Millimeter VLBI of NGC1052: Pinpointing a Supermassive Black Hole

Transcription

1 Millimeter VLBI of NGC52: Pinpointing a Supermassive Black Hole Anne-Kathrin Baczko,2,3 In Collaboration with: R. Schulz 2,3,4, E. Ros 3,4, M. Kadler, M. Perucho 4, J. Wilms MPIfR, Bonn; 2 Remeis Obs. Bamberg & ECAP Erlangen; 3 Univ. Würzburg; 4 Univ. València; 5 ASTRON, Dwingeloo, NL Max-Planck-Institut für Radioastronomie May 3, 26 ASTRO WÜRZBURG

2 Table of Contents Introduction the LINER galaxy NGC 52 2 Results mm VLBI observations of NGC GHz : Twin-jet with highest resolution 43 GHz : Kinematics of NGC GHz : Magnetic field estimate 3 Summary 4 Outlook

3 Introduction the LINER galaxy NGC 52 NGC52 M87 Distance 2 Mpc 6.7 Mpc BH mass M 8.2 M M 9.8 ( ) M Inclination angle close to ( ) ( ) Gebhardt & Thomas 29 (ApJ 7,2), ( ) Acciari et al. 29 (Science 325,444) Baczko et al. 26 (A&A in press, ArXiv 65.7) Emission region < 2 R S Hada et al. 2 (Nature 477,85): Central engine within 4 23 R S of the 7mm-core Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 3 / 6

4 Introduction the LINER galaxy NGC 52 Radio properties of NGC 52 Kadler et al. 24 (A&A 426, 48) Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 4 / 6

5 Results mm VLBI observations of NGC GHz : Twin-jet with highest resolution The Global mm-vlbi Array (GMVA) Observation on 9/ October 24 Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 5 / 6

6 Results mm VLBI observations of NGC GHz : Twin-jet with highest resolution First detection of the twin-jet system of NGC 52 at 86 GHz Baczko et al. 26 (A&A in press) NGC 52 GMVA 86 GHz Uniform weighted beam: (353 58) µas 2 resolution in east-west direction: 6.5 ltd Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 6 / 6

7 Results mm VLBI observations of NGC GHz : Kinematics of NGC 52 The Morphology at 86 and 43 GHz Tapered image at 86 GHz October 24 Stacked image at 43 GHz Relative DEC [mas] Flux Density [Jy/beam] NGC 52 GMVA 86 GHz Relative Distance [mas] Flux Density [mjy/beam] Relative DEC [mas] Flux Density [Jy/beam] NGC52 43 GHz Stacked Relative Distance [mas] Flux Density [mjy/beam] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 7 / 6

8 Results mm VLBI observations of NGC GHz : Kinematics of NGC 52 Detailed analysis at 43 GHz Examples from 4 years of observation with the VLBA (25-29) Date [yr] Date [yr] RA [mas] RA [mas] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 8 / 6

9 Results mm VLBI observations of NGC GHz : Kinematics of NGC 52 Detailed analysis at 43 GHz Examples from 4 years of observation with the VLBA (25-29) Date [yr] Date [yr] RA [mas] RA [mas] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 8 / 6

10 Results mm VLBI observations of NGC GHz : Kinematics of NGC 52 Tracking Moving Emission Features Separation from Core [mas] western jet eastern jet Date [year] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 9 / 6

11 Results mm VLBI observations of NGC GHz : Kinematics of NGC 52 Tracking Moving Emission Features Separation from Core [mas] western jet Block Block 2 Block eastern jet Date [year] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 9 / 6

12 Results mm VLBI observations of NGC GHz : Kinematics of NGC 52 Tracking Moving Emission Features Separation from Core [mas] western jet eastern jet Block Block Date [year] 28 Block Mean jet velocities: β western =.36 ±.3, β eastern =.56 ±.3 29 core wj wj2 wj3 wj4 wj5 wj6 wj7 wj8 wj9 wj wj wj2 wj3 wj4 wj5 ej ej2 ej3 ej4 ej5 ej6 ej7 ej8 ej9 ej ej ej2 ej3 ej4 ej Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 9 / 6

13 Results mm VLBI observations of NGC GHz : Magnetic field estimate.5 NGC 52 GMVA 86 GHz Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 / 6

14 Results mm VLBI observations of NGC GHz : Magnetic field estimate mm Core Jet Base Jet Base mm Core R R R R Relative DEC [mas] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 / 6

15 Results mm VLBI observations of NGC GHz : Magnetic field estimate mm Core Jet Base Jet Base mm Core R R R R Relative DEC [mas] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 / 6

16 mm Core Results mm VLBI observations of NGC 52 Jet Base Jet Base mm Core 86 GHz : Magnetic field estimate Core size estimate Modelfit unresolved R R R R.8.6 Relative DEC [mas] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 2 / 6

17 mm Core Results mm VLBI observations of NGC 52 Jet Base Jet Base mm Core 86 GHz : Magnetic field estimate Core size estimate Modelfit unresolved /2 th beam: 3 µas /5 th beam: 2 µas R R R.6 µas 3 µas R Based on SNR: 8 µas Lobanov (25) Smallest possible: 4 R S =.6 µas.8.6 Relative DEC [mas] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 2 / 6

18 Results mm VLBI observations of NGC GHz : Magnetic field estimate Magnetic field estimates (.6 µas < 2 d < 3 µas) Electrons loose energy while radiating: synchrotron losses ( ) dγ = 4 dt 3 σ u B T m e c γ2 β 2, (2.) Gives cooling time of electrons : t c = B 3/2 [G 2/3 ] s Magnetic field needed for observed synchrotron cooling ( ) 2/3 d[cm] B sc, d = β [cm s ] G, (2.2) s Assuming B r for d > 2 R S & B r 2 for d < 2 R S B Sc, RS d /3 (2.3) Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 3 / 6

19 mm Core Results mm VLBI observations of NGC 52 Jet Base Jet Base mm Core 86 GHz : Magnetic field estimate Core size Magnetic field /2 th beam: 3 µas /5 th beam: 2 µas Based on SNR: 8 µas Lobanov (25) R R R.6 µas 3 µas R Smallest possible: 4 R S =.6 µas.8 Relative DEC [mas] At R S : B Sc, RS d /3 2 G < B Sc, RS < 8 4 G Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 4 / 6

20 Summary r [pc] poloidal 4 toroidal 2 B [G] r [R S ] pc mas Baczko et al. 26 (A&A in press, ArXiv 65.7) Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 5 / 6

21 Outlook Outlook including ALMA including space VLBI NGC52 GMVA Good resolution in E-W direction v [Mλ] 5-5 Adding baselines in N-S direction Better transversal resolution u [Mλ] Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 6 / 6

22 Outlook Outlook including ALMA including space VLBI NGC52 GMVA Good resolution in E-W direction v [Mλ] 5-5 Adding baselines in N-S direction Better transversal resolution u [Mλ] NGC52 GROUND ARRAY NGC52 6 NOV 26.3 cm EVN VLBA GBT VLA LBA RadioAstron Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 6 / 6

23 Outlook Outlook including ALMA including space VLBI NGC52 GMVA Good resolution in E-W direction v [Mλ] 5-5 Adding baselines in N-S direction Better transversal resolution u [Mλ] 3.6 mm VLBA EFLSBERG PDFBURE PICOVEL ONSALA METSAHOVI YEBES GBT ALMA.3 mm APEX JCMT LMT SMTO PdBure Pico Veleta SMA SPT ALMA Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 6 / 6

24 Outlook Outlook including ALMA including space VLBI v [Mλ] NGC52 GMVA u [Mλ] Good resolution in E-W direction Adding baselines in N-S direction Better transversal resolution Test jet formation and collimation on scales of lightdays 3.6 mm VLBA EFLSBERG PDFBURE PICOVEL ONSALA METSAHOVI YEBES GBT ALMA.3 mm APEX JCMT LMT SMTO PdBure Pico Veleta SMA SPT ALMA Anne-Kathrin Baczko (MPIfR) Pinpointing a Supermassive Black Hole Malaga, May 3, 26 6 / 6