1 code implementation • 6 Jun 2017 • J. Christopher Howk, Christopher B. Wotta, Michelle A. Berg, Nicolas Lehner, Felix J. Lockman, Zachary Hafen, D. J. Pisano, Claude-Andre Faucher-Giguere, Bart P. Wakker, J. Xavier Prochaska, Spencer A. Wolfe, Joseph Ribaudo, Kathleen A. Barger, Lauren Corlies, Andrew J. Fox, Puragra Guhathakurta, Edward B. Jenkins, Jason Kalirai, John M. O'Meara, Molly S. Peeples, Kyle R. Stewart, Jay Strader
Our non-detections place a limit on the covering factor of such optically-thick gas around M31 to $f_c < 0. 051$ (at 90\% confidence) for $\rho \leq R_{\rm vir}$.
Astrophysics of Galaxies
1 code implementation • 23 Jul 2015 • Katherine M. Hamren, Constance M. Rockosi, Puragra Guhathakurta, Martha L. Boyer, Graeme H. Smith, Julianne J. Dalcanton, Dylan Gregersen, Anil C. Seth, Alexia R. Lewis, Benjamin F. Williams, Elisa Toloba, Leo Girardi, Claire E. Dorman, Karoline M. Gilbert, Daniel R. Weisz
We explore the ratio (C/M) of carbon-rich to oxygen-rich thermally pulsing asymptotic giant branch(TP-AGB) stars in the disk of M31 using a combination of moderate-resolution optical spectroscopy from the Spectroscopic Landscape of Andromeda's Stellar Halo (SPLASH) survey and six-filter Hubble Space Telescope photometry from the Panchromatic Hubble Andromeda Treasury (PHAT) survey. Carbon stars were identified spectroscopically.
Astrophysics of Galaxies
1 code implementation • 12 Feb 2015 • Claire E. Dorman, Puragra Guhathakurta, Anil C. Seth, Daniel R. Weisz, Eric F. Bell, Julianne J. Dalcanton, Karoline M. Gilbert, Katherine M. Hamren, Alexia R. Lewis, Evan D. Skillman, Elisa Toloba, Benjamin F. Williams
In this paper, for the first time, we measure the stellar age-velocity dispersion correlation in the inner 20 kpc (3. 5 disk scale lengths) of M31 and show that it is dramatically different from that in the Milky Way.
Astrophysics of Galaxies
