The Arecibo Galaxy Environment Survey IX: the isolated galaxy sample

Minchin, R. F.; Auld, Robbie Richard; Davies, Jonathan Ivor; Караченцев, И. Д.; Keenan, Olivia; Momjian, Emmanuel; Rodríguez, R.; Taber, Tory; Taylor, R.

doi:10.1093/mnras/stv2557

Cited by 5 publications

(7 citation statements)

References 39 publications

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“…A total of ∼30 000 galaxies are expected to be detected. The first galaxy catalogs are Giovanelli et al (2007), Saintonge et al (2008), Kent et al (2008), Martin et al (2009), Stierwalt et al (2009), the subsequent α.40 catalog (Haynes et al 2011) Cortese et al (2008), Irwin et al (2009), Minchin et al (2010, Davies et al (2011), Taylor et al (2012, 2014a, Minchin et al (2016), Keenan et al (2016); 4. GASS: pointed survey at the Arecibo 305 m telescope (Catinella et al 2012) of 666 galaxies with stellar masses greater than 10 10 M selected from the SDSS spectroscopic and the Galaxy Evolution Explorer (GALEX) ultraviolet imaging surveys.…”

Section: Introductionmentioning

confidence: 99%

NIBLES: an H I census of stellar mass selected SDSS galaxies

Driel

Butcher

Schneider

et al. 2016

A&A

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To investigate galaxy properties as a function of their total stellar mass, we obtained 21 cm H i line observations at the 100-m class Nançay Radio Telescope of 2839 galaxies from the Sloan Digital Sky Survey (SDSS) in the Local Volume (900 < cz < 12 000 km s −1 ), dubbed the Nançay Interstellar Baryons Legacy Extragalactic Survey (NIBLES) sample. They were selected evenly over their entire range of absolute SDSS z-band magnitudes (M z ∼ −13.5 to −24 mag), which were used as a proxy for their stellar masses. In this paper, a first, global presentation of the observations and basic results is given; their further analysis will be presented in other papers in this series. The galaxies were originally selected based on their properties, as listed in SDSS DR5. Comparing this photometry to their total H i masses, we noted that, for a few percent, the SDSS magnitudes appeared severely misunderestimated, as confirmed by our re-measurements for selected objects. Although using the later DR9 results eliminated this problem in most cases, 384 still required manual photometric source selection. Usable H i spectra were obtained for 2600 of the galaxies, of which 1733 (67%) were clearly detected and 174 (7%) marginally. The spectra for 241 other observed galaxies could not be used for further analysis owing to problems with either the H i or the SDSS data. We reached the target number of about 150 sources per half-magnitude bin over the M z range −16.5 to −23 mag. Down to −21 mag the overall detection rate is rather constant at the ∼75% level but it starts to decline steadily towards the 30% level at −23 mag. Making regression fits by comparing total H i and stellar masses for our sample, including our conservatively estimated H i upper limits for non-detections, we find the relationship log(M H I /M ) = −0.59 log(M ) + 5.05, which lies significantly below the relationship found in the M H I /M -M plane when only using H i detections.

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Section: Introductionmentioning

confidence: 99%

NIBLES: an H I census of stellar mass selected SDSS galaxies

Driel

Butcher

Schneider

et al. 2016

A&A

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“…NGC 5523 is a globally isolated galaxy (Karachentsev et al (2011); Minchin et al (2016)) in which we find possible evidence for past interactions with neighboring galaxies. This observation contradicts the simplifying assumption that isolated galaxies form and evolve with minimal interactions from other galaxies (Kapferer et al (2005)).…”

Section: Discussionmentioning

confidence: 84%

“…NGC 5523 is an apparently normal late-type isolated spiral galaxy (Karachentsev et al (2011); Minchin et al (2016)) with structural properties indicative of galaxy-galaxy interactions. While isolated galaxies are often considered to evolve with minimal interactions from surrounding galaxies (Jog & Combes (2009)), we show that NGC 5523 offers a potential counterexample to this assumption.…”

Section: Introductionmentioning

confidence: 99%

“…A detailed study of NGC 5523 has been conducted in which Minchin et al (2016) conclude that NGC 5523 shows no evidence for recent interactions based on its Hydrogen I (HI) line profile. Minchin et al reach this conclusion by investigating companion candidates near NGC 5523 and ultimately find that no companions exist within 300 kpc of NGC 5523.…”

Section: Introductionmentioning

confidence: 99%

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NGC 5523: An isolated product of soft galaxy mergers?

Fulmer

Gallagher

Kotulla

2017

A&A

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Multi-band images of the very isolated spiral galaxy NGC 5523 show a number of unusual features consistent with NGC 5523 having experienced a significant merger: (1) Near-infrared (NIR) images from the Spitzer Space Telescope (SST) and the WIYN 3.5-m telescope reveal a nucleated bulge-like structure embedded in a spiral disk. (2) The bulge is offset by ∼1.8 kpc from a brightness minimum at the center of the optically bright inner disk. (3) A tidal stream, possibly associated with an ongoing satellite interaction, extends from the nucleated bulge along the disk. We interpret these properties as the results of one or more non-disruptive mergers between NGC 5523 and companion galaxies or satellites, raising the possibility that some galaxies become isolated because they have merged with former companions. 0

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“…Could such asymmetrical features be due to internal processes ? Unfortunately comparable studies of isolated galaxies are very rare (three isolated galaxies were targeted with AGES, none of which show extensions -see Minchin et al 2016). Even then, the authors can seldom (if ever) rule out external processes (e.g.…”

Section: Alternative Explanationsmentioning

confidence: 99%

Faint and Fading Tails: The Fate of Stripped H i Gas in Virgo Cluster Galaxies

Taylor

Köppen

Jáchym

et al. 2020

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Although many galaxies in the Virgo cluster are known to have lost significant amounts of Hi gas, only about a dozen features are known where the Hi extends significantly outside its parent galaxy. Previous numerical simulations have predicted that Hi removed by ram pressure stripping should have column densities far in excess of the sensitivity limits of observational surveys. We construct a simple model to try and quantify how many streams we might expect to detect. This accounts for the expected random orientation of the streams in position and velocity space as well as the expected stream length and mass of stripped Hi. Using archival data from the Arecibo Galaxy Environment Survey, we search for any streams which might previously have been missed in earlier analyses. We report the confident detection of ten streams as well as sixteen other less sure detections. We show that these well-match our analytic predictions for which galaxies should be actively losing gas, however the mass of the streams is typically far below the amount of missing Hi in their parent galaxies, implying that a phase change and/or dispersal renders the gas undetectable. By estimating the orbital timescales we estimate that dissolution rates of 1-10 M ⊙ yr −1 are able to explain both the presence of a few long, massive streams and the greater number of shorter, less massive features.

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The Arecibo Galaxy Environment Survey IX: the isolated galaxy sample

Cited by 5 publications

References 39 publications

NIBLES: an H I census of stellar mass selected SDSS galaxies

NIBLES: an H I census of stellar mass selected SDSS galaxies

NGC 5523: An isolated product of soft galaxy mergers?

Faint and Fading Tails: The Fate of Stripped H i Gas in Virgo Cluster Galaxies

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