A PHOTODISSOCIATION MODEL FOR THE MORPHOLOGY OF HI NEAR OB ASSOCIATIONS IN M33

Jonathan S. Heiner; Ronald J. Allen; Pieter C. van der Kruit

doi:10.1088/0004-637X/700/1/545

A PHOTODISSOCIATION MODEL FOR THE MORPHOLOGY OF HI NEAR OB ASSOCIATIONS IN M33

Jonathan S. Heiner^*, Ronald J. Allen, Pieter C. van der Kruit

^*Corresponding author for this work

Astronomy

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

6 Citations (Scopus)

Abstract

We present an approach for analyzing the morphology and physical properties of Hi features near giant OB associations in M33, in the context of a model whereby the Hi excess arises from photodissociation of the molecular gas in remnants of the parent giant molecular clouds (GMCs). Examples are presented here in the environs of NGC 604 and CPSDP Z204, two prominent HII regions in M33. These are the first results of a detailed analysis of the environs of a large number of OB associations in that galaxy. We present evidence for "diffusion" of the far-UV radiation from the OB association through a clumpy remnant GMC, and show further that enhanced CO(1-0) emission appears preferentially associated with GMCs of higher volume density.

Original language	English
Pages (from-to)	545-550
Number of pages	6
Journal	Astrophysical Journal
Volume	700
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/700/1/545
Publication status	Published - 20-Jul-2009

Keywords

galaxies: individual (M33)
galaxies: ISM
H II regions
ISM: clouds
ISM: molecules
ultraviolet: galaxies
GIANT MOLECULAR CLOUDS
LARGE-SCALE DISSOCIATION
INTERSTELLAR-MEDIUM
VOLUME DENSITIES
NEARBY GALAXIES
GAS
REGIONS
EMISSION
CO
NGC-604

Access to Document

10.1088/0004-637X/700/1/545

Handle.net

Persistent link

Embargoed Document

A PHOTODISSOCIATION MODEL FOR THE MORPHOLOGY OF HI NEAR OB ASSOCIATIONS
Final publisher's version, 874 KB
Request copy

Cite this

@article{17933cdca59646d5b4ce3016493eddae,

title = "A PHOTODISSOCIATION MODEL FOR THE MORPHOLOGY OF HI NEAR OB ASSOCIATIONS IN M33",

abstract = "We present an approach for analyzing the morphology and physical properties of Hi features near giant OB associations in M33, in the context of a model whereby the Hi excess arises from photodissociation of the molecular gas in remnants of the parent giant molecular clouds (GMCs). Examples are presented here in the environs of NGC 604 and CPSDP Z204, two prominent HII regions in M33. These are the first results of a detailed analysis of the environs of a large number of OB associations in that galaxy. We present evidence for {"}diffusion{"} of the far-UV radiation from the OB association through a clumpy remnant GMC, and show further that enhanced CO(1-0) emission appears preferentially associated with GMCs of higher volume density.",

keywords = "galaxies: individual (M33), galaxies: ISM, H II regions, ISM: clouds, ISM: molecules, ultraviolet: galaxies, GIANT MOLECULAR CLOUDS, LARGE-SCALE DISSOCIATION, INTERSTELLAR-MEDIUM, VOLUME DENSITIES, NEARBY GALAXIES, GAS, REGIONS, EMISSION, CO, NGC-604",

author = "Heiner, {Jonathan S.} and Allen, {Ronald J.} and {van der Kruit}, {Pieter C.}",

year = "2009",

month = jul,

day = "20",

doi = "10.1088/0004-637X/700/1/545",

language = "English",

volume = "700",

pages = "545--550",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP PUBLISHING LTD",

number = "1",

}

TY - JOUR

T1 - A PHOTODISSOCIATION MODEL FOR THE MORPHOLOGY OF HI NEAR OB ASSOCIATIONS IN M33

AU - Heiner, Jonathan S.

AU - Allen, Ronald J.

AU - van der Kruit, Pieter C.

PY - 2009/7/20

Y1 - 2009/7/20

N2 - We present an approach for analyzing the morphology and physical properties of Hi features near giant OB associations in M33, in the context of a model whereby the Hi excess arises from photodissociation of the molecular gas in remnants of the parent giant molecular clouds (GMCs). Examples are presented here in the environs of NGC 604 and CPSDP Z204, two prominent HII regions in M33. These are the first results of a detailed analysis of the environs of a large number of OB associations in that galaxy. We present evidence for "diffusion" of the far-UV radiation from the OB association through a clumpy remnant GMC, and show further that enhanced CO(1-0) emission appears preferentially associated with GMCs of higher volume density.

AB - We present an approach for analyzing the morphology and physical properties of Hi features near giant OB associations in M33, in the context of a model whereby the Hi excess arises from photodissociation of the molecular gas in remnants of the parent giant molecular clouds (GMCs). Examples are presented here in the environs of NGC 604 and CPSDP Z204, two prominent HII regions in M33. These are the first results of a detailed analysis of the environs of a large number of OB associations in that galaxy. We present evidence for "diffusion" of the far-UV radiation from the OB association through a clumpy remnant GMC, and show further that enhanced CO(1-0) emission appears preferentially associated with GMCs of higher volume density.

KW - galaxies: individual (M33)

KW - galaxies: ISM

KW - H II regions

KW - ISM: clouds

KW - ISM: molecules

KW - ultraviolet: galaxies

KW - GIANT MOLECULAR CLOUDS

KW - LARGE-SCALE DISSOCIATION

KW - INTERSTELLAR-MEDIUM

KW - VOLUME DENSITIES

KW - NEARBY GALAXIES

KW - GAS

KW - REGIONS

KW - EMISSION

KW - CO

KW - NGC-604

U2 - 10.1088/0004-637X/700/1/545

DO - 10.1088/0004-637X/700/1/545

M3 - Article

SN - 0004-637X

VL - 700

SP - 545

EP - 550

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

A PHOTODISSOCIATION MODEL FOR THE MORPHOLOGY OF HI NEAR OB ASSOCIATIONS IN M33

Abstract

Keywords

Access to Document

Handle.net

Embargoed Document

Fingerprint

Cite this