The SAURON project – VII. Integral-field absorption and emission-line kinematics of 24 spiral galaxy bulges

By J. Falc'on-Barroso, R. Bacon, M. Bureau, M. Cappellari, Roger Davies, P. de Zeeuw, Eric Emsellem, Kambiz Fathi, D. Krajnovi'c, H. Kuntschner and 3 more. 2006

155 citations recorded by the source corpus.

We present observations of the stellar and gas kinematics for a representative sample of 24 Sa galaxies obtained with our custom-built integral-field spectrograph SAURON operating on the William Herschel Telescope. The data have been homogeneously reduced and analysed by means of a dedicated pipeline. All resulting data cubes were spatially binned to a minimum mean signal-to-noise ratio of 60 per spatial and spectral resolution element. Our maps typically cover the bulge-dominated region. We find a significant fraction of kinematically decoupled components (12/24), many of them displaying central velocity dispersion minima. They are mostly aligned and co-rotating with the main body of the galaxies, and are usually associated with dust discs and rings detected in unsharp-masked images. Almost all the galaxies in the sample (22/24) contain significant amounts of ionized gas which, in general, is accompanied by the presence of dust. The kinematics of the ionized gas are consistent with circular rotation in a disc co-rotating with respect to the stars. The distribution of mean misalignments between the stellar and gaseous angular momenta in the sample suggests that the gas has an internal origin. The [O-III]/H beta ratio is usually very low, indicative of current star formation, and shows various morphologies (ring-like structures, alignments with dust lanes or amorphous shapes). The star formation rates (SFRs) in the sample are comparable with that of normal disc galaxies. Low gas velocity dispersion values appear to be linked to regions of intense star formation activity. We interpret this result as stars being formed from dynamically cold gas in those regions. In the case of NGC 5953, the data suggest that we are witnessing the formation of a kinematically decoupled component from cold gas being acquired during the ongoing interaction with NGC 5954.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/85127244ca3522c8d0d3216818d140188b4f00cc

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In Astronomy and Astrophysics

1. M. Cappellari
2. M. Sarzi
3. T. Naab
4. Roger Davies
5. P. Hopkins
6. Kevin Schawinski
7. Eric Emsellem
8. M. Bureau

In Instrumentation

1. M. Cappellari
2. M. Sarzi
3. M. Bureau
4. Eric Emsellem
5. T. Naab
6. Roger Davies
7. P. de Zeeuw
8. D. Krajnovi'c

Citations in the corpus

• GALAXY ZOO: THE FUNDAMENTALLY DIFFERENT CO-EVOLUTION OF SUPERMASSIVE BLACK HOLES AND THEIR EARLY- AND LATE-TYPE HOST GALAXIES (2010, methodology): “The advantage of this tool is that it is designed to minimize template mismatch, where emission and absorption lines are difficult to separate (see Falcón-Barroso et al. 2006 and Sarzi et al. 2006 for example applications).”
• PRECISE BLACK HOLE MASSES FROM MEGAMASER DISKS: BLACK HOLE–BULGE RELATIONS AT LOW MASS (2010, background): “Furthermore, there is a distinct drop inσ∗ within the inner 5′′ where the kinematics are dominated by rotation, presumably because the young bright stars trace the motion of the gas in which they formed (Barbosa et al. 2006; Falcón-Barroso et al. 2006).”
• The SAURON project - XVI. On the sources of ionization for the gas in elliptical and lenticular galaxies (2009, background): “6 we also show the sameSAURON measurements for the Sa galaxy NGC 4314 (from Falcón-Barroso et al. 2006), which hosts a central star-forming ring and where the nebular emission is stronger, in terms of equivalent width of the lines, than in NGC 3032 and NGC 4526.”
• The SAURON project – XII. Kinematic substructures in early-type galaxies: evidence for discs in fast rotators (2008, result): “About 10% of the SAURON early-types exhibit the central drop (but additional 20% have flat central profiles), which is much less compared to 46% among the Sa bulges, also observed with SAURON data (Falcón-Barroso et al. 2006).”
• AINUR: Atlas of Images of NUclear Rings (2009, unknown): “NGC 4274: Falcón-Barroso et al. (2006).”
• The ATLAS3D project – I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria (2010, methodology): “49 ETGs were part of the main survey (de Zeeuw et al. 2002), out of which 47 were presented in the sub-sample of ETGs (Emsellem et al. 2004) and two in the early-spirals sub-sample (Falcón-Barroso et al. 2006).”