The Nature of galaxie s LIN ER Robert Singh, Glenn - - PowerPoint PPT Presentation

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Mar 08, 2024 324 likes •544 views

The Nature of galaxie s LIN ER Robert Singh, Glenn v. d. Ven & Knud Jahnke CALIFA ~600 galaxies, diameter selected, 0.005<z<0.03 Spatial sampling ~2 0.5-1 kpc Spectral resolution R~850 (v500)/ ~1650

SLIDE 1

The Nature of galaxie

Robert Singh, Glenn v. d. Ven & Knud Jahnke

ER LIN s

SLIDE 2

Robert Singh

CALIFA

~600 galaxies, diameter selected, 0.005<z<0.03
Spatial sampling ~2”≈0.5-1 kpc
Spectral resolution R~850 (v500)/ ~1650 (v1200)
Wavelength coverage 3400 – 7300 Å
3σ limiting surface brightness ~23.0 mag/arcsec2

SLIDE 3

Robert Singh

Low Ionisation Nuclear Emission-line Region
possible ionisation sources:
shocks (mergers, outflows)
general properties:
ld stellar pops
line emission from weakly ionised atoms
fraction with central X-ray
> 50% of the AGN population

ERs LIN

low luminosity AGN
hot old stars (post-AGB)

SLIDE 4

Robert Singh

Hα Hα Hα Hβ [OIII] [OI] [NII] [SII]

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Robert Singh

85,224 SDSS galaxies

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Robert Singh

257 CALIFA galaxies

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Robert Singh

1 CALIFA galaxy

NGC 2916

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BPT maps

Seyfert SF

Robert Singh

SLIDE 9

BPT maps

SF LINER

NGC 5157

Robert Singh

SLIDE 10

ER emission LI

100 10-1 10-2 10-3 101

10 40 20 30

normalised H alpha flux radius [arcsec]

Singh et al. 2013

Robert Singh

N

Singh et al. 2013

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Robert Singh

SDSS

UGC11680

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Robert Singh

BPT map

UGC11680

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Robert Singh

Ha EW map EW

UGC11680

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Robert Singh

Histogram of LINER bins EW [Å]

UGC11680

Ha EW map

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Robert Singh

EW(Ha)

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Robert Singh

star-formation histories

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Robert Singh

Seyfert like emission

star-formation histories

6.76 Gyr

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Robert Singh

LINER like emission

star-formation histories

4.47 Gyr

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Robert Singh

SF & intermediate emission

star-formation histories

3.16 Gyr

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Robert Singh

star-formation histories

log(age)

light weighted

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LINER emission does not imply an AGN origin

Robert Singh

conclusion

Explanation of low-power AGN is not reconcilable with our results.
LINER signatures are not a good tool for finding AGN.
LINERs can host an AGN.
AGN activity does not explain non-nuclear LINER emission.
Ample evidence for hot old stars
spatial extend of LINER like emission
spatial correlation with low EW(Ha)
spatial correlation with older stellar ages