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Title: ANGULAR MOMENTUM AND GALAXY FORMATION REVISITED: EFFECTS OF VARIABLE MASS-TO-LIGHT RATIOS

Abstract

We rederive the relation between the specific angular momentum j {sub *} and the mass M {sub *} of the stellar matter in galaxies of different morphological types. This is a revision of the j {sub *}-M {sub *} diagram presented in our recent comprehensive study of galactic angular momentum. In that work, we estimated j {sub *} from kinematic and photometric data that extended to large radii and M {sub *} from near-infrared luminosities L{sub K} with an assumed universal mass-to-light ratio M {sub *}/L{sub K} . However, recent stellar population models show large variations in M {sub *}/L{sub K} correlated with B – V color. In the present work, we use this correlation to estimate M {sub *}/L{sub K} and hence M {sub *} from the measured B – V and L{sub K} . Our revised j {sub *}-M {sub *} diagram is similar to our previous one; both disk-dominated and elliptical galaxies follow nearly parallel sequences with j{sub ⋆}∝M{sub ⋆}{sup α} and α = 0.6 ± 0.1. However, the offset between the sequences is now a factor of about 5, some 30% larger than before (and close to the offset found by Fall in 1983). Thus, ourmore » new results place even tighter constraints on the loss of specific angular momentum by galactic disks over their lifetimes.« less

Authors:
 [1];  [2]
  1. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  2. Department of Physics and Astronomy, San José State University, One Washington Square, San Jose, CA 95192 (United States)
Publication Date:
OSTI Identifier:
22364147
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 769; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; ASTRONOMY; ASTROPHYSICS; COLOR; CORRELATIONS; DIAGRAMS; GALAXIES; LIFETIME; LIMITING VALUES; LUMINOSITY; MASS; NEAR INFRARED RADIATION; STARS; VARIATIONS; VISIBLE RADIATION

Citation Formats

Fall, S. Michael, and Romanowsky, Aaron J. ANGULAR MOMENTUM AND GALAXY FORMATION REVISITED: EFFECTS OF VARIABLE MASS-TO-LIGHT RATIOS. United States: N. p., 2013. Web. doi:10.1088/2041-8205/769/2/L26.
Fall, S. Michael, & Romanowsky, Aaron J. ANGULAR MOMENTUM AND GALAXY FORMATION REVISITED: EFFECTS OF VARIABLE MASS-TO-LIGHT RATIOS. United States. https://doi.org/10.1088/2041-8205/769/2/L26
Fall, S. Michael, and Romanowsky, Aaron J. Sat . "ANGULAR MOMENTUM AND GALAXY FORMATION REVISITED: EFFECTS OF VARIABLE MASS-TO-LIGHT RATIOS". United States. https://doi.org/10.1088/2041-8205/769/2/L26.
@article{osti_22364147,
title = {ANGULAR MOMENTUM AND GALAXY FORMATION REVISITED: EFFECTS OF VARIABLE MASS-TO-LIGHT RATIOS},
author = {Fall, S. Michael and Romanowsky, Aaron J.},
abstractNote = {We rederive the relation between the specific angular momentum j {sub *} and the mass M {sub *} of the stellar matter in galaxies of different morphological types. This is a revision of the j {sub *}-M {sub *} diagram presented in our recent comprehensive study of galactic angular momentum. In that work, we estimated j {sub *} from kinematic and photometric data that extended to large radii and M {sub *} from near-infrared luminosities L{sub K} with an assumed universal mass-to-light ratio M {sub *}/L{sub K} . However, recent stellar population models show large variations in M {sub *}/L{sub K} correlated with B – V color. In the present work, we use this correlation to estimate M {sub *}/L{sub K} and hence M {sub *} from the measured B – V and L{sub K} . Our revised j {sub *}-M {sub *} diagram is similar to our previous one; both disk-dominated and elliptical galaxies follow nearly parallel sequences with j{sub ⋆}∝M{sub ⋆}{sup α} and α = 0.6 ± 0.1. However, the offset between the sequences is now a factor of about 5, some 30% larger than before (and close to the offset found by Fall in 1983). Thus, our new results place even tighter constraints on the loss of specific angular momentum by galactic disks over their lifetimes.},
doi = {10.1088/2041-8205/769/2/L26},
url = {https://www.osti.gov/biblio/22364147}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 769,
place = {United States},
year = {2013},
month = {6}
}