Sangeeta's Research

GRism ACS Program for Extragalactic Science (GRAPES)

  1. Ryan, R. E., Jr., Hathi, N. P., Cohen, S. H., Malhotra, S., Rhoads, J., Windhorst, R. A., Budavári, T., Pirzkal, N., Xu, C., Panagia, N., Moustakas, L., di Serego Alighieri, S., & Yan, H. 2007, ArXiv Astrophysics e-prints The Galaxy Luminosity Function at z~1 in the HUDF: Probing the Dwarf Population
  2. Xu, Chun, Pirzkal, Norbert, Malhotra, Sangeeta, Rhoads, James E., Mobasher, Bahram, Daddi, Emanuele, Gronwall, Caryl, Hathi, Nimish P., Panagia, Nino, Ferguson, Henry C., Koekemoer, Anton M., Kuemmel, Martin, Moustakas, Leonidas A., Pasquali, Anna, di Serego Alighieri, Sperello, Vernet, Joel, Walsh, Jeremy R., Windhorst, Rogier, & Yan, Haojing 2007, Astronomical Journal Redshifts of Emission-Line Objects in the Hubble Ultra Deep Field
  3. Pirzkal, Norbert, Malhotra, Sangeeta, Rhoads, James E., & Xu, Chun 2006, ArXiv Astrophysics e-prints Optical to mid-IR observations of Lyman-alpha galaxies at redshift 5 in the HUDF: a young and low mass population
  4. Cohen, S. H., Ryan, R. E., Jr., Straughn, A. N., Hathi, N. P., Windhorst, R. A., Koekemoer, A. M., Pirzkal, N., Xu, C., Mobasher, B., Malhotra, S., Strolger, L.-G., & Rhoads, J. E. 2006, Astrophysical Journal Clues to Active Galactic Nucleus Growth from Optically Variable Objects in the Hubble Ultra Deep Field
  5. Pirzkal, N., Xu, C., Ferreras, I., Malhotra, S., Mobasher, B., Rhoads, J. E., Pasquali, A., Panagia, N., Koekemoer, A. M., Ferguson, H. C., & Gronwall, C. 2006, Astrophysical Journal Morphology and Evolution of Emission-Line Galaxies in the Hubble Ultra Deep Field
  6. Pasquali, A., Ferreras, I., Panagia, N., Daddi, E., Malhotra, S., Rhoads, J. E., Pirzkal, N., Windhorst, R. A., Koekemoer, A. M., Moustakas, L., Xu, C., & Gronwall, C. 2006, Astrophysical Journal The Structure and Star Formation History of Early-Type Galaxies in the Ultra Deep Field/GRAPES Survey
  7. An overdensity of galaxies at z=5.9 +/- 0.2 in the Ultra deep field confirmed using the ACS grism: Malhotra et al.  Submitted to the ApJ.
  8. Passively evolving early-type galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field: Daddi et al Submitted to the ApJ.
  9. A Redshift z=5.4 Lyman alpha Emitting Galaxy with Linear Morphology in the GRAPES/UDF Field, Rhoads et al. 2004 to appear in ApJ, astro-ph/0408031
  10. Stars in the Hubble Ultra Deep Field: Pirzkal et al. 2004, to appear in ApJ.
  11. Grism Spectroscopy of the Hubble Ultra Deep Field: Description and Data Reduction: Pirzkal et al. 2004, ApJS 154, 501-508

Large Area Lyman Alpha (LALA) Survey

  1. Finkelstein, Steven L., Rhoads, James E., Malhotra, Sangeeta, Pirzkal, Norbert, & Wang, Junxian 2007, Astrophysical Journal The Ages and Masses of Lyα Galaxies at z ~ 4.5
  2. Malhotra, Sangeeta & Rhoads, James E. 2006, Astrophysical Journal The Volume Fraction of Ionized Intergalactic Gas at Redshift z=6.5
  3. Wang, J. X., Malhotra, S., & Rhoads, J. E. 2005, Astrophysical Journal An Overdensity of Lyα Emitters at Redshift z~5.7 near the Hubble Ultra Deep Field
  4. Luminosity Functions of Lyman-alpha Emitters at Redshifts z=6.5 and z=5.7: Evidence against Reionization at z<=6.5 ApJ, 617, L5-8: Malhotra & Rhoads 2004.
  5. Dawson, Steve, Rhoads, James E., Malhotra, Sangeeta, Stern, Daniel, Dey, Arjun, Spinrad, Hyron, Jannuzi, Buell T., Wang, JunXian, & Landes, Emily 2004, Astrophysical Journal Spectroscopic Properties of the z ~ 4.5 Lyα Emitters
  6. Wang, J. X., Malhotra, S., Rhoads, J. E., & Norman, C. A. 2004, Astrophysical Journal Identifying High-Redshift Active Galactic Nuclei Using X-Ray Hardness
  7. Rhoads, James E., Xu, Chun, Dawson, Steve, Dey, Arjun, Malhotra, Sangeeta, Wang, JunXian, Jannuzi, Buell T., Spinrad, Hyron, & Stern, Daniel 2004, Astrophysical Journal A Luminous Lyman-alpha emitting Galaxy at Redshift z = 6.535: Discovery and Spectroscopic Confirmation
  8. Wang, J. X., Rhoads, J. E., Malhotra, S., Dawson, S., Stern, D., Dey, A., Heckman, T. M., Norman, C. A., & Spinrad, H. 2004, Astrophysical Journal X-Ray Nondetection of the Ly? Emitters at z~4.5
  9. Wang, J. X., Malhotra, S., Rhoads, J. E., Brown, M. J. I., Dey, A., Heckman, T. M., Jannuzi, B. T., Norman, C. A., Tiede, G. P., & Tozzi, P. 2004, Astronomical Journal The 172 ks Chandra Exposure of the LALA Bootes Field: X-Ray Source Catalog
  10. Malhotra, S., Wang, J. X., Rhoads, J. E., Heckman, T. M., & Norman, C. A. 2003, Astrophysical Journal No X-Ray-bright Type II Quasars among the Ly? Emitters
  11. Spectroscopic Confirmation of Three Redshift z~5.7 Ly? Emitters from the Large-Area Lyman Alpha Survey Rhoads, J. E., A. Dey, S. Malhotra, D. Stern, H. Spinrad, B. T. Jannuzi, S. Dawson, M. J. I. Brown, and E. Landes 2003, AJ 125, 1006-1013.
  12. Malhotra, Sangeeta & Rhoads, James E. 2002, Astrophysical Journal Large Equivalent Width Lyman-alpha line Emission at z=4.5: Young Galaxies in a Young Universe?
  13. Rhoads, James E. & Malhotra, Sangeeta 2001, Astrophysical Journal Lyman-alpha Emitters at Redshift z = 5.7
  14. Rhoads, James E., Malhotra, Sangeeta, Dey, Arjun, Stern, Daniel, Spinrad, Hyron, & Jannuzi, Buell T. 2000, Astrophysical Journal First Results from the Large-Area Lyman Alpha Survey