Physical properties of superbubbles in the Antennae galaxies

Camps-Fariña, A.; Zaragoza-Cardiel, J.; Beckman, J. E.; Font, J.; Velázquez, P. F.; Rodríguez-González, A.; Rosado, M.

doi:10.1093/mnras/stx551

Cited by 6 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vreeswijk et al 2013). These scales are comparable to the sizes of large ionized superbubbles around star-forming regions in the low redshift universe (Oey & Clarke 1997;Camps-Fariña et al 2017), and so might indicate that absorption takes place due to neutral gas piled up at the boundaries of such bubbles for some GRBs. In any case, this tendency towards high column-densities is potentially a problem since if the EUV escape fraction is to fulfil the requirements for reionization, a significant proportion of GRBs should have very low H i columns (log(N H i /cm −2 ) ≪ 18), particularly at z > 5.…”

mentioning

confidence: 92%

The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium

Tanvir

Fynbo

Postigo

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The part played by stars in the ionization of the intergalactic medium (IGM) remains an open question. A key issue is the proportion of the stellar ionizing radiation that escapes the galaxies in which it is produced. Spectroscopy of gamma-ray burst (GRB) afterglows can be used to determine the neutral hydrogen column-density, N H i , in their host galaxies and hence the opacity to extreme ultra-violet (EUV) radiation along the lines-of-sight to the bursts. Thus, making the reasonable assumption that longduration GRB locations are representative of the sites of massive stars that dominate EUV production, one can calculate an average escape fraction of ionizing radiation in a way that is independent of galaxy size, luminosity or underlying spectrum. Here we present a sample of N H i measures for 138 GRBs in the range 1.6 < z < 6.7 and use it to establish an average escape fraction at the Lyman limit of f esc ≈ 0.005, with a 98% confidence upper limit of f esc ≈ 0.015. This analysis suggests that stars provide a small contribution to the ionizing radiation budget of the IGM at z < 5, where the bulk of the bursts lie. At higher redshifts, z > 5, firm conclusions are limited by the small size of the GRB sample (7/138), but any decline in average H i column-density seems to be modest. We also find no indication of a significant correlation of N H i with galaxy UV luminosity or host stellar mass, for the subset of events for which these are available. We discuss in some detail a number of selection effects and potential biases. Drawing on a range of evidence we argue that such effects, while not negligible, are unlikely to produce systematic errors (in either direction) of more than a factor ∼ 2 in f esc , and so would not affect the primary conclusions. Given that many GRB hosts are low metallicity, high specific star-formation rate, dwarf galaxies, these results present a particular problem for the hypothesis that such galaxies dominated the reionization of the universe.

show abstract

mentioning

confidence: 92%

The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium

Tanvir

Fynbo

Postigo

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…Bubbles and superbubbles have been detected in the Galaxy and nearby galaxies. (Camps-Fariña et al 2017). Bubbles blown by massive stars contain fast stellar winds (T > 10 6 K) which emits diffuse X-rays and a swept-up dense shell (Chu et al 2006).…”

Section: Resultsmentioning

confidence: 99%

Origin of Hot Bubble in NGC 6822 Hubble V Star-Forming Region

Lee¹,

Lim³

et al. 2018

Proc. IAU

View full text Add to dashboard Cite

We observed a bright H II complex, Hubble V in NGC 6822, using the high-resolution near-infrared spectrograph IGRINS (R = 45,000) attached on the 2.7 m telescope at the McDonald Observatory. We carried out a spectral mapping over a 15″ × 18″ region in the H and K bands using a slit-scanning technique. The emission lines Brγ and He i from ionized regions as well as molecular hydrogen lines from photo-dissociation regions (PDRs), were detected. We show three-dimensional maps of the emission lines and discuss the possibility of an expanding hot bubble structure within which many ionized components are around the central stellar cluster.

show abstract

“…SNe-driven outflows can occur when multiple SNes are correlated in space and time such that the SNRs overlap and create superbubbles in the ISM [16,17]. These superbubbles can grow large enough to break out of the ISM disk and enable outflows of SNR material to escape into the CGM at velocities of up to several hundred km s -1 [18]. Another mechanism by which SNe-driven outflows can drive material into the IGM occurs if the SN explodes in a region of the galaxy where the ISM is very thin.…”

Section: Fig 1 Snbw Pressure Versus Distance Plotmentioning

confidence: 99%

Supernova Plasma Effects on Extragalactic Light Fields

Marko¹

2022

Preprint

View full text Add to dashboard Cite

Simulations based on Supernova (SN) observations predict several galactic SN explosions (SNe) occur every century. Unlike SNes within the Interstellar Medium (ISM) where ambient gas generally absorbs blast waves within a million years, SNes occurring in a rarified environment outside of the (ISM) generate blast waves which remain in a high velocity free expansion phase for more extended periods. The SN blast wave forms an expanding spherical shell and when multiple blast waves intersect, the overlapping region naturally takes the form of a ring, an arc, or an Einstein Cross structure. The analysis shows the high velocity plasma establishes a medium with permeability which drives the index of refraction greater than 1. As a result, when a shock discontinuity forms in the overlapping region, light is reflected from the host galaxy which exposes the intersecting blast wave regions. The expanding shells are shown to induce an achromatic redshift to the reflected light consistent with those measured for gravitational lenses. Further, it is shown that a Hubble equation for a blast wave around the Milky Way Galaxy can be parameterized to align with measured redshifts of extragalactic light fields over a wide range of distances.

show abstract

Physical properties of superbubbles in the Antennae galaxies

Cited by 6 publications

References 50 publications

The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium

The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium

Origin of Hot Bubble in NGC 6822 Hubble V Star-Forming Region

Supernova Plasma Effects on Extragalactic Light Fields

Contact Info

Product

Resources

About