Recent Star Formation in the Extreme Outer Disk of M83

Thilker, David A.; Bianchi, Luciana; Boissier, S.; Paz, A. Gil de; Madore, Barry F.; Martin, D. Christopher; Meurer, G. R.; Neff, Susan G.; Rich, R. Michael; Schiminovich, David; Seibert, Mark; Wyder, Ted K.; Barlow, Tom A.; Byun, Yong Ik; Donas, J.; Forster, Karl; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick; Lee, Young-Wook; Malina, Roger F.; Milliard, B.; Morrissey, Patrick; Siegmund, Oswald H. W.; Small, Todd; Szalay, Alexander S.; Welsh, Barry Y.

doi:10.1086/425251

Cited by 280 publications

(377 citation statements)

References 21 publications

(21 reference statements)

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“…In the past few years, the GALaxy Evolution eXplorer (GALEX) satellite has been providing astonishing ultraviolet (UV) images of galaxies and revealing recent star-formation activity in their external regions (i.e., Gil de Paz 2005, 2007Thilker et al 2005;. The GALEX point spread function in the central 0.5 • has a full width at half-maximum of ∼5 arcsec, matching the spatial resolution of our optical/NIR images quite nicely.…”

Section: Fuv Datasupporting

confidence: 64%

Massive star formation in Wolf-Rayet galaxies

López-Sánchez

2010

A&A

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Aims. We performed a comprehensive analysis of a sample of 20 starburst galaxies that show a substantial population of very young massive stars, most of them classified as Wolf-Rayet galaxies. Methods. In this paper, the last in the series, we analyze the global properties of our galaxy sample using multiwavelength data extracted from our own observations (Hα fluxes, B and H-band magnitudes) and from the literature, which include X-ray, FUV, FIR, and radio (both H i spectral line and 1.4 GHz radio-continuum) measurements.Results. The agreement between our Hα-based star-formation rates (Sfr) and those provided by indicators at other wavelengths is remarkable, but we consider that the new Hα-based calibration provided by Calzetti et al. (2007, ApJ, 666, 870) should be preferred to older calibrations. The FUV-based Sfr provides a powerful tool for analyzing the star-formation activity on both global and local scales independently to the Hα emission. We provide empirical relationships between the ionized gas mass, neutral gas mass, dust mass, stellar mass, and dynamical mass with the B-luminosity. Although all mass estimations increase with increasing luminosity, we find important deviations to the general trend in some objects, which seem to be the consequence of their particular evolutionary histories. The analysis of the mass-to-light ratios give similar results. We investigate the mass-metallicity relations and conclude that both the nature and the star-formation history are needed to understand the relationships between both properties. The majority of the galaxies follow a Schmidt-Kennicutt scaling law of star-formation that agrees with that reported in individual star-forming regions within M 51 but not with that found in normal spiral galaxies. Dwarf galaxies seem to be forming stars more efficiently than the outskirts of spiral galaxies. We find a relation between the reddening coefficient and the warm dust mass indicating that the extinction is mainly internal to the galaxies. The comparison with the closed-box model also indicates that the environment has strongly affected their evolution. Conclusions. Considering all multiwavelength data, we found that 17 up to 20 galaxies are clearly interacting or merging with lowluminosity dwarf objects or H i clouds. The remaining three galaxies (Mkn 5, SBS 1054+364, and SBS 1415+437) show considerable divergences of some properties when comparing with similar objects. Many of the interacting/merging features are only detected when deep optical spectroscopy and a detailed multiwavelength analysis, including H i observations, are obtained. We conclude that interactions do play a fundamental role in the triggering mechanism of the strong star-formation activity observed in dwarf starburst galaxies.

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Section: Fuv Datasupporting

confidence: 64%

Massive star formation in Wolf-Rayet galaxies

López-Sánchez

2010

A&A

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“…This confirms the result of the PISCeS survey that most of their galaxies were found in the northward direction. The opposite situation is observed in the M 83 subgroup where the MJB15 candidates are preferentially found southward of M 83 in the direction of Cen A. Intriguingly, even when looking on the galactic scale there is evidence of asymmetry, such as the lopsided distribution of star-forming regions in the outer disk of M83 with a large number detected on the southern side and only a few on the northern side as evident in deep GALEX images (Thilker et al 2005). Is this a hint of some kind of dwarf galaxy substructure between the two main galaxies, possibly a filament of dwarf galaxy infall, or an extension of the Cen A plane?…”

Section: Galaxy Distributionmentioning

confidence: 91%

New low surface brightness dwarf galaxies in the Centaurus group

Müller

Jerjen

Binggeli

2016

A&A

101

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Context. The distribution of satellite galaxies around the Milky Way and Andromeda and their correlation in phase space pose a major challenge to the standard ΛCDM model of structure formation. Other nearby groups of galaxies are now being scrutinized to test for the ubiquity of the phenomenon. Aims. We conducted an extensive CCD imaging survey for faint, unresolved dwarf galaxies of very low surface brightness in the whole Centaurus group region, encompassing the Cen A and M 83 subgroups lying at a distance of roughly 4 and 5 Mpc, respectively. The aim is to significantly increase the sample of known Centaurus group members down to a fainter level of completeness, serving as a basis for future studies of the 3D structure of the group. Methods. Following our previous survey of 60 square degrees covering the M 83 subgroup, we extended and completed our survey of the Centaurus group region by imaging another 500 square degrees area in the g and r bands with the wide-field Dark Energy Survey camera at the 4 m Blanco telescope at CTIO. The surface brightness limit reached for unresolved dwarf galaxies is µ r ≈ 29 mag arcsec −2 . The faintest suspected Centaurus members found have m r ≈ 19.5 mag or M r ≈ −8.8 mag at the mean distance of the group. The images were enhanced using different filtering techniques. Results. We found 41 new dwarf galaxy candidates, which together with the previously discovered 16 dwarf candidates in the M 83 subgroup amounts to almost a doubling of the number of known galaxies in the Centaurus complex, if the candidates are confirmed. We carried out surface photometry in g and r, and report the photometric parameters derived therefrom, for all new candidates as well as previously known members in the surveyed area. The photometric properties of the candidates, when compared to those of Local Group dwarfs and previously known Centaurus dwarfs, suggest membership in the Centaurus group. The sky distribution of the new objects is generally following a common envelope around the Cen A and M 83 subgroups. How the new dwarfs are connected to the intriguing double-planar feature recently reported must await distance information for the candidates.

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“…Numerous bright H ii regions have a high covering factor, especially along the two arms, out to R $ 290 00 . There the H distribution is largely truncated, as pointed out by Kennicutt (1989) and Martin & Kennicutt (2001), while the UV light profile shows no truncation ( Thilker et al 2005). However, a few fainter H ii regions can be seen out to the edge of our frame.…”

Section: Appendix a Flux Calibration Relationsmentioning

confidence: 91%

The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results

Meurer

Hanish

Ferguson

et al. 2006

ASTROPHYS J SUPPL S

Self Cite

182

148

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We introduce the Survey for Ionization in Neutral Gas Galaxies (SINGG), a census of star formation in H iselected galaxies. The survey consists of H and R-band imaging of a sample of 468 galaxies selected from the H i Parkes All Sky Survey ( HIPASS). The sample spans three decades in H i mass and is free of many of the biases that affect other star-forming galaxy samples. We present the criteria for sample selection, list the entire sample, discuss our observational techniques, and describe the data reduction and calibration methods. This paper focuses on 93 SINGG targets whose observations have been fully reduced and analyzed to date. The majority of these show a single emission line galaxy (ELG). We see multiple ELGs in 13 fields, with up to four ELGs in a single field. All of the targets in this sample are detected in H , indicating that dormant (non-star-forming) galaxies with M H i k 3 ; 10 7 M are very rare. A database of the measured global properties of the ELGs is presented. The ELG sample spans 4 orders of magnitude in luminosity ( H and R band), and H surface brightness, nearly 3 orders of magnitude in R surface brightness and nearly 2 orders of magnitude in H equivalent width ( EW ). The surface brightness distribution of our sample is broader than that of the Sloan Digital Sky Survey (SDSS) spectroscopic sample, the EW distribution is broader than prism-selected samples, and the morphologies found include all common types of star-forming galaxies (e.g., irregular, spiral, blue compact dwarf, starbursts, merging and colliding systems, and even residual star formation in S0 and Sa spirals). Thus, SINGG presents a superior census of star formation in the local universe suitable for further studies ranging from the analysis of H ii regions to determination of the local cosmic star formation rate density.

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Recent Star Formation in the Extreme Outer Disk of M83

Cited by 280 publications

References 21 publications

Massive star formation in Wolf-Rayet galaxies

Massive star formation in Wolf-Rayet galaxies

New low surface brightness dwarf galaxies in the Centaurus group

The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results

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