Geha, M., Van Der Marel, R. P., Guhathakurta, P., Gilbert, K. M., Kalirai, J., Kirby, E. N.
We present kinematic and metallicity profiles for the M31 dwarf elliptical (dE) satellite galaxies NGC 147 and NGC 185. The profiles represent the most extensive spectroscopic radial coverage for any...
Structure and Population of the Andromeda Stellar Halo from a Subaru/Suprime-Cam Survey (2009)
Tanaka, M., Chiba, M., Komiyama, Y., Guhathakurta, P., Kalirai, J. S., Iye, M.
We present a photometric survey of the stellar halo of the Andromeda galaxy, using Suprime-Cam on the Subaru Telescope. A detailed analysis of VI color-magnitude diagrams of the resolved stellar...
Mixed Populations in Globular Clusters: Et Tu, 47 Tuc? (2009)
Anderson, J., Piotto, G., King, I. R., Bedin, L. R., Guhathakurta, P.
We exploit the large number of archival HST images of 47 Tuc to examine its subgiant branch (SGB) and main sequence (MS) for signs of multiple populations. In the cluster core, we find that the...
AEGIS-X: The Chandra Deep Survey of the Extended Groth Strip (2008)
Laird, E. S., Nandra, K., Georgakakis, A., Aird, J. A., Barmby, P., Conselice, C. J., ...
We present the AEGIS-X survey, a series of deep Chandra ACIS-I observations of the Extended Groth Strip. The survey comprises pointings at 8 separate positions, each with nominal exposure 200ks,...
Darwin Tames an Andromeda Dwarf: Unraveling the Orbit of NGC 205 Using a Genetic Algorithm (2008)
Howley, K. M., Geha, M., Guhathakurta, P., Montgomery, R. M., Laughlin, G., Johnston, K. V.
NGC 205, a close satellite of the M31 galaxy, is our nearest example of a dwarf elliptical galaxy. Photometric and kinematic observations suggest that NGC 205 is undergoing tidal distortion from its...
Noeske, K. G., Weiner, B. J., Faber, S. M., Papovich, C., Koo, D. C., Somerville, R. S., ...
We analyze star formation (SF) as a function of stellar mass (M☉) and redshift z in the All-Wavelength Extended Groth Strip International Survey. For 2905 field galaxies, complete to 10^10(10^10.8...
The All-Wavelength Extended Groth Strip International Survey (AEGIS) Data Sets (2007)
Davis, M., Guhathakurta, P., Konidaris, N. P., Newman, J. A., Ashby, M. L. N., Biggs, A. D., ...
In this the first of a series of Letters, we present a panchromatic data set in the Extended Groth Strip region of the sky. Our survey, the All-Wavelength Extended Groth Strip International Survey...
Frye, B. L., Coe, D., Bowen, D. V., Benitez, N., Broadhurst, T., Guhathakurta, P., ...
We present results of the HST Advanced Camera for Surveys spectroscopic ground-based redshift survey in the field of A1689. We measure 98 redshifts, increasing the number of spectroscopically...
Noeske, K. G., Weiner, B. J., Faber, S. M., Papovich, C., Koo, D. C., Somerville, R. S., ...
We analyze star formation (SF) as a function of stellar mass (M*) and redshift z in the All Wavelength Extended Groth Strip International Survey (AEGIS). For 2905 field galaxies, complete to...
The DEEP2 Galaxy Redshift Survey: Redshift Identification of Single-Line Emission Galaxies (2007)
Kirby, E. N., Guhathakurta, P., Faber, S. M., Koo, D. C., Weiner, B. J., Cooper, M. C.
We present two methods for determining spectroscopic redshifts of galaxies in the DEEP2 survey which display only one identifiable feature, an emission line, in the observed spectrum ("single-line...
Noeske, K. G., Weiner, B. J., Faber, S. M., Papovich, C., Koo, D. C., Somerville, R. S., ...
We analyze star formation (SF) as a function of stellar mass (M*) and redshift z in the All-Wavelength Extended Groth Strip International Survey. For 2905 field galaxies, complete to 1010(1010.8)...
Faber, S. M., Willmer, C. N. A., Wolf, C., Koo, D. C., Weiner, B. J., Newman, J. A., ...
The DEEP2 and COMBO-17 surveys are compared to study luminosity functions of red and blue galaxies to z~1. The two surveys have different methods and sensitivities, but nevertheless results agree....
The All-Wavelength Extended Groth Strip International Survey (AEGIS) Data Sets (2006)
Davis, M., Guhathakurta, P., Konidaris, N.P., Newman, J.A., Ashby, M.L.N., Biggs, A.D., ...
On the incidence of strong MgII absorbers along gamma-ray burst sight lines (2006)
Prochter, Gabriel E., Prochaska, Jason X., Chen, Hsiao-Wen, Bloom, Joshua S., Dessauges-Zavadsky, Miroslava, Foley, Ryan J., ...
We report on a survey for strong ( rest equivalent width W-r >= 1 angstrom) intervening Mg II systems along the sight lines to long-duration gamma-ray bursts (GRBs). The GRB spectra that comprise the...
Investigating the Andromeda Stream: III. A Young Shell System in M31 (2006)
Fardal, M. A., Guhathakurta, P., Babul, A., McConnachie, A. W.
Published maps of red giant stars in the halo region of M31 exhibit a giant stellar stream to the south of this galaxy, as well as a giant "shelf" to the northeast of M31's center. Using these maps,...
AEGIS: Galaxy Spectral Energy Distributions from the X-Ray to Radio (2006)
Konidaris, N. P., Guhathakurta, P., Bundy, K., Coil, A. L., Conselice, C. J., Cooper, M. C., ...
The All-wavelength Extended Groth Strip International Survey (AEGIS) team presents broad-band spectral energy distributions (SEDs), from X-ray to radio wavelengths, for 71 galaxies spanning the...
Sohn, Sangmo Tony, Majewski, S. R., Muñoz, R. R., Kunkel, W. E., Johnston, K. V., Ostheimer, J. C., ...
We present a wide-field (4.5 deg^2) photometric and spectroscopic survey of the Leo I dwarf spheroidal (dSph) galaxy to explore its extended morphology and dynamics. As in previous papers in this...
The All-wavelength Extended Groth Strip International Survey (AEGIS) Data Sets (2006)
Davis, M., Guhathakurta, P., Konidaris, N., Newman, J. A., Ashby, M. L. N., Biggs, A. D., ...
In this the first of a series of Letters, we present a description of the panchromatic data sets that have been acquired in the Extended Groth Strip region of the sky. Our survey, the All-wavelength...
A Strong-Lens Survey in AEGIS: the influence of large scale structure (2006)
Moustakas, L. A., Marshall, P. J., Newman, J. A., Coil, A. L., Cooper, M. C., Davis, M., ...
We report on the results of a visual search for galaxy-scale strong gravitational lenses over 650 arcmin^2 of HST/ACS imaging in the DEEP2-EGS field. In addition to a previously-known Einstein Cross...
The Metal-Poor Halo of the Andromeda Spiral Galaxy (M31) (2006)
Kalirai, J. S., Gilbert, K. M., Guhathakurta, P., Majewski, S. R., Ostheimer, J. C., Rich, R. M., ...
We present spectroscopic observations of red giant branch (RGB) stars over a large expanse in the halo of the Andromeda spiral galaxy (M31), acquired with the DEIMOS instrument on the Keck II 10-m...
On the Incidence of Strong MgII Absorbers Along GRB Sightlines (2006)
Prochter, G. E., Prochaska, J. X., Bloom, J. S., Dessauges-Zavadsky, M., Foley, R. J., ...
We report on a survey for strong (rest equivalent width W_r >= 1A), intervening MgII systems along the sightlines to long-duration gamma-ray bursts (GRBs). The GRB spectra which comprise the survey...
The Evolution of Galaxy Mergers and Morphology at z (2006)
Lotz, J. M., Davis, M., Faber, S. M., Guhathakurta, P., Gwyn, S., Huang, J., ...
We present the quantitative rest-frame B morphological evolution and galaxy merger fractions at 0.2 < z < 1.2 as observed by the All-wavelength Extended Groth Strip International Survey (AEGIS). We...
Kalirai, J. S., Guhathakurta, P., Gilbert, K. M., Reitzel, D. B., Majewski, S. R., Rich, R. M., ...
We present spectroscopic observations of red giant branch (RGB) stars in the Andromeda spiral galaxy (M31), acquired with the DEIMOS instrument on the Keck II 10-m telescope. The three fields...
Geha, M., Guhathakurta, P., Rich, R. M., Cooper, M. C.
NGC 205 is the nearest example of a dwarf elliptical (dE) galaxy and the prototype of this enigmatic galaxy class. Photometric evidence suggests that NGC 205, a close satellite of the M31 galaxy, is...
Measuring the Growth of Structure with Spectroscopically Identified Groups and Clusters (2005)
Davis, M., Gerke, B. F., Coil, A. L., Cooper, M. C., Yan, R., Newman, J. A., ...
Number counts of galaxy clusters offer a very promising probe of the Dark Energy (DE) equation-of-state parameter, $w$. The basic goal is to measure abundances of these objects as a function of...
The DEEP2 Galaxy Redshift Survey: The Galaxy Luminosity Function to z ~ 1 (2005)
Willmer, C. N. A., Faber, S. M., Koo, D. C., Weiner, B. J., Newman, J. A., Coil, A. L., ...
The evolution of the B-band galaxy luminosity function is measured using a sample of more than 11,000 galaxies with spectroscopic redshifts from the DEEP2 Redshift Survey. The rest-frame M_B versus...
Faber, S. M., Willmer, C. N. A., Wolf, C., Koo, D. C., Weiner, B. J., Newman, J. A., ...
The DEEP2 and COMBO-17 surveys are used to study the evolution of the luminosity function of red and blue galaxies to $z \sim 1$. Schechter function fits show that, since $z = 1$, $M^*_B$ dims by...
NGC 770: A Counter-Rotating Core in a Low-Luminosity Elliptical Galaxy (2005)
We present evidence for a counter-rotating core in the low-luminosity (M_B = -18.2) elliptical galaxy NGC 770 based on internal stellar kinematic data. This counter-rotating core is unusual as NGC...
Investigating the Andromeda Stream: I. Simple Analytic Bulge-Disk-Halo Model for M31 (2005)
Geehan, J. J., Fardal, M. A., Babul, A., Guhathakurta, P.
This paper is the first in a series which studies interactions between M31 and its satellites, including the origin of the giant southern stream. We construct accurate yet simple analytic models for...
Investigating the Andromeda Stream: II. Orbital Fits and Properties of the Progenitor (2005)
Fardal, M. A., Babul, A., Geehan, J. J., Guhathakurta, P.
We construct test-particle orbits and simple N-body models that match the properties of the giant stellar stream observed to the south of M31, using the model of M31's potential derived in the...
Melbourne, J., Guhathakurta, P.
We present 3 methods for measuring the Galactic dust extinction law slope R_V and a method for quantifying fine structure in dust clouds in the direction of differentially-reddened globular clusters....
Supernovae in Galaxy Clusters (2003)
Gal-Yam, A., Maoz, D., Sharon, K., Prada, F., Guhathakurta, P., Filippenko, A. V.
We present the results of several surveys for supernovae (SNe) in galaxy clusters. SNe discovered in deep, archival HST images were used to measure the cluster SN Ia rate to z=1. A search for SNe in...
An HI survey of clusters in the local universe (2003)
Van Gorkom, J.H., Bravo-Alfaro, H, Dwarakanath, K.S., Guhathakurta, P., Poggianti, B.M., Schiminovich, D., ...
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We present spatially-resolved internal kinematics and stellar chemical abundances for a sample of dwarf elliptical (dE) galaxies in the Virgo Cluster observed with Keck/ESI. We find that 4 out of 17...
Tidal dwarfs in the M81 group: the second generation? (2003)
Makarova, L., Grebel, E., Karachentsev, I., Dolphin, A., Karachentseva, V., Sharina, M., ...
We present a quantitative star formation history derivationof the foursuspected tidal dwarf galaxies in the M 81 group: Holmberg IX, BK3N,Arp-loop (A0952+69) and Garland using HST/WFPC2 images of...
Distances to Nearby Galaxies in Sculptor (2003)
Karachentsev, I. D., Grebel, E. K., Sharina, M. E., Dolphin, A. E., Geisler, D., Guhathakurta, P., ...
We present an analysis of Hubble Space Telescope/WFPC2 images of nine nearby galaxies in Sculptor. We derive their distances from the luminosity of the tip of the red giant branch stars with a...
Distances to nearby galaxies in sculptor (2003)
Karachentsev, I.D., Grebel, E.K., Sharina, M.E., Dolphin, A.E., Geisler, D., Guhathakurta, P., ...
We present an analysis of Hubble Space Telescope/WFPC2 images of nine nearby galaxies in Sculptor. We derive their distances from the luminosity of the tip of the red giant branch stars with a...
Local galaxy flows within 5 Mpc (2003)
Karachentsev, I.D., Makarov, D.I., Sharina, M.E., Dolphin, A.E., Grebel, E.K., Geisler, D., ...
Galaxy flow in the Canes Venatici I cloud (2003)
Karachentsev, I. D., Sharina, M. E., Dolphin, A. E., Grebel, E. K., Geisler, D., Guhathakurta, P., ...
We present an analysis of Hubble Space Telescope/WFPC2 images of eighteen galaxies in the Canes Venatici I cloud. We derive their distances from the luminosity of the tip of the red giant branch...
Tidal dwarfs in the M81 group: The second generation? (2003)
Makarova, L., Grebel, E.K., Karachentsev, I.D., Dolphin, A.E., Karachentseva, V.E., Sharina, M.E., ...
Local galaxy flows within 5 Mpc (2002)
Karachentsev, I. D., Makarov, D. I., Sharina, M. E., Dolphin, A. E., Grebel, E. K., Geisler, D., ...
We present Hubble Space Telescope/WFPC2 images of sixteen dwarf galaxies as part of our snapshot survey of nearby galaxy candidates. We derive their distances from the luminosity of the tip of the...
Galaxy Flow in the Canes Venatici I Cloud (2002)
Karachentsev, I. D., Sharina, M. E., Dolphin, A. E., Grebel, E. K., Geisler, D., Guhathakurta, P., ...
We present an analysis of Hubble Space Telescope/WFPC2 images of eighteen galaxies in the Canes Venatici I cloud. We derive their distances from the luminosity of the tip of the red giant branch...
Tidal dwarfs in the M81 group: the second generation? (2002)
Makarova, L. N., Grebel, E. K., Karachentsev, I. D., Dolphin, A. E., Karachentseva, V. E., Sharina, M. E., ...
We derive quantitative star formation histories of the four suspected tidal dwarf galaxies in the M81 group, HolmbergIX, BK3N, Arp-loop (A0952+69), and Garland, using Hubble Space Telescope/Wide...
Wittman, D., Tyson, J. A., Dell'Antonio, I. P., Becker, A. C., Margoniner, V. E., Cohen, J., ...
The Deep Lens Survey (DLS) is a deep BVRz' imaging survey of seven 2x2 degree fields, with all data to be made public. The primary scientific driver is weak gravitational lensing, but the survey is...
Science Objectives and Early Results of the DEEP2 Redshift Survey (2002)
Davis, Marc, Faber, Sandra M., Newman, Jeffrey A., Phillips, Andrew C., Ellis, R. S., Steidel, C. C., ...
The DEIMOS spectrograph has now been installed on the Keck-II telescope and commissioning is nearly complete. The DEEP2 Redshift Survey, which will take approximately 120 nights at the Keck...
Keck/ESI spectroscopy is presented for six Virgo Cluster dwarf elliptical (dE) galaxies. The mean line-of-sight velocity and velocity dispersion are resolved as a function of radius along the major...
The very local Hubble flow (2002)
Karachentsev, I. D., Sharina, M. E., Makarov, D. I., Dolphin, A. E., Grebel, E. K., Geisler, D., ...
We present Hubble Space Telescope/WFPC2 images of eighteen galaxies situated in the vicinity of the Local Group (LG) as part of an ongoing snapshot survey of nearby galaxies. Their distances derived...
Keck Spectroscopy of Red Giants in the M31 dSph Satellites: Chemical Abundance Spread (2002)
Datta, S., Pittroff, L., Guhathakurta, P., Grebel, E., Harbeck, D.
The Stellar Populations of the Cetus Dwarf Spheroidal Galaxy (2002)
Sarajedini, A., Grebel, E. K., Dolphin, A. E., Seitzer, P., Geisler, D., Guhathakurta, P., ...
The M 81 group of galaxies: New distances, kinematics and structure (2002)
Karachentsev, I. D., Dolphin, A. E., Geisler, D., Grebel, E. K., Guhathakurta, P., Hodge, P. W., ...
New distances to galaxies in the Centaurus A group (2002)
Karachentsev, I. D., Sharina, M. E., Dolphin, A. E., Grebel, E. K., Geisler, D., Guhathakurta, P., ...
The very local Hubble flow (2002)
Karachentsev, I. D., Sharina, M. E., Makarov, D. I., Dolphin, A. E., Grebel, E. K., Geisler, D., ...
The Stellar Populations of the Cetus Dwarf Spheroidal Galaxy (2001)
Sarajedini, A., Grebel, E. K., Dolphin, A. E., Seitzer, P., Geisler, D., Guhathakurta, P., ...
We present Hubble Space Telescope Wide Field Planetary Camera 2 photometry in the V and I passbands of the recently discovered Local Group dwarf spheroidal galaxy in Cetus. Our color-magnitude...
A new galaxy near the Local Group in Draco (2001)
Karachentsev, I. D., Sharina, M. E., Dolphin, A. E., Geisler, D., Grebel, E. K., Guhathakurta, P., ...
We present HST WFPC2 and ground-based images of the low surface brightness dwarf Irr/Sph galaxy KKR~25 in Draco. Its colour-magnitude diagram shows red giant branch stars with the tip at I = 22.32...
Population Gradients in Local Group Dwarf Spheroidals (2001)
Harbeck, D., Grebel, E. K., Holtzman, J., Guhathakurta, P., Brandner, W., Geisler, D., ...
We present a systematic and homogeneous analysis of population gradients for the Local Group dwarf spheroidals (dSphs) Carina, Sculptor, Sextans, Tucana, Andromeda I-III, V, and VI. For all of the...
Keck Spectroscopy of Dwarf Elliptical Galaxies in the Virgo Cluster (2001)
Keck spectroscopy is presented for four dwarf elliptical galaxies in the Virgo Cluster. At this distance, the mean velocity and velocity dispersion are well resolved as a function of radius between...
SX Phoenicis Stars in the Core of 47 Tucanae (2001)
Bruntt, H., Frandsen, S., Gilliland, R. L., Christensen-Dalsgaard, J., Petersen, J. O., Guhathakurta, P., ...
We present new results on five of six known SX Phoenicis stars in the core of the globular cluster 47 Tucanae. We give interpretations of the light curves in the V and I bands from 8.3 days of...
The Stellar Content and Distance of UGC 4483 (2000)
Dolphin, A. E., Makarova, L., Karachentsev, I. D., Karachentseva, V. E., Geisler, D., Grebel, E. K., ...
We present HST/WFPC2 observations of UGC 4483, an irregular galaxy in the M81/NGC 2403 complex. Stellar photometry was carried out with HSTphot, and is complete to V ~ 26.0 and I ~ 24.7. We measure...
Dwarf Spheroidal Galaxies in the M81 Group Imaged with WFPC2 (2000)
Karachentsev, I. D., Karachentseva, V. E., Dolphin, A. E., Geisler, D., Grebel, E. K., Guhathakurta, P., ...
We obtained HST/WFPC2 images of the dwarf spheroidal (dSph) galaxies K61, K63, K64, DDO78, BK6N, and kk77 in the M81 group. Our color-magnitude diagrams show red giant branches with tips (TRGB)...
A Lack of Planets in 47 Tucanae from an HST Search (2000)
Gilliland, Ronald L., Brown, T. M., Guhathakurta, P., Sarajedini, A., Milone, E. F., Albrow, M. D., ...
We report results from a large Hubble Space Telescope project to observe a significant (~34,000) ensemble of main sequence stars in the globular cluster 47 Tucanae with a goal of defining the...
Dynamical Mass Estimates for the Halo of M31 from Keck Spectroscopy (2000)
Evans, N. W., Wilkinson, M. I., Guhathakurta, P., Grebel, E. K., Vogt, S. S.
The last few months have seen the measurements of the radial velocities of all of the dwarf spheroidal companions to the Andromeda galaxy (M31) using the spectrographs (HIRES and LRIS) on the Keck...
A Dwarf Galaxy Survey in the Local Volume (2000)
Grebel, E. K., Seitzer, P., Dolphin, A. E., Geisler, D., Guhathakurta, P., Hodge, P. W., ...
We are carrying out a comprehensive multi-wavelength study of dwarf galaxies in the Local Volume (< 5 Mpc). After our all-sky survey more than doubled the dwarf census we are now measuring structural...
The dwarf spheroidal galaxy DDO 44: stellar populations and distance (1999)
Karachentsev, I. D., Sharina, M. E., Grebel, E. K., Dolphin, A. E., Geisler, D., Guhathakurta, P., ...
We present ground-based and HST WFPC2 imaging of the nearby low surface brightness dwarf spheroidal galaxy DDO 44. For the first time DDO 44 was resolved into stars. The resulting color-magnitude...
Optical Light Curves of the Type Ia Supernovae 1990N and 1991T (1997)
Lira, P., Suntzeff, Nicholas B., Phillips, M. M., Hamuy, Mario, Maza, Jose, Schommer, R. A., ...
We present UBVRI light curves for the bright Type Ia supernovae SN 1990N in NGC 4639 and SN 1991T in NGC 4527 based on photometry gathered in the course of the Calan/Tololo supernova program. Both...
Guhathakurta, P., Colless, M., Ing, K.
We present measurements of the OII(3727) emission line width for a complete sample of 24 blue field galaxies (21.25
The Properties of an HI-Selected Galaxy Sample (1994)
Szomoru, A., Guhathakurta, P., Van Gorkom, J., Knapen, J., Weinberg, D., Fruchter, A.
We analyze the properties of a sample of galaxies identified in a 21-cm, HI-line survey of selected areas in the Perseus-Pisces supercluster and its foreground void. Twelve fields were observed in...