Chandra and Spitzer Imaging of the Infrared Cluster in NGC 2071 (2009)
Skinner, S. L., Sokal, K. R., Megeath, S. T., Guedel, M., Audard, M., Flaherty, K. M., ...
We present results of a sensitive Chandra X-ray observation and Spitzer mid-IR observations of the infrared cluster lying north of the NGC 2071 reflection nebula in the Orion B molecular cloud. We...
Gutermuth, R. A., Megeath, S. T., Myers, P. C., Allen, L. E., Pipher, J. L., Fazio, G. G.
We present a uniform mid-infrared imaging and photometric survey of 36 young, nearby, star-forming clusters and groups using {\it Spitzer} IRAC and MIPS. We have confidently identified and classified...
Spitzer/IRAC Limits to Planetary Companions of Fomalhaut and epsilon Eridani (2009)
Marengo, M., Stapelfeldt, K., Werner, M. W., Hora, J. L., Fazio, G. G., Schuster, M. T., ...
Fomalhaut and epsilon Eridani are two young, nearby stars that possess extended debris disks whose structures suggest the presence of perturbing planetary objects. With its high sensitivity and...
A VLT/NACO Study of Star Formation in the Massive Embedded Cluster RCW 38 (2009)
DeRose, K. L., Bourke, T. L., Gutermuth, R. A., Wolk, S. J., Megeath, S. T., Alves, J., ...
We present adaptive optics (AO) near-infrared (JHKs) observations of the deeply embedded massive cluster RCW 38 using NACO on the VLT. Narrowband AO observations centered at wavelengths of 1.28,...
A Spectroscopic Study of Young Stellar Objects in the Serpens Cloud Core and NGC 1333 (2009)
Winston, E., Megeath, S. T., Wolk, S. J., Hernandez, J., Gutermuth, R., Muzerolle, J., ...
We present spectral observations of 130 young stellar objects (YSOs) in the Serpens Cloud Core and NGC 1333 embedded clusters. The observations consist of near-IR spectra in the H and K-bands, from...
The L1617 and L1622 Cometary Clouds in Orion (2009)
Bo Reipurth, Bo Reipurth, S. T. Megeath, John Bally, J. Walawender
Abstract. The molecular cloud complex encompassing the cometary clouds L1617 and L1622 is located just outside of Barnard’s Loop in Orion. It lies to the northeast of the Orion Nebula Cluster at a...
Kinematics of the Orion Nebula Cluster: Velocity Substructure and Spectroscopic Binaries (2009)
Tobin, J. J., Hartmann, L., Furesz, G., Mateo, M., Megeath, S. T.
We present a kinematic study of the Orion Nebula Cluster based upon radial velocities measured by multi-fiber echelle spectroscopy at the 6.5 meter MMT and Magellan telescopes. Velocities are...
Detection of Star Formation in the Unusually Cold Giant Molecular Cloud G216 (2009)
Megeath, S. T., Allgaier, E., Young, E., Allen, T., Pipher, J. L., Wilson, T. L.
The giant molecular cloud G216-2.5, also known as Maddalena's cloud or the Maddalena-Thaddeus cloud, is distinguished by an unusual combination of high gas mass (1-6 x 10^5) solar masses, low kinetic...
Davis, C.J., Froebrich, D., Stanke, T., Megeath, S.T., Kumar, M.S.N., Adamson, A.J., ...
Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO). DOI: 10.1051/0004-6361:200811096
Davis, C. J., Froebrich, D., Stanke, T., Megeath, S. T., Kumar, M. S. N., Adamson, A., ...
We present wide-field near-IR images of Orion A. K and H2 1-0S(1) images of a contiguous 8 sqr degree region are compared to photometry from Spitzer and dust-continuum maps obtained with MAMBO and...
New Young Brown Dwarfs in the Orion Molecular Cloud 2/3 Region (2008)
Peterson, Dawn E., Megeath, S. T., Luhman, K. L., Pipher, J. L., Stauffer, J. R., ...
Forty new low-mass members with spectral types ranging from M4 to M9 have been confirmed in the Orion Molecular Cloud (OMC) 2/3 region. Through deep, I-, z'-, J-, H-, and K-band photometry of a 20'...
New Young Brown Dwarfs in the Orion Molecular Cloud 2/3 Region (2008)
Peterson, Dawn E., Megeath, S. T., Luhman, K. L., Pipher, J. L., Stauffer, J. R., Navascues, D. Barrado Y, ...
Forty new low mass members with spectral types ranging from M4-M9 have been confirmed in the Orion Molecular Cloud 2/3 region. Through deep, I, z', J, H, K photometry of a 20' x 20' field in OMC 2/3,...
The Disk Population of the Chamaeleon I Star-Forming Region (2008)
Luhman, K. L., Allen, L. E., Allen, P. R., Gutermuth, R. A., Hartmann, L., Mamajek, E. E., ...
We present a census of circumstellar disks in the Chamaeleon I star-forming region. Using the Infrared Array Camera and the Multiband Imaging Photometer onboard the Spitzer Space Telescope, we have...
Gutermuth, R. A., Bourke, T. L., Allen, L. E., Myers, P. C., Megeath, S. T., Matthews, B. C., ...
We report the discovery of a nearby, embedded cluster of young stellar objects, associated filamentary infrared dark cloud, and 4.5 μm shock emission knots from outflows detected in Spitzer IRAC...
ATCA 3mm observations of NGC6334I and I(N): dense cores, outflows and an UCHII region (2008)
Beuther, H., Walsh, A. J., Thorwirth, S., Zhang, Q., Hunter, T. R., Megeath, S. T., ...
Aims: Investigation of the dense gas, the outflows and the continuum emission from the massive twin cores NGC6334I and I(N) at high spatial resolution. Methods: We imaged the region with the...
The Formation of Distributed and Clustered Stars in Molecular Clouds (2008)
Megeath, S. T., Li, Zhi-Yun, Nordlund, Aake
During the last two decades, the focus of star formation research has shifted from understanding the collapse of a single dense core into a star to studying the formation hundreds to thousands of...
Millimeter interferometry of W3 IRS5: a trapezium in the making (2008)
Rodón, J. A., Beuther, H., Megeath, S. T.
Context: Although most young massive stars appear to be part of multiple systems, it is poorly understood how this multiplicity influences the formation of massive stars. The high-mass star-forming...
ATCA 3 mm observations of NGC 6334I and I(N): dense cores, outflows, and an UCH II region (2008)
Beuther, H., Walsh, A. J., Thorwirth, S., Zhang, Q., Hunter, T. R., Megeath, S. T., ...
Aims.We investigate the dense gas, the outflows, and the continuum emission from the massive twin cores NGC 6334I and I(N) at high spatial resolution. Methods: We imaged the region with the Australia...
Gutermuth, R. A., Bourke, T. L., Allen, L. E., Myers, P. C., Megeath, S. T., Matthews, B. C., ...
We report the discovery of a nearby, embedded cluster of young stellar objects, associated filamentary infrared dark cloud, and 4.5 micron shock emission knots from outflows detected in Spitzer/IRAC...
S. T. Megeath, J. Stauffer, J. Hora, G. Fazio, P. Berlind, M. Calkins
We describe an ongoing campaign to identify and characterize celestial standards for the Infrared Array Camera (IRAC) which will be deployed on the Space Infrared Telescope Facility (SIRTF). These...
S. T. Megeath, B. Biller, T. M. Dame, E. Leass, T. L. Wilson
Presentamos evidencia para la formacion estelar estimulada a dos escalas espaciales distintas en el complejo de nubes moleculares NGC 281. Este complejo notable se ubica 300 pc arriba del plano...
Revmexaa Serie De, S. T. Megeath
We present evidence for triggered star formation on two di#erent spatial scales in the NGC 281 molecular cloud complex. This remarkable complex is situated 300 pc above the Galactic plane, and...
Gutermuth, R. A., Myers, P. C., Megeath, S. T., Allen, L. E., Pipher, J. L., Muzerolle, J., ...
We present a comprehensive analysis of structure in the young, embedded cluster, NGC 1333 using members identified with Spitzer and 2MASS photometry based on their IR-excess emission. In total, 137...
A Combined Spitzer and Chandra Survey of Young Stellar Objects in the Serpens Cloud Core (2007)
Winston, E., Megeath, S. T., Wolk, S. J., Muzerolle, J., Gutermuth, R., Hora, J. L., ...
We present Spitzer and Chandra observations of the nearby (~260 pc) embedded stellar cluster in the Serpens Cloud Core. We observed, using Spitzer's IRAC and MIPS instruments, in six wavelength bands...
Cool Stars in Hot Places (2007)
Megeath, S. T., Gaidos, E., Hester, J. J., Adams, F. C., Bally, J., ...
During the last three decades, evidence has mounted that star and planet formation is not an isolated process, but is influenced by current and previous generations of stars. Although cool stars form...
Infrared Extinction Toward Nearby Star-Forming Regions (2007)
Flaherty, K. M., Pipher, J. L., Megeath, S. T., Winston, E. M., Gutermuth, R. A., Muzerolle, J., ...
We present an independent estimate of the interstellar extinction law for the Spitzer IRAC bands as well as a first attempt at extending the law to the 24micron MIPS band. The source data for these...
New Low-Mass Stars and Brown Dwarfs with Disks in Lupus (2007)
Allen, P. R., Luhman, K. L., Myers, P. C., Megeath, S. T., Allen, L. E., Hartmann, L., ...
Using the Infrared Array Camera and the Multiband Imaging Photometer aboard the {\it Spitzer Space Telescope}, we have obtained images of the Lupus 3 star-forming cloud at 3.6, 4.5, 5.8, 8.0, and 24...
Hot ammonia in NGC6334I & I(N) (2007)
Beuther, H., Walsh, A. J., Thorwirth, S., Zhang, Q., Hunter, T. R., Megeath, S. T., ...
Aims: The massive twin cores NGC6334I and I(N) are in different evolutionary stages and hence ideal targets to study evolutionary variations within the same larger-scale environment. Here, we study...
Hot ammonia in NGC 6334I & I(N) (2007)
Beuther, H., Walsh, A. J., Thorwirth, S., Zhang, Q., Hunter, T. R., Megeath, S. T., ...
Aims.The massive twin cores NGC 6334I and I(N) are in different evolutionary stages and hence ideal targets to study evolutionary variations within the same larger-scale environment. Here, we study...
Hot ammonia in NGC 63341 & I(N) (2007)
Beuther, H., Walsh, A.J., Thorwirth, S., Zhang, Q., Hunter, T.R., Megeath, S.T., ...
Aims. The massive twin cores NGC 6334I and I(N) are in different evolutionary stages and hence ideal targets to study evolutionary variations within the same larger-scale environment. Here, we study...
Discovery of Two T Dwarf Companions with the Spitzer Space Telescope (2006)
Luhman, K. L., Patten, B. M., Marengo, M., Schuster, M. T., Hora, J. L., Ellis, R. G., ...
We report the discovery of T dwarf companions to the nearby stars HN Peg (G0V, 18.4 pc, ~0.3 Gyr) and HD 3651 (K0V, 11.1 pc, ~7 Gyr). During an ongoing survey of 5'x5' fields surrounding stars in the...
Observational Evidence for Triggered Star Formation on Scales of 1 to 300 pc (2006)
S. T. Megeath, B. Biller, T. M. Dame, E. Leass, R. S. Whitaker, T. L. Wilson
Observational Evidence for Triggered Star Formation on Scales of 1 to 300 pc
A Sensitive Search for Variability in Late L Dwarfs: The Quest for Weather (2006)
Morales-Calderon, M., Stauffer, J. R., Kirkpatrick, J. Davy, Carey, S., Gelino, C. R., Navascues, D. Barrado Y, ...
We have conducted a photometric monitoring program of 3 field late-L brown dwarfs looking for evidence of non-axisymmetric structure or temporal variability in their photospheres. The observations...
A correlation between pre-main-sequence stellar rotation rates and IRAC excesses in Orion (2006)
Rebull, L. M., Stauffer, J. R., Megeath, S. T., Hora, J. L., Hartmann, L.
Early observations of T Tauri stars suggested that stars with evidence of circumstellar accretion disks rotated slower than stars without such evidence, but more recent results are not as clear....
{Millimeter Multiplicity in NGC 6334 I and I(N) (2006)
Hunter, T. R., Brogan, C. L., Megeath, S. T., Menten, K. M., Beuther, H., Thorwirth, S.
Using the Submillimeter Array (SMA), we have imaged the 1.3 millimeter continuum emission at the center of the massive star-forming regions NGC 6334 I and I(N). In both regions, the SMA observations...
A Spitzer/IRAC Search for Substellar Companions of the Debris Disk Star epsilon Eridani (2006)
Marengo, M., Megeath, S. T., Fazio, G. G., Stapelfeldt, K. R., Werner, M. W., Backman, D. E.
We have used the InfraRed Array Camera (IRAC) onboard the Spitzer Space telescope to search for low mass companions of the nearby debris disk star epsilon Eridani. The star was observed in two epochs...
A Correlation Between Pre-Main Sequence Stellar Rotation Rates and IRAC Excesses in Orion (2006)
Rebull, L. M., Stauffer, J. R., Megeath, S. T., Hora, J. L., Hartmann, L.
Early observations of T Tauri stars suggested that stars with evidence of circumstellar accretion disks rotated slower than stars without such evidence, but more recent results are not as clear....
The Structure and Evolution of Young Stellar Clusters (2006)
Allen, L., Megeath, S. T., Gutermuth, R., Myers, P. C., Wolk, S., Adams, F. C., ...
We examine the properties of embedded clusters within 1 kiloparsec using new data from the Spitzer Space Telescope, as well as recent results from 2MASS and other ground-based near-infrared surveys....
Disk evolution in Cep OB2: Results from the Spitzer Space Telescope (2006)
Sicilia-Aguilar, Aurora, Hartmann, Lee, Calvet, Nuria, Megeath, S. T., Muzerolle, James, Allen, Lori, ...
We present the results of an infrared imaging survey of two clusters in the Cep OB2 Association, Tr 37 and NGC 7160, using the IRAC and MIPS instruments on board the Spitzer Space Telescope. Our...
Millimeter multiplicity in NGC 6334 I and I(N) (2006)
Hunter, T. R., Brogan, C. L., Megeath, S. T., Menten, K. M., Beuther, H., Thorwirth, S.
Using the Submillimeter Array (SMA), we have imaged the 1.3 mm continuum emission at the centers of the massive star-forming regions NGC 6334 I and I(N). In both regions, the SMA observations resolve...
Discovery of a Planetary-Mass Brown Dwarf with a Circumstellar Disk (2005)
Luhman, K. L., Adame, Lucia, D'Alessio, Paola, Calvet, Nuria, Hartmann, Lee, Megeath, S. T., ...
Using the Hubble Space Telescope, the 4 m Blanco telescope at the Cerro Tololo Inter-American Observatory, and the Spitzer Space Telescope, we have performed deep imaging from 0.8 to 8 um of the...
Spitzer/IRAC Photometry of the Eta Chameleontis Association (2005)
Megeath, S. T., Hartmann, L., Luhman, K. L., Fazio, G. G.
We present IRAC 3.6, 4.5, 5.8 and 8 micron photometry for the 17 A, K and M type members of the Eta Chameleontis association. These data show infrared excesses toward six of the 15 K and M stars,...
The Disk Fractions of Brown Dwarfs in IC 348 and Chamaeleon I (2005)
Luhman, K. L., Lada, C. J., Hartmann, L., Muench, A. A., Megeath, S. T., Allen, L. E., ...
Using the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope, we have obtained mid-infrared photometry for 25 and 18 low-mass members of the IC 348 and Chamaeleon I star-forming...
A Spitzer/IRAC Survey of Massive Star-Forming Regions (2005)
Allen, L. E., Hora, J. L., Megeath, S. T., Deutsch, L. K., Fazio, G. G., Chavarria, L., ...
We are conducting a survey of several regions of high-mass star formation to assess their content and structure. The observations include Spitzer observations, ground-based optical and near-IR...
A Spitzer/IRAC Survey of the Orion Molecular Clouds (2005)
Megeath, S. T., Flaherty, K. M., Hora, J., Allen, L. E., Fazio, G. G., Hartmann, L., ...
We present initial results from a survey of the Orion A and B molecular clouds made with the InfraRed Array Camera (IRAC) onboard the Spitzer Space Telescope. This survey encompasses a total of 5.6...
Absolute Calibration of the Infrared Array Camera on the Spitzer Space Telescope (2005)
Reach, William T., Megeath, S. T., Cohen, Martin, Hora, J., Carey, Sean, Surace, Jason, ...
The Infrared Array Camera (IRAC) on the Spitzer Space Telescope is absolutely calibrated by comparing photometry on a set of A stars near the north ecliptic pole to predictions based on ground-based...
IRAC Observations of Taurus Pre-Main Sequence Stars (2005)
Hartmann, Lee, Megeath, S. T., Allen, Lori, Luhman, Kevin, Calvet, Nuria, D'Alessio, Paola, ...
We present infrared photometry obtained with the IRAC camera on the Spitzer Space Telescope of a sample of 82 pre-main sequence stars and brown dwarfs in the Taurus star-forming region. We find a...
Beuther, H., Thorwirth, S., Zhang, Q., Hunter, T. R., Megeath, S. T., Walsh, A. J., ...
Molecular line observations of NH3 (J,K)=(1,1), (2,2) and CH3OH at 24.93GHz taken with the Australian Telescope Compact Array (ATCA) toward the massive twin cores NGC6334 I & I(N) reveal significant...
The Vega Debris Disk -- A Surprise from Spitzer (2005)
Su, K. Y. L., Rieke, G. H., Misselt, K. A., Stansberry, J. A., Moro-Martin, A., Stapelfeldt, K. R., ...
We present high spatial resolution mid- and far-infrared images of the Vega debris disk obtained with the Multiband Imaging Photometer for Spitzer (MIPS). The disk is well resolved and its angular...
Hubble Space Telescope NICMOS Imaging of W3 IRS 5: A Trapezium in the Making? (2005)
Megeath, S. T., Wilson, T. L., Corbin, M.
We present Hubble Space Telescope NICMOS imaging of W3 IRS 5, a binary high-mass protostar. In addition to the two protostars, NICMOS images taken in the F222M and F160W filters show three new 2.22...
Spitzer Identification of the Least Massive Known Brown Dwarf with a Circumstellar Disk (2005)
Luhman, K. L., D'Alessio, Paola, Calvet, Nuria, Allen, Lori E., Hartmann, Lee, Megeath, S. T., ...
Using the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope, we have obtained mid-infrared photometry of the least massive known brown dwarf in the Chamaeleon I star-forming region. For...
The Outburst of V1647 Ori Revealed by Spitzer (2004)
Muzerolle, J., Megeath, S. T., Flaherty, K. M., Gordon, K. D., Rieke, G. H., Young, E. T., ...
We present Spitzer Space Telescope observations of V1647 Ori, the outbursting source lighting McNeil's nebula, taken near the optical peak of the outburst in early March 2004. The source is easily...
Spectroscopic Confirmation of the Least Massive Known Brown Dwarf in Chamaeleon (2004)
Luhman, K. L., Peterson, Dawn E., Megeath, S. T.
We present spectroscopy of two candidate substellar members of the Chamaeleon I star-forming region. The candidates, which were identified photometrically by Oasa, Tamura, & Sugitani, have been...
Gutermuth, R. A., Megeath, S. T., Pipher, J. L., Williams, J. P., Allen, L. E., Myers, P. C., ...
We present an analysis of K-band stellar distributions for the young stellar clusters GGD 12-15, IRAS 20050+2720, and NGC 7129. We find that the two deeply embedded clusters, GGD 12-15 and IRAS...
Disk evolution in the Ori OB1 association (2004)
Calvet, Nuria, Briceno, Cesar, Hernandez, Jesus, Hoyer, Sergio, Hartmann, Lee, Sicilia-Aguilar, Aurora, ...
We analyze multi-band photometry of a subsample of low mass stars in the associations Ori OB1a and 1b discovered during the CIDA Orion Variability Survey, which have ages of 7 - 10 Myr and 3 - 5 Myr,...
The 24-Micron View of Embedded Star Formation in NGC 7129 (2004)
Muzerolle, J., Megeath, S. T., Gutermuth, R. A., Allen, L. E., Pipher, J. L., Hartmann, L., ...
We present observations of the star formation region NGC 7129 taken with the Multiband Imaging Photometer for Spitzer (MIPS). A significant population of sources, likely pre-main sequence members of...
Initial Results from The Spitzer Young Stellar Cluster Survey (2004)
Megeath, S. T., Allen, L. E., Gutermuth, R. A., Pipher, J. L., Myers, P. C., Calvet, N., ...
We report initial results from IRAC observations of four young stellar clusters. These regions are part of a larger Spitzer survey of 31 young stellar groups and clusters within 1 kpc of the Sun. In...
High-Resolution Continuum Imaging at 1.3 and 0.7 cm of the W3 IRS 5 Region (2003)
Wilson, T. L., Boboltz, D. A., Gaume, R. A., Megeath, S. T.
High-resolution images of the hypercompact HII regions (HCHII) in W3 IRS 5 taken with the Very Large Array (VLA) at 1.3 and 0.7 cm are presented. Four HCHII regions were detected with sufficient...
Cohen, Martin, Megeath, S. T., Hammersley, Peter L., Martin-Luis, Fabiola, Stauffer, John
We describe the technique used to develop on-orbit calibrators for IRAC and validate the method for either K0-M0III or A0-A5V stars. For SIRTF, the approach uses all available optical, NIR, and MIR...
Spectral Irradiance Calibration in the Infrared. XIV: the Absolute Calibration of 2MASS (2003)
Cohen, Martin, Wheaton, Wm. A., Megeath, S. T.
Element-by-element we have combined the optical components in the three 2MASS cameras, and incorporated detector quantum efficiency curves and site-specific atmospheric transmissions, to create three...
Ridge, Naomi A., Wilson, T. L., Megeath, S. T., Allen, L. E., Myers, P. C.
As the first step of a multi-wavelength investigation into the relationship between young stellar clusters and their environment we present fully-sampled maps in the J=1--0 lines of 13CO and C18O and...
Ridge, N. A., Wilson, T. L., Megeath, S. T., Allen, L. E., Myers, P. C.
As the first step of a multiwavelength investigation into the relationship between young stellar clusters and their environment, we present fully sampled maps in the J = 1 - 0 lines of (CO)-C-13 and...
High-resolution continuum imaging at 1.3 and 0.7 centimeters of the W3IRS 5 region (2003)
Wilson, T. L., Boboltz, D. A., Gaume, R. A., Megeath, S. T.
High-resolution images of the hypercompact H II (HC H II) regions in W3 IRS 5 taken with the Very Large Array (VLA) at 1.3 and 0.7 cm are presented. Four HC H II regions were detected with sufficient...
Observational Evidence for Triggered Star Formation on Scales of 1 to 300 pc (2003)
Biller , B., Dame , T. M., Leass , E., Megeath , S. T., Whitaker , R. S., Wilson , T. L.
Ridge, Naomi A., Bergin, Edwin A., Megeath, S. T.
In order to obtain a census of the pre-stellar and star-forming molecular cores, we have begun an unbiased survey in CS and N2H+ of the L1630 and L1641 molecular clouds. The use of these two...
The impact of massive stars on the formation of young stellar clusters (2002)
Megeath, S. T., Biller, B., Dame, T. M., Leass, E., Whitaker, R. S., Wilson, T. L.
High-Mass Stars as Early Signpost of Cluster Formation (2001)
Tieftrunk, A. R., Megeath, S. T., Thorwirth, S.
The connection between high-mass stars and young stellar clusters has been well established by near-IR observations showing young massive stars in HII regions surrounded by clusters of lower mass...
The Impact of Massive Stars on the Formation of Young Stellar Clusters (2001)
Megeath, S. T., Biller, B., Dame, T. M., Leass, E., Whitaker, R. S., Wilson, T. L.
Massive OB stars play an important role in the evolution of molecular clouds and star forming regions. The OB stars both photo--ionize molecular gas as well as sweep up and compress interstellar gas...
The Detection of Outflows in the IR-Quiet Molecular Core NGC 6334 I(North) (1999)
Megeath, S. T., Tieftrunk, A. R.
We find strong evidence for outflows originating in the dense molecular core NGC 6334 I(North): a 1000 Msol molecular core distinguished by its lack of HII regions and mid-IR emission. New...
A thermal plume in NGC 2024 (1997)
Subrahmanyan, Ravi, Goss, W.M., Megeath, S.T., Peter, Barnes J.
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