8-13 micron spectroscopy of NGC 253: a spatially resolved starburst

NGC 253 is a nearby spiral galaxy that is currently undergoing a nuclear burst of star formation in a 100 pc diameter region. We present spatially resolved 8--13 micron low-resolution spectra at four positions along the ridge of 8--13 micron emission. We find that the relative strengths of the ionic, dust emission features, and dust continuum emission vary with position in the galaxy but can be accounted for everywhere without recourse to extinction by silicates. The brightest mid-infrared peak (which is displaced from the nucleus) has elevated levels of both continuum and 11.1--12.9 micron `plateau' emission, indicative of dust heated within a photo-dissociation region. Spectra obtained over the course of 3 yr at the position of the brightest mid-infrared peak show no significant time variation.

References(48)

Figures(0)

Wynn-Williams C. G., Cruikshank D. P., 1981, in

Aitken D. K.

eds, Proc. IAU Symp. 96, Infrared Astronomy Dor

1973

Aitken D. K.
,
Jones B.

- Astrophys.J. 184 (1973) 127

1984

Aitken D. K
,
Roche P. F.

- Mon.Not.Roy.Astron.Soc. 208 (1984) 751

Matthews

Becklin E. E.
,
Neugebauer G.
,
Beckwith S.
,
Gatley I.

K 1976

Sarazin C.
,
Werner M. W.

- Astrophys.J. 207 (1976) 770

Geballe

Bregman J. D.
,
Allamandola L. J.
,
Tielens A.G.G. M.

T. R 1989

Witteborn F. C.

- Astrophys.J. 344 (1989) 791

1995

Cohen M.
,
Davies J. K.

- Mon.Not.Roy.Astron.Soc. 276 (1995) 715

1992b, AJ

Cohen M.
,
Walker R. G.
,
Barlow M. J.
,
Deacon J. R.

Wooden

Cohen M.
,
Witteborn F. C.
,
Carbon D. F.
,
Augason G.

D 1992a, AJ, 104, 2045

Bregman J.
,
Goorvitch D.

The 8-micrometer - 13-micrometer spectrum of Arp-299C

C.C. Dudley
(
- Hawaii U.
)
,
C.G. Wynn-Williams
(
- Hawaii U.
)

- Astrophys.J.Lett. 407 (1993) L65
•
e-Print:
- astro-ph/9302011
•
DOI:
- 10.1086/186807

The deep silicate absorption feature in iras 08572+3915 and other infrared galaxies

- Astrophys.J. 488 (1997) 720
•
e-Print:
- astro-ph/9705242
•
DOI:
- 10.1086/304720

Allamandola L. J., Tielens A. G. G. M., 1989, in

Duley W. W.

1994

Ellis K.
,
Guillois O.
,
Nenner I.
,
Papoular R.
,
Reynard C.

in Molecules and Grains in Space, New York

Nenner I.

Genzel R.
,
Becklin E. E.
,
Wynn-Williams C. G.
,
Moran J. M.

1982

Reid M. J.
,
Jaffe D. T.
,
Downes D.

- Astrophys.J. 255 (1982) 527

1995, ApJ, 438

Hanner M. S.
,
Brooke T. Y.
,
Tokunaga A. T.

1994

Kalas P.
,
Wynn-Williams C. G.

- Astrophys.J. 434 (1994) 546

Keto E.
,
Ball R.
,
Arens J.
,
Jernigan G.
,
Meixner M.

et al.

1993

Graham J.

- Astrophys.J. 413 (1993) L23

Model atmospheres for G, F, A, B, and O stars

Robert L. Kurucz
(
- Harvard-Smithsonian Ctr. Astrophys. and
- Kitt Peak Observ.
)

- Astrophys.J.Suppl. 40 (1979) 1-340
•
DOI:
- 10.1086/190589

Interstellar dust and extinction

John S. Mathis
(
- Washburn Observ.
)

- Ann.Rev.Astron.Astrophys. 28 (1990) 37-70
•
DOI:
- 10.1146/annurev.aa.28.090190.000345

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