YCAA Logo
YCAA Logo
The Crab Nebula in Blue and White Credit & Copyright: Jay Gallagher (U. Wisc.),
The Crab Nebula in Blue and White Credit & Copyright: Jay Gallagher (U. Wisc.),
Interstellar Dust-Bunnies of NGC 891 Credit: C. Howk & B. Savage (Wisconsin);
Interstellar Dust-Bunnies of NGC 891 Credit: C. Howk & B. Savage (Wisconsin);
Hubble. Credit: R. Williams (STScI), the Hubble Deep Field-South Team, and NASA
Hubble. Credit: R. Williams (STScI), the Hubble Deep Field-South Team, and NASA
Dumbell. Credit & (c): Michael Pierce (Indiana U.) et al., WIYN, AURA, NOAO, NSF
Dumbell. Credit & (c): Michael Pierce (Indiana U.) et al., WIYN, AURA, NOAO, NSF
Abell 39.    (c): George Jacoby (WIYN Obs.) et al., WIYN, AURA, NOAO, NSF
Abell 39. (c): George Jacoby (WIYN Obs.) et al., WIYN, AURA, NOAO, NSF
Bubbling. Credit: Jeffrey Kenney (Yale) et al., WFPC2, HST NASA
Bubbling. Credit: Jeffrey Kenney (Yale) et al., WFPC2, HST NASA

Mailing Address

Yale Center for Astronomy and Astrophysics
Physics Department
P.O. Box 208120
New Haven, CT 06520-8120

Campus Address

260 Whitney Avenue
454 J.W. Gibbs Laboratory

Telephone: (203) 432-3392

Fax: 203) 432-3824

E-mail: ycaa@yale.edu

Upcoming YCAA Seminars

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Updated: 5 hours 10 min ago

YCAA Seminar: Naveen Reddy, University of California, Riverside Title:"Mearurements of the Dust Attenuation Curve at Redshifts z~1.4-2.6 from the MOSFIRE Deep Evolution Field (MOSDEF) Survey" - Tue, September 30, 2014

5 hours 10 min ago
When: Tuesday, September 30, 2014 2:30 PM - 3:30 PM
Where:
   Bass Center for Molecular and Structural Biology (BASS), 305 BASS
   266 Whitney Ave., New Haven, CT 06511
   (Location is wheelchair accessible)
   Tea will be served at 2:00pm in the hallway outside BASS 305
Tags: astrophysics, science, seminar, talk

Speaker/Performer: Assistant Professor Naveen Reddy

Description: Abstract: I will present results on the dust attenuation curve of
redshift z~2 galaxies using early results from the MOSFIRE Deep
Evolution Field (MOSDEF) survey. Our sample consists of 112
star-forming galaxies with nebular spectroscopic redshifts in the
range z = 1.36 − 2.59 and high S/N measurements of the Hα and
Hβ emission lines obtained with the MOSFIRE spectrograph on the
Keck I telescope. Coupled with deep multi-wavelength photometry,
we investigate the impact of dust attenuation on the stellar continuum
and, by constructing composite spectral energy distributions (SEDs)
of galaxies in bins of specific star-formation rate (SFR/M∗) and Balmer
optical depth, we provide the first direct constraints on the shape of the
dust attenuation curve over the full wavelength range from the UV
through near-IR at high redshift. Our results imply an attenuation
curve that is similar in shape to the SMC extinction curve at wavelengths
λ > 2500 Angstroms, and exhibits a rise in the UV that is steeper than that
of the starburst attenuation curve of Calzetti et al. (2000) and shallower
than that of the SMC extinction curve. I will discuss the implications for
these differences in the attenuation curve for the stellar populations
and star-formation rates of high-redshift galaxies.

Open To: General Public
Contact Information:
   Laurelyn Celone
   
   laurelyn.celone@yale.edu
   

YCAA Seminar: Andrew Hearin, Yale University, Title: The Dark side of Galaxy Evolution" - Tue, September 23, 2014

Tue, 09/23/2014 - 6:20am
When: Tuesday, September 23, 2014 2:30 PM - 3:30 PM
Where:
   Bass Center for Molecular and Structural Biology (BASS), 305 BASS
   266 Whitney Ave., New Haven, CT 06511
   (Location is wheelchair accessible)
   Tea will be served at 2:00pm in the hallway outside BASS 305
Tags: astrophysics, science, seminar, talk

Speaker/Performer: YCAA Prize Postdoctoral Fellow Andrew Hearin

Description: Abstract: In this talk, I review the basic physical picture of galaxy formation offered by empirical models connecting galaxies to the dark matter halos they live in. I show that many of the well-established trends in galaxy evolution can be understood through quite simple models of the galaxy-halo connection. I will give examples of how these simple models can be employed to constrain cosmological parameters, as well as how they inform more complex semi-analytical models of galaxy formation and state-of-the-art hydrodynamical simulations. However, recent observational and theoretical developments have revealed that the traditional approach to the galaxy-halo connection is too simplistic to reliably model observed trends in star-formation and quenching at low redshift. This inadequacy presents a new challenge both to the theory of large-scale structure, and to the precision cosmology program. I conclude by outlining a plan for the path towards a new generation of galaxy-halo models, so that we may reap the benefits of deep and wide-field galaxy surveys to robustly constrain cosmological parameters with measurements of large-scale structure, and to develop a more complete picture of galaxy evolution.

Open To: General Public
Contact Information:
   Laurelyn Celone
   
   laurelyn.celone@yale.edu
   

YCAA Seminar: Shirley Ho, Carnegie Mellon University, Title: How to Learn to Love the BOSS" - Tue, September 16, 2014

Tue, 09/16/2014 - 6:25am
When: Tuesday, September 16, 2014 2:30 PM - 3:30 PM
Where:
   Bass Center for Molecular and Structural Biology (BASS), 305 BASS
   266 Whitney Ave., New Haven, CT 06511
   (Location is wheelchair accessible)
   Tea will be served at 2:00pm in the hallway outside BASS 305
Tags: astrophysics, science, seminar, talk

Speaker/Performer: Professor Shirley Ho

Description: Abstract: Baryon Oscillations Spectroscopic Survey have just finished surveying 10,000 square degrees, containing over 1 million galaxies within the redshift range of 0.2
Open To: General Public
Contact Information:
   Laurelyn Celone
   
   laurelyn.celone@yale.edu
   

Special YCAA Seminar: "Measuring AGN Inner Structure and General Relativistic Effects with NuStar" Guido Risaliti - Thu, July 17, 2014

Thu, 07/17/2014 - 5:45am
When: Thursday, July 17, 2014 2:00 PM
Where:
   J.W. Gibbs Laboratory, 164 JWG
   260 Whitney Ave., New Haven, CT 06520-8120
   (Location is wheelchair accessible)
Tags: astrophysics, science, seminar, talk

Speaker/Performer: Guido Risaliti

Description: Abstract:I will show the latest results from the NuSTAR observing program of bright AGN, focusing on measurements of general relativistic effects. I will show how precise BH spin measurements are possible for AGN with strong reflection continua, with and without simultaneous XMM-Newton observations. I will also discuss some preliminary analysis of the structure and size of the X-ray emitting corona, estimated through self-consistent disk+corona emission models.

Open To: General Public
Contact Information:
   Laurelyn Celone
   
   laurelyn.celone@yale.edu
   

Joint Weak Interaction Discussion Group/Nuclear Particle Astrophysics Seminar: Jeff Cherwinka, University of Wisconsin Physical Sciences Lab, "Building IceCube, A Neutrino Telescope at the South Pole" - Fri, June 13, 2014

Fri, 06/13/2014 - 4:51am
When: Friday, June 13, 2014 12:00 PM - 1:00 PM
Where:
   Sloane Physics Laboratory (SPL), 3rd Floor Lounge
   217 Prospect St., New Haven, CT 06511
   (Location is wheelchair accessible)
Tags: astrophysics, interactions, nuclear_physics, science, seminar, talk

Speaker/Performer: Jeff Cherwinka, University of Wisconsin Physical Sciences Lab

Description: An introduction to the IceCube detector with a layman's view of how it works, and some science topics it was built to address. Building the detector involved instrumenting a cubic kilometer of ice with over 5000 light sensors. Installation of these sensors required drilling 86 holes in the ice 1.5 mile deep to deploy the Digital Optical Modules ~14" in diameter. Details of the drill equipment, drilling operations, and deployment will be described.

Contact Information:
   Karsten Heeger
   
   karsten.heeger@yale.edu