GHOSTS M101 using Resolved Stars 70 kpc g =30 mag/'' 2 F9 F8 F5 - - PowerPoint PPT Presentation

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Sep 06, 2022 244 likes •300 views

Quantifying the Faint Outskirts of GHOSTS M101 using Resolved Stars 70 kpc g =30 mag/'' 2 F9 F8 F5 F1 F4 F7 F6 F2 F3 g-band, Dragonfly array In Sung Jang (AIP) Roelof de Jong Benne Holwerda Antonela Monachesi Eric Bell Jeremy

SLIDE 1

GHOSTS

Quantifying the Faint Outskirts of M101 using Resolved Stars

In Sung Jang (AIP) Antonela Monachesi Roelof de Jong Eric Bell Benne Holwerda Jeremy Bailin

g-band, Dragonfly array

µg=30 mag/''2 F1 F2 F3 F4 F5 F6 F7 F8 F9

70 kpc

SLIDE 2

F1 F2 F3 F4 F5 F6 F7 F8 F9

F606W - F814W F814W F606W - F814W F814W F606W - F814W F814W East side F606W - F814W F814W Empty fields (e.g. HDF) West side North-East side

CMDs of resolved stars

SLIDE 3

Radial profiles

Resolved RGB stars (HST) Integrated light (Dragonfly)

F5 F6 F7 F8 F9 F1 F2 F3 F4

SLIDE 4

Star count Integrated light

Modeling the M101 Halo

✓ Two component fits :

An exponential disk .
A power law halo (α=-3).

✓ The Entire region & the West side : Slight excess at the outer region. ✓ Resolved stars + Integrated light ✓ Integrated light only (Merritt+16)

Mhalo/Mgal = ~ 0.5 %

(α =-2~-4) Mhalo,>5Rh/Mgal = 0.04±0.08%

SLIDE 5

/ <Titel (bitte ebenso wie das Datum unter "Einfügen/Kopf-Fußzeile" anpassen)>

We compare the halo properties of M101 with those of the six GHOSTS survey galaxies as well as the Milky Way and M31 and find that M101 has an anemic stellar halo similar to the Milky Way.

Comparison with observed halos and models

The M101 halo marks the low mass & metallicity end of the

bserved halos, but agrees with the model predictions.

MW M81 N4565 N891 N253 M31 N7814 N4945 MW M81 N4565 N7814 M31 N4945 N891 N253