Jeyhan Sevim Kartaltepe is an American astronomer, Associate Professor and Director of the
Rochester Institute of Technology
Rochester Institute of Technology (RIT) is a private research university in the town of Henrietta in the Rochester, New York, metropolitan area. The university offers undergraduate and graduate degrees, including doctoral and professional ...
Laboratory for Multiwavelength Astrophysics. Her research considers observational astronomy and galaxy evolution. She is a lead investigator on the
Cosmic Evolution Early Release Science Survey and the COSMOS-Webb Survey conducted on the
James Webb Space Telescope.
Early life and education
Kartaltepe is from
San Antonio
("Cradle of Freedom")
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. She studied physics at
Colgate University, where she majored in astronomy and spent her free time using the 16-inch telescope on campus. She moved to the
University of Hawaii at Mānoa
A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. Universities typically offer both undergraduate and postgraduate programs. In the United States, the ...
for her graduate studies. She completed a master's degree in 2005, and embarked on a doctorate researching galaxies in the cosmos field. After earning her doctorate Kartaltepe was appointed a postdoctoral researcher at
National Optical Astronomy Observatory, where she worked for two years before being made a
Hubble Fellow. At the
NOAO
The National Optical Astronomy Observatory (NOAO) was the United States national observatory for ground-based nighttime ultraviolet-optical-infrared (OUVIR) astronomy. The National Science Foundation (NSF) funded NOAO to provide forefront astronom ...
Kartaltepe investigated the interconnecting roles galaxy mergers and
active galactic nuclei
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much-higher-than-normal luminosity over at least some portion of the electromagnetic spectrum with characteristics indicating that the luminosity is not prod ...
play amongst ultraluminous infrared galaxies.
Research and career
In 2015 Kartaltepe joined the
Rochester Institute of Technology
Rochester Institute of Technology (RIT) is a private research university in the town of Henrietta in the Rochester, New York, metropolitan area. The university offers undergraduate and graduate degrees, including doctoral and professional ...
, where she is Director of the Laboratory for Multiwavelength Astrophysics. She was a founder of the
Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is the largest project in the history of the Hubble Space Telescope, with 902 assigned orbits (about 60 continuous days) of observing time. It was carried out between 201 ...
(CANDELS) collaboration.
She is part of leadership of the
Cosmic Evolution Early Release Science Survey. CEERS is one of the first collaborations to conduct observations using the
James Webb Space Telescope, and looks to better understand the abundance of galaxies with
photometric redshift A photometric redshift is an estimate for the recession velocity of an astronomical object such as a galaxy or quasar, made without measuring its spectrum. The technique uses photometry (that is, the brightness of the object viewed through various ...
s between 3 and 9, as they were 11 – 13 billion years ago. Her other JWST project, COSMOS-Webb, surveyed a large patch of sky with a
Near Infrared Camera
NIRCam (Near-InfraRed Camera) is an instrument aboard the James Webb Space Telescope. It has two major tasks, as an imager from 0.6 to 5 micron wavelength, and as a wavefront sensor to keep the 18-section mirrors functioning as one. In other wor ...
. It combined these data with mid-infrared images captured simultaneously.
COSMOS-Webb looks to probe the first moments in which massive galaxies formed, and, using weak lensing, looked to map the dark matter distribution at early stages.
It will help to identify the first fully evolved galaxies, which had stopped being active in the first two billion years afte the
Big Bang.
COSMOS-Webb received the largest number of observation hours on JWST. Kartaltepe's first observations from COSMOS-Webb identified considerably more early galaxies than expected, indicating that the universe expanded faster than expected.
Alongside her research, Kartaltepe is committed to science communication and outreach. She delivered a talk on the design of the
James Webb Space Telescope at the 2022
Falling Walls
The Falling Walls Conference is an annual science event in Berlin, Germany, that coincides with the anniversary of the Fall of the Berlin Wall (9 November 1989). The one-day scientific conference showcases the research work of international scient ...
.
Select publications
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References
Living people
People from San Antonio
Scientists from Texas
Colgate University alumni
University of Hawai{{okinai at Mānoa alumni
Rochester Institute of Technology faculty
American women astronomers
20th-century American women scientists
21st-century American women scientists
20th-century American astronomers
21st-century American astronomers
Year of birth missing (living people)