Research output: Contribution to journal › Article › peer-review
The structure of the Milky Way based on unWISE 3.4 μm integrated photometry. / Mosenkov, Aleksandr V.; Savchenko, Sergey S. ; Smirnov, Anton A.; Camps, Peter.
In: Monthly Notices of the Royal Astronomical Society, Vol. 507, No. 4, 01.11.2021, p. 5246-5263.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The structure of the Milky Way based on unWISE 3.4 μm integrated photometry
AU - Mosenkov, Aleksandr V.
AU - Savchenko, Sergey S.
AU - Smirnov, Anton A.
AU - Camps, Peter
PY - 2021/11/1
Y1 - 2021/11/1
N2 - We present a detailed analysis of the Galaxy structure using an unWISE wide-field image at 3.4μm. We perform a 3D photometric decomposition of the Milky Way taking into account (i) the projection of the Galaxy on the celestial sphere and (ii) that the observer is located within the Galaxy at the solar radius. We consider a large set of photometric models starting with a pure disc model and ending with a complex model that consists of thin and thick discs plus a boxy-peanut-shaped bulge. In our final model, we incorporate many observed features of the Milky Way, such as the disc flaring and warping, several overdensities in the plane, and the dust extinction. The model of the bulge with the corresponding X-shape structure is obtained from N-body simulations of a Milky Way-like galaxy. This allows us to retrieve the parameters of the aforementioned stellar components, estimate their contribution to the total Galaxy luminosity, and constrain the position angle of the bar. The mass of the thick disc in our models is estimated to be 0.4–1.3 of that for the thin disc. The results of our decomposition can be directly compared to those obtained for external galaxies via multicomponent photometric decomposition.
AB - We present a detailed analysis of the Galaxy structure using an unWISE wide-field image at 3.4μm. We perform a 3D photometric decomposition of the Milky Way taking into account (i) the projection of the Galaxy on the celestial sphere and (ii) that the observer is located within the Galaxy at the solar radius. We consider a large set of photometric models starting with a pure disc model and ending with a complex model that consists of thin and thick discs plus a boxy-peanut-shaped bulge. In our final model, we incorporate many observed features of the Milky Way, such as the disc flaring and warping, several overdensities in the plane, and the dust extinction. The model of the bulge with the corresponding X-shape structure is obtained from N-body simulations of a Milky Way-like galaxy. This allows us to retrieve the parameters of the aforementioned stellar components, estimate their contribution to the total Galaxy luminosity, and constrain the position angle of the bar. The mass of the thick disc in our models is estimated to be 0.4–1.3 of that for the thin disc. The results of our decomposition can be directly compared to those obtained for external galaxies via multicomponent photometric decomposition.
KW - Galaxy: bulge
KW - Galaxy: disc
KW - Galaxy: formation
KW - Galaxy: fundamental parameters
KW - Galaxy: structure
KW - THICK DISKS
KW - SURFACE PHOTOMETRY
KW - DARK-MATTER UNIVERSE
KW - ON SPIRAL GALAXIES
KW - INSIDE-OUT FORMATION
KW - INFRARED-EMISSION
KW - RED CLUMP
KW - DIGITAL SKY SURVEY
KW - X-SHAPED STRUCTURES
KW - GALACTIC DISC
UR - https://ui.adsabs.harvard.edu/abs/2021MNRAS.507.5246M/abstract
UR - http://www.scopus.com/inward/record.url?scp=85117210414&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/2e755b00-2c14-3396-b0ae-80979777bc68/
U2 - 10.1093/mnras/stab2445
DO - 10.1093/mnras/stab2445
M3 - Article
VL - 507
SP - 5246
EP - 5263
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 4
ER -
ID: 86606897