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About AGN ionization echoes, thermal echoes and ionization deficits in low-redshift Ly alpha blobs

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dc.contributor.authorSchirmer, Mischa
dc.contributor.authorMalhotra, Sangeeta
dc.contributor.authorLevenson, Nancy A.
dc.contributor.authorFu, Hai
dc.contributor.authorDavies, Rebecca L.
dc.contributor.authorKeel, William C.
dc.contributor.authorTorrey, Paul
dc.contributor.authorBennert, Vardha N.
dc.contributor.authorPancoast, Anna
dc.contributor.authorTurner, James E. H.
dc.contributor.otherArizona State University
dc.contributor.otherArizona State University-Tempe
dc.contributor.otherUniversity of Iowa
dc.contributor.otherAustralian National University
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherHarvard University
dc.contributor.otherSmithsonian Astrophysical Observatory
dc.contributor.otherSmithsonian Institution
dc.contributor.otherMassachusetts Institute of Technology (MIT)
dc.contributor.otherCalifornia State University System
dc.contributor.otherCalifornia Polytechnic State University San Luis Obispo
dc.date.accessioned2018-09-24T19:24:33Z
dc.date.available2018-09-24T19:24:33Z
dc.date.issued2016-07-28
dc.description.abstractWe report the discovery of 14 Ly alpha blobs (LABs) at z similar to 0.3, existing at least 4-7 billion years later in the Universe than all other LABs known. Their optical diameters are 20-70 kpc, and GALEX data imply Ly alpha luminosities of (0.4-6.3) x 10(43) erg s(-1). Contrary to high-z LABs, they live in low-density areas. They are ionized by AGN, suggesting that cold accretion streams as a power source must deplete between z = 2 and 0.3. We also show that transient AGN naturally explain the ionization deficits observed in many LABs. Their Ly alpha and X-ray fluxes decorrelate below less than or similar to 10(6) years because of the delayed escape of resonantly scattering Ly alpha photons. High Ly alpha luminosities do not require currently powerful AGN, independent of obscuration. Chandra X-ray data reveal intrinsically weak AGN, confirming the luminous optical nebulae as impressive ionization echoes. For the first time, we also report mid-infrared thermal echoes from the dusty tori. We conclude that the AGN have faded by three to four orders of magnitude within the last 10(4-5) years, leaving fossil UV, optical and thermal radiation behind. The host galaxies belong to the group of previously discovered Green Bean galaxies (GBs). Gemini optical imaging reveals smooth spheres, mergers, spectacular outflows and ionization cones. Because of their proximity and high flux densities, GBs are perfect targets to study AGN feedback, mode switching and the Ly alpha escape. The fully calibrated, co-added optical FITS images are publicly available.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationSchirmer, M., et al. (2016): About AGN Ionization Echoes, Thermal, Echoes, and Iionization Deficits in Low-Redshift Lyα Blobs. Monthly Notices of the Royal Astronomical Society, 463(2). DOI: https://doi.org/10.1093/mnras/stw1819
dc.identifier.doi10.1093/mnras/stw1819
dc.identifier.orcidhttps://orcid.org/0000-0002-3324-4824
dc.identifier.orcidhttps://orcid.org/0000-0003-2568-9994
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3946
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.rights.licenseAttribution-NonCommercial 4.0 International (CC BY-NC 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.subjectradiative transfer
dc.subjectgalaxies: active
dc.subjectgalaxies: evolution
dc.subjectultraviolet: galaxies
dc.subjectACTIVE GALACTIC NUCLEI
dc.subjectDIGITAL SKY SURVEY
dc.subjectSTAR-FORMING GALAXIES
dc.subjectBLACK-HOLE ACCRETION
dc.subjectNARROW-LINE REGION
dc.subjectGREEN PEA GALAXIES
dc.subjectSTELLAR POPULATION SYNTHESIS
dc.subjectFAR-ULTRAVIOLET OBSERVATIONS
dc.subjectSEYFERT 2 GALAXIES
dc.subjectBROAD-BAND SURVEY
dc.subjectAstronomy & Astrophysics
dc.titleAbout AGN ionization echoes, thermal echoes and ionization deficits in low-redshift Ly alpha blobsen_US
dc.title.alternativeAbout AGN Ionization Echoes, Thermal, Echoes, and Ionization Deficits in Low-Redshift Lyman-alpha Blobsen_US
dc.typetext
dc.typeArticle

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