Mapping Baryons in the Halo of NGC 1097

Assigned ID: 332 ----- Attempting Submission 1 (Fri Feb 24 08:14:50 GMT 2012) ----- ----- Attempting Submission 1 (Thu Jul 05 06:04:55 GMT 2012) ----- 1. Target positions *are* known to accuracies < 0.4" 2. Don't think these are "sensitive" exposures (?) so ETC run numbers uneccessary. 3. Adding additional FP-POS positions doesn't fit well into orbits. For such low S/N data, 3 FP-POS positions would seem adequate anyway? Thanks! Mapping Baryons in the Halo of NGC 1097 We propose observing 5 background QSOs whose sightlines pass through the halo of NGC 1097 at impact parameters of 53-183 kpc. NGC 1097 is a bright (-21.1) spiral galaxy that has the highest surface density of background, UV-bright QSOs in the nearby Universe. The galaxy hosts a low luminosity AGN at its core, surrounded by a ring of intense star-forming regions; there is also evidence from stellar tidal streams that the galaxy has recently cannibalized a number of dwarf galaxies, and a companion dwarf elliptical is still clearly merging with the outer disk. We aim to examine the physical conditions of gas that fills the halo of such an active galaxy. We will search primarily for Lya and SiIV absorption lines in the spectra of the background QSOs, as well as weak NV from hot gas. At the lowest impact parameters, we may also be able to find absorption lines from low ionization species. Our goals are to test whether the halo of NGC 1097 contains the same distribution of Lyman-alpha forest clouds seen at higher redshifts out to large distances from galaxies, and determine how the HI column density, covering fraction, and temperature of the gas decline with radius in a single galaxy halo. We will examine whether the velocities of the absorbers are consistent with those expected from gas co-rotating in the dark matter halo of the galaxy, or whether there exists a distribution of velocities that might indicate outflows from the galactic disk or from the central AGN, or, alternatively, from inflows from the IGM. Our map of Lya and SiIV around NGC 1097 will provide an important template for understanding the origin of higher redshift QSO absorption line systems. Our aim is to use the G130M grating of COS to search for absorption lines from gas in the halo of NGC1097, towards 5 background QSO probes. Our primary goal is to search for Lyman-alpha absorption at the redshift of the galaxy, cz=1100-1450 km/s (1220A) as well as SiIV and NV. Additional lower-ionization lines may also be present in some cases. Exposures towards individual sightlines are split into two halves with different central wavelengths (1291 and 1327A) in order to cover the gap in the COS detectors. For each central wavelength, multiple FP-POS positions are used. All targets have known GALEX fluxes. We expect to obtain a S/N of at least 10 per resolution element in the data. QUASAR ABSORPTION LINES AND IGM 12 false 0.0 0.0 false false false false SUPPORTED GALAXY QSO 6DFJ0248220-303806 J2000 J2000 GALEX FUV=126 micro-Jy GALAXY STARBURST J2000 J2000 GALEX FUV=63 micro-Jy GALAXY QSO J2000 J2000 GALEX FUV=57 micro-Jy GALAXY QSO 1RXSJ024821.5-303807 J2000 J2000 GALEX FUV=97 micro-Jy GALAXY QSO 2MASSIJ0243376-303048 1RXSJ024337.8-303047 J2000 J2000 GALEX FUV=155 micro-Jy COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 1341467463313 /tmp/OPVisit2204720315378005145.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. 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BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds BUFFER-TIME is EXPTIME-110 seconds 1341467470595 /home/dvb/Props/c20/n1097/P2/OP-cache/12988-v30.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 12988 :visit-id "40" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 01:51:21.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 374192 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12988 :visit-id "40" :obset-id "40" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12988 :visit-id "40" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2622 :al-overhead-at-end 0 :internal-dur-at-end 48 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12988 :visit-id "40" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2775 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12988 :visit-id "40" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2775 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12988 :visit-id "40" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2775 :al-overhead-at-end 0 :internal-dur-at-end 366 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) true 4 0 Exposure time assumes NUV flux (GALEX NUV=19.2) is half that measured by GALEX (so NUV=20.0) to account for possible variations in QSO flux. 1341467485674 /tmp/OPVisit2874479215059753964.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 12988 :visit-id "70" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 01:51:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 556896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12988 :visit-id "70" :obset-id "70" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12988 :visit-id "70" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2625 :al-overhead-at-end 0 :internal-dur-at-end 48 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12988 :visit-id "70" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2774 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12988 :visit-id "70" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2775 :al-overhead-at-end 0 :internal-dur-at-end 366 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2997 :pcs-gap 0 ) true 3 0 Exposure time assumes NUV flux (GALEX NUV=17.6) is half that measured by GALEX (so NUV=18.4) to account for possible variations in QSO flux.