Show simple item record

dc.contributor.authorFrye, Brenda L.
dc.contributor.authorBowen, David V.
dc.contributor.authorTripp, Todd M.
dc.contributor.authorJenkins, Edward B.
dc.contributor.authorPettini, Max
dc.contributor.authorEllison, Sara L.
dc.date.accessioned2019-06-13T19:20:49Z
dc.date.available2019-06-13T19:20:49Z
dc.date.issued2019-02-20
dc.identifier.citationBrenda L. Frye et al 2019 ApJ 872 129en_US
dc.identifier.issn1538-4357
dc.identifier.doi10.3847/1538-4357/ab0083
dc.identifier.urihttp://hdl.handle.net/10150/632887
dc.description.abstractUsing Hubble Space Telescope/Space Telescope Imaging Spectrograph G140M spectroscopy, we investigate an absorption-line system at z = 0.07489 in the spectrum of the quasi-stellar object PG 1543+489 (z(QSO) = 0.401). The sightline passes within rho = 66 kpc of an edge-on 2L* disk galaxy at a similar redshift, but the galaxy belongs to a group with four other galaxies within rho = 160 kpc. We detect H I [log N(H I/cm(-2)) = 19.12 +/- 0.04] as well as N I, Mg II, Si II, and Si III, from which we measure a gas-phase abundance of [N/H] = -1.0 +/- 0.1. Photoionization models indicate that the nitrogen-to-silicon relative abundance is solar, yet magnesium is underabundant by a factor of approximate to 2. We also report spatially resolved emission-line spectroscopy of the nearby galaxy, and we extract its rotation curve. The galaxy's metallicity is approximate to 8x higher than [N/H] in the absorber, and interestingly, the absorber velocities suggest that the gas at rho = 66 kpc is corotating with the galaxy's stellar disk, possibly with an inflow component. These characteristics could indicate that this sub-damped Ly alpha absorber system arises in a "cold-accretion" flow. However, the absorber abundance patterns are peculiar. We hypothesize that the gas was ejected from its galaxy of origin (or perhaps is a result of tidal debris from interactions between the group galaxies) with a solar nitrogen abundance, but that subsequently mixed with (and was diluted by) gas in the circumgalactic medium or group. If the gas is bound to the nearby galaxy, this system may be an example of the gas "recycling" predicted by theoretical galaxy simulations. Our hypothesis is testable with future observations.en_US
dc.description.sponsorshipUniversite de Paris-Sud, Institute d'Astrophysique Spatial d'Orsay in 2016; Institute for Advanced Study in Princeton; Space Telescope Science Institute (STScI) [GO-08625.01]; NASA [NAS5-26555]en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/0004-637X/872/i=2/a=129?key=crossref.1351005b04abfba9891855113d576080en_US
dc.rights© 2019. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectgalaxies: halosen_US
dc.subjectintergalactic mediumen_US
dc.subjectquasars: absorption linesen_US
dc.subjectquasars: individual (PG 1543+489)en_US
dc.titleA Sub-damped Ly alpha Absorber with Unusual Abundances: Evidence of Gas Recycling in a Low-redshift Galaxy Groupen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observ, Dept Astronen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume872
dc.source.issue2
dc.source.beginpage129
refterms.dateFOA2019-06-13T19:20:49Z


Files in this item

Thumbnail
Name:
Frye_2019_ApJ_872_129.pdf
Size:
1.400Mb
Format:
PDF
Description:
Final Published version

This item appears in the following Collection(s)

Show simple item record