Fine-scale structure of the neutral ISM in M81

Ioannis Bagetakos; Elias Brinks; Fabian Walter; Erwin De Blok

doi:10.1017/S1743921307001822

Fine-scale structure of the neutral ISM in M81

Ioannis Bagetakos^*, Elias Brinks, Fabian Walter, Erwin De Blok

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We present an analysis of the finescale structure of the neutral ISM as traced via the 21-cm line of atomic hydrogen (HI) in the nearby galaxy M 81. The data show a stunning amount of detail in the form of 330 expanding shells and holes in the neutral ISM of M 81. A comparison with similar structures found in two other spirals and two dwarf galaxies (M 31, M 33, IC 2574 and Holmberg II) reveals that the ISM in M 81 shares a lot of similarities with the two spirals, whereas the structure of its ISM is different to that in dwarf galaxies. The sizes of the HI holes in M 81 range from 80 pc (close to the resolution limit) to 600 pc; the expansion velocities can reach 20 km s¹; estimated ages are 2.5 to 35 Myrs and the energies involved range from 10⁵⁰ to 3.5 x 10⁵² ergs. The amount of neutral gas involved is of order 10⁴ to 10⁶ solar masses.

Original language	English
Pages (from-to)	394
Number of pages	1
Journal	Proceedings of the International Astronomical Union
Volume	2
Issue number	S237
DOIs	https://doi.org/10.1017/S1743921307001822
Publication status	Published - Aug 2006

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title = "Fine-scale structure of the neutral ISM in M81",

abstract = "We present an analysis of the finescale structure of the neutral ISM as traced via the 21-cm line of atomic hydrogen (HI) in the nearby galaxy M 81. The data show a stunning amount of detail in the form of 330 expanding shells and holes in the neutral ISM of M 81. A comparison with similar structures found in two other spirals and two dwarf galaxies (M 31, M 33, IC 2574 and Holmberg II) reveals that the ISM in M 81 shares a lot of similarities with the two spirals, whereas the structure of its ISM is different to that in dwarf galaxies. The sizes of the HI holes in M 81 range from 80 pc (close to the resolution limit) to 600 pc; the expansion velocities can reach 20 km s1; estimated ages are 2.5 to 35 Myrs and the energies involved range from 1050 to 3.5 x 1052 ergs. The amount of neutral gas involved is of order 104 to 106 solar masses.",

keywords = "Galaxies: individual (M 81), Galaxies: ISM, ISM: structure, Radio lines: ISM",

author = "Ioannis Bagetakos and Elias Brinks and Fabian Walter and \{De Blok\}, Erwin",

year = "2006",

month = aug,

doi = "10.1017/S1743921307001822",

language = "English",

volume = "2",

pages = "394",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

number = "S237",

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TY - JOUR

T1 - Fine-scale structure of the neutral ISM in M81

AU - Bagetakos, Ioannis

AU - Brinks, Elias

AU - Walter, Fabian

AU - De Blok, Erwin

PY - 2006/8

Y1 - 2006/8

N2 - We present an analysis of the finescale structure of the neutral ISM as traced via the 21-cm line of atomic hydrogen (HI) in the nearby galaxy M 81. The data show a stunning amount of detail in the form of 330 expanding shells and holes in the neutral ISM of M 81. A comparison with similar structures found in two other spirals and two dwarf galaxies (M 31, M 33, IC 2574 and Holmberg II) reveals that the ISM in M 81 shares a lot of similarities with the two spirals, whereas the structure of its ISM is different to that in dwarf galaxies. The sizes of the HI holes in M 81 range from 80 pc (close to the resolution limit) to 600 pc; the expansion velocities can reach 20 km s1; estimated ages are 2.5 to 35 Myrs and the energies involved range from 1050 to 3.5 x 1052 ergs. The amount of neutral gas involved is of order 104 to 106 solar masses.

AB - We present an analysis of the finescale structure of the neutral ISM as traced via the 21-cm line of atomic hydrogen (HI) in the nearby galaxy M 81. The data show a stunning amount of detail in the form of 330 expanding shells and holes in the neutral ISM of M 81. A comparison with similar structures found in two other spirals and two dwarf galaxies (M 31, M 33, IC 2574 and Holmberg II) reveals that the ISM in M 81 shares a lot of similarities with the two spirals, whereas the structure of its ISM is different to that in dwarf galaxies. The sizes of the HI holes in M 81 range from 80 pc (close to the resolution limit) to 600 pc; the expansion velocities can reach 20 km s1; estimated ages are 2.5 to 35 Myrs and the energies involved range from 1050 to 3.5 x 1052 ergs. The amount of neutral gas involved is of order 104 to 106 solar masses.

KW - Galaxies: individual (M 81)

KW - Galaxies: ISM

KW - ISM: structure

KW - Radio lines: ISM

UR - https://www.scopus.com/pages/publications/37049036895

U2 - 10.1017/S1743921307001822

DO - 10.1017/S1743921307001822

M3 - Article

AN - SCOPUS:37049036895

SN - 1743-9213

VL - 2

SP - 394

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - S237

ER -

Fine-scale structure of the neutral ISM in M81

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