Dwarf Galaxy Survey with Amateur Telescopes (DGSAT) Behnam - PowerPoint PPT Presentation

Dwarf Galaxy Survey with Amateur Telescopes 
 (DGSAT) Behnam Javanmardi 
 School of Astronomy Stellar halos across the cosmos, MPIA, Heidelberg, July 2018 Javanmardi et al. (2016)

DGSAT Christian Henkel 
 David Martinez-Delgado 
 Pavel Kroupa 
 (Bonn) (Heidelberg) (Bonn) + a network of amateur astronomers Telescopes: ~ 50 cm Wide field deep images 5 sigma 
 Ken Crawford Limiting Surface Brightness: 
 Karel Teuwen ~28 mag/arcsec^2 
 R. Jay Gabany Hanson, M. (for ~4 arcsec apertures) Fabian Neyer Rancho Del Sol Observatory, California 2 Behnam Javanmardi, IPM (SoA)

The Local Group ~ 2.5 Mpc Behnam Javanmardi, Promotionskolloquium 3 Credit: Wikipedia

The Local Group The Bulge-Mass vs. Satellite-Number Kroupa et al. (2010) ~ 2.5 Mpc Behnam Javanmardi, Promotionskolloquium 3 Credit: Wikipedia

Bulge Mass vs. Number of Satellites Bulge Bulge-less galaxy Disk 4 Behnam Javanmardi, IPM (SoA)

Bulge Mass vs. Number of Satellites Dark Matter Halo 4 Behnam Javanmardi, IPM (SoA)

Bulge Mass vs. Number of Satellites Dark Matter Halo 4 Behnam Javanmardi, IPM (SoA)

Bulge Mass vs. Number of Satellites Dark Matter Halo Galaxies with and without bulge but with similar rotation velocity (hence similar dark matter halo mass) are expected to have similar number of satellites. A correlation between bulge mass and number of satellites seems not be emerged in the standard scenario (should be investigated further). 4 Behnam Javanmardi, IPM (SoA)

D = The number of tidal dwarf satellite galaxies in dependence of bulge index 0—no bulge 
 1—just noticeable bulge 
 s 2—obvious bulge 
 3—dominant bulge Lopez-Corredoira & Kroupa (ApJ, 817, 75, 2016) 5 Behnam Javanmardi, IPM (SoA) = 2 < - 3

D = The number of tidal dwarf satellite galaxies in dependence of bulge index 0—no bulge 
 1—just noticeable bulge 
 Spiral galaxies 
 s 2—obvious bulge 
 with similar 
 3—dominant bulge luminosities 
 in the SDSS Lopez-Corredoira & Kroupa (ApJ, 817, 75, 2016) 5 Behnam Javanmardi, IPM (SoA) = 2 < - 3

D = The number of tidal dwarf satellite galaxies in dependence of bulge index 5sigma Correlation 0—no bulge 
 1—just noticeable bulge 
 Spiral galaxies 
 s 2—obvious bulge 
 with similar 
 3—dominant bulge luminosities 
 in the SDSS Lopez-Corredoira & Kroupa (ApJ, 817, 75, 2016) 5 Behnam Javanmardi, IPM (SoA) = 2 < - 3

DGSAT NGC7814-DGSAT-3 NGC7814-DGSAT-5 NGC7814-DGSAT-2 NGC 2683 
 NGC7814-DGSAT-4 d~10 Mpc NGC7814 NGC 7814 
 d~ 16 Mpc NGC7814-DGSAT-6 NGC7814-DGSAT-1 NGC7814-DGSAT-7 5 kpc 20 kpc 1.4 deg 
 1.4 deg 
 ~260 kpc ~390 kpc Javanmardi et al. (2016) Henkel, Javanmardi, et al (2017) 6 Behnam Javanmardi, IPM (SoA)

Discovered dwarf galaxy candidates (Henkel, Javanmardi et al. 2017) 7 Behnam Javanmardi, IPM (SoA)

Discovered dwarf galaxy candidates (Henkel, Javanmardi et al. 2017) Number of Milky-Way-like galaxies field of which was observed 
 by the DGSAT so far: 8 7 Behnam Javanmardi, IPM (SoA)

Discovered dwarf galaxy candidates (Henkel, Javanmardi et al. 2017) Number of Milky-Way-like galaxies field of which was observed 
 by the DGSAT so far: 8 Number of new LSB galaxies discovered by the DGSAT so far: 13 7 Behnam Javanmardi, IPM (SoA)

Discovered dwarf galaxy candidates (Henkel, Javanmardi et al. 2017) Number of Milky-Way-like galaxies field of which was observed 
 by the DGSAT so far: 8 Number of new LSB galaxies discovered by the DGSAT so far: 13 Total number of LSB galaxies observed by the DGSAT so far: 33 7 Behnam Javanmardi, IPM (SoA)

Summary The Bulge-Mass vs. Satellite-Number? Kroupa et al. (2010) 8 Behnam Javanmardi, IPM (SoA)

Summary DGSAT The Bulge-Mass vs. Satellite-Number? Kroupa et al. (2010) Rancho Del Sol Observatory, California 8 Behnam Javanmardi, IPM (SoA)

Summary DGSAT The Bulge-Mass vs. Satellite-Number? Kroupa et al. (2010) Rancho Del Sol Observatory, California DGSAT I (arXiv:1511.04446) 
 DGSAT II (arXiv:1703.05356) 8 Behnam Javanmardi, IPM (SoA)