UV Imaging to Determine the Location of Residual Star Formation in Galaxies Recently Arrived on the Red Sequence

The Bright Object Tool in its current form is not very useful for planning ACS/SBC observations. There are many objects with V-band magnitude such that, if they are assumed to be O5V stars and extrapolated to the far UV, they would violate the bright object limit for the SBC detector. Of course, the number that are in fact O stars is very small. Worse, there are objects with substantial FUV fluxes that are too weak in V to be flagged by the BOT. All of the bright sources I identified in planning this Phase II proposal were discovered by examining the GALEX FUV images and photometric catalogs. As the GALEX all-sky survey data becomes available, this should be incorporated into the tool. The GALEX FUV imaging gives a much better sense of which objects have strong FUV fluxes than the DSS. Including GALEX would make the BOT very useful, while in its current form it is not very useful. The existing capability of loading GALEX imaging through the Aladin tool is very valuable. ----- Attempting Submission 1 (Fri May 11 18:53:38 GMT 2007) ----- Assigned ID: 1442 ----- Attempting Submission 1 (Fri Feb 09 22:56:19 GMT 2007) ----- Phase I Proposal 1442 (hst_prop) successfully submitted. ----- Attempting Submission 2 (Sat Feb 10 00:14:00 GMT 2007) ----- UV Imaging to Determine the Location of Residual Star Formation in Galaxies Recently Arrived on the Red Sequence We have indentified a sample of low-redshift (z = 0.04 - 0.10) galaxies that are candidates for recent arrival on the red sequence. They have red optical colors indicative of old stellar populations, but blue UV-optical colors that could indicate the presence of a small quantity of continuing or very recent star formation. However, their spectra lack the emission lines that characterize star-forming galaxies. We propose to use ACS/SBC to obtain high-resolution imaging of the UV flux in these galaxies, in order to determine the spatial distribution of the last episode of star formation. WFPC2 imaging will provide B, V, and I photometry to measure the main stellar light distribution of the galaxy for comparison with the UV imaging, as well as to measure color gradients and the distribution of interstellar dust. This detailed morphological information will allow us to investigate the hypothesis that these galaxies have recently stopped forming stars and to compare the observed distribution of the last star formation with predictions for several different mechanisms that may quench star formation in galaxies.

The galaxies in this sample have been selected as candidates for recent arrivals on the red sequence, based on their optical (g-r) and UV-optical colors and on their emission line properties. We have defined three subsamples of recently quenched galaxies, each potentially relevant to a different quenching mechanism. Eight targets have been selected in each of three subsamples in order to have a statistically relevant number of galaxies in each group, for a total of 24 galaxies. For each galaxy, this project will obtain 1 orbit of exposure with the ACS/SBC in the FUV (filter F115LP) and 1 orbit of optical imaging with WFPC2. The signal to noise (S/N) expected from one orbit of ACS/SBC imaging depends strongly on the actual distribution of the FUV light within the galaxy. The expected S/N ranges from a few for smoothly distributed light to several hundred for a single point source. This should allow us to distinguish between a UV-excess in the galaxy's old stars, a more concentrated or clumpy distribution of recent star formation, or central AGN activity as the source of the observed FUV flux. The corresponding WFPC2 imaging in the wide B (F450W) and I (F814W) bands is critical in order to compare the FUV flux distribution to the general stellar light of the galaxy. It will also also us to measure color gradients in the target galaxies and to map their dust content. Four out of 24 targets have been changed from the original Phase I proposal in order to avoid targets (in one case out of four) or nearby objects (in the other three cases) which were near or exceeded the bright object per-pixel count rate limit for the ACS/SBC instrument. This determination was based on predicted count rates calculated using the STScI IRAF package "synphot" and the worst-case assumption of an O star spectrum coming from a point source. The predicted count rate is based on a Bruzual synthetic O5V star spectrum normalized to the observed GALEX FUV magnitude. In all cases, the new targets have spectral, morphological, and color properties similar to the original targets they replaced and do not in any way change the science addressed by this observing proposal or the orbit usage. 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:max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3132 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v35.xml 1178818948475 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v36.xml 1178818949290 (Tic-Visit :proposal-id 11175 :visit-id "36" :proposal-version -1 :trans-version "20070325" :date "10-May-2007 10:42:29.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11175 :visit-id "36" :obset-id "36" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11175 :visit-id "36" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2865 :al-overhead-at-end 0 :internal-dur-at-end 119 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v36.xml 1178818949290 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v37.xml 1178818950119 Bright Object Tool produces health and safety warning for an object within the detector field of view. However, the GALEX photometry catalog for this field contains no FUV detections within 50" of the target, other than the target itself. The target itself is below the bright object limit of 50 counts/sec/pixel, based on the worst-case assumption: predicted count rates for an O5V star spectrum at the observed FUV magnitude, assuming all the counts fall in one pixel. The predicted count rates were calculated using the STScI IRAF package "synphot" with a Bruzual synthetic O5V star spectrum normalized to the observed GALEX FUV magnitude. 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However, the target is below the bright object limit of 50 counts/sec/pixel, based on the worst-case assumption: predicted count rates for an O5V star spectrum at the observed FUV magnitude, assuming all the counts fall in one pixel. The predicted count rates were calculated using the STScI IRAF package "synphot" with a Bruzual synthetic O5V star spectrum normalized to the observed GALEX FUV magnitude. There is one other FUV detection in the GALEX photometry catalog for this field within 50" of the target. Its FUV magnitude is 0.8 mag fainter than that of the target galaxy. 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However, the target is below the bright object limit of 50 counts/sec/pixel, based on the worst-case assumption: predicted count rates for an O5V star spectrum at the observed FUV magnitude, assuming all the counts fall in one pixel. The predicted count rates were calculated using the STScI IRAF package "synphot" with a Bruzual synthetic O5V star spectrum normalized to the observed GALEX FUV magnitude. 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"43" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2813 :al-overhead-at-end 0 :internal-dur-at-end 119 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3169 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v43.xml 1178818955048 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v44.xml 1178818955851 (Tic-Visit :proposal-id 11175 :visit-id "44" :proposal-version -1 :trans-version "20070325" :date "10-May-2007 10:42:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11175 :visit-id "44" :obset-id "44" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11175 :visit-id "44" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2793 :al-overhead-at-end 0 :internal-dur-at-end 119 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v44.xml 1178818955851 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v45.xml 1178818956686 (Tic-Visit :proposal-id 11175 :visit-id "45" :proposal-version -1 :trans-version "20070325" :date "10-May-2007 10:42:36.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11175 :visit-id "45" :obset-id "45" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11175 :visit-id "45" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 119 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3132 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v45.xml 1178818956686 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v46.xml 1178818957499 (Tic-Visit :proposal-id 11175 :visit-id "46" :proposal-version -1 :trans-version "20070325" :date "10-May-2007 10:42:37.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11175 :visit-id "46" :obset-id "46" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11175 :visit-id "46" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2845 :al-overhead-at-end 0 :internal-dur-at-end 119 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v46.xml 1178818957499 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v47.xml 1178818958337 (Tic-Visit :proposal-id 11175 :visit-id "47" :proposal-version -1 :trans-version "20070325" :date "10-May-2007 10:42:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11175 :visit-id "47" :obset-id "47" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11175 :visit-id "47" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2781 :al-overhead-at-end 0 :internal-dur-at-end 119 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3137 :pcs-gap 0 ) true 1 0 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v47.xml 1178818958337 /Users/graves/hst_cycle16/OP-cache/phaseII_orbits_in-v48.xml 1178818959183 (Tic-Visit :proposal-id 11175 :visit-id "48" :proposal-version -1 :trans-version "20070325" :date "10-May-2007 10:42:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 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