Puragra Guhathakurta | University of California, Santa Cruz (original) (raw)
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Papers by Puragra Guhathakurta
Astronomical Journal, 1998
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Astronomical Journal, 1998
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Monthly Notices of the Royal Astronomical Society, 2012
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The Astrophysical Journal, 2006
Page 1. THE DEEP2 GALAXY REDSHIFT SURVEY: CLUSTERING OF GALAXIES AS A FUNCTION OF LUMINOSITY AT z... more Page 1. THE DEEP2 GALAXY REDSHIFT SURVEY: CLUSTERING OF GALAXIES AS A FUNCTION OF LUMINOSITY AT z = 1 Alison L. Coil, 1,2 Jeffrey A. Newman, 1,3 Michael C. Cooper, 4 Marc Davis, 4 SM Faber, 5 David ...
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The Astrophysical Journal, 2013
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The Astrophysical Journal, 2012
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We marginalize over solutions to the spherical Jeans equation to obtain mass profiles for five An... more We marginalize over solutions to the spherical Jeans equation to obtain mass profiles for five Andromeda dwarf spheroidals (dSphs). We analyze stellar kinematics of And I, II, III, X, and XIV, obtained from Keck/DEIMOS spectroscopy, and we compare the mass within 300 parsecs to the Milky Way dSphs.
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We present Keck DEIMOS spectra of stars associated with three newly discovered tidal streams in t... more We present Keck DEIMOS spectra of stars associated with three newly discovered tidal streams in the remote outer halo of the Andromeda spiral galaxy (M31). Two of these streams, Streams E and F (at Rproj 60 and 100 kpc, respectively, on the NW minor axis), were discovered by members of our collaboration in a deep, wide-field Subaru SuprimeCam imaging survey.
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The concordance Lambda Cold Dark Matter (Lambda-CDM) model for the formation of structure in the ... more The concordance Lambda Cold Dark Matter (Lambda-CDM) model for the formation of structure in the Universe, while remarkably successful at describing observations of structure on large scales, continues to be challenged by observations on galactic scales. Fortunately, CDM models and their various proposed alternatives make a rich variety of testable predictions that make the Local Group and our own Milky
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Understanding the formation of galaxies and their structural subcomponents is a key goal of moder... more Understanding the formation of galaxies and their structural subcomponents is a key goal of modern cosmology. Large spiral galaxies like our own consist of a flattened rotating disk, a centrally concentrated bulge whose density decreases exponentially with increasing radius, and an extended halo whose density scales as an inverse power law in radius. Our internal vantage point is disadvantageous for
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Astrophysical Journal, 2004
We derive the close, kinematic pair fraction and merger rate up to redshift z~1.2 from the initia... more We derive the close, kinematic pair fraction and merger rate up to redshift z~1.2 from the initial data of the DEEP2 Redshift Survey. Assuming a mild luminosity evolution, the number of companions per luminous galaxy is found to evolve as (1+z)m, with m=0.51+/-0.28 assuming no evolution, m=1.60+/-0.29. Our results imply that only 9% of present-day L* galaxies have undergone major
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The Astrophysical Journal, 2011
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Proceedings of SPIE - The International Society for Optical Engineering, 2002
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The Astrophysical Journal, 2007
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The Astrophysical Journal, 1989
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The Astrophysical Journal, 2008
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The Astrophysical Journal, 2004
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The Astrophysical Journal, 2012
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The Astrophysical Journal, 2007
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Astronomical Journal, 1998
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Astronomical Journal, 1998
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Monthly Notices of the Royal Astronomical Society, 2012
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The Astrophysical Journal, 2006
Page 1. THE DEEP2 GALAXY REDSHIFT SURVEY: CLUSTERING OF GALAXIES AS A FUNCTION OF LUMINOSITY AT z... more Page 1. THE DEEP2 GALAXY REDSHIFT SURVEY: CLUSTERING OF GALAXIES AS A FUNCTION OF LUMINOSITY AT z = 1 Alison L. Coil, 1,2 Jeffrey A. Newman, 1,3 Michael C. Cooper, 4 Marc Davis, 4 SM Faber, 5 David ...
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The Astrophysical Journal, 2013
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The Astrophysical Journal, 2012
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We marginalize over solutions to the spherical Jeans equation to obtain mass profiles for five An... more We marginalize over solutions to the spherical Jeans equation to obtain mass profiles for five Andromeda dwarf spheroidals (dSphs). We analyze stellar kinematics of And I, II, III, X, and XIV, obtained from Keck/DEIMOS spectroscopy, and we compare the mass within 300 parsecs to the Milky Way dSphs.
Bookmarks Related papers MentionsView impact
We present Keck DEIMOS spectra of stars associated with three newly discovered tidal streams in t... more We present Keck DEIMOS spectra of stars associated with three newly discovered tidal streams in the remote outer halo of the Andromeda spiral galaxy (M31). Two of these streams, Streams E and F (at Rproj 60 and 100 kpc, respectively, on the NW minor axis), were discovered by members of our collaboration in a deep, wide-field Subaru SuprimeCam imaging survey.
Bookmarks Related papers MentionsView impact
The concordance Lambda Cold Dark Matter (Lambda-CDM) model for the formation of structure in the ... more The concordance Lambda Cold Dark Matter (Lambda-CDM) model for the formation of structure in the Universe, while remarkably successful at describing observations of structure on large scales, continues to be challenged by observations on galactic scales. Fortunately, CDM models and their various proposed alternatives make a rich variety of testable predictions that make the Local Group and our own Milky
Bookmarks Related papers MentionsView impact
Understanding the formation of galaxies and their structural subcomponents is a key goal of moder... more Understanding the formation of galaxies and their structural subcomponents is a key goal of modern cosmology. Large spiral galaxies like our own consist of a flattened rotating disk, a centrally concentrated bulge whose density decreases exponentially with increasing radius, and an extended halo whose density scales as an inverse power law in radius. Our internal vantage point is disadvantageous for
Bookmarks Related papers MentionsView impact
Astrophysical Journal, 2004
We derive the close, kinematic pair fraction and merger rate up to redshift z~1.2 from the initia... more We derive the close, kinematic pair fraction and merger rate up to redshift z~1.2 from the initial data of the DEEP2 Redshift Survey. Assuming a mild luminosity evolution, the number of companions per luminous galaxy is found to evolve as (1+z)m, with m=0.51+/-0.28 assuming no evolution, m=1.60+/-0.29. Our results imply that only 9% of present-day L* galaxies have undergone major
Bookmarks Related papers MentionsView impact
The Astrophysical Journal, 2011
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Proceedings of SPIE - The International Society for Optical Engineering, 2002
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The Astrophysical Journal, 2007
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The Astrophysical Journal, 1989
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The Astrophysical Journal, 2008
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The Astrophysical Journal, 2004
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The Astrophysical Journal, 2012
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The Astrophysical Journal, 2007
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