A Search for Ionized Hydrogen in Globular Clusters

Erkes, J. W.; Philip, A. G. D.

doi:10.1086/153540

Cited by 2 publications

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“…These clusters are associated in direction and velocity with extended Galactic HI emission, and may be spatially associated with the HI. Searches for CO emission have led only to negative results (Troland, Hesser and Heiles 1978;Schneps et al 1978;Sandell et al 1987;Smith et al 1995), as have searches for ionized H using H emission (Smith, Hesser and Shawl 1976;Hesser and Shawl 1977;Smith et al 1990) and radio continuum emission (Hills and Klein 1973;Erkes and Philip 1975;Klein 1976). The observed dispersion measures for globular cluster pulsars also suggest low limits for ionized gas in several clusters (Reynolds 1989;Bhattacharya and Verbunt 1991;Manchester et al 1991;Nordgren et al 1992).…”

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confidence: 99%

Limits on Ionized Gas in Globular Clusters

Knapp¹,

Gunn²,

Bowers³

et al. 1996

ApJ

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Globular clusters are expected to accumulate interstellar gas due to mass loss from their stars. A sensitive search of six clusters for free-free emission from ionized gas at 8.4 GHz using the VLA failed to detect any gas, with limits well below the expected accumulation from mass loss if the gas remains in the cluster. However, simple models of the equilibrium distribution of photoionized gas show that the velocity dispersion of the gas is greater than that of the stars, and beyond

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confidence: 99%

Limits on Ionized Gas in Globular Clusters

Knapp¹,

Gunn²,

Bowers³

et al. 1996

ApJ

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“…Many searches have been carried out over the past several decades using a range of approaches to look for hydrogen gas in and around Milky Way GCs; in general, these studies have had limited success, often resulting in upper limits or ambiguous detections (e.g., Heiles & Henry 1966;Kerr & Knapp 1972;Knapp et al 1973;Erkes & Philip 1975;Birkinshaw et al 1983;Faulkner et al 1991;Freire et al 2001;van Loon et al 2006, and many others). One study of particular relevance is van Loon et al (2009), which was carried out as part of the Galactic Arecibo L-band Feed Array (GALFA) survey.…”

Section: An H I Cloud Near In a Globular Cluster?mentioning

confidence: 99%

A Search for Gas-Rich Dwarf Galaxies in the Local Universe with ALFALFA and the WIYN One Degree Imager

Rhode,

Smith,

Janesh

et al. 2023

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We present results from an optical search for Local Group dwarf galaxy candidates associated with the Ultra-Compact High Velocity Clouds (UCHVCs) discovered by the ALFALFA neutral hydrogen survey. The ALFALFA UCHVCs are isolated, compact H i clouds with projected sizes, velocities, and estimated H i masses that suggest they may be nearby dwarf galaxies, but that have no clear counterpart in existing optical survey data. We observed 26 UCHVCs with the WIYN 3.5 m telescope and One Degree Imager (ODI) in two broadband filters and searched the images for resolved stars with properties that match those of stars in typical dwarf galaxies at distances <2.5 Mpc. We identify one promising dwarf galaxy candidate at a distance of ∼570 kpc associated with the UCHVC AGC 268071, and five other candidates that may deserve additional follow-up. We carry out a detailed analysis of ODI imaging of a UCHVC that is close in both projected distance and radial velocity to the outer-halo Milky Way globular cluster Pal 3. We also use our improved detection methods to reanalyze images of five UCHVCs that were found to have possible optical counterparts during the first phase of the project, and confirm the detection of a possible stellar counterpart to the UCHVC AGC 249525 at an estimated distance of ∼2 Mpc. We compare the optical and H i properties of the dwarf galaxy candidates to the results from recent theoretical simulations that model satellite galaxy populations in group environments, as well as to the observed properties of galaxies in and around the Local Group.

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A Search for Ionized Hydrogen in Globular Clusters

Cited by 2 publications

References 0 publications

Limits on Ionized Gas in Globular Clusters

Limits on Ionized Gas in Globular Clusters

A Search for Gas-Rich Dwarf Galaxies in the Local Universe with ALFALFA and the WIYN One Degree Imager

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