spirals in virgo - chandra x-ray observatory · r soria –20 years of chandra –dec 2019 6...
TRANSCRIPT
Roberto Soria(UCAS/NAOC)
Spirals in Virgo
Main contributors for this talk:
Mari Kolehmainen, Christian Motch (Strasbourg)
Alister Graham, Ben Davis (Swinburne)
Doug Swartz (NASA/MSFC)
Tom Maccarone (Texas Tech)
Laura Ferrarese (NRC Canada)
Alessandro Boselli (LAM Marseille)
2
Design features of our survey
Gallery of pretty pictures
Main results: ULXs and nuclear BHs
R Soria – 20 Years of Chandra – Dec 2019
Outline
320 Years of Chandra – Dec 2019
M87
420 Years of Chandra – Dec 2019HI map of Chandra spirals (Chung et al 2009)
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Virgo Ellipticals and Spirals
100 early-type galaxies:AMUSE survey (Gallo, Treu, Plotkin,…)Chandra + HST
74 spiral galaxies:our new survey (various papers in prep.)Chandra + NGVS
HI map of Chandra spirals (Chung et al 2009)
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X-rays: Chandra Large Project (PI Soria)
550 ks + archival data
74 spirals with SFR >~ 0.3 Msun/yrPoint-source detection limit ~ 3E38 erg/s
Optical: Next Generation Virgo Cluster Survey
(Ferrarese, Cote’, Lancon, et al)104 square degrees observed with CFHT Megaprime
Point-source detection limit g’ ~ 25.7 ABmag
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Virgo Ellipticals and Spirals
Red = elliptical galaxies in the AMUSE survey
Blue = spiral galaxies in our survey
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Sa, Sab Sb, Sbc Sc, Scd Sd, Sm, Im
Hubble types of our 74 spirals
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Mass distributionof the 74 spirals
Comparison with the mass distributionof the E galaxies in the AMUSE sample (Plotkin et al. 2014)
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M58
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M58
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M61
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M61
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M88
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M88
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M90
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M90
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M90
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M99
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M90
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M100
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M100
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M100
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M100
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NGC 4435NGC 4438
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NGC 4435NGC 4438
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NGC 4567NGC 4568
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NGC 4567NGC 4568
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NGC 4568
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NGC 4568
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NGC 4647
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NGC 4647
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NGC 4647M60
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NGC 4647M60
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ULX luminosity functions
Ellipticals (AMUSE)
Spirals
M = 6E12 Msun
M = 1.7E12 Msun
(Kolehmainen et al 2020, Plotkin et al 2014)
SFR ~ 110 +/- 10 Msun/yr
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ULX luminosity functions
M = 1.7E12 Msun
Ellipticals (AMUSE)
Spirals
(Kolehmainen et al 2020, Plotkin et al 2014)
SFR ~ 110 +/- 10 Msun/yr
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Galaxies dominated by LMXBs or HMXBs?
(Kolehmainen et al 2020)
log SFR/M*
LX ~ SFR
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Nuclear BH activity
Eddington ratio as a function of Hubble type
Resolve nuclear BH from nuclear starburst
Evidence of nuclear BHs in bulgeless galaxies
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NGC 4216
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NGC 4216
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NGC 4216
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NGC 4536
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NGC 4536
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NGC 4527
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NGC 4527
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NGC 4654
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NGC 4654
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NGC 4654
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Sa, Sab Sb, Sbc Sc, Scd Sd, Sm, Im
Fraction of nuclei > 3e38 erg/s
Active fraction ~ 30% for the AMUSE sample (Gallo et al 2010, Plotkin et al 2014)
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Search for IMBHs in the nuclei of bulgeless spirals
Three proxies for nuclear BH masses
MBH—s relation
MBH—M* relation
MBH—f relation (pitch angle relation)
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Search for IMBHs in the nuclei of bulgeless spirals
Small pitch angle = tightly wound arms = high BH mass (Graham et al 2018, Davis et al 2017)
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Search for IMBHs in the nuclei of bulgeless spirals
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NGC 4178
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NGC 4178
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NGC 4178
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NGC 4178
Nuclear IMBHM ~ 1E4 Msun?
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Best candidate: satellite dwarf near the nucleus of NGC 4424?
Search for IMBHs in the nuclei of accreted dwarfs
HST residual image
Chandra source
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Search for IMBHs in the nuclei of accreted dwarfs
Best candidate: satellite dwarf near the nucleus of NGC 4424
VESTIGE Ha survey(Boselli et al.)
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M99
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M99M99
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M88
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M88
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Summary
ULXs and nuclear BHs in Virgo spirals
Comparison with results for ellipticals
Coming soon: - association with globular clusters, UCDs- Ha counterparts (VESTIGE survey)- search for ULX radio bubbles
Search for IMBHs