Magnetic fields and infall motions in NGC 1333 Iras 4

Michael Attard; Martin Houde; Giles Novak; Hua Bai Li; John E. Vaillancourt; C. Darren Dowell; Jacqueline Davidson; Hiroko Shinnaga

doi:10.1088/0004-637X/702/2/1584

Magnetic fields and infall motions in NGC 1333 Iras 4

Michael Attard^*, Martin Houde, Giles Novak, Hua Bai Li, John E. Vaillancourt, C. Darren Dowell, Jacqueline Davidson, Hiroko Shinnaga

^*Corresponding author for this work

Physics and Astronomy

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

33 Scopus citations

Abstract

We present single-dish 350 μm dust continuum polarimetry as well as HCN and HCO⁺ J = 4 → 3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a uniform field morphology over a 20″ radius from the peak continuum flux of IRAS 4A, in agreement with models of magnetically supported cloud collapse. The field morphology around IRAS 4B appears to be quite distinct, however, with indications of depolarization observed toward the peak flux of this source. Inverse P Cygni profiles are observed in the HCN J = 4 → 3 line spectra toward IRAS 4A, providing a clear indication of infall gas motions. Taken together, the evidence gathered here appears to support the scenario that IRAS 4A is a cloud core in a critical state of support against gravitational collapse.

Original language	English (US)
Pages (from-to)	1584-1592
Number of pages	9
Journal	Astrophysical Journal
Volume	702
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/702/2/1584
State	Published - 2009

Keywords

ISM: individual (NGC 1333 IRAS 4)
ISM: magnetic fields
ISM: molecules
Polarization
Stars: formation
Submillimeter

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1088/0004-637X/702/2/1584

Cite this

@article{0b6b1088a47c4f6ea364457c6192748d,

title = "Magnetic fields and infall motions in NGC 1333 Iras 4",

abstract = "We present single-dish 350 μm dust continuum polarimetry as well as HCN and HCO+ J = 4 → 3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a uniform field morphology over a 20″ radius from the peak continuum flux of IRAS 4A, in agreement with models of magnetically supported cloud collapse. The field morphology around IRAS 4B appears to be quite distinct, however, with indications of depolarization observed toward the peak flux of this source. Inverse P Cygni profiles are observed in the HCN J = 4 → 3 line spectra toward IRAS 4A, providing a clear indication of infall gas motions. Taken together, the evidence gathered here appears to support the scenario that IRAS 4A is a cloud core in a critical state of support against gravitational collapse.",

keywords = "ISM: individual (NGC 1333 IRAS 4), ISM: magnetic fields, ISM: molecules, Polarization, Stars: formation, Submillimeter",

author = "Michael Attard and Martin Houde and Giles Novak and Li, {Hua Bai} and Vaillancourt, {John E.} and Dowell, {C. Darren} and Jacqueline Davidson and Hiroko Shinnaga",

year = "2009",

doi = "10.1088/0004-637X/702/2/1584",

language = "English (US)",

volume = "702",

pages = "1584--1592",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2",

}

TY - JOUR

T1 - Magnetic fields and infall motions in NGC 1333 Iras 4

AU - Attard, Michael

AU - Houde, Martin

AU - Novak, Giles

AU - Li, Hua Bai

AU - Vaillancourt, John E.

AU - Dowell, C. Darren

AU - Davidson, Jacqueline

AU - Shinnaga, Hiroko

PY - 2009

Y1 - 2009

N2 - We present single-dish 350 μm dust continuum polarimetry as well as HCN and HCO+ J = 4 → 3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a uniform field morphology over a 20″ radius from the peak continuum flux of IRAS 4A, in agreement with models of magnetically supported cloud collapse. The field morphology around IRAS 4B appears to be quite distinct, however, with indications of depolarization observed toward the peak flux of this source. Inverse P Cygni profiles are observed in the HCN J = 4 → 3 line spectra toward IRAS 4A, providing a clear indication of infall gas motions. Taken together, the evidence gathered here appears to support the scenario that IRAS 4A is a cloud core in a critical state of support against gravitational collapse.

AB - We present single-dish 350 μm dust continuum polarimetry as well as HCN and HCO+ J = 4 → 3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a uniform field morphology over a 20″ radius from the peak continuum flux of IRAS 4A, in agreement with models of magnetically supported cloud collapse. The field morphology around IRAS 4B appears to be quite distinct, however, with indications of depolarization observed toward the peak flux of this source. Inverse P Cygni profiles are observed in the HCN J = 4 → 3 line spectra toward IRAS 4A, providing a clear indication of infall gas motions. Taken together, the evidence gathered here appears to support the scenario that IRAS 4A is a cloud core in a critical state of support against gravitational collapse.

KW - ISM: individual (NGC 1333 IRAS 4)

KW - ISM: magnetic fields

KW - ISM: molecules

KW - Polarization

KW - Stars: formation

KW - Submillimeter

UR - http://www.scopus.com/inward/record.url?scp=70549102382&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70549102382&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/702/2/1584

DO - 10.1088/0004-637X/702/2/1584

M3 - Article

AN - SCOPUS:70549102382

SN - 0004-637X

VL - 702

SP - 1584

EP - 1592

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Magnetic fields and infall motions in NGC 1333 Iras 4

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this