redshift corrections are evidently significant. The vectors are intended to show displacements only; their locations are arbitrary.
Source publication
We present deep ultraviolet observations of a field containing the cluster Abell 2246 (z = 0.225), which provide far-ultraviolet (FUV) images of some of the faintest galaxies yet observed in that bandpass. Abell 2246 lies within the field of view of Ultraviolet Imaging Telescope (UIT) observations of the quasar HS 1700+64, which accumulated over 71...
Contexts in source publication
Context 1
... they appear non-stellar on the V-and I-band images, with sizes corresponding to linear extents of a few tens of kpc at z=0.225. Second, their foreground-and redshift- corrected (FUV-V) colors, in the range -0.36 to +0.49, are similar to those of well-known local, bright star-forming galaxies (see Figure 3 and Table 4, where derived FUV absolute magnitudes, UV colors, and star formation rates for these five galaxies are presented.). Third, their UV luminosities, if they are at the Abell 2246 distance, are approximately those of nearby UV-luminous galaxies. ...
Context 2
... the extinction law of Cardelli, Clayton, and Mathis 1988) in the range from - 21.4 to -20.4 (Table 4). A (FUV-V), FUV color mag- nitude diagram for Abell 2246 galaxies and well-known local objects (Fanelli et al. 1998) is shown in Figure 3. In this and subsequent plots all observations have been cor- rected for Galactic foreground extinction. ...
Context 3
... vectors are intended to show displacements only; their lo- cations are arbitrary. of NGC2993. Figure 5 compares the (MUV-V,FUV-V) colors with data from the individual template galaxy and population spectra of Kinney et al. 1996, also shown as averages in Figure 3. (This Figure has error bars appropriate for Fig- ures 4,5, and 6). ...
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Citations
The first UV F300W and F218W WFPC2 observations of the rich galaxy cluster CL 0939+4713 at z = 0.41 are presented and discussed. UV/optical two-color and color-magnitude diagrams of the sources detected in the F300W waveband are constructed. Thanks to preexisting Hubble Space Telescope (HST) optical images of the same field, a morphological classification for the majority of these objects is also provided. Moreover, taking advantage of recent redshift surveys along the CL 0939+4713 line of sight, separate diagrams comparing the properties of galaxies belonging to the cluster and to its close projected field are presented. Possible evolutionary effects in the UV from z ~ 0.4 to the present time are investigated by comparing the rest-frame (mid-UV/optical) colors of galaxies in CL 0939+4713 with balloon-borne data of the Coma Cluster, as well as by resorting to suitable galaxy evolution models. Finally, current attempts to constrain the epoch of the UV-upturn onset in evolved populations by means of HST UV observations are discussed.
