Zobrazeno 1 - 10
of 127
pro vyhledávání: '"Sheth, R. K."'
We study systematics associated with estimating simple stellar population (SSP) parameters -- age, metallicity [M/H], $\alpha$-enhancement [$\alpha$/Fe] and IMF shape -- and associated $M_*/L$ gradients, of elliptical slow rotators (E-SRs), fast rota
Externí odkaz:
http://arxiv.org/abs/2211.05800
Autor:
Bernardi, M., Sheth, R. K., Sanchez, H. Dominguez, Margalef-Bentabol, B., Bizyaev, D., Lane, R. R.
Gradients in the stellar populations (SP) of galaxies -- e.g., in age, metallicity, stellar Initial Mass Function (IMF) -- can result in gradients in the stellar mass to light ratio, $M_*/L$. Such gradients imply that the distribution of the stellar
Externí odkaz:
http://arxiv.org/abs/2201.07810
This is the third paper of a series where we study the stellar population gradients (SP; ages, metallicities, $\alpha$-element abundance ratios and stellar initial mass functions) of early type galaxies (ETGs) at $z\le 0.08$ from the MaNGA-DR15 surve
Externí odkaz:
http://arxiv.org/abs/2005.07693
Early-type galaxies -- slow and fast rotating ellipticals (E-SRs and E-FRs) and S0s/lenticulars -- define a Fundamental Plane (FP) in the space of half-light radius $R_e$, enclosed surface brightness $I_e$ and velocity dispersion $\sigma_e$. Since $I
Externí odkaz:
http://arxiv.org/abs/2004.07847
Autor:
Pandey, S., Baxter, E. J., Xu, Z., Orlowski-Scherer, J., Zhu, N., Lidz, A., Aguirre, J., DeRose, J., Devlin, M., Hill, J. C., Jain, B., Sheth, R. K., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Castander, F. J., Cawthon, R., da Costa, L. N., De Vicente, J., Desai, S., Diehl, H. T., Dietrich, J. P., Doel, P., Evrard, A. E., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gerdes, D. W., Giannantonio, T., Gruendl, R. A., Gschwend, J., Hartley, W. G., Hollowood, D. L., James, D. J., Krause, E., Kuehn, K., Kuropatkin, N., Maia, M. A. G., Marshall, J. L., Melchior, P., Menanteau, F., Miquel, R., Plazas, A. A., Roodman, A., Sanchez, E., Serrano, S., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M. E. C., Tarle, G., Wechsler, R. H.
Publikováno v:
Phys. Rev. D 100, 063519 (2019)
An understanding of astrophysical feedback is important for constraining models of galaxy formation and for extracting cosmological information from current and future weak lensing surveys. The thermal Sunyaev-Zel'dovich effect, quantified via the Co
Externí odkaz:
http://arxiv.org/abs/1904.13347
We estimate ages, metallicities, $\alpha$-element abundance ratios and stellar initial mass functions of elliptical (E) and S0 galaxies from the MaNGA-DR15 survey. We stack spectra and use a variety of single stellar population synthesis models to in
Externí odkaz:
http://arxiv.org/abs/1904.11992
We present estimates of stellar population (SP) gradients from stacked spectra of slow (SR) and fast (FR) rotator elliptical galaxies from the MaNGA-DR15 survey. We find that: 1) FRs are $\sim 5$ Gyrs younger, more metal rich, less $\alpha$-enhanced
Externí odkaz:
http://arxiv.org/abs/1904.11996
Autor:
Bernardi, M., Sheth, R. K., Dominguez-Sanchez, H., Fischer, J. -L., Chae, K. -H., Huertas-Company, M., Shankar, F.
Within a galaxy the stellar mass-to-light ratio $\Upsilon_*$ is not constant. Spatially resolved kinematics of nearby early-type galaxies suggest that allowing for a variable initial mass function (IMF) returns significantly larger $\Upsilon_*$ gradi
Externí odkaz:
http://arxiv.org/abs/1712.05414
Autor:
Bernardi, M., Sheth, R. K., Fischer, J. -L., Meert, A., Chae, K. -H., Dominguez-Sanchez, H., Huertas-Company, M., Shankar, F., Vikram, V.
Spatially resolved kinematics of nearby galaxies has shown that the ratio of dynamical- to stellar population-based estimates of the mass of a galaxy ($M_*^{\rm JAM}/M_*$) correlates with $\sigma_e$, if $M_*$ is estimated using the same IMF for all g
Externí odkaz:
http://arxiv.org/abs/1710.07296
Autor:
Bernardi, M., Fischer, J. -L., Sheth, R. K., Meert, A., Huertas-Company, M., Shankar, F., Vikram, V.
The Sloan Digital Sky Survey pipeline photometry underestimates the brightnesses of the most luminous galaxies. This is mainly because (i) the SDSS overestimates the sky background and (ii) single or two-component Sersic-based models better fit the s
Externí odkaz:
http://arxiv.org/abs/1702.08527