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Dr. Grant Tremblay

Astrophysicist | Harvard-Smithsonian Center for Astrophysics

 

About Grant

I am an Astrophysicist at the Harvard-Smithsonian Center for Astrophysics. Previously, I was a NASA Einstein Fellow at Yale University, a Fellow in the Directorate for Science at the European Southern Observatory (ESO) near Munich, and an Astronomer at ESO's Very Large Telescope in Chile. Prior to that, I was at the Rochester Institute of Technology, the Space Telescope Science Institute, the Johns Hopkins University, and the University of Rochester. A short bio can be found here

I work on star formation and the dynamics of multiphase gas amid energetic feedback from active galaxies, whose central engines are powered by accreting supermassive black holes. For my functional work, I support the High Resolution Camera (HRC) for NASA's Chandra X-ray Observatory


Download my CV here.
Feel free to email me at gtremblay @ cfa.harvard.edu

Support for my work is provided by the Smithsonian Institution, as well as several grants from the National Aeronautics and Space Administration (NASA),  including Einstein Postdoctoral Fellowship Award Number PF-150128. I have also been funded by NASA Grants stemming from the Hubble Space Telescope, Chandra X-ray Observatory, and Spitzer Space Telescope missions. I am also grateful for partial support from the European Community's Seventh Framework Programme. Views expressed here are entirely my own, and not those of NASA, the Smithsonian, Harvard, Yale, or ESO. 

Press Releases

A new ALMA result in Nature from our team. Click the image below to learn more!


discovery of a unique galaxy in a strong lensing cluster

Our paper was the topic of a Hubblecast and a "Hubble Hangout"

 

Evidence for galaxy-scale fountains pumped by black holes

Profile in the BBC Sky at Night Magazine


Gravitational Wave Kicks Monster Black Hole Out of Galactic Core

This image, taken by NASA's Hubble Space Telescope, reveals an unusual sight: a runaway quasar fleeing from its galaxy's central hub. A quasar is the visible, energetic signature of a black hole. Black holes cannot be observed directly, but they are the energy source at the heart of quasars — intense, compact gushers of radiation that can outshine an entire galaxy. Credits: NASA, ESA, and M. Chiaberge (STScI and JHU)

This image, taken by NASA's Hubble Space Telescope, reveals an unusual sight: a runaway quasar fleeing from its galaxy's central hub. A quasar is the visible, energetic signature of a black hole. Black holes cannot be observed directly, but they are the energy source at the heart of quasars — intense, compact gushers of radiation that can outshine an entire galaxy.

Credits: NASA, ESA, and M. Chiaberge (STScI and JHU)


Starving black hole returns brilliant galaxy to the shadows

Our first press release from the Close AGN Reference Survey (CARS)

In 1984, Markarian 1018 became the first-known "changing look" quasar, converting from a faint, narrow-lined Seyfert 2 to a bright Seyfert 1. The Close AGN Reference Survey (CARS) has now discovered that the galaxy has recently reverted back to a Seyfert 2, retreating to the shadows once more. It is the first such object to go "there and back again". 

In 1984, Markarian 1018 became the first-known "changing look" quasar, converting from a faint, narrow-lined Seyfert 2 to a bright Seyfert 1. The Close AGN Reference Survey (CARS) has now discovered that the galaxy has recently reverted back to a Seyfert 2, retreating to the shadows once more. It is the first such object to go "there and back again". 

Education & Public Outreach

ASTRONOMY ON TAP

Recently, I organized the New Haven Chapter of Astronomy on Tap, and now work on the AoT Boston organizing team. Join us for our awesome forthcoming events!


DOCUMENTARIES

I am appearing in and advising several documentary series this year, including Space's Deepest Secrets (Season 2) and How the Universe Works (Season 6) for the Discovery and Science Channels. These will be on Netflix at some point soon.


recent public events

I recently moderated a Q&A with David Tennant (Dr. Who) before an audience of 5,000 people at Awesome Con in Washington, DC. 

"David Tennant, a man who's pretended to visit the farthest future, will be joined on stage by Dr. Grant Tremblay and Dr. Matthew Shindell, experts who are actually exploring the outer reaches of our galaxy. Together they'll geek out about Dr. Who, what's really out there among the stars, and take questions from fans on life, the Universe, and everything.

INFORMAL WRITING

Some thoughts on science, life, and (astro)policy

These random thoughts may be boring or wrong (sometimes both). They do not, however, reflect the opinion of NASA, the Smithsonian Astrophysical Observatory, Harvard, Yale, ESO, or anyone but myself. 

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Check out our new MUSE integral field spectroscopy of nearby Type 1 AGN.
The data are absolutely stunning. 

Selected Publications

A complete publication list can be found in my CV, at ORCiD, or on the ADSMy PhD thesis can be found here (PDF).  

Testing for Shock-Heated X-ray Gas around Compact Steep Spectrum Radio Galaxies
C. P. O'Dea, D. M. Worrall, G. R. Tremblay, T. E. Clarke, B. Rothberg, S. A. Baum, K. P. Christiansen, C. A. Mullarkey, J. Noel-Storr, & R. Mittal
O'Dea et al. 2017, ApJ in press (arXiv)

The Close AGN Reference Survey (CARS): Mrk 1018 halts dimming and now experiences strong short-term variability
M. Krumpe, B. Husemann, G. R. Tremblay, T. Urrutia, M. Powell, T. A. Davis, J. Scharwaechter, J. Dexter, G. Busch, F. Combes, S. M. Croom, A. Eckart, R. E. McElroy, M. Perez-Torres, & G. Leung
Krumpe et al. 2017, A&A in press (arXiv)

The Close AGN Reference Survey (CARS)
B. Husemann, G. R. Tremblay, T. Davis, G. Busch, R. McElroy, J. Neumann, T. Urrutia, M. Krumpe, J. Scharwaechter, M. Powell, M. Perez-Torrez and the CARS Team
Husemann et al. 2017, The ESO Messenger, 169, 42 (ESO)

Shaken Snow Globes: Kinematic Tracers of the Multiphase Condensation Cascade in Massive Galaxies, Groups, and Clusters
M. Gaspari, M. A. McDonald, S. L. Hamer, F. Brighenti, P. Temi, M. Gendron-Marsolais, J. Hlavacek-Larrondo, A. C. Edge, N. Werner, P. Tozzi, M. Sun, J. M. Stone, G. R. Tremblay, M. T. Hogan, D. Eckert, S. Ettori, H. Yu, V. Biffi, & S. Planelles
Gaspari et al. 2017, submitted to ApJ (arXiv)

Close Entrainment of massive molecular gas flows by radio bubbles in the central galaxy of Abell 1795
H. R. Russell, B. R. McNamara, A. C. Fabian, P. E. J. Nulsen, F. Combes, A. C. Edge, M. T. Hogan, M. McDonald, P. Salome, G. R. Trembay, & A. N. Vantyghem
Russell et al. 2017, MNRAS in press (arXiv)

Cold, Clumpy Accretion onto an Active Supermassive Black Hole
G. R. Tremblay, J. B. Raymond Oonk, F. Combes, P. Salome, C. P. O'Dea, S. A. Baum, G. M. Voit, M. Donahue, B. R. McNamara, T. A. Davis, M. A. McDonald, A. C. Edge, T. E. Clarke, R. Galvan-Madrid, M. N. Bremer, L. Edwards, A. C. Fabian, S. Hamer, Y. Li, A. Maury, H. R. Russell, A. C. Quillen, C. M. Urry, J. S. Sanders, & M. Wise
Tremblay et al. 2016, Nature, 534, 218-221 (Nature | arXiv | ADS | CodePress ReleaseThe Washington Post)

Why Astronomy programs are moving on from the Physics GRE
E. M. Levesque, R. Bezanzon, & G. R. Tremblay
An editorial in Physics Today, 2017

The Effects of Ram Pressure Stripping on the Cold Clouds in the Centers of Galaxy Clusters
Y. Li, M. Ruszkowski, & G. R. Tremblay
Li et al. 2017, ApJ, submitted (arXiv)

The Puzzling Radio Loud QSO 3C 186: A Gravitational Wave Recoiling Black Hole in a Young Radio Source?
M. Chiaberge, J. C. Ely, E. T. Meyer, M. Georganopoulos, A. Marinucci, S. Bianchi, G. R. Tremblay, B. Hilbert, J. P. Kotyla, A. Capetti, S. A. Baum, F. D. Macchetto, G. Miley, C. P. O'Dea, E. S. Perlman, W. B. Sparks, & C. Norman
Chiaberge et al. 2016, A&A, submitted (arXiv | Press Release | Science | Engadget | The Washington Post)

Molecular Gas along a Bright H-alpha Filament in 2A 0335+096 Revealed by ALMA
A. N. Vantyghem, B. R. McNamara, H. R. Russell, M. T. Hogan, A. C. Edge, P. E. J. Nulsen, A. C. Fabian, F. Combes, P. Salome, S. A. Baum, M. Donahue, R. A. Main, N. W. Murray, R. W. O'Connell, C. P. O'Dea, J. B. R. Oonk, I. J. Parrish, J. S. Sanders, & G. R. Tremblay
Vantyghem et al. 2016, ApJ in press (arXiv)

Star Formation in Intermediate Redshift 0.2 < z < 0.7 Brightest Cluster Galaxies
K. C. Cooke, C. P. O'Dea, S. A. Baum, G. R. Tremblay, I. G. Cox, & M. D. Gladders
Cooke et al. 2016, ApJ in press (arXiv)

The Close AGN Reference Survey (CARS): Mrk 1018 Returns to the Shadows after 30 years as a Seyfert 1
R. E. McElroy, B. Husemann, T. A. Davis, V. N. Bennert, G. Busch, F. Combes, A. Eckart, M. Perez-Torres, M. Powell, J. Scharwächter, G. R. Tremblay, & T. Urrutia
McElroy et al. 2016, A&A, 593, L8 (arXiv)

The Close AGN Reference Survey (CARS): What is causing Mrk 1018's Return to the Shadows after 30 years?
B. Husemann, T. Urrutia, G. R. Tremblay, M. Krumpe, J. Dexter, G. Busch, F. Combes, S. M. Croom, T. A. Davis, A. Eckhart, R. E. McElroy, M. Perez-Torres, M. Powell, & J Scharwächter
Husemann et al. 2016, A&A, 593, L9 (arXiv) 

Swift Observations of Unidentified Radio Sources in the Revised Third Cambridge Catalogue
A. Maselli, F. Massaro, G. Cusumano, V. La Parola, D. E. Harris, A. Paggi, E. Liuzzo, G. R. Tremblay, S. A. Baum, & C. P. O'Dea
Maselli et al. 2016, MNRAS, 460, 3829 (MNRAS

Powerful Activity in the Bright Ages. I. A Visible/IR Survey of High Redshift 3C Radio Galaxies and Quasars
B. Hilbert, M. Chiaberge, J. P. Kotyla, G. R. Tremblay, C. Stanghellini, W. B. Sparks, S. A. Baum, A. Capetti, F. D. Macchetto, G. K. Miley, C. P. O'Dea, E. S. Perlman, & A. C. Quillen
Hilbert et al. 2016, ApJS, 225, 12 (arXiv)

The Environment of z >1 3CR Radio Galaxies and QSOs: From Proto-Clusters to Clusters of Galaxies?
J. P. Kotyla, M. Chiaberge, S. A. Baum, A. Capetti, B. Hilbert, F. D. Macchetto, G. K. Miley, C. P. O'Dea, E. S. Perlman, W. B. Sparks, & G. R. Tremblay
Kotyla et al. 2016, ApJ, 826, 46 (arXiv)

ALMA observations of cold molecular gas filaments trailing rising radio bubbles in PKS 0745-191
H. R. Russell, B. R. McNamara, A. C. Fabian, P. E. J. Nulsen, A. C. Edge, F. Combes, N. W. Murray, I. J. Parrish, P. Salome, J. S. Sanders, S. A. Baum, M. Donahue, R. A. Main, R. W. O'Connell, C. P. O'Dea, J. B. R. Oonk, G. R. Tremblay, A. N. Vantyghem, & G. M. Voit
Russell et al. 2016, MNRAS, 458, 3134 (arXiv)

Physics GRE Scores of Prize Postdoctoral Fellows in Astronomy
E. M. Levesque, R. Bezanson, & G. R. Tremblay
A special, unrefereed post as part of a recent AAS Presidential Statement (arXiv AstroBetter | astrobites) 

Far Ultraviolet Morphology of Star Forming Filaments in Cool Core Brightest Cluster Galaxies 
G. R. Tremblay, C. P. O'Dea, S. A. Baum, R. Mittal, M. McDonald, F. Combes, Y. Li, B. McNamara, M. Bremer, T. Clarke, M. Donahue, A. Edge, A. Fabian, S. Hamer, M. Hogan, J. B. R. Oonk, A. C. Quillen, J. S. Sanders, P. Salome, & G. M. Voit
Tremblay et al. 2015, MNRAS, 451, 3768 (arXiv | NASA Press Release | Yale Press Release | IFL Science) 

The outer filament of Centaurus A as seen by MUSE
F. Santoro, J. B. R. Oonk, R. Morganti, T. A. Oosterloo, & G. R. Tremblay
Santoro et al. 2015, A&A, 575, 4 (arXiv) 

Feedback, scatter and structure in the core of the PKS 0745-191 Galaxy Cluster
J. S. Sanders, A. C. Fabian, J. Hlavacek-Larrondo, H. R. Russell, G. B. Taylor, F. Hofmann, G. R. Tremblay, & S. A. Walker
Sanders et al. 2014, MNRAS, 444, 1497 (arXiv) 

A Thirty Kiloparsec Chain of "Beads on a String" Star Formation between two Merging Early Type Galaxies in the Core of a Strong-Lensing Galaxy Cluster
G. R. Tremblay, M. Gladders, S. A. Baum, C. P. O'Dea, M. Bayliss, K. Cooke, H. Dahle, T. Davis, M. Florian, J. Rigby, K. Sharon, & E. Soto
Tremblay et al. 2014, ApJL, 790, 26 (arXiv | astrobites NASA Press ReleaseESA Press ReleaseNBC News) 

A Ten Billion Solar Mass Outflow of Molecular Gas Launched by Radio Bubbles in the Abell 1835 Brightest Cluster Galaxy 
B. R. McNamara, H. R. Russell, P. E. J. Nulsen, A. C. Edge, N. W. Murray, R. A. Main, A. N. Vantyghem, F. Combes, A. C. Fabian, P. Salome, C. C. Kirkpatrick, S. A. Baum, J. N. Bregman, M. Donahue, E. Egami, S. Hamer, C. P. O'Dea, J. B. R. Oonk, G. R. Tremblay, & G. M. Voit
McNamara et al. 2014, ApJ, 785, 44  (arXiv | CfA Science Update) 

Massive Molecular Gas Flows in the Abell 1664 Brightest Cluster Galaxy
H. R. Russell, B. R. McNamara, A. C. Edge, P. E. J. Nulsen, R. A. Main, A. N. Vantyghem, F. Combes, A. C. Fabian, N. Murray, P. Salome, R. J. Wilman, S. A. Baum, M. Donahue, C. P. O'Dea, J. B. R. Oonk, G. R. Tremblay, & G. M. Voit
Russell et al. 2013, ApJ, 784, 78 (arXiv) 

Cold Gas Dynamics in Hydra A: Evidence for a Rotating Disk 
S. L. Hamer, A. C. Edge, A. M. Swinbank, J. B. R. Oonk, R. Mittal, B. R. McNamara, H. R. Russell, M. Bremer, F. Combes, A. C. Fabian, N. P. H. Nesvadba, C. P. O'Dea, S. A. Baum, P. Salome, G. R. Tremblay, M. Donahue, G. J. Ferland, & C. L. Sarazin 
Hamer et al. 2013, MNRAS, 437, 862 (arXiv) 

Hubble Space Telescope Observations of Dusty Filaments in Hercules A: Evidence for Entrainment 
C. P. O'Dea, S. A. Baum, G. R. Tremblay, P. Kharb, W. D. Cotton, and R. A. Perley
O'Dea et al. 2013, ApJ, 771, 38 (arXiv | NASA Press Release) 

Residual Cooling and Persistent Star Formation amid AGN Feedback in Abell 2597
G. R. Tremblay, C. P. O'Dea, S. A. Baum, T. E. Clarke, C. L. Sarazin, J. N. Bregman, F. Combes, M. Donahue, A. C. Edge, A. C. Fabian, G. J. Ferland, B. R. McNamara, R. Mittal, J. B. R. Oonk, A. C. Quillen, H. R. Russell, J. S. Sanders, P. Salome, G. M. Voit, R. J. Wilman, and M. W. Wise 
Tremblay et al. 2012a, MNRAS, 424, 1042 (arXiv) 

Multiphase Signatures of AGN Feedback in Abell 2597
G. R. Tremblay, C. P. O'Dea, S. A. Baum, T. E. Clarke, C. L. Sarazin, J. N. Bregman, F. Combes, M. Donahue, A. C. Edge, A. C. Fabian, G. J. Ferland, B. R. McNamara, R. Mittal, J. B. R. Oonk, A. C. Quillen, H. R. Russell, J. S. Sanders, P. Salome, G. M. Voit, R. J. Wilman, and M. W. Wise 
Tremblay et al. 2012b, MNRAS, 424, 1026 (arXiv) 

Fueling the Central Engine of Radio Galaxies. II. The Footprints of AGN Feedback on the ISM of 3C 236
A. Labiano, S. Garcia-Burillo, F. Combes, A. Usero, R. Soria-Ruiz, G. R. Tremblay, R. Neri, A. Fuente, R. Morganti, T. Oosterloo 
Labiano et al. 2012, A&A, 549, 58  (arXiv) 

The extended soft X-ray emission in 3CR radio galaxies with z < 0.3
B. Balmaverde, A. Capetti, P. Grandi, E. Torresi, M. Chiaberge, J. Rodriguez Zaurin, G. R. Tremblay, D. J. Axon, S. A. Baum, G. Giovannini, P. Kharb, F. D. Macchetto, C. P. O'Dea, W. B. Sparks
Balmaverde et al. 2012, A&A, 545, 14 (arXiv) 

Herschel Observations of Extended Atomic Gas in the Core of the Perseus Cluster
R. Mittal, J. B. R. Oonk. G. J. Ferland, A. C. Edge, C. P. O'Dea, S. A. Baum, J. T. Whelan, R. Johnstone, P. Salome, A. C. Fabian, G. R. Tremblay, M. Donahue, H. Russell 
Mittal et al. 2012, MNRAS, 426, 2957 (arXiv)

Herschel Observations of the Centaurus Cluster - The Dynamics of Cold Gas in a Cool Core
R. Mittal, C. P. O'Dea, G. Ferland, J. B. R. Oonk, A. C. Edge, R. E. A. Canning, H. R. Russell,  S. A. Baum, H. Boehringer, F. Combes, M. Donahue, A. C. Fabian, N. A. Hatch, A. Hoffer, R. Johnstone, B. R. McNamara, P. Salome, & G. R. Tremblay
Mittal et al. 2011, MNRAS, 418, 2386 (arXiv) 

Episodic Star Formation Coupled to Reignition of Radio Activity in 3C 236 
G. R. Tremblay, C. P. O'Dea, S. A. Baum, A. Koekemoer, W. B. Sparks, G. de Bruyn, A. Schoenmakers
Tremblay et al. 2010, ApJ, 715, 172 (arXiv) 

HST FUV Observations of Brightest Cluster Galaxies: The Role of Star Formation in Cooling Flows and BCG Evolution 
K. P. O'Dea, A. C. Quillen, C. P. O'Dea, G. R. Tremblay, B. T. Snios, S. A. Baum, K. Christiansen, J. Noel-Storr, A. C. Edge, M. Donahue, G. M. Voit
O'Dea et al. 2010, ApJ, 719, 1619 (arXiv) 

Three Candidate Clusters of Galaxies at Redshift ~1.8: The "Missing Link" Between Protoclusters and Local Clusters? 
M. Chiaberge, A. Capetti, F. D. Macchetto, P. Rosati, P. Tozzi, G. R. Tremblay
Chiaberge et al. 2010, ApJL, 710, 107 (arXiv) 

Chandra Observations of Low Redshift 3C Radio Galaxies: Nuclei, Diffuse Emission, Jets and Hotspots 
F. Massaro, D. E. Harris, G. R. Tremblay, D. Axon, S. A. Baum, A. Capetti, M. Chiaberge, R. Gilli, G. Giovannini, P. Grandi, F. D. Macchetto, C. P. O'Dea, G. Risalti, W. B. Sparks
Massaro et al. 2010, ApJ, 714, 589 (arXiv) 

HST/ACS Emission Line Snapshots of nearby 3CR Radio Galaxies I: The Data
G. R. Tremblay, M. Chiaberge, W. B. Sparks, S. A. Baum, M. G. Allen, D. J. Axon, A. Capetti, D. J. E. Floyd, F. D. Macchetto, G. K. Miley, J. Noel-Storr, C. P. O'Dea, E. S. Perlman, A. C. Quillen
Tremblay et al. 2009, ApJS, 183, 278 (arXiv) 

Low-Power Radio Galaxies in the Distant Universe: A Search for FR I at 1 < z < 2 in the COSMOS Field 
M. Chiaberge, G. R. Tremblay, A. Capetti, F. D. Macchetto, P. Tozzi, & W. B. Sparks
Chiaberge et al. 2009, ApJ, 696, 1003, (arXiv) 

Isophotal Structure and Dust Distribution in Radio-Loud Elliptical Galaxies
G. R. Tremblay, M. Chiaberge, C. J. Donzelli, A. C. Quillen, A. Capetti, W. B. Sparks, & F. D. Macchetto 
Tremblay et al. 2007, ApJ, 666, 109 (arXiv

The Warped Nuclear Disk of Radio Galaxy 3C 449
G. R. Tremblay, A. C. Quillen, D. J. E. Floyd, J. Noel-Storr, S. A. Baum, D. Axon, C. P. O'Dea, M. Chiaberge, F. D. Macchetto, W. B. Sparks, G. K. Miley, A. Capetti, J. P. Madrid, & E. Perlman 
Tremblay et al. 2006, ApJ, 643, 101 (arXiv

apollo_earth.jpg

Python Code

 
 

 


Rainmaker, a galaxy cluster entropy profile mapper. Coming in 2017.
Aoide, a MUSE integral field spectroscopy analysis suite. Coming in 2018.
HRCsentinel, a multi-faceted monitor for Chandra's High Resolution Camera. Coming in 2018.

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Stuff on Earth

Videos of recent dives: 

My very amateur (astro)photography: