eÖtvÖs university budapest department of physics of complex systems photometric parallax...
TRANSCRIPT
![Page 1: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/1.jpg)
EÖTVÖS UNIVERSITY BUDAPEST
Department of Physics of Complex Systems
Photometric parallax estimation using the MILES catalog and BaSeL models
Photometric parallax estimation using the MILES catalog and BaSeL models
István CsabaiLászló DobosMárton TrencsényiNorbert PurgerGéza Herczeg
István CsabaiLászló DobosMárton TrencsényiNorbert PurgerGéza Herczeg
GYÖNGYI KEREKES
MAGPOP MEETING, MALTA
April 20, 2023
GYÖNGYI KEREKES
MAGPOP MEETING, MALTA
April 20, 2023
![Page 2: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/2.jpg)
PHOTOMETRIC PARALLAX
• Based on different distance measurements for stars:o Trigonometric parallax (nearest stars)o Main sequence fitting (open clusters)o Cepheid variable stars (globular clusters), etc.
• Calculation of absolute magnitudes• Color-magnitude diagram• Main sequence fitting with a function
• If we know the color index of a star, we can estimate the distance.
![Page 3: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/3.jpg)
PHOTOMETRIC PARALLAX
Problems:• We can only estimate for main sequence stars• Color indices are metallicity-dependent (especially
B, V)• We need continuous parameters• Hawley, 2002
(spectroscopic parallax)
![Page 4: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/4.jpg)
PHOTOMETRIC PARALLAX ESTIMATIONS
Juric et al, 2005 THE MILKY WAY TOMOGRAPHY WITH SDSS
![Page 5: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/5.jpg)
OUR CONCEPTION
![Page 6: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/6.jpg)
MILES DATABASE
• 985 stars • Wavelength range: 3525 – 7500 Å
at 2.3 Å spectral resolution• Atmospheric data estimated using CEN01b
(Teff, log g, [Fe/H])
![Page 7: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/7.jpg)
MILES DATABASE
Teff vs log g
Large range of atmospheric parameters: from metal-rich, cool stars to hot, metal-poor stars.
Cenarro et al, 2006
![Page 8: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/8.jpg)
HIPPARCOS
• Trigonometric parallax• About 130.000 stars• Error: 0.7-0.9 mas for stars brighter than
9 mag
![Page 9: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/9.jpg)
MILES – HIPPARCOS CROSSMATCH
• Based on coordinates (40 arcsec) 614 stars
• HRD[V>10]
![Page 10: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/10.jpg)
MILES – HIPPARCOS CROSSMATCH
• CMD
![Page 11: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/11.jpg)
BASEL MODEL
• Used for fitting: 2 735 spectra• Method: least χ2 • Spectra fitted:
χ2=0.344
χ2=3.578
χ2=11.886
![Page 12: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/12.jpg)
SPECTRA FITTING
• Cut at χ2 = 3• Result:
562 stars
![Page 13: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/13.jpg)
SPECTRA FITTING
![Page 14: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/14.jpg)
SYNTHETIC MAGNITUDES
• u’, g’, r’, i’, z’ (Sloan filters)
[Fukugita et al, 1996]
![Page 15: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/15.jpg)
SYNTHETIC MAGNITUDES
Jester et al. 2005 filter transformation equations:
g=V+0.64(B-V)-0.13
r=V-0.46(B-V)+0.11
![Page 16: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/16.jpg)
COLOR-COLOR DIAGRAMS
g – r vs r – i for 100 000 Sloan stars (red dots) and for MILES stars (green crosses)
r – i
g –
r
SDSS stars selection:
Relative error in magnitudes < 0.04%
Magnitudes in range [14;17]
Upper CCD from Michael Richmond
![Page 17: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/17.jpg)
COLOR-COLOR DIAGRAMS
u-g vs g-r for 100 000 Sloan stars (red dots) and for MILES stars (green crosses)
![Page 18: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/18.jpg)
OUR ESTIMATION
• We have code for nonparametric estimation (multidimensional indexing integrated with databases)
• It was created for photometric redshift calculation and estimation of physical parameters of galaxies
• This code can be adapted for photometric parallax estimation: 5-D (4 CI & M) spaces nearest neighbour searching absolute manitude & parallax estimation
![Page 19: EÖTVÖS UNIVERSITY BUDAPEST Department of Physics of Complex Systems Photometric parallax estimation using the MILES catalog and BaSeL models István Csabai](https://reader036.vdocument.in/reader036/viewer/2022062517/56649f305503460f94c4a78a/html5/thumbnails/19.jpg)
FUTURE TASKS