Recent Star Formation in the Extreme Outer Disk of M83

By D. Thilker, L. Bianchi, S. Boissier, A. G. de Paz, B. Madore, D. Martin, G. Meurer, S. Neff, R. Rich, David Schiminovich and 17 more. 2004

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Ultraviolet imaging with the Galaxy Evolution Explorer (GALEX) has revealed an extensive sample of UV-bright stellar complexes in the extreme outer disk of M83, extending to about 4 times the radius at which the majority of H II regions are detected (R = 5.′1, or 6.6 kpc). These sources are typically associated with large-scale filamentary H I structures in the warped outer disk of M83 and are distributed beyond the galactocentric radii at which molecular interstellar medium has yet been detected. We present measured properties of these stellar complexes, including far-UV and near-UV magnitudes and local gas surface density. Only a subset of the outer-disk UV sources have corresponding H II regions detected in Hα imaging, consistent with a sample of mixed age in which some sources are a few megayears old and others are much more evolved (~108 yr).

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/34d09284b70b72ddc76b622176d710d2d4e3da92

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THE SPATIALLY RESOLVED STAR FORMATION LAW FROM INTEGRAL FIELD SPECTROSCOPY: VIRUS-P OBSERVATIONS OF NGC 5194 (2009, background): “…the detection of widespread UV emission beyond the Hα brightness profile cutoff in the outer disks of many nearby galaxies (Gil de Paz et al. 2005; Thilker et al. 2005; Boissier et al. 2007) , has raised questions about the proportionality between the Hα emission and the SFR in the low…”
Radial Variation of Attenuation and Star Formation in the Largest Late-Type Disks Observed with GALEX (2006, background): “…often used with the same meaning as “attenuation”. the UV also shows us low levels of star formation (XUV galaxies, e.g. Gil de Paz et al. 2005; Thilker et al. 2005), in regions with such low dust content that the far-infrared emission is undetected by IRAS, and that the UV is likely to be…”
A Search for Extended Ultraviolet Disk (XUV-Disk) Galaxies in the Local Universe (2007, background): “This originally suggested to us (Thilker et al. 2005b) that anti-truncated disks might be the evolved counterparts of XUV-disks.”
Star Formation in the Milky Way and Nearby Galaxies (2012, background): “In exceptional cases (e.g., NGC5236=M83, NGC4625) the star formation extends to 3–4 times the normal R25 optical radius, to the edge of the HI disk (Thilker et al. 2005; Gil de Paz et al. 2005).”
Beyond Inside-Out Growth: Formation and Evolution of Disk Outskirts (2007, background): “Furthermore, the discovery of UV emission at radii well beyond the Hα emission cutoff (Gil de Paz et al. 2005; Thilker et al. 2005, 2007), the observational evidence for inside-out disk growth (Muñoz-Mateos et al. 2007), and detections of disk breaks in the distant universe (Pérez 2004; Trujillo…”
Misaligned angular momentum in hydrodynamic cosmological simulations: warps, outer discs and thick discs (2010, background): “Recent results from GALEX show faint UV emission in the warped discs of M83 (Thilker et al. 2005) and NGC 5055 (Thilker et al. 2007; Sancisi et al. 2008), implying that a low level of star-formation also exists in those warps.”
Outer structure of the Galactic warp and flare: explaining the Canis Major over-density (2006, unknown): “Thilker et al. (2005) GALEX imaging the outer disk of M83, shows current star formation at up to threeRHolmberg in the warped outer disk of M83.”
The structure of galactic disks - Studying late-type spiral galaxies using SDSS (2006, background): “However, there is compelling evidence of star-formation inthe far outer regions of spiral galaxies (e.g. Ferguson et al., 1998; Cuillandre et al., 2001; Thilker et al., 2005; Gil de Paz et al., 2005), well beyond the break of the observed broken exponential structure (Pohlen et al., 2002).”
EXTREMELY INEFFICIENT STAR FORMATION IN THE OUTER DISKS OF NEARBY GALAXIES (2010, background): “— continued. tures in the outer disk (e.g., Thilker et al. 2005).”
Discovery of an Extended Ultraviolet Disk in the Nearby Galaxy NGC 4625 (2005, background): “Early results indicate that the presence of a large Hi disk is a necessary but not sufficient condition for the XUV emission to be present (Thilker et al. 2005b, in prep.).”
A GALEX ULTRAVIOLET IMAGING SURVEY OF GALAXIES IN THE LOCAL VOLUME (2010, background): “For example, an early surprise from the mission was the detection of FUV emission extending to several times the optical disks of the nearby systems M83 (Thilker et al. 2005) and NGC 4625 (Gil de Paz et al. 2005), and it was reported that the amount and extent of the star formation in these “XUV-dis”
The GALEX Ultraviolet Atlas of Nearby Galaxies (2006, background): “Also in galaxies showing obvious extended UVemission (XUV; Thilker et al. 2005; Gil de Paz et al. 2005b) the morphological class is preceded by the letter ‘‘x’’ (extended).”