A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051

Yoshiaki Hagiwara; Philip J. Diamond; Makoto Miyoshi; Emmanouel Rovilos; Willem Baan

doi:10.1046/j.1365-8711.2003.07005.x

A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051

Yoshiaki Hagiwara, Philip J. Diamond, Makoto Miyoshi, Emmanouel Rovilos, Willem Baan

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

Abstract

Water vapour maser emission in the 616-523 transition towards the narrow-line type 1 Seyfert (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic water maser survey. The Doppler-shifted maser components appear to bracket maser components lying near the systemic velocity of the galaxy symmetrically. The tentative result of a Very Large Array (VLA) snapshot observation is that the masers are confined within 0.1 arcsec (5 pc at a distance D = 9.7 Mpc) of the radio continuum peak seen at 8.4 GHz. The low luminosity of the maser (∼2 L⊙) is not typical for masers that coincide with the radio continuum nucleus and appear associated with active galactic nucleus (AGN) activity. A low-luminosity maser in a type 1 Seyfert nucleus could be explained by a low maser gain resulting from the lower inclination of an obscuring disc around an active nucleus.

Original language	English
Pages (from-to)	L53-L57
Journal	Monthly Notices of the Royal Astronomical Society
Volume	344
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-8711.2003.07005.x
Publication status	Published - 1 Oct 2003

Keywords

Galaxies: active
Galaxies: individual: NGC 4051
Galaxies: Seyfert
Radio lines: galaxies

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10.1046/j.1365-8711.2003.07005.x

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title = "A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051",

abstract = "Water vapour maser emission in the 616-523 transition towards the narrow-line type 1 Seyfert (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic water maser survey. The Doppler-shifted maser components appear to bracket maser components lying near the systemic velocity of the galaxy symmetrically. The tentative result of a Very Large Array (VLA) snapshot observation is that the masers are confined within 0.1 arcsec (5 pc at a distance D = 9.7 Mpc) of the radio continuum peak seen at 8.4 GHz. The low luminosity of the maser (∼2 L⊙) is not typical for masers that coincide with the radio continuum nucleus and appear associated with active galactic nucleus (AGN) activity. A low-luminosity maser in a type 1 Seyfert nucleus could be explained by a low maser gain resulting from the lower inclination of an obscuring disc around an active nucleus.",

keywords = "Galaxies: active, Galaxies: individual: NGC 4051, Galaxies: Seyfert, Radio lines: galaxies",

author = "Yoshiaki Hagiwara and Diamond, {Philip J.} and Makoto Miyoshi and Emmanouel Rovilos and Willem Baan",

year = "2003",

month = oct,

day = "1",

doi = "10.1046/j.1365-8711.2003.07005.x",

language = "English",

volume = "344",

pages = "L53--L57",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "1365-2966",

publisher = "Oxford University Press",

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TY - JOUR

T1 - A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051

AU - Hagiwara, Yoshiaki

AU - Diamond, Philip J.

AU - Miyoshi, Makoto

AU - Rovilos, Emmanouel

AU - Baan, Willem

PY - 2003/10/1

Y1 - 2003/10/1

N2 - Water vapour maser emission in the 616-523 transition towards the narrow-line type 1 Seyfert (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic water maser survey. The Doppler-shifted maser components appear to bracket maser components lying near the systemic velocity of the galaxy symmetrically. The tentative result of a Very Large Array (VLA) snapshot observation is that the masers are confined within 0.1 arcsec (5 pc at a distance D = 9.7 Mpc) of the radio continuum peak seen at 8.4 GHz. The low luminosity of the maser (∼2 L⊙) is not typical for masers that coincide with the radio continuum nucleus and appear associated with active galactic nucleus (AGN) activity. A low-luminosity maser in a type 1 Seyfert nucleus could be explained by a low maser gain resulting from the lower inclination of an obscuring disc around an active nucleus.

AB - Water vapour maser emission in the 616-523 transition towards the narrow-line type 1 Seyfert (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic water maser survey. The Doppler-shifted maser components appear to bracket maser components lying near the systemic velocity of the galaxy symmetrically. The tentative result of a Very Large Array (VLA) snapshot observation is that the masers are confined within 0.1 arcsec (5 pc at a distance D = 9.7 Mpc) of the radio continuum peak seen at 8.4 GHz. The low luminosity of the maser (∼2 L⊙) is not typical for masers that coincide with the radio continuum nucleus and appear associated with active galactic nucleus (AGN) activity. A low-luminosity maser in a type 1 Seyfert nucleus could be explained by a low maser gain resulting from the lower inclination of an obscuring disc around an active nucleus.

KW - Galaxies: active

KW - Galaxies: individual: NGC 4051

KW - Galaxies: Seyfert

KW - Radio lines: galaxies

U2 - 10.1046/j.1365-8711.2003.07005.x

DO - 10.1046/j.1365-8711.2003.07005.x

M3 - Article

SN - 1365-2966

VL - 344

SP - L53-L57

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051

Abstract

Keywords

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