Probing the Outer Regions of M31 with QSO Absorption Lines
We propose HST-COS spectroscopy of 10 quasars behind M31. Absorption lines due to MgII, FeII, CIV, and a variety of other lines will be searched for and measured. Six quasars lie between 1 and 4.2 Holmberg radii near the major axis on the southwest side, where confusion with Milky Way gas is minimized. Two lie even farther out on the southwest side of the major axis. One lies within 1 Holmberg radius. Two of the 10 pass through M31's high velocity clouds seen in a detailed 21 cm emission map. Exposure time estimates were based on SDSS magnitudes and available GALEX magnitudes. Thus, using the most well-studied external spiral galaxy in the sky, our observations will permit us to check, better than ever before, the standard picture that quasar metal-line absorption systems such as MgII and CIV arise in an extended gaseous halo/disk of a galaxy well beyond its observable optical radius. The observations will yield insights into the nature of the gas and its connection to the very extended stellar components of M31 that have recently been studied. Notably the observations have the potential of extending M31's rotation curve to very large galactocentric distances, thereby placing new constrants on M31's dark matter halo.
Finally, we also request that the coordinated parallel orbits be allocated to this program so that we may image the resolved stellar content of M31's halo and outer disk.
We are obtaining COS G230L spectra of 10 quasars with sightlines that pass through the outer regions of M31. Seven of these will also be observed with COS G140L. These spectra will be used to study metal absorption lines, specifically MgII and CIV, in the halo, disk, and high velocity clouds of M31. Coordinated parallel ACS/WFC observations with F814W and F606W are also being obtained to study the stellar populations in the halo, disk, and HVCs of M31.
The observations will yield ~4 sigma detections of MgII 2796 lines with REW = 0.3 A, and 3 sigma or 4 sigma detections of the CIV 1548 lines at REW = 0.15 A. A minimum of 3 exposures per grating are included. The coordinated parallels include approximately two-thirds of the exposure time with F814W and one-third with F606W.
QUASAR ABSORPTION LINES AND IGM
12
false
0.0
0.0
false
false
false
false
false
false
SUPPORTED
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 17.67, FUV =18.69, NUV=18.34
J2000
00 18 47.4485
+34 12 9.58
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.08
J2000
00 24 50.0460
+34 39 42.80
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 17.52
J2000
00 30 17.4314
+37 00 54.26
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.50, FUV=19.73, NUV=19.09
J2000
00 31 32.3702
+37 27 51.82
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.63, FUV=22.07, NUV=19.00
J2000
02 29 51.4548
+39 46 19.27
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.41
J2000
00 37 48.0000
+39 08 58.66
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.54
J2000
00 40 59.0299
+39 15 12.32
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.19, FUV=20.14, NUV=18.27
J2000
00 43 52.4525
+40 16 29.43
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.01, FUV=18.46, NUV=18.41
J2000
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+42 34 30.28
J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
u = 18.07, FUV=19.01, NUV=18.49
J2000
00 46 55.5154
+42 20 50.08
J2000
COS/FUV
Spectroscopic
No
No
G140L
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COS/NUV
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G230L
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Spectroscopic
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Spectroscopic
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Spectroscopic
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Spectroscopic
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Spectroscopic
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No
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No
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No
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No
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ACS/WFC
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No
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ACS/WFC
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No
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ACS/WFC
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No
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ACS/WFC
Imaging
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No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
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(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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true
5
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
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(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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true
4
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
1283512891000
215.73557034683358
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:data-volume 3013248
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(Tic-Obset
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)
(Tic-Orbit
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(Tic-Orbit
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true
3
0
Repeat of orbits 2 and 3 of partially failed visit 04.
Any orientation is acceptable for the parallel observations, but the orientation must remain the same for all exposures in this Visit.
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)
(Tic-Orbit
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true
2
0