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Blowing in the Milky Way Wind: Neutral Hydrogen Clouds Tracing the Galactic Nuclear Outflow

Di Teodoro, Enrico Maria; McClure-Griffiths, Naomi; Lockman, Felix J.; Denbo, Sara R.; Endsley, Ryan; Ford, H. Alyson; Harrington, Kevin

Description

We present the results of a new sensitive survey of neutral hydrogen above and below the Galactic Center with the Green Bank Telescope. The observations extend up to Galactic latitude |b| < 10° with an effective angular resolution of 9′.5 and an average rms brightness temperature noise of 40 mK in a 1 km s-1 channel. The survey reveals the existence of a population of anomalous high-velocity clouds extending up to heights of about 1.5 kpc from the Galactic plane and showing no signature of...[Show more]

dc.contributor.authorDi Teodoro, Enrico Maria
dc.contributor.authorMcClure-Griffiths, Naomi
dc.contributor.authorLockman, Felix J.
dc.contributor.authorDenbo, Sara R.
dc.contributor.authorEndsley, Ryan
dc.contributor.authorFord, H. Alyson
dc.contributor.authorHarrington, Kevin
dc.date.accessioned2021-04-22T23:57:28Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/230961
dc.description.abstractWe present the results of a new sensitive survey of neutral hydrogen above and below the Galactic Center with the Green Bank Telescope. The observations extend up to Galactic latitude |b| < 10° with an effective angular resolution of 9′.5 and an average rms brightness temperature noise of 40 mK in a 1 km s-1 channel. The survey reveals the existence of a population of anomalous high-velocity clouds extending up to heights of about 1.5 kpc from the Galactic plane and showing no signature of Galactic rotation. These clouds have local standard of rest velocities |VLSR| ≲ 360 km s-1, and assuming a Galactic Center origin, they have sizes of a few tens of parsec and neutral hydrogen masses spanning 10-105 M⊙. Accounting for selection effects, the cloud population is symmetric in longitude, latitude, and VLSR. We model the cloud kinematics in terms of an outflow expanding from the Galactic Center and find the population consistent with being material moving with radial velocity Vw ≃ 330 km s-1 distributed throughout a bicone with opening angle α > 140°. This simple model implies an outflow luminosity Lw > 3 × 1040 erg s-1 over the past 10 Myr, consistent with star formation feedback in the inner region of the Milky Way, with a cold gas mass-loss rate ≲0.1 M⊙ yr-1. These clouds may represent the cold gas component accelerated in the nuclear wind driven by our Galaxy, although some of the derived properties challenge current theoretical models of the entrainment process.
dc.description.sponsorshipE.D.T. and N.M.-G. acknowledge the support of the Australian Research Council (ARC) through grant DP160100723. N.M.-G. acknowledges the support of the ARC through Future Fellowship FT150100024.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherIOP Publishing
dc.rights© 2018 The American Astronomical Society
dc.sourceThe Astrophysical Journal
dc.subjectGalaxy: center
dc.subjectGalaxy: nucleus
dc.subjectISM: clouds
dc.subjectISM: jets and outflows
dc.subjectISM: kinematics and dynamics
dc.titleBlowing in the Milky Way Wind: Neutral Hydrogen Clouds Tracing the Galactic Nuclear Outflow
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume855
dcterms.dateAccepted2018-02-01
dc.date.issued2018-03-05
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020201 - Atomic and Molecular Physics
local.identifier.absfor030699 - Physical Chemistry not elsewhere classified
local.identifier.ariespublicationa383154xPUB9576
local.publisher.urlhttps://iopscience.iop.org/
local.type.statusPublished Version
local.contributor.affiliationDi Teodoro, Enrico, College of Science, ANU
local.contributor.affiliationMcClure-Griffiths, Naomi, College of Science, ANU
local.contributor.affiliationLockman, Felix J., Green Bank Observatory
local.contributor.affiliationDenbo, Sara R., Michigan State University
local.contributor.affiliationEndsley, Ryan, University of Arizona
local.contributor.affiliationFord, H. Alyson, University of Arizona
local.contributor.affiliationHarrington, Kevin, Max-Planck-Institut für Radioastronomie
local.description.embargo2099-12-31
dc.relationhttp://purl.org/au-research/grants/arc/DP160100723
dc.relationhttp://purl.org/au-research/grants/arc/FT150100024
local.bibliographicCitation.issue33
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage16
local.identifier.doi10.3847/1538-4357/aaad6a
dc.date.updated2020-11-23T11:34:56Z
local.identifier.scopusID2-s2.0-85044037597
CollectionsANU Research Publications

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