The Interstellar Medium of External
Galaxies
This page contains html links to all of the articles used in Astronomy 208 in the
discussion of the ISM in other galaxies on 12/10/98, and some others.
Outline of the Lecture on the ISM
in External Galaxies, including Articles & Figures Used
The Extent of Galaxies
How far "out" does the
ISM go?
Digel,
S., De Geus, E. and Thaddeus, P. 1994, Molecular clouds in the extreme
outer galaxy, ApJ, 422, 92-101.
- Figure
1: Column density of H I at R=18 to 30 kpc in the Milky Way
- Figure
4: Locations of Distant clouds in the Milky Way
High-Velocity Clouds
Danly,
L., Albert, C.E. and Kuntz, K.D. 1993, A Determination of the Distance
to the High-Velocity Cloud Complex M, ApjL, 416, L29.
- Figure
1: H I spectra and uv-absorption spectra used in distance determination
The Magellanic Stream, "Bridges,"
& "Tails"
Wayte,
S.R. 1989, The Magellanic Stream - New observations, Astronomical
Society of Australia, Proceedings, 8, 195-203.
- Figure
1: Global Distribution of H I in the Magellanic Stream
- Figure
8: Distribution of Extreme- and High-Velocity Clouds associated with
the Stream
The
Origin of the Magellanic Stream, by Ben Moore & Marc Davis, 1996
(html document)
Discussion: HVC's & Galaxy Interactions
Intergalactic Gas: problem: normal (processed) abundances
Galactic Fountain: problem: some clouds too fast for MW potential
Tidal Bridges/Stripping/Tails: does this explain all HVCs?
Evidence of galaxy interaction/mergers: e.g. Cen A
Metallicity Variations
The Large Magellanic Cloud
Cohen,
R.S., Dame, T.M., Garay, G., Montani, J., Rubio, M. and Thaddeus, P. 1988,
A complete CO survey of the Large Magellanic Cloud, ApJL,
331, L95-L99.
- Figure
1: CO map of the LMC
- Figure
2: Luminosity-Linewidth Relation, showing lower metallicity than Milky
Way
- Optical Image
of the LMC
Varitions with Galaxy Type
Richer,
M.G. and McCall, M.L. 1995, Oxygen abundances in diffuse ellipticals
and the metallicity-luminosity relations for dwarf galaxies, ApJ,
445, 642-659.
The 30 Doradus Region in the LMC
HST Data: Scowen,
P.A. et al. 1998, Ionization Structure in the 30 Doradus Nebula as seen
with Hubble Space Telescope Wide Field Planetary Camera 2, AJ, 116,
163. (source of handouts)
Models: Tenorio-Tagle,
G. and Medina-Tanco, G.A. 1998, Star Clusters and the Structure of the
ISM: Tunnels and Wakes in Giant Extragalactic H II Regions, ApJ, 503,
171.
Star-Formation and Magnetic Fields
in External Galaxies
Rand,
R.J., Kulkarni, S.R. and Rice, W. 1992, Star formation and the distribution
of HI and infrared emission in M51, ApJ, 390, 66-78.
- Figure
1: CO, H-alpha, H I and red continuum images of M51, compared
Scarrott,
S.M., Ward-Thompson, D. and Warren-Smith, R.F. 1987, Evidence for a spiral
magnetic field configuration in the galaxy M51, MNRAS, 224,
299-305.
- Figure
3: Optical Polarization Map of M51
Magnetic Fields in External Galaxies
M51: a face-on spiral
Beck,
R., Wielebinski, R. and Klein, U. 1987, The magnetic field in M51,
A&A, 186, 95-98.
- Figure:
Polarization of Radio Synchrotron Emission in M51
Neininger,
N. 1992, The magnetic field structure of M51, A&A, 263,
30-36.
Berkhuijsen,
E.M. et al. 1997, Magnetic Fields in the Disk and Halo of M51, A&A,
318, 700.
Figure:
Synchrotron Polarization Maps at Several Wavelengths (handed out).
NGC 4631: halo of an edge-on galaxy
Hummel,
E., Beck, R. and Dahlem, M. 1991, The magnetic field structure in the
radio halos of NGC 891 and NGC 4631, A&A, 248, 23-29.
- Figure:
Polarization of Radio Synchrotron Emission in NGC 4631
The Structure of the ISM in Dwarf/Irregular
Galaxies
Puche,
D., Westpfahl, D., Brinks, E. and Roy, J.-R. 1992, Holmberg II - A laboratory
for studying the violent interstellar medium, AJ, 103,
1841-1858, 2115-2123. (This is the galaxy where the HI distribution,
presumably created by SN shells, mimics spiral structure in extensive VLA
maps.)
- Figure
12: Location of the H I holes in Ho II
- Plates: to see plates, enter plate number below at the bottom of the
main article page.
- Plate 107: Maps of HI integrated intensity in Ho II
- Plate 109: H-alpha image of the central 5x5 arcmin of Ho II
-
Other interesting recent results on the ISM of other galaxies:
Rotation Curve of the Milky Way and Other Galaxies
Vallee,
J.P. 1994, Galactic magnetism and the rotation curves of M31 and the
Milky Way, ApJ, 437, 179-183.
- Figure
1: Magnetic Field as a Function of Radial Distance in M31
- Figure
2: Magnetic Field as a Function of Radial Distance in the Milky Way
- Figures
3 & 4: Rotation Curves for M31 and the Milky Way, respectively
This page prepared by Alyssa
A. Goodman.