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J/ApJS/174/337 Star formation in nuclear rings (Mazzuca+, 2008)
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Beginning of ReadMe :J/ApJS/174/337 Star formation in nuclear rings (Mazzuca+, 2008)
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A connection between star formation in nuclear rings and their host galaxies.
Mazzuca L.M., Knapen J.H., Veilleux S., Regan M.W.
<Astrophys. J. Suppl. Ser., 174, 337-365 (2008)>
=2008ApJS..174..337M
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ADC_Keywords: Galaxies, ring ; Equivalent widths ; H II regions ;
Photometry, H-alpha
Keywords: galaxies: spiral - galaxies: structure - stars: formation
Abstract:
We present results from a photometric Halpha survey of 22 nuclear
rings, aiming to provide insight into their star formation properties,
including age distribution, dynamical timescales, star formation
rates, and galactic bar influence. We find a clear relationship
between the position angles and ellipticities of the rings and those
of their host galaxies, which indicates the rings are in the same
plane as the disk and circular. We use population synthesis models to
estimate ages of each Halpha-emitting (HII) region, which range from
1 to 10Myr throughout the rings. We find that approximately half of
the rings contain azimuthal age gradients that encompass at least 25%
of the ring, although there is no apparent relationship between the
presence or absence of age gradients and the morphology of the rings
or their host galaxies. NGC 1343, NGC 1530, and NGC 4321 show clear
bipolar age gradients, where the youngest HII regions are located near
the two contact points of the bar and ring. We speculate in these
cases that the gradients are related to an increased mass inflow rate
and/or an overall higher gas density in the ring, which would allow
for massive star formation to occur on short timescales, after which
the galactic rotation would transport the HII regions around the ring
as they age. Two-thirds of the barred galaxies show correlation
between the locations of the youngest HII region(s) in the ring and
the location of the contact points, which is consistent with
predictions from numerical modeling.
Description:
The ring images presented here are part of a larger William Herschel
Telescope (WHT) imaging survey (1999 and 2000) conducted to
characterize the nuclear and circumnuclear morphology in nearby
galaxies (Paper I, Knapen et al., 2006A&A...448..489K).